Pub Date : 2021-01-31DOI: 10.7575/AIAC.IJKSS.V.9N.1P.24
Michael E. King, Samuel Miller, Reuben F. Burch, W. Reimann, John P. Shalala, A. Piroli, Cory Bichey, Ted Rath
Background: To gain a competitive advantage in National Collegiate Athletic Association (NCAA) Division 1 American college football, teams often use a coded, hand/body gesture-based play-calling system to communicate calls to student-athletes on the field. Objective: The purpose of this study is to apply cognitive engineering concepts toward the improvement of signal transmission such that a realistic amount of data signaled will be received and understood by the student-athlete. Methods: Partnering with an NCAA coaching staff, information transmitted via signal-based communication pathways were quantified to inform the design of their signal system. Quality control coaches, practitioners of football signalling characterization and design, used an autoethnographic frame to train researchers on the communication protocol standards. A comprehensive literature review of sources from 1900 to 2019 was conducted to examine information transmission, signal-gesture taxonomies, sign-language recognition, and code design. Findings were applied to the signal system to quantify the information contained in the transmission between the signalling coaches and the student-athletes. Results: Results found that the observed signal system transmits an average of 12.62 bits of information on offense and 12.92 bits on defense with 23% and 12% redundancy, respectively. Conclusion: Recommendations were provided to the coaching staff regarding code optimization and gesture design to improve student-athlete performance.
{"title":"Quantification of Information Transmission in Signal Play-calling for NCAA Division 1 College Football: A Comprehensive Literature Review","authors":"Michael E. King, Samuel Miller, Reuben F. Burch, W. Reimann, John P. Shalala, A. Piroli, Cory Bichey, Ted Rath","doi":"10.7575/AIAC.IJKSS.V.9N.1P.24","DOIUrl":"https://doi.org/10.7575/AIAC.IJKSS.V.9N.1P.24","url":null,"abstract":"Background: To gain a competitive advantage in National Collegiate Athletic Association (NCAA) Division 1 American college football, teams often use a coded, hand/body gesture-based play-calling system to communicate calls to student-athletes on the field. Objective: The purpose of this study is to apply cognitive engineering concepts toward the improvement of signal transmission such that a realistic amount of data signaled will be received and understood by the student-athlete. Methods: Partnering with an NCAA coaching staff, information transmitted via signal-based communication pathways were quantified to inform the design of their signal system. Quality control coaches, practitioners of football signalling characterization and design, used an autoethnographic frame to train researchers on the communication protocol standards. A comprehensive literature review of sources from 1900 to 2019 was conducted to examine information transmission, signal-gesture taxonomies, sign-language recognition, and code design. Findings were applied to the signal system to quantify the information contained in the transmission between the signalling coaches and the student-athletes. Results: Results found that the observed signal system transmits an average of 12.62 bits of information on offense and 12.92 bits on defense with 23% and 12% redundancy, respectively. Conclusion: Recommendations were provided to the coaching staff regarding code optimization and gesture design to improve student-athlete performance.","PeriodicalId":36327,"journal":{"name":"International Journal of Kinesiology and Sports Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43238223","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-30DOI: 10.7575/AIAC.IJKSS.V.9N.1P.15
Anneke I Winegarden, C. Lebrun, L. Passfield, P. Doyle-Baker
Background: Limited research surrounding sex differences in fatigue and performance after high intensity interval training (HIIT) exists in the field setting. While lab-based protocols provide a controlled environment, physiological mechanisms of fatigue and performance response in competitive athletes are best measured by time-trial (TT). Few studies, however, have investigated fatigue in TT performance while controlling for the menstrual cycle (MC). Objective: The study investigated the influence of sex and MC phase on 3km track TT performance after a HIIT session in Competitive Cross Country (XC) skiers. Methods: A quasi-experimental design was employed and athletes over the age of 16 years (30F, 9M), were recruited from across Canada and completed 3 days of testing/training: a 3km track TT on Day 1 and Day 3; and a HIIT session (4-8x, 800m) on Day 2. MC phase was verified by ovulation testing and salivary hormone samples; athletes were classified as either “Low Hormone” or “High Hormone” for analysis. Results: An overall improvement in performance from pre- to post-HIIT TTs occurred (p<0.01). No significant differences in TT performance after HIIT were observed between sexes (p=0.16) or MC phase (p=0.26). Conclusion: These results indicate that competitive XC skiers will likely experience an improvement in TT performance after a bout of HIIT. Coaches and athletes should plan their workouts prior to testing accordingly to maximize TT performance. These results also suggest that no special adjustments need to be considered for differences in performance after HIIT between sexes and MC phase, although further studies with a greater sample size and repeated testing are warranted.
{"title":"Three km Track Time Trial Performance Changes after HIIT in Competitive Cross-Country Skiers","authors":"Anneke I Winegarden, C. Lebrun, L. Passfield, P. Doyle-Baker","doi":"10.7575/AIAC.IJKSS.V.9N.1P.15","DOIUrl":"https://doi.org/10.7575/AIAC.IJKSS.V.9N.1P.15","url":null,"abstract":"Background: Limited research surrounding sex differences in fatigue and performance after high intensity interval training (HIIT) exists in the field setting. While lab-based protocols provide a controlled environment, physiological mechanisms of fatigue and performance response in competitive athletes are best measured by time-trial (TT). Few studies, however, have investigated fatigue in TT performance while controlling for the menstrual cycle (MC). Objective: The study investigated the influence of sex and MC phase on 3km track TT performance after a HIIT session in Competitive Cross Country (XC) skiers. Methods: A quasi-experimental design was employed and athletes over the age of 16 years (30F, 9M), were recruited from across Canada and completed 3 days of testing/training: a 3km track TT on Day 1 and Day 3; and a HIIT session (4-8x, 800m) on Day 2. MC phase was verified by ovulation testing and salivary hormone samples; athletes were classified as either “Low Hormone” or “High Hormone” for analysis. Results: An overall improvement in performance from pre- to post-HIIT TTs occurred (p<0.01). No significant differences in TT performance after HIIT were observed between sexes (p=0.16) or MC phase (p=0.26). Conclusion: These results indicate that competitive XC skiers will likely experience an improvement in TT performance after a bout of HIIT. Coaches and athletes should plan their workouts prior to testing accordingly to maximize TT performance. These results also suggest that no special adjustments need to be considered for differences in performance after HIIT between sexes and MC phase, although further studies with a greater sample size and repeated testing are warranted.","PeriodicalId":36327,"journal":{"name":"International Journal of Kinesiology and Sports Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45535359","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-29DOI: 10.7575/AIAC.IJKSS.V.9N.1P.45
Brett A. Morvant, Elizabeth C Heintz, Jeremy J. Foreman
Background: Long-distance travel is common for professional athletes; thus, the impact of jet-lag on athletic performance is a relevant topic. Additionally, older individuals take longer to recover from exercise and post-travel fatigue; therefore, it is likely that age and travel affect performance. Objective: The purpose of this study is to investigate the effects of age and travel on NFL quarterback performance. Method: A correlational research design is used to examine the effects of age and travel on NFL quarterback performance. Data were collected from pro-football-reference.com. Quarterback ratings from the 2018 NFL season are analyzed with age, distance traveled, season week, and weeks since the team’s bye week. The interaction of age and distance is also included to examine the impact of the age-distance relationship on performance. Regression analysis is used to predict quarterback ratings. Results: Season week (p = 0.04), weeks since a bye week (p = 0.041), and distance traveled (p = 0.031) have negative effects on quarterback ratings. The age-performance relationship in NFL quarterbacks is non-linear (p = 0.018), with quarterback performance decreasing during an athlete’s 20s and then increasing during an athlete’s 30s. Additionally, ratings of younger quarterbacks decrease with farther distances traveled, while the ratings of older quarterbacks increase with farther distances traveled (p = 0.072). Conclusions: Differences in performance by age with travel may be the result of different severities of jet-lag symptoms experienced by younger and older quarterbacks, as well differences in strategies for managing post-travel fatigue by athletes of different ages.
{"title":"Effects of Age and Travel on National Football League Quarterback Performance: A Correlational Study","authors":"Brett A. Morvant, Elizabeth C Heintz, Jeremy J. Foreman","doi":"10.7575/AIAC.IJKSS.V.9N.1P.45","DOIUrl":"https://doi.org/10.7575/AIAC.IJKSS.V.9N.1P.45","url":null,"abstract":"Background: Long-distance travel is common for professional athletes; thus, the impact of jet-lag on athletic performance is a relevant topic. Additionally, older individuals take longer to recover from exercise and post-travel fatigue; therefore, it is likely that age and travel affect performance. Objective: The purpose of this study is to investigate the effects of age and travel on NFL quarterback performance. Method: A correlational research design is used to examine the effects of age and travel on NFL quarterback performance. Data were collected from pro-football-reference.com. Quarterback ratings from the 2018 NFL season are analyzed with age, distance traveled, season week, and weeks since the team’s bye week. The interaction of age and distance is also included to examine the impact of the age-distance relationship on performance. Regression analysis is used to predict quarterback ratings. Results: Season week (p = 0.04), weeks since a bye week (p = 0.041), and distance traveled (p = 0.031) have negative effects on quarterback ratings. The age-performance relationship in NFL quarterbacks is non-linear (p = 0.018), with quarterback performance decreasing during an athlete’s 20s and then increasing during an athlete’s 30s. Additionally, ratings of younger quarterbacks decrease with farther distances traveled, while the ratings of older quarterbacks increase with farther distances traveled (p = 0.072). Conclusions: Differences in performance by age with travel may be the result of different severities of jet-lag symptoms experienced by younger and older quarterbacks, as well differences in strategies for managing post-travel fatigue by athletes of different ages.","PeriodicalId":36327,"journal":{"name":"International Journal of Kinesiology and Sports Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44935090","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-10-31DOI: 10.7575/aiac.ijkss.v.8n.4p.34
K. M. Sebastian, Reuben F. Burch, Preston “Stick” Rogers
Background: Over 2.7 million people suffer traumatic brain injuries (TBIs) annually in the United States. TBI involves the application and generation of external forces and impulse loads respectively to the head whereby the brain moves relative to the skull. Despite numerous studies, further understanding of TBIs is necessary, requiring consistent attention. Objective: The purpose of this article is to investigate the history of American football helmets and provide an academic and practitioner review as it relates to TBIs. This study is a literature review that also considers perspectives from an autoethnographic frame. Method: An extensive literature review was performed to assess the history of TBI as it relates to American football. This article evaluates helmet design optimization and American football safety as well as an exploration into the sports’ education methods for players and staff alike. Results: Despite developing helmet designs that can better attenuate impact forces, reducing linear and rotational movement, the skull and brain move very differently relative to one another. Helmet designs and tools for measuring forces require further validation techniques to determine resultant forces and movement for the brain. Current biomechanics research lacks sufficient methodology for defining TBI thresholds, making helmet optimization difficult. Conclusion: According to past research, no helmet can eliminate all TBI risk; however, processes are in place lead by the National Football League (NFL) and NFL Players Association to educate players, coaches, and staff at all levels of competition of the protective capabilities of available helmet options.
{"title":"Brain Injuries in American Football: Understanding the Injury, Difficulty in Helmet Optimization, and Current Communication Practices – A Narrative Review","authors":"K. M. Sebastian, Reuben F. Burch, Preston “Stick” Rogers","doi":"10.7575/aiac.ijkss.v.8n.4p.34","DOIUrl":"https://doi.org/10.7575/aiac.ijkss.v.8n.4p.34","url":null,"abstract":"Background: Over 2.7 million people suffer traumatic brain injuries (TBIs) annually in the United States. TBI involves the application and generation of external forces and impulse loads respectively to the head whereby the brain moves relative to the skull. Despite numerous studies, further understanding of TBIs is necessary, requiring consistent attention. Objective: The purpose of this article is to investigate the history of American football helmets and provide an academic and practitioner review as it relates to TBIs. This study is a literature review that also considers perspectives from an autoethnographic frame. Method: An extensive literature review was performed to assess the history of TBI as it relates to American football. This article evaluates helmet design optimization and American football safety as well as an exploration into the sports’ education methods for players and staff alike. Results: Despite developing helmet designs that can better attenuate impact forces, reducing linear and rotational movement, the skull and brain move very differently relative to one another. Helmet designs and tools for measuring forces require further validation techniques to determine resultant forces and movement for the brain. Current biomechanics research lacks sufficient methodology for defining TBI thresholds, making helmet optimization difficult. Conclusion: According to past research, no helmet can eliminate all TBI risk; however, processes are in place lead by the National Football League (NFL) and NFL Players Association to educate players, coaches, and staff at all levels of competition of the protective capabilities of available helmet options.","PeriodicalId":36327,"journal":{"name":"International Journal of Kinesiology and Sports Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43124325","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-10-31DOI: 10.7575/aiac.ijkss.v.8n.4p.59
K. Carlson, Kayla Tweedt, Miranda Strelecki, Ian Malaby, Collin Seymour
Background: As shoulder care continues to be a concern for youth baseball players, coaches, parents, researchers and clinicians, shoulder complex care should remain a point of emphasis especially for in overhead athletes. The impact of throwing volume and shoulder care is important for us to understand. Objective: The purpose was to examine the changes in shoulder complex function during a playing season combined with shoulder complex training in young male baseball players. Methods: Eleven male baseball players (11-15 y/o) served as subjects. Pre-testing included shoulder joint internal/external rotation peak torque and average work as measured with isokinetic dynamometry (Biodex System 4Pro). Training over the 18-week project duration was Crossover Symmetry “Activation” and “Strength” protocols completed per manufacturer recommendations. Adherence was tracked via a weekly email sent to the subject’s guardian to self-report completed training. Post-testing was conducted at the conclusion of the 18th week. Paired sample t-tests compared pre-test and post-test mean differences for peak torque and average power (p<0.05). Results: All-subject average for training was 54 sessions over the 18 weeks. Estimated number of throws completed during practice and games over the 18 weeks was 8,400. For both testing speeds and for both internal and external shoulder joint rotation, peak torque increases ranged from ~50% for external rotation at 60 deg/s up to ~200% for internal rotation at 120 deg/s. Statistical differences (p<0.001) were noted between all pre-test and post-test internal and external rotation peak torque values. For both testing speeds and for both internal and external shoulder joint rotation, average power increases ranged from ~38% at 60 deg/s for external rotation up to ~200% at 120 deg/s for internal rotation. Statistical differences (p<0.005) were noted between all pre-test and post-test internal and external rotation average power values. Conclusions: Substantial increases in shoulder joint rotation peak torques and power were seen across the 18-week study duration. As this was a preliminary investigation, we have yet to discern if these increases are due to the shoulder complex training or volume of throwing that was completed.
背景：由于肩部护理仍然是青少年棒球运动员、教练、家长、研究人员和临床医生关注的问题，肩部综合护理仍然应该是一个重点，尤其是对头顶运动员来说。投掷量和肩部护理的影响对我们来说很重要。目的：观察青年男子棒球运动员肩关节复合体训练前后肩关节复合体功能的变化。方法：11名男性棒球运动员（11～15岁）作为研究对象。预测试包括用等速测功仪（Biodex System 4Pro）测量的肩关节内/外旋转峰值扭矩和平均功。在为期18周的项目期间，按照制造商的建议完成了Crossover Symmetry“Activation”和“Strength”协议的培训。通过每周发送给受试者监护人的电子邮件跟踪依从性，以自我报告完成的培训。在第18周结束时进行了后期测试。配对样本t检验比较了测试前和测试后峰值扭矩和平均功率的平均差异（p<0.05）。结果：所有受试者在18周内的平均训练次数为54次。据估计，在18周的训练和比赛中完成的投球次数为8400次。对于两种测试速度以及内外肩关节旋转，峰值扭矩增加范围从60°/s的外旋转约50%到120°/s的内旋转约200%。所有试验前和试验后内外旋转峰值扭矩值之间存在统计学差异（p＜0.001）。对于两种测试速度以及内外肩关节旋转，平均功率增加范围从60度/秒时的约38%（外旋转）到120度/秒下的约200%（内旋转）。所有试验前和试验后内外旋转平均功率值之间存在统计学差异（p＜0.005）。结论：在18周的研究期间，肩关节旋转峰值扭矩和功率显著增加。由于这是一项初步调查，我们尚未确定这些增加是由于肩部复杂训练还是完成的投掷量。
{"title":"A Preliminary Examination of Shoulder Joint Function Following Shoulder Complex Training and In-Season Play in Youth Baseball Players","authors":"K. Carlson, Kayla Tweedt, Miranda Strelecki, Ian Malaby, Collin Seymour","doi":"10.7575/aiac.ijkss.v.8n.4p.59","DOIUrl":"https://doi.org/10.7575/aiac.ijkss.v.8n.4p.59","url":null,"abstract":"Background: As shoulder care continues to be a concern for youth baseball players, coaches, parents, researchers and clinicians, shoulder complex care should remain a point of emphasis especially for in overhead athletes. The impact of throwing volume and shoulder care is important for us to understand. Objective: The purpose was to examine the changes in shoulder complex function during a playing season combined with shoulder complex training in young male baseball players. Methods: Eleven male baseball players (11-15 y/o) served as subjects. Pre-testing included shoulder joint internal/external rotation peak torque and average work as measured with isokinetic dynamometry (Biodex System 4Pro). Training over the 18-week project duration was Crossover Symmetry “Activation” and “Strength” protocols completed per manufacturer recommendations. Adherence was tracked via a weekly email sent to the subject’s guardian to self-report completed training. Post-testing was conducted at the conclusion of the 18th week. Paired sample t-tests compared pre-test and post-test mean differences for peak torque and average power (p<0.05). Results: All-subject average for training was 54 sessions over the 18 weeks. Estimated number of throws completed during practice and games over the 18 weeks was 8,400. For both testing speeds and for both internal and external shoulder joint rotation, peak torque increases ranged from ~50% for external rotation at 60 deg/s up to ~200% for internal rotation at 120 deg/s. Statistical differences (p<0.001) were noted between all pre-test and post-test internal and external rotation peak torque values. For both testing speeds and for both internal and external shoulder joint rotation, average power increases ranged from ~38% at 60 deg/s for external rotation up to ~200% at 120 deg/s for internal rotation. Statistical differences (p<0.005) were noted between all pre-test and post-test internal and external rotation average power values. Conclusions: Substantial increases in shoulder joint rotation peak torques and power were seen across the 18-week study duration. As this was a preliminary investigation, we have yet to discern if these increases are due to the shoulder complex training or volume of throwing that was completed.","PeriodicalId":36327,"journal":{"name":"International Journal of Kinesiology and Sports Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44125049","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-10-31DOI: 10.7575/aiac.ijkss.v.8n.4p.25
Tyler J. Neltner, J. V. Anders, Joshua L. Keller, Robert W. Smith, T. Housh, Richard Schmidt, G. Johnson
Background: Few studies have compared performance fatigability (PF) for bilateral versus unilateral isokinetic tasks. Objectives: The purpose of this study was to examine: Mode-specific testing responses to isokinetic fatigue, differences in PF between bilateral and unilateral leg extensions, and the effects of fatiguing, unilateral, dynamic leg extensions on contralateral isokinetic peak torque (PT) and maximal voluntary isometric contraction (MVIC). Methods: Eight men (mean ± SD: age= 22.5 ± 2.5 yr.) completed pre- and post-testing for PT and MVIC following 50 bilateral, unilateral right or left leg maximal, isokinetic leg extensions at 180°·s-1, on three separate days. Fatigue-induced decreases in PT and MVIC were used to quantify PF. The data were analyzed with a 4-way repeated measures ANOVA, follow up, and post-hoc analyses. Results: The results indicated that there were no differences (p > 0.05) in PF for the bilateral versus unilateral fatiguing tasks, decreases in PT (p < 0.001 - 0.016; d = 0.54 - 2.58) and MVIC (p < 0.001 - 0.006; η2p = 0.682 - 0.962) for the exercised legs during unilateral fatigue, and a contralateral increase (p = 0.007) in PT following the right leg fatiguing task. Conclusion: The results indicated that PT was more sensitive to fatiguing isokinetic tasks than was MVIC. In addition, there was a facilitation of PT in the contralateral leg following unilateral right leg fatigue. The differences in PT and MVIC testing may be attributable to the timing and/or relative contributions of peripheral and central fatigue.
{"title":"Ipsilateral and Contralateral Torque Responses to Bilateral and Unilateral Maximal, Fatiguing, Isokinetic Leg Extensions","authors":"Tyler J. Neltner, J. V. Anders, Joshua L. Keller, Robert W. Smith, T. Housh, Richard Schmidt, G. Johnson","doi":"10.7575/aiac.ijkss.v.8n.4p.25","DOIUrl":"https://doi.org/10.7575/aiac.ijkss.v.8n.4p.25","url":null,"abstract":"Background: Few studies have compared performance fatigability (PF) for bilateral versus unilateral isokinetic tasks. Objectives: The purpose of this study was to examine: Mode-specific testing responses to isokinetic fatigue, differences in PF between bilateral and unilateral leg extensions, and the effects of fatiguing, unilateral, dynamic leg extensions on contralateral isokinetic peak torque (PT) and maximal voluntary isometric contraction (MVIC). Methods: Eight men (mean ± SD: age= 22.5 ± 2.5 yr.) completed pre- and post-testing for PT and MVIC following 50 bilateral, unilateral right or left leg maximal, isokinetic leg extensions at 180°·s-1, on three separate days. Fatigue-induced decreases in PT and MVIC were used to quantify PF. The data were analyzed with a 4-way repeated measures ANOVA, follow up, and post-hoc analyses. Results: The results indicated that there were no differences (p > 0.05) in PF for the bilateral versus unilateral fatiguing tasks, decreases in PT (p < 0.001 - 0.016; d = 0.54 - 2.58) and MVIC (p < 0.001 - 0.006; η2p = 0.682 - 0.962) for the exercised legs during unilateral fatigue, and a contralateral increase (p = 0.007) in PT following the right leg fatiguing task. Conclusion: The results indicated that PT was more sensitive to fatiguing isokinetic tasks than was MVIC. In addition, there was a facilitation of PT in the contralateral leg following unilateral right leg fatigue. The differences in PT and MVIC testing may be attributable to the timing and/or relative contributions of peripheral and central fatigue.","PeriodicalId":36327,"journal":{"name":"International Journal of Kinesiology and Sports Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43397674","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-07-31DOI: 10.7575/aiac.ijkss.v.8n.3p.58
Jessica A. Mutchler, Klarie Macias, B. Munkasy, Samuel J Wilson, John C. Garner, Li Li
Background: Patellofemoral pain (PFP) is a common overuse injury that has been suggested to cause abnormal gait kinematics and variability in runners with PFP. Conflicting results have been presented as to the variability of joint kinematics and joint coordination. Objective: The purpose of this study was to examine the variability of lower extremity kinematics and joint coordination in the presence of PFP and exertion. Methods: Six female runners with PFP and matched controls (CON) ran at a self-selected pace on an instrumented treadmill until exertion or pain criteria was met. Sixteen anatomical retroreflective markers and seven tracking clusters were placed on the participants’ lower extremities. Data collected for 20 steps from the beginning, middle, and end of the run were processed. Kinematic variability was assessed for each participant by calculating the standard deviation (SD) of peak knee flexion, internal rotation, and adduction angle and their velocities. Continuous relative phase (CRP) mean values were calculated from normalized phase plots for coordination relationships between knee horizontal plane motion and hip sagittal, frontal, and horizontal and ankle frontal plane motion. Coordination variability was calculated as the CRP coupling SD over 100% of stance for each time point for each participant. Statistical comparisons were assessed through a 2 (PFP vs. CON) x 3 (beginning, middle, end) repeated measures ANOVA. Results: There was an increase in variability for peak knee adduction angle, peak knee adduction velocity, hip flexion/knee rotation CRP, and knee rotation/rearfoot eversion CRP over time for the PFP group compared with CON (P<0.05). Conclusion: Pain and exertion increase the variability of joint kinematics and joint coordination reflecting decreased movement control towards the end of a run.
{"title":"Kinematic and Coordination Variability in Runners with and Without Patellofemoral Pain","authors":"Jessica A. Mutchler, Klarie Macias, B. Munkasy, Samuel J Wilson, John C. Garner, Li Li","doi":"10.7575/aiac.ijkss.v.8n.3p.58","DOIUrl":"https://doi.org/10.7575/aiac.ijkss.v.8n.3p.58","url":null,"abstract":"Background: Patellofemoral pain (PFP) is a common overuse injury that has been suggested to cause abnormal gait kinematics and variability in runners with PFP. Conflicting results have been presented as to the variability of joint kinematics and joint coordination. Objective: The purpose of this study was to examine the variability of lower extremity kinematics and joint coordination in the presence of PFP and exertion. Methods: Six female runners with PFP and matched controls (CON) ran at a self-selected pace on an instrumented treadmill until exertion or pain criteria was met. Sixteen anatomical retroreflective markers and seven tracking clusters were placed on the participants’ lower extremities. Data collected for 20 steps from the beginning, middle, and end of the run were processed. Kinematic variability was assessed for each participant by calculating the standard deviation (SD) of peak knee flexion, internal rotation, and adduction angle and their velocities. Continuous relative phase (CRP) mean values were calculated from normalized phase plots for coordination relationships between knee horizontal plane motion and hip sagittal, frontal, and horizontal and ankle frontal plane motion. Coordination variability was calculated as the CRP coupling SD over 100% of stance for each time point for each participant. Statistical comparisons were assessed through a 2 (PFP vs. CON) x 3 (beginning, middle, end) repeated measures ANOVA. Results: There was an increase in variability for peak knee adduction angle, peak knee adduction velocity, hip flexion/knee rotation CRP, and knee rotation/rearfoot eversion CRP over time for the PFP group compared with CON (P<0.05). Conclusion: Pain and exertion increase the variability of joint kinematics and joint coordination reflecting decreased movement control towards the end of a run.","PeriodicalId":36327,"journal":{"name":"International Journal of Kinesiology and Sports Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46054275","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-07-31DOI: 10.7575/aiac.ijkss.v.8n.3p.1
C. Brown, A. Holland, Jaclyn Delarosa, Matthew Doude, Reuben F. Burch, W. Reimann, Ted Rath, A. Piroli
Background: The huddle in American college football has been replaced by hand-signals, play-cards, and other forms of nonverbal communication to deliver information from the sidelines to the field. These communication methods serve a dual-purpose of capturing the student-athletes’ attention while perplexing the opposition. Objective: The purpose of this study is to apply cognitive engineering concepts toward the improvement of signage and play-calling such that coaches can more effectively transmit information to players on the field during competitions. Methods: This comprehensive literature review investigates strategies for successful visual play-calling systems in sports communication. Collaboration occurred with a National Collegiate Athletic Association (NCAA) Division 1 football coaching staff to understand communication processes on field. Existing literature related to visual language processing, selective attention, and signal comprehension were compiled for recommendations. Results: Research findings suggest positive correlations between speed, clarity, and simplicity of signage in addition to effective sideline communication. The results of this review can be used to develop guidelines that increase the accuracy and speed of play-calling during games, such as clearly designed imagery and simplified play calls; coaches may establish strategies that are consistently understood by student-athletes. Conclusion: In addition to the findings, this study also identifies visual communication methods and mediums that can be used in any sport or work field where transmitting and comprehending information from a distance is critical for task completion.
{"title":"Comprehension and Selective Visual Attention in Play-calling Signage in NCAA Division 1 Football: A Comprehensive Literature Review","authors":"C. Brown, A. Holland, Jaclyn Delarosa, Matthew Doude, Reuben F. Burch, W. Reimann, Ted Rath, A. Piroli","doi":"10.7575/aiac.ijkss.v.8n.3p.1","DOIUrl":"https://doi.org/10.7575/aiac.ijkss.v.8n.3p.1","url":null,"abstract":"Background: The huddle in American college football has been replaced by hand-signals, play-cards, and other forms of nonverbal communication to deliver information from the sidelines to the field. These communication methods serve a dual-purpose of capturing the student-athletes’ attention while perplexing the opposition. Objective: The purpose of this study is to apply cognitive engineering concepts toward the improvement of signage and play-calling such that coaches can more effectively transmit information to players on the field during competitions. Methods: This comprehensive literature review investigates strategies for successful visual play-calling systems in sports communication. Collaboration occurred with a National Collegiate Athletic Association (NCAA) Division 1 football coaching staff to understand communication processes on field. Existing literature related to visual language processing, selective attention, and signal comprehension were compiled for recommendations. Results: Research findings suggest positive correlations between speed, clarity, and simplicity of signage in addition to effective sideline communication. The results of this review can be used to develop guidelines that increase the accuracy and speed of play-calling during games, such as clearly designed imagery and simplified play calls; coaches may establish strategies that are consistently understood by student-athletes. Conclusion: In addition to the findings, this study also identifies visual communication methods and mediums that can be used in any sport or work field where transmitting and comprehending information from a distance is critical for task completion.","PeriodicalId":36327,"journal":{"name":"International Journal of Kinesiology and Sports Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41832126","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-07-31DOI: 10.7575/aiac.ijkss.v.8n.3p.36
Mhk Irene L. Muir, K. Munroe-Chandler, T. Loughead, C. Sutherland, Kieran Hawksley
Background: The predominance of mental health concerns among post-secondary students has amplified the demand for campus counselling services. Although exercise is positively linked to mental health, campus interventions that integrate supervised exercise and exercise counselling are limited. Objectives: The purpose of the present study was to examine the impact of the UWorkItOut UWin program on students’ psychological distress. Methods: The UWorkItOut UWin program is a 6-week exercise training and counselling intervention offered to low risk, sedentary students seeking counselling services at a mid-sized Canadian University. The participants included 49 (male, n = 16; female, n = 32; gender invariant, n = 1) university students (71% undergraduate) with a mean age of 23.08 years (SD = 4.97). Students completed one unsupervised (60 minutes) and two supervised (45 mins each) exercise training sessions per week. Students also attended weekly individual exercise counselling sessions (30 minutes each). The Mental Health Inventory-38 (MHI-38) was used to measure changes in the three subscales of psychological distress: 1) anxiety, 2) depression, and 3) loss of emotional control. Results: Paired samples t tests demonstrated significant decreases in anxiety and depression scores from pre-to post-intervention (ps .05). Conclusion: The findings provide evidence for the effect of exercise in reducing university students’ psychological distress. Consequently, exercise is an additional mental health service for this population, alleviating strain on campus counselling services.
{"title":"The UWorkItOut UWin Program: Improving University Students’ Psychological Distress through Physical Activity","authors":"Mhk Irene L. Muir, K. Munroe-Chandler, T. Loughead, C. Sutherland, Kieran Hawksley","doi":"10.7575/aiac.ijkss.v.8n.3p.36","DOIUrl":"https://doi.org/10.7575/aiac.ijkss.v.8n.3p.36","url":null,"abstract":"Background: The predominance of mental health concerns among post-secondary students has amplified the demand for campus counselling services. Although exercise is positively linked to mental health, campus interventions that integrate supervised exercise and exercise counselling are limited. Objectives: The purpose of the present study was to examine the impact of the UWorkItOut UWin program on students’ psychological distress. Methods: The UWorkItOut UWin program is a 6-week exercise training and counselling intervention offered to low risk, sedentary students seeking counselling services at a mid-sized Canadian University. The participants included 49 (male, n = 16; female, n = 32; gender invariant, n = 1) university students (71% undergraduate) with a mean age of 23.08 years (SD = 4.97). Students completed one unsupervised (60 minutes) and two supervised (45 mins each) exercise training sessions per week. Students also attended weekly individual exercise counselling sessions (30 minutes each). The Mental Health Inventory-38 (MHI-38) was used to measure changes in the three subscales of psychological distress: 1) anxiety, 2) depression, and 3) loss of emotional control. Results: Paired samples t tests demonstrated significant decreases in anxiety and depression scores from pre-to post-intervention (ps .05). Conclusion: The findings provide evidence for the effect of exercise in reducing university students’ psychological distress. Consequently, exercise is an additional mental health service for this population, alleviating strain on campus counselling services.","PeriodicalId":36327,"journal":{"name":"International Journal of Kinesiology and Sports Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49192528","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-07-31DOI: 10.7575/aiac.ijkss.v.8n.3p.45
Tony Luczak, Reuben F. Burch, Brian K. Smith, J. Lamberth, Daniel W. Carruth, Collin Crane, Marci Hoppa, Bill Burgos
Background: Assessing basketball shoe comfort and fit as personal protection equipment (PPE) at the collegiate level is unique. Objective: The purpose of Part II in this pilot study was to examine the effect of shoe design on the perception of comfort and fit after performing an acute series of jumps in elite male and female National Collegiate Athletic Association (NCAA) Division 1 basketball student-athletes. Method: A total of sixteen basketball student-athletes (six males, ten females) performed two rounds of acute series of four styled basketball jumps on two ForceDecksTM Force Platforms while trying to maximize jump height by tapping VertecTM Jump Vanes. The male student-athletes selected the AdidasTM Harden Vol. 3 and the AdidasTM SM Pro basketball shoes. The female student-athletes selected the Adidas Harden Vol. 3 and the Adidas Captain Marvel basketball shoes. Upon completion of each round of jumps, the student-athlete recorded their perception of comfort on a 110mm Visual Analog Scale (VAS) and fit on a seven-point Likert rating scale based against their most comfortable basketball shoes ever worn. Results: Results of this pilot study reported, on average, the male student-athletes preferred comfort and fit of the Adidas SM Pro basketball shoes and the female student-athletes preferred the Adidas Harden Vol. 3 basketball shoe, though differences were non-significant at p > 0.05. Conclusion: The use of a human factors assessment tool to evaluate basketball shoe comfort and fit and the influence of rated comfort and fit parameters on basketball jumping performance proved viable.
{"title":"Perception of Comfort, Fit, and Jumping Performance of Elite NCAA Division 1 Student-athletes: The Effect of Basketball Shoe Design – Part II","authors":"Tony Luczak, Reuben F. Burch, Brian K. Smith, J. Lamberth, Daniel W. Carruth, Collin Crane, Marci Hoppa, Bill Burgos","doi":"10.7575/aiac.ijkss.v.8n.3p.45","DOIUrl":"https://doi.org/10.7575/aiac.ijkss.v.8n.3p.45","url":null,"abstract":"Background: Assessing basketball shoe comfort and fit as personal protection equipment (PPE) at the collegiate level is unique. Objective: The purpose of Part II in this pilot study was to examine the effect of shoe design on the perception of comfort and fit after performing an acute series of jumps in elite male and female National Collegiate Athletic Association (NCAA) Division 1 basketball student-athletes. Method: A total of sixteen basketball student-athletes (six males, ten females) performed two rounds of acute series of four styled basketball jumps on two ForceDecksTM Force Platforms while trying to maximize jump height by tapping VertecTM Jump Vanes. The male student-athletes selected the AdidasTM Harden Vol. 3 and the AdidasTM SM Pro basketball shoes. The female student-athletes selected the Adidas Harden Vol. 3 and the Adidas Captain Marvel basketball shoes. Upon completion of each round of jumps, the student-athlete recorded their perception of comfort on a 110mm Visual Analog Scale (VAS) and fit on a seven-point Likert rating scale based against their most comfortable basketball shoes ever worn. Results: Results of this pilot study reported, on average, the male student-athletes preferred comfort and fit of the Adidas SM Pro basketball shoes and the female student-athletes preferred the Adidas Harden Vol. 3 basketball shoe, though differences were non-significant at p > 0.05. Conclusion: The use of a human factors assessment tool to evaluate basketball shoe comfort and fit and the influence of rated comfort and fit parameters on basketball jumping performance proved viable.","PeriodicalId":36327,"journal":{"name":"International Journal of Kinesiology and Sports Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44679368","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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