Pub Date : 2019-06-01DOI: 10.1249/01.MSS.0000561285.11277.2E
Thomas W Kernozek, Brett McCutchin, Maria Lee, Jackie Cleerman, Jessica Onsager, Jeremie Schiedermayer, Becky L Heinert, Drew Rutherforc
RESULTS: Asymmetry in SAV at 4 months was a significant predictor for asymmetries in the isometric quadriceps strength (r=0.39, p=.02), single hop for distance (r=0.36, p=.02), triple hop for distance (r=0.34, p=.03), and triple-crossover hop for distance (r=0.51, p=.001), but not for the 6-meter timed hop (r=0.17, p=.14) at 6 months. Greater SAV asymmetry was a significant predictor for worse scores on the KOS-ADLS (r=0.49, p=.006) and GRS (r=0.46, p=.008). CONCLUSIONS: This pilot study showed that gait asymmetry detected by inertial sensors at early stage of rehabilitation can predict functional performance at 6 months after ACLR. Implementing these sensors in clinical practice may help clinicians to monitor gait on a regular basis during rehabilitation.
{"title":"Post-Trial Feedback Alters Single and Dual Task Landing Performance in Healthy and ACL Reconstructed Athletes","authors":"Thomas W Kernozek, Brett McCutchin, Maria Lee, Jackie Cleerman, Jessica Onsager, Jeremie Schiedermayer, Becky L Heinert, Drew Rutherforc","doi":"10.1249/01.MSS.0000561285.11277.2E","DOIUrl":"https://doi.org/10.1249/01.MSS.0000561285.11277.2E","url":null,"abstract":"RESULTS: Asymmetry in SAV at 4 months was a significant predictor for asymmetries in the isometric quadriceps strength (r=0.39, p=.02), single hop for distance (r=0.36, p=.02), triple hop for distance (r=0.34, p=.03), and triple-crossover hop for distance (r=0.51, p=.001), but not for the 6-meter timed hop (r=0.17, p=.14) at 6 months. Greater SAV asymmetry was a significant predictor for worse scores on the KOS-ADLS (r=0.49, p=.006) and GRS (r=0.46, p=.008). CONCLUSIONS: This pilot study showed that gait asymmetry detected by inertial sensors at early stage of rehabilitation can predict functional performance at 6 months after ACLR. Implementing these sensors in clinical practice may help clinicians to monitor gait on a regular basis during rehabilitation.","PeriodicalId":18500,"journal":{"name":"Medicine & Science in Sports & Exercise","volume":"28 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81812236","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 : 2019-06-01DOI: 10.1249/01.MSS.0000561214.20219.6D
Mary C. Hidde, Kelli A. LeBreton, K. Covington, C. Jankowski, H. Leach
PURPOSE: Exercise interventions can improve fitness and quality of life among breast cancer survivors. The magnitude of these effects may be dependent on compliance to the intended exercise prescription (ExRx), but few studies in cancer survivors have reported this information. This study examined breast cancer survivors’ ExRx compliance during a personal training (PT) or group-based exercise (GBE) intervention. METHODS: Women (N=26) with stage I-II breast cancer who had completed chemotherapy and/or radiation treatment within the previous year were randomly assigned to PT or GBE for 8 weeks. All participants received supervised exercise twice per week for 60 minutes a session. Participants were compliant to aerobic ExRx if they completed 20-30 minutes at 50-80% of heart rate reserve. Participants were compliant to upper and lower body resistance ExRx if they completed 2-3 sets of 8 repetitions within 50-80% of 1RM for chest and leg press. Compliance to aerobic, upper, and lower resistance ExRx was coded dichotomously (yes/no) for each session, then summed and divided by the number of sessions attended to calculate percent compliance. Independent t-tests examined differences in ExRx compliance between PT and GBE. Results are reported as mean±SD. RESULTS: Participants were aged 52±8.5 years, and 13.4±5.1 months post diagnosis. Of the N=24 who completed the intervention, exercise session attendance was 15.8±0.5 (99%) in PT, and 13.4±1.0 (82%) in GBE out of 16 possible sessions (p=.000). Compliance for aerobic ExRx was 77.2±0.17% in PT, and 70.1±0.17% in GBE (p=.41). Compliance for upper body resistance ExRx was 76.0±0.37% in PT and 82.4±0.20% in GBE (p=.597). Compliance for lower body resistance exercise was 80.2±0.23% in PT and 87.9±0.21% in GBE (p=.40). CONCLUSION: Exercise session attendance was higher in PT. Overall ExRx compliance was >70% for aerobic, >80% for resistance, and similar in PT and GBE. With growing support for establishing exercise programs for cancer survivors, it is important to determine sustainable and scalable delivery modalities. GBE may be more resource conscientious than PT, and this study suggests GBE can achieve comparable ExRx compliance to PT. Future exercise intervention studies in breast cancer survivors should examine how ExRx compliance affects health and/or fitness outcomes.
{"title":"Personal Training vs. Group-based Exercise Prescription Compliance In Breast Cancer Survivors","authors":"Mary C. Hidde, Kelli A. LeBreton, K. Covington, C. Jankowski, H. Leach","doi":"10.1249/01.MSS.0000561214.20219.6D","DOIUrl":"https://doi.org/10.1249/01.MSS.0000561214.20219.6D","url":null,"abstract":"PURPOSE: Exercise interventions can improve fitness and quality of life among breast cancer survivors. The magnitude of these effects may be dependent on compliance to the intended exercise prescription (ExRx), but few studies in cancer survivors have reported this information. This study examined breast cancer survivors’ ExRx compliance during a personal training (PT) or group-based exercise (GBE) intervention. METHODS: Women (N=26) with stage I-II breast cancer who had completed chemotherapy and/or radiation treatment within the previous year were randomly assigned to PT or GBE for 8 weeks. All participants received supervised exercise twice per week for 60 minutes a session. Participants were compliant to aerobic ExRx if they completed 20-30 minutes at 50-80% of heart rate reserve. Participants were compliant to upper and lower body resistance ExRx if they completed 2-3 sets of 8 repetitions within 50-80% of 1RM for chest and leg press. Compliance to aerobic, upper, and lower resistance ExRx was coded dichotomously (yes/no) for each session, then summed and divided by the number of sessions attended to calculate percent compliance. Independent t-tests examined differences in ExRx compliance between PT and GBE. Results are reported as mean±SD. RESULTS: Participants were aged 52±8.5 years, and 13.4±5.1 months post diagnosis. Of the N=24 who completed the intervention, exercise session attendance was 15.8±0.5 (99%) in PT, and 13.4±1.0 (82%) in GBE out of 16 possible sessions (p=.000). Compliance for aerobic ExRx was 77.2±0.17% in PT, and 70.1±0.17% in GBE (p=.41). Compliance for upper body resistance ExRx was 76.0±0.37% in PT and 82.4±0.20% in GBE (p=.597). Compliance for lower body resistance exercise was 80.2±0.23% in PT and 87.9±0.21% in GBE (p=.40). CONCLUSION: Exercise session attendance was higher in PT. Overall ExRx compliance was >70% for aerobic, >80% for resistance, and similar in PT and GBE. With growing support for establishing exercise programs for cancer survivors, it is important to determine sustainable and scalable delivery modalities. GBE may be more resource conscientious than PT, and this study suggests GBE can achieve comparable ExRx compliance to PT. Future exercise intervention studies in breast cancer survivors should examine how ExRx compliance affects health and/or fitness outcomes.","PeriodicalId":18500,"journal":{"name":"Medicine & Science in Sports & Exercise","volume":"449 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79681260","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 : 2019-05-29DOI: 10.1249/MSS.0000000000002054
S. Saedmocheshi, M. Saghebjoo, Z. Vahabzadeh, Dariush Sheikholeslami-Vatani
INTRODUCTION Aerobic training and green tea extract can be used to reduce the risk of prostate cancer. The goal of this study was to evaluate the effects of eight-week aerobic exercise training and administration of green tea extract on the level of nuclear factor kappa B (NF-kB), cyclooxygenase-2 (COX-2) and p53 tumor suppressor protein (p53) in prostate of rats which were stimulated by N-Methyl-N-nitrosourea (NMU) to induce the prostate cancer. METHODS 60 adult male Wistar rats were assigned into six groups including healthy control (HCt), cancer control (CCt), cancer training (CTr: 45 min/day at low-moderate intensity, 5 times/week, 8 weeks), cancer extract (CEx: 1.34 ml of green tea extract, 3 times/week, 8 weeks), cancer training+ cancer extract (CTr+CEx) and sham groups. Rats were sacrificed 48 hours after the last intervention session, and the prostate tissue was isolated to measure the levels of NF-kB, COX-2, and p53. RESULTS The NF- kB level in CCt group was increased significantly compared to the HCt (P=0.02). In the CTr group, NF-kB level was decreased significantly compared to the CCt and CEx groups (P=0.001 and 0.05, respectively). In addition, the levels of P53 protein were reduced in CTr, CEx and CTr+CEx groups compared to CCt group (P=0.001, 0.02 and 0.004, respectively). No significant changes were found in the level of COX-2 between groups. CONCLUSIONS These results suggest that a long-term exercise training combined with the intake of green tea extract may reduce levels of NF-kB and p53 in rats with prostate cancer. Given the importance of recognizing complementary therapies in this regard, future studies are warranted.
{"title":"Aerobic Training and Green Tea Extract Protect against NMU-induced Prostate Cancer.","authors":"S. Saedmocheshi, M. Saghebjoo, Z. Vahabzadeh, Dariush Sheikholeslami-Vatani","doi":"10.1249/MSS.0000000000002054","DOIUrl":"https://doi.org/10.1249/MSS.0000000000002054","url":null,"abstract":"INTRODUCTION\u0000Aerobic training and green tea extract can be used to reduce the risk of prostate cancer. The goal of this study was to evaluate the effects of eight-week aerobic exercise training and administration of green tea extract on the level of nuclear factor kappa B (NF-kB), cyclooxygenase-2 (COX-2) and p53 tumor suppressor protein (p53) in prostate of rats which were stimulated by N-Methyl-N-nitrosourea (NMU) to induce the prostate cancer.\u0000\u0000\u0000METHODS\u000060 adult male Wistar rats were assigned into six groups including healthy control (HCt), cancer control (CCt), cancer training (CTr: 45 min/day at low-moderate intensity, 5 times/week, 8 weeks), cancer extract (CEx: 1.34 ml of green tea extract, 3 times/week, 8 weeks), cancer training+ cancer extract (CTr+CEx) and sham groups. Rats were sacrificed 48 hours after the last intervention session, and the prostate tissue was isolated to measure the levels of NF-kB, COX-2, and p53.\u0000\u0000\u0000RESULTS\u0000The NF- kB level in CCt group was increased significantly compared to the HCt (P=0.02). In the CTr group, NF-kB level was decreased significantly compared to the CCt and CEx groups (P=0.001 and 0.05, respectively). In addition, the levels of P53 protein were reduced in CTr, CEx and CTr+CEx groups compared to CCt group (P=0.001, 0.02 and 0.004, respectively). No significant changes were found in the level of COX-2 between groups.\u0000\u0000\u0000CONCLUSIONS\u0000These results suggest that a long-term exercise training combined with the intake of green tea extract may reduce levels of NF-kB and p53 in rats with prostate cancer. Given the importance of recognizing complementary therapies in this regard, future studies are warranted.","PeriodicalId":18500,"journal":{"name":"Medicine & Science in Sports & Exercise","volume":"1973 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82735125","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 : 2018-08-04DOI: 10.1249/01.mss.0000535750.40951.c1
A. P. Quintero, M. A. Domínguez-Sánchez, K. Bonilla-Vargas, J. Correa-Bautista, G. P. Velasco-Orjuela, A. García-Hermoso, Alejandra Tordecilla-Sanders, R. Ramírez‐Vélez
There is currently a consensus about the positive effects of physical exercise on cognition. However, the exercise intensity-dependent effect on executive function remains unclear. Thus, the aim of this study was to compare the acute effects of high-intensity aerobic interval training (HIIT), resistance training (RT), or combined training (RT+ HIIT) on executive function indicators in overweight inactive men adults (age 18–30 years old). The participants were screened and excluded for medical conditions known to impact cognitive functioning, and that was measured with Moca test screening cognitive. Randomized, parallel-group clinical trial among 36 adults were randomly assigned to a HIIT, RT, RT+HIIT, and a control group (n=10) until the energy expenditure of 400-500 kcal. Cognitive inhibition and attention capacity were examined using Stroop Test and d2 Test of Attention respectively, were obtained pre-exercise for baseline measurement and immediately 1-min post-exercise for each exercise training modalities. Cognitive inhibition measured as Stroop test was improved after HIIT protocol for the reading +5.89(η2=0.33), colors naming +9.0(η2=0.60), interference +10.1 (η2=0.39) and index interference domain +6.0(η2=0.20). Additionally, the RT+HIIT group had an increase +7.1(η2=0.40) for the reading condition, colors naming +7.5(η2=0.80), and interference +5.8(η2=0.39). In regard to attentional capacity, the HIIT group elicit moderate to large improvements the concentration levels domain +21.7(η2=0.44), item processed domain +56.6 (η2=0.50), and % errors -3.0(η2=0.27). These results were similar in RT and RT+HIIT group on concentration levels and item processed domain(P<0.05). In conclusion, acute HIIT and RT+HIIT session reported moderate to large effect sizes than RT alone for cognitive inhibition and attention capacity. Taken together, the results suggest that even short-term exercise interventions can enhance overweight adults’ executive functions.
体育锻炼对认知的积极作用目前已形成共识。然而，运动强度对执行功能的影响仍不清楚。因此，本研究的目的是比较高强度有氧间歇训练(HIIT)、阻力训练(RT)或联合训练(RT+ HIIT)对超重非运动成年男性(18-30岁)执行功能指标的急性影响。参与者被筛选并排除已知影响认知功能的医疗条件，并通过Moca测试筛选认知。将36名成年人随机分为HIIT组、RT组、RT+HIIT组和对照组(n=10)，直到能量消耗400-500 kcal，分别使用Stroop Test和d2 Test of attention检测认知抑制和注意能力，并在运动前和运动后1分钟立即对每种运动训练方式进行基线测量。HIIT方案后Stroop测试的认知抑制在阅读+5.89(η2=0.33)、颜色命名+9.0(η2=0.60)、干扰+10.1 (η2=0.39)和指数干扰域+6.0(η2=0.20)方面得到改善。此外，RT+HIIT组的阅读状况增加了+7.1(η2=0.40)，颜色命名增加了+7.5(η2=0.80)，干扰增加了+5.8(η2=0.39)。在注意能力方面，HIIT组的注意力集中水平为+21.7(η2=0.44)，项目处理水平为+56.6 (η2=0.50)，误差率为-3.0(η2=0.27)。RT组和RT+HIIT组在浓度水平和项目加工域上的结果相似(P<0.05)。总之，急性HIIT和RT+HIIT治疗比单独RT治疗对认知抑制和注意能力的影响中等到较大。综上所述，研究结果表明，即使是短期的运动干预也能增强超重成年人的执行功能。
{"title":"Acute Effect of Three Different Exercise Training Modalities on Executive Function in Overweight Inactive Men: The BrainFit Study","authors":"A. P. Quintero, M. A. Domínguez-Sánchez, K. Bonilla-Vargas, J. Correa-Bautista, G. P. Velasco-Orjuela, A. García-Hermoso, Alejandra Tordecilla-Sanders, R. Ramírez‐Vélez","doi":"10.1249/01.mss.0000535750.40951.c1","DOIUrl":"https://doi.org/10.1249/01.mss.0000535750.40951.c1","url":null,"abstract":"There is currently a consensus about the positive effects of physical exercise on cognition. However, the exercise intensity-dependent effect on executive function remains unclear. Thus, the aim of this study was to compare the acute effects of high-intensity aerobic interval training (HIIT), resistance training (RT), or combined training (RT+ HIIT) on executive function indicators in overweight inactive men adults (age 18–30 years old). The participants were screened and excluded for medical conditions known to impact cognitive functioning, and that was measured with Moca test screening cognitive. Randomized, parallel-group clinical trial among 36 adults were randomly assigned to a HIIT, RT, RT+HIIT, and a control group (n=10) until the energy expenditure of 400-500 kcal. Cognitive inhibition and attention capacity were examined using Stroop Test and d2 Test of Attention respectively, were obtained pre-exercise for baseline measurement and immediately 1-min post-exercise for each exercise training modalities. Cognitive inhibition measured as Stroop test was improved after HIIT protocol for the reading +5.89(η2=0.33), colors naming +9.0(η2=0.60), interference +10.1 (η2=0.39) and index interference domain +6.0(η2=0.20). Additionally, the RT+HIIT group had an increase +7.1(η2=0.40) for the reading condition, colors naming +7.5(η2=0.80), and interference +5.8(η2=0.39). In regard to attentional capacity, the HIIT group elicit moderate to large improvements the concentration levels domain +21.7(η2=0.44), item processed domain +56.6 (η2=0.50), and % errors -3.0(η2=0.27). These results were similar in RT and RT+HIIT group on concentration levels and item processed domain(P<0.05). In conclusion, acute HIIT and RT+HIIT session reported moderate to large effect sizes than RT alone for cognitive inhibition and attention capacity. Taken together, the results suggest that even short-term exercise interventions can enhance overweight adults’ executive functions.","PeriodicalId":18500,"journal":{"name":"Medicine & Science in Sports & Exercise","volume":"329 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77611224","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 : 2018-05-01DOI: 10.1249/01.mss.0000535172.81694.63
J. Koning, T. Veneman, W. Schallig, M. Eken, C. Foster
{"title":"The Physiological and Perceptual Response to Self-, Even- and Variable Paced Cycling Time Trials: 192 Board #33 May 30 9 30 AM - 11 00 AM","authors":"J. Koning, T. Veneman, W. Schallig, M. Eken, C. Foster","doi":"10.1249/01.mss.0000535172.81694.63","DOIUrl":"https://doi.org/10.1249/01.mss.0000535172.81694.63","url":null,"abstract":"","PeriodicalId":18500,"journal":{"name":"Medicine & Science in Sports & Exercise","volume":"83 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76095500","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 : 2017-05-01DOI: 10.1249/01.mss.0000518799.14205.44
Travis Anderson, Zachary Kincaid, L. Wideman, S. Shultz
RESULTS: Pain at exercise (on a visual analogue scale 0-10) was reduced from 6±2 to 2±2 at six weeks and 1±1 after 12 weeks of treatment. Morning stiffness was reduced at six weeks by 56% and 87% after 12 weeks. The degree of neovascularisation in PowerDoppler ultrasound was reduced from Öhberg degree 3+ to 0-1+ after 12 weeks as was the tendon diameter by 38% in grey scale ultrasound. VISA-P scores improved by 32% at six weeks and 51% at 12 weeks. Players were able to return to sport at mean 18±12 days after initiation of the weekly therapy. CONCLUSIONS: Combined focused shockwave & low level laser tendon therapy accompanied by daily eccentric training are able to improve patella tendon function with a sustained effect in soccer athletes with an early return to game play.
{"title":"Relaxin Influences Knee Laxity Changes Across the Menstrual Cycle: 2431 Board #4 June 2 9","authors":"Travis Anderson, Zachary Kincaid, L. Wideman, S. Shultz","doi":"10.1249/01.mss.0000518799.14205.44","DOIUrl":"https://doi.org/10.1249/01.mss.0000518799.14205.44","url":null,"abstract":"RESULTS: Pain at exercise (on a visual analogue scale 0-10) was reduced from 6±2 to 2±2 at six weeks and 1±1 after 12 weeks of treatment. Morning stiffness was reduced at six weeks by 56% and 87% after 12 weeks. The degree of neovascularisation in PowerDoppler ultrasound was reduced from Öhberg degree 3+ to 0-1+ after 12 weeks as was the tendon diameter by 38% in grey scale ultrasound. VISA-P scores improved by 32% at six weeks and 51% at 12 weeks. Players were able to return to sport at mean 18±12 days after initiation of the weekly therapy. CONCLUSIONS: Combined focused shockwave & low level laser tendon therapy accompanied by daily eccentric training are able to improve patella tendon function with a sustained effect in soccer athletes with an early return to game play.","PeriodicalId":18500,"journal":{"name":"Medicine & Science in Sports & Exercise","volume":"18 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91164289","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 : 2017-05-01DOI: 10.1249/01.MSS.0000518028.27091.54
B. Pietrosimone, C. Kuenze, Joseph P. Hart, C. Thigpen, A. Lepley, J. Blackburn, D. Padua, T. Grindstaff, H. Davis, D. Bell
{"title":"Association between Body Mass Index and Disability in Individuals with Unilateral Anterior Cruciate Ligament Reconstruction: 1498 Board #173 June 1 8","authors":"B. Pietrosimone, C. Kuenze, Joseph P. Hart, C. Thigpen, A. Lepley, J. Blackburn, D. Padua, T. Grindstaff, H. Davis, D. Bell","doi":"10.1249/01.MSS.0000518028.27091.54","DOIUrl":"https://doi.org/10.1249/01.MSS.0000518028.27091.54","url":null,"abstract":"","PeriodicalId":18500,"journal":{"name":"Medicine & Science in Sports & Exercise","volume":"43 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78012613","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 : 2017-05-01DOI: 10.1249/01.mss.0000519633.59031.87
V. C. Chia, A. Wei, Cynthia Villalobos, N. Laskosky, C. Jensen
Student athletes are required to perform both in the classroom and on the field; balancing these commitments can be stressful. It is common to question the burden of athletic demands on student scholarship. However, the inverse is seldom asked: how do scholastic stresses affect athletic performance? PURPOSE: To test the effect of psychological stress on skeletal muscle performance in college students. METHODS: We enrolled 23 recreationally active students (10 men, 13 women) from a D1 university. Skeletal muscle function was assessed via quadriceps extension and hamstring flexion using a Cybex HUMAC NORM dynamometer. Psychological stress was measured with the Cohen Perceived Stress Scale. Subjects were evaluated at two time points: a high stress period (exams) and a low stress period (no exams). A history of injury excluded subjects from participation; nightly sleep, history of exercise, and recent exercise were controlled. Independent variables were stress, sex, age, weight, BMI, academic load, and participation in organized sports (club or intramural). Dependent variables were peak torque (ft/lb) and time to achieve peak torque (sec). Differences in muscle performance between high and low stress periods were assessed with t-tests. Linear regressions analyzed the effect of psychological stress on muscle performance. RESULTS: Subjects were 20.2 ± 1.1 years old, had peak flexor torque of 87.4 ± 19.7 ft/lb (achieved in 0.58 ± 0.12 sec), and peak extensor torque of 145.2 ± 37.5 ft/lb (achieved in 0.58 ± 0.15 sec). T-tests found no differences between low and high stress periods in peak torque or time to achieve peak torque (p>0.090). Linear regression found increases in psychological stress to correlate with improvements in the overall rate of force development (p=0.004). The effect was strongest with flexors: for each point that stress increased, time to achieve peak torque was 2.4% faster (p=0.002). CONCLUSION: Despite a small sample size, these findings suggest psychological stress may enhance force development. A possible mechanism could be sympatheticallymediated potentiation of calcium release. While academic stress presents many challenges for student-athletes, it does not appear to be detrimental to muscular performance.
{"title":"The Relationship Between Academic Stress and Skeletal Muscle Performance: 3367 Board #272 June 2 3","authors":"V. C. Chia, A. Wei, Cynthia Villalobos, N. Laskosky, C. Jensen","doi":"10.1249/01.mss.0000519633.59031.87","DOIUrl":"https://doi.org/10.1249/01.mss.0000519633.59031.87","url":null,"abstract":"Student athletes are required to perform both in the classroom and on the field; balancing these commitments can be stressful. It is common to question the burden of athletic demands on student scholarship. However, the inverse is seldom asked: how do scholastic stresses affect athletic performance? PURPOSE: To test the effect of psychological stress on skeletal muscle performance in college students. METHODS: We enrolled 23 recreationally active students (10 men, 13 women) from a D1 university. Skeletal muscle function was assessed via quadriceps extension and hamstring flexion using a Cybex HUMAC NORM dynamometer. Psychological stress was measured with the Cohen Perceived Stress Scale. Subjects were evaluated at two time points: a high stress period (exams) and a low stress period (no exams). A history of injury excluded subjects from participation; nightly sleep, history of exercise, and recent exercise were controlled. Independent variables were stress, sex, age, weight, BMI, academic load, and participation in organized sports (club or intramural). Dependent variables were peak torque (ft/lb) and time to achieve peak torque (sec). Differences in muscle performance between high and low stress periods were assessed with t-tests. Linear regressions analyzed the effect of psychological stress on muscle performance. RESULTS: Subjects were 20.2 ± 1.1 years old, had peak flexor torque of 87.4 ± 19.7 ft/lb (achieved in 0.58 ± 0.12 sec), and peak extensor torque of 145.2 ± 37.5 ft/lb (achieved in 0.58 ± 0.15 sec). T-tests found no differences between low and high stress periods in peak torque or time to achieve peak torque (p>0.090). Linear regression found increases in psychological stress to correlate with improvements in the overall rate of force development (p=0.004). The effect was strongest with flexors: for each point that stress increased, time to achieve peak torque was 2.4% faster (p=0.002). CONCLUSION: Despite a small sample size, these findings suggest psychological stress may enhance force development. A possible mechanism could be sympatheticallymediated potentiation of calcium release. While academic stress presents many challenges for student-athletes, it does not appear to be detrimental to muscular performance.","PeriodicalId":18500,"journal":{"name":"Medicine & Science in Sports & Exercise","volume":"34 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77016409","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 : 2017-05-01DOI: 10.1249/01.MSS.0000518460.80954.75
I. Marques, G. Balbim, M. Magallanes, J. Rocha, D. Marquez
{"title":"Perceived Barriers to Physical Activity among Latino Caregivers: 2053 Board #66 June 1 2","authors":"I. Marques, G. Balbim, M. Magallanes, J. Rocha, D. Marquez","doi":"10.1249/01.MSS.0000518460.80954.75","DOIUrl":"https://doi.org/10.1249/01.MSS.0000518460.80954.75","url":null,"abstract":"","PeriodicalId":18500,"journal":{"name":"Medicine & Science in Sports & Exercise","volume":"383 1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77251542","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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