BACKGROUND: Beetroot juice is an ergogenic aid containing high levels of nitrate and is known to have many physiological benefits. OBJECTIVE: This study aimed to examine the effects of beetroot juice supplementation on the physical capacity and isokinetic muscle function of power athletes. METHODS: Thirteen power athletes were orally administered three different volumes of beetroot juice: placebo (70 ml), low-volume beetroot juice (70 ml), and high-volume beetroot juice (140 ml). The Harvard step test, 20 m sprint, side-step, reaction time, Wingate test, blood lactate analysis, and isokinetic knee and trunk tests were performed to confirm their physical capacity and isokinetic muscle function. Significant differences between the drink groups were determined using repeated-measures ANOVA. RESULTS: There were no significant differences in the Harvard step, side step, whole-body reaction time, anaerobic power, blood lactate concentration, and isokinetic muscular strength in the knee and trunk for all groups. However, the 20 m sprint and isokinetic muscular endurance of the knee extensor were significantly higher with beetroot juice intake. CONCLUSIONS: Our findings suggest that > 70 ml of beetroot juice supplement before performance may be useful as an ergogenic supplement to improve performance-related physical fitness, including speed and muscular endurance, in power athletes.
{"title":"High or low volume beetroot juice supplementation might positively affect physical capacity and isokinetic muscle function in power athletes","authors":"Hyuk Sakong, Yeong-Hyun Cho, Tae-Beom Seo","doi":"10.3233/ies-230011","DOIUrl":"https://doi.org/10.3233/ies-230011","url":null,"abstract":"BACKGROUND: Beetroot juice is an ergogenic aid containing high levels of nitrate and is known to have many physiological benefits. OBJECTIVE: This study aimed to examine the effects of beetroot juice supplementation on the physical capacity and isokinetic muscle function of power athletes. METHODS: Thirteen power athletes were orally administered three different volumes of beetroot juice: placebo (70 ml), low-volume beetroot juice (70 ml), and high-volume beetroot juice (140 ml). The Harvard step test, 20 m sprint, side-step, reaction time, Wingate test, blood lactate analysis, and isokinetic knee and trunk tests were performed to confirm their physical capacity and isokinetic muscle function. Significant differences between the drink groups were determined using repeated-measures ANOVA. RESULTS: There were no significant differences in the Harvard step, side step, whole-body reaction time, anaerobic power, blood lactate concentration, and isokinetic muscular strength in the knee and trunk for all groups. However, the 20 m sprint and isokinetic muscular endurance of the knee extensor were significantly higher with beetroot juice intake. CONCLUSIONS: Our findings suggest that > 70 ml of beetroot juice supplement before performance may be useful as an ergogenic supplement to improve performance-related physical fitness, including speed and muscular endurance, in power athletes.","PeriodicalId":54915,"journal":{"name":"Isokinetics and Exercise Science","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44438991","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ferdia Fallon Verbruggen, Mikulas Hank, Petr Miřátský, T. Malý, F. Zahálka
BACKGROUND: Strength differences between performance levels remain unclear in female football. Furthermore, the relationship between fulltime training and strength has been unexplored despite increased professionalisation in the sport. OBJECTIVE: The aims of this research were to examine knee flexor/extensor and hip adductor/abductor strength differences between elite and sub-elite female footballers, and then determine the relationship of strength performance to age, years of football experience (FE), and years of fulltime training (FTT). METHODS: 15 elite and 15 sub-elite professional female footballers were tested. The main outcomes were concentric isokinetic knee flexor and extensor peak moment at 60, 180, and 300∘/s, and isometric hip adductor (ADD) and abductor (ABD) force. RESULTS: The elite team had higher absolute (300∘/s: 47.13–49.33 Nm vs 37.33–38.93 Nm, p< 0.05) and normalised (300∘/s: 0.76–0.80 Nm/kg vs 0.59–0.62 Nm/kg, p< 0.05) knee flexor values, and higher normalised ADD (5.64–5.66 N/kg vs 4.98–5.05 N/kg, p< 0.05) and ABD force (5.80–6.00 N/kg vs 5.26–5.39 N/kg, p< 0.05), compared to the sub-elite team. Age, FE, and FTT were correlated to knee flexor values (r= 0.381–0.559, p< 0.05). Additionally, FTT was correlated with normalised ADD and ABD force (r= 0.362–0.546, p< 0.05). CONCLUSION: Sub-elite female footballers may require additional knee flexor and hip strengthening in order to make the step up to the elite level. Those who are younger or have low FTT may also be recommended additional lower limb strengthening ahead of joining a fulltime training environment.
背景:女子足球中不同表现水平的力量差异尚不清楚。此外，尽管这项运动的职业化程度越来越高，但全职训练和力量之间的关系尚未得到探索。目的:本研究的目的是检查优秀和次优秀女子足球运动员的膝关节屈/伸肌和髋关节内收/外展肌力量差异，然后确定力量表现与年龄、足球经验年数(FE)和全职训练年数(FTT)的关系。方法:对15名优秀和15名次优秀职业女足运动员进行测试。主要结果是60、180和300°/s时膝关节屈伸肌的同心等速峰值力矩，以及髋内收肌(ADD)和外展肌(ABD)的等速力。结果:与次精英组相比，精英组膝盖屈肌绝对值(300°/s: 47.13-49.33 Nm vs 37.33-38.93 Nm, p< 0.05)和归一化值(300°/s: 0.76-0.80 Nm/kg vs 0.59-0.62 Nm/kg, p< 0.05)较高，归一化ADD (5.64-5.66 N/kg vs 4.98-5.05 N/kg, p< 0.05)和ABD力(5.80-6.00 N/kg vs 5.26-5.39 N/kg, p< 0.05)较高。年龄、FE、FTT与膝关节屈肌值相关(r= 0.381 ~ 0.559, p< 0.05)。此外，FTT与标准化ADD和ABD力相关(r= 0.362 ~ 0.546, p< 0.05)。结论:次优秀的女足运动员可能需要额外的膝关节屈肌和髋关节强化才能达到优秀水平。那些年龄较小或FTT较低的人也可以在参加全日制训练环境之前进行额外的下肢强化训练。
{"title":"Lower limb strength and training experience in elite and sub-elite female footballers","authors":"Ferdia Fallon Verbruggen, Mikulas Hank, Petr Miřátský, T. Malý, F. Zahálka","doi":"10.3233/ies-230038","DOIUrl":"https://doi.org/10.3233/ies-230038","url":null,"abstract":"BACKGROUND: Strength differences between performance levels remain unclear in female football. Furthermore, the relationship between fulltime training and strength has been unexplored despite increased professionalisation in the sport. OBJECTIVE: The aims of this research were to examine knee flexor/extensor and hip adductor/abductor strength differences between elite and sub-elite female footballers, and then determine the relationship of strength performance to age, years of football experience (FE), and years of fulltime training (FTT). METHODS: 15 elite and 15 sub-elite professional female footballers were tested. The main outcomes were concentric isokinetic knee flexor and extensor peak moment at 60, 180, and 300∘/s, and isometric hip adductor (ADD) and abductor (ABD) force. RESULTS: The elite team had higher absolute (300∘/s: 47.13–49.33 Nm vs 37.33–38.93 Nm, p< 0.05) and normalised (300∘/s: 0.76–0.80 Nm/kg vs 0.59–0.62 Nm/kg, p< 0.05) knee flexor values, and higher normalised ADD (5.64–5.66 N/kg vs 4.98–5.05 N/kg, p< 0.05) and ABD force (5.80–6.00 N/kg vs 5.26–5.39 N/kg, p< 0.05), compared to the sub-elite team. Age, FE, and FTT were correlated to knee flexor values (r= 0.381–0.559, p< 0.05). Additionally, FTT was correlated with normalised ADD and ABD force (r= 0.362–0.546, p< 0.05). CONCLUSION: Sub-elite female footballers may require additional knee flexor and hip strengthening in order to make the step up to the elite level. Those who are younger or have low FTT may also be recommended additional lower limb strengthening ahead of joining a fulltime training environment.","PeriodicalId":54915,"journal":{"name":"Isokinetics and Exercise Science","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42382696","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
BACKGROUND: Measurements of hip abduction (ABD) and adduction (ADD) are important in strength and conditioning as well as in clinical practice. However, there is no clear consensus on how ABD and ADD compare in strength in different populations. OBJECTIVE: The aim was to perform a quantitative synthesis of comparisons between the isometric strength of ABD and ADD in different populations. METHODS: ABD and ADD strength data were collected and pooled mean values for ABD: ADD strength ratio were calculated and expressed as standardized mean differences. Forty studies of healthy adults, 5 studies of healthy older adults and 14 studies of adults with various musculoskeletal injuries were included in the analysis. RESULTS: Healthy (non-athletic) males, healthy older adults, and adults with hip and groin pathologies or osteoarthritis tend to have the same ADD and ABD strength; male athletes tend to have a stronger ADD compared with ABD; healthy females and adults with patellofemoral pain tend to have a stronger ABD compared with ADD. CONCLUSIONS: These results can serve as a database to help compare and interpret measurements of ADD and ABD strength ratio in different populations.
{"title":"Isometric hip abduction and adduction strength ratios: A literature review with quantitative synthesis","authors":"J. Marušič, Ž. Kozinc, V. Hadžić, N. Šarabon","doi":"10.3233/ies-220128","DOIUrl":"https://doi.org/10.3233/ies-220128","url":null,"abstract":"BACKGROUND: Measurements of hip abduction (ABD) and adduction (ADD) are important in strength and conditioning as well as in clinical practice. However, there is no clear consensus on how ABD and ADD compare in strength in different populations. OBJECTIVE: The aim was to perform a quantitative synthesis of comparisons between the isometric strength of ABD and ADD in different populations. METHODS: ABD and ADD strength data were collected and pooled mean values for ABD: ADD strength ratio were calculated and expressed as standardized mean differences. Forty studies of healthy adults, 5 studies of healthy older adults and 14 studies of adults with various musculoskeletal injuries were included in the analysis. RESULTS: Healthy (non-athletic) males, healthy older adults, and adults with hip and groin pathologies or osteoarthritis tend to have the same ADD and ABD strength; male athletes tend to have a stronger ADD compared with ABD; healthy females and adults with patellofemoral pain tend to have a stronger ABD compared with ADD. CONCLUSIONS: These results can serve as a database to help compare and interpret measurements of ADD and ABD strength ratio in different populations.","PeriodicalId":54915,"journal":{"name":"Isokinetics and Exercise Science","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48608580","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
BACKGROUND: The systematic characteristics of force generation and relaxation have been investigated using a graded isometric task for several target levels and magnitudes in the upper and lower limb. However, whether a relaxation modality affects the accuracy or speed of grading remains unclear. In addition, speed characteristics are still unclear in both force generation and relaxation modalities. OBJECTIVE: To investigate the effect of force adjustment modalities on force generation and relaxation characteristics. METHODS: Participants were instructed to match a target force level as quickly and as accurately as possible under peak and keep adjustment modalities. The force generation task was increased from 10% to 30%, 50%, and 70% of the maximum voluntary force (MVF). The force relaxation task was decreased from 70% to 50%, 30%, and 10% MVF. The recorded force was analyzed. Errors in reproduction were computed in both modalities and target levels of force. RESULTS: The errors of the peak adjustment modality were greater than those of the keep adjustment modality in both tasks. The reaction time was longer with the peak adjustment modality than with the keep adjustment modality in both tasks. CONCLUSION: Speed was affected by the choice of adjustment modality.
{"title":"Effect of force adjustment modalities on characteristics for force generation and relaxation","authors":"Chiaki Ohtaka, Motoko Fujiwara","doi":"10.3233/ies-220121","DOIUrl":"https://doi.org/10.3233/ies-220121","url":null,"abstract":"BACKGROUND: The systematic characteristics of force generation and relaxation have been investigated using a graded isometric task for several target levels and magnitudes in the upper and lower limb. However, whether a relaxation modality affects the accuracy or speed of grading remains unclear. In addition, speed characteristics are still unclear in both force generation and relaxation modalities. OBJECTIVE: To investigate the effect of force adjustment modalities on force generation and relaxation characteristics. METHODS: Participants were instructed to match a target force level as quickly and as accurately as possible under peak and keep adjustment modalities. The force generation task was increased from 10% to 30%, 50%, and 70% of the maximum voluntary force (MVF). The force relaxation task was decreased from 70% to 50%, 30%, and 10% MVF. The recorded force was analyzed. Errors in reproduction were computed in both modalities and target levels of force. RESULTS: The errors of the peak adjustment modality were greater than those of the keep adjustment modality in both tasks. The reaction time was longer with the peak adjustment modality than with the keep adjustment modality in both tasks. CONCLUSION: Speed was affected by the choice of adjustment modality.","PeriodicalId":54915,"journal":{"name":"Isokinetics and Exercise Science","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45327571","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
BACKGROUND: Postactivation potentiation (PAP) enhances contractility of skeletal muscle whereas fatigue deteriorates it. Available evidence suggests that the two phenomena may express differently in endurance and power athletes. OBJECTIVE: To compare the patterns of change in knee muscle contractility induced by PAP and fatigue between endurance and power athletes. METHODS: Eleven endurance and ten power athletes (age: 18–33 years) performed isokinetic fatigue and isometric PAP protocols with knee extensors and flexors on computerised dynamometer. Tensiomyography (TMG) of the vastus medialis and semitendinosus muscle medialis was performed before the protocols and during a 10-min recovery. RESULTS: The changes in TMG profile were most pronounced in the vastus medialis of power athletes following the PAP protocol and least pronounced in the semitendinosus of the endurance athletes following the fatigue protocol. The differences between athlete types were most significant for the time-domain TMG parameters of vastus medialis. A significant correlation (r= 0.51–0.73) between the fatigue indices and changes in TMG parameters was observed for the vastus medialis muscle only. CONCLUSIONS: The results show that the TMG patterns of PAP and fatigue in the vastus muscle differ between endurance and power athletes. In this muscle, the changes in TMG parameters are also strongly associated with the degree of fatigue.
{"title":"Comparison of tensiomyographic contractile properties of the knee muscles between endurance and power athletes","authors":"Matej Ipavec, Žiga Kukec, A. Kacin","doi":"10.3233/ies-230010","DOIUrl":"https://doi.org/10.3233/ies-230010","url":null,"abstract":"BACKGROUND: Postactivation potentiation (PAP) enhances contractility of skeletal muscle whereas fatigue deteriorates it. Available evidence suggests that the two phenomena may express differently in endurance and power athletes. OBJECTIVE: To compare the patterns of change in knee muscle contractility induced by PAP and fatigue between endurance and power athletes. METHODS: Eleven endurance and ten power athletes (age: 18–33 years) performed isokinetic fatigue and isometric PAP protocols with knee extensors and flexors on computerised dynamometer. Tensiomyography (TMG) of the vastus medialis and semitendinosus muscle medialis was performed before the protocols and during a 10-min recovery. RESULTS: The changes in TMG profile were most pronounced in the vastus medialis of power athletes following the PAP protocol and least pronounced in the semitendinosus of the endurance athletes following the fatigue protocol. The differences between athlete types were most significant for the time-domain TMG parameters of vastus medialis. A significant correlation (r= 0.51–0.73) between the fatigue indices and changes in TMG parameters was observed for the vastus medialis muscle only. CONCLUSIONS: The results show that the TMG patterns of PAP and fatigue in the vastus muscle differ between endurance and power athletes. In this muscle, the changes in TMG parameters are also strongly associated with the degree of fatigue.","PeriodicalId":54915,"journal":{"name":"Isokinetics and Exercise Science","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47918032","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
BACKGROUND: Deadlift (DL) and back squat (BSQ) are considered different exercises because of their kinematic and kinetic characteristics. However, there are similarities, such as joint movement and the maximal muscle strength generated. Although there are differences and similarities, it is unclear which is more related to athletic performance. OBJECTIVE: This study aimed to determine the relationship between DL and jump, acceleration, and change of direction and compare whether DL or BSQ differ in their relationship to jumping, acceleration, and change of direction. METHODS: Eighty male volleyball players (age: 19.6 ± 0.9 years, height: 179.2 ± 6.7 cm, mass: 71.9 ± 9.4 kg) volunteered to participate in this study. Countermovement jump (CMJ), 10-m sprint, and 1–5 repetition maximum (1–5 RM) BSQ were measured on day 1. The T-test and 1–5 RM DL were measured on day 2. RESULTS: DL had a significant and moderate relationship with all parameters of CMJ (r= 0.328, p< 0.01), 10-m sprint (r=-0.471, p< 0.01), and T-test (r=-0.441, p< 0.01). BSQ showed a significant and moderate relationship with the 10-m sprint (r=-0.489, p< 0.01) and T-test (r=-0.356, p< 0.01), but a significant and weak relationship only with CMJ (r=- 0.289, p< 0.01). In addition, no significant differences were found in the comparison of correlation coefficients (p> 0.05). CONCLUSIONS: Deadlift may be introduced as an alternative exercise to BSQ when there are limitations in the training environment, such as the lack of a squat rack to safely perform BSQ or home confinement due to external factors like pandemics.
{"title":"The relationship between jumping, acceleration, change of direction, and relative strength for deadlift and back squat","authors":"Junpei Shiba, R. Kuramochi","doi":"10.3233/ies-230009","DOIUrl":"https://doi.org/10.3233/ies-230009","url":null,"abstract":"BACKGROUND: Deadlift (DL) and back squat (BSQ) are considered different exercises because of their kinematic and kinetic characteristics. However, there are similarities, such as joint movement and the maximal muscle strength generated. Although there are differences and similarities, it is unclear which is more related to athletic performance. OBJECTIVE: This study aimed to determine the relationship between DL and jump, acceleration, and change of direction and compare whether DL or BSQ differ in their relationship to jumping, acceleration, and change of direction. METHODS: Eighty male volleyball players (age: 19.6 ± 0.9 years, height: 179.2 ± 6.7 cm, mass: 71.9 ± 9.4 kg) volunteered to participate in this study. Countermovement jump (CMJ), 10-m sprint, and 1–5 repetition maximum (1–5 RM) BSQ were measured on day 1. The T-test and 1–5 RM DL were measured on day 2. RESULTS: DL had a significant and moderate relationship with all parameters of CMJ (r= 0.328, p< 0.01), 10-m sprint (r=-0.471, p< 0.01), and T-test (r=-0.441, p< 0.01). BSQ showed a significant and moderate relationship with the 10-m sprint (r=-0.489, p< 0.01) and T-test (r=-0.356, p< 0.01), but a significant and weak relationship only with CMJ (r=- 0.289, p< 0.01). In addition, no significant differences were found in the comparison of correlation coefficients (p> 0.05). CONCLUSIONS: Deadlift may be introduced as an alternative exercise to BSQ when there are limitations in the training environment, such as the lack of a squat rack to safely perform BSQ or home confinement due to external factors like pandemics.","PeriodicalId":54915,"journal":{"name":"Isokinetics and Exercise Science","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43166901","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
BACKGROUND: Pelvic-drop exercise (PD) is unilateral weight-bearing exercise that is frequently performed in rehabilitation sessions because its easy application can trigger moderate-to-high gluteus medius (Gmed) activity. Hip rotation has been applied to effectively facilitate Gmed activity during exercise. OBJECTIVE: To determine the effects of PD with three different hip rotations on Gmed, tensor fasciae latae (TFL), gluteus maximus (Gmax) activity, and Gmed:TFL activity ratio in patients with Gmed weakness. METHODS: Eighteen subjects with Gmed weakness participated. Subjects performed three different forms of PD with neutral hip, hip internal rotation, and hip external rotation position. Surface electromyography was performed to quantify the activity of Gmed, TFL, and Gmax. RESULTS: PD with hip internal rotation showed significantly greater Gmed activity than with neutral hip and hip external rotation (P= 0.005 and P= 0.007, respectively). TFL also showed significantly greater activity during PD with hip interna rotation than neutral hip (P= 0.002). There were no significant differences in Gmax activity (P= 0.095) and Gmed:TFL activity ratio (P= 0.254) among different forms of PD. CONCLUSIONS: PD with hip internal rotation is recommended to stimulate greater Gmed activity while preserving Gmed:TFL muscle activity ratio.
{"title":"Effect of different pelvic-drop exercises on hip muscles activity in patients with gluteus medius weakness","authors":"Seung-min Baik, Ji-Hyun Lee","doi":"10.3233/ies-220125","DOIUrl":"https://doi.org/10.3233/ies-220125","url":null,"abstract":"BACKGROUND: Pelvic-drop exercise (PD) is unilateral weight-bearing exercise that is frequently performed in rehabilitation sessions because its easy application can trigger moderate-to-high gluteus medius (Gmed) activity. Hip rotation has been applied to effectively facilitate Gmed activity during exercise. OBJECTIVE: To determine the effects of PD with three different hip rotations on Gmed, tensor fasciae latae (TFL), gluteus maximus (Gmax) activity, and Gmed:TFL activity ratio in patients with Gmed weakness. METHODS: Eighteen subjects with Gmed weakness participated. Subjects performed three different forms of PD with neutral hip, hip internal rotation, and hip external rotation position. Surface electromyography was performed to quantify the activity of Gmed, TFL, and Gmax. RESULTS: PD with hip internal rotation showed significantly greater Gmed activity than with neutral hip and hip external rotation (P= 0.005 and P= 0.007, respectively). TFL also showed significantly greater activity during PD with hip interna rotation than neutral hip (P= 0.002). There were no significant differences in Gmax activity (P= 0.095) and Gmed:TFL activity ratio (P= 0.254) among different forms of PD. CONCLUSIONS: PD with hip internal rotation is recommended to stimulate greater Gmed activity while preserving Gmed:TFL muscle activity ratio.","PeriodicalId":54915,"journal":{"name":"Isokinetics and Exercise Science","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43676415","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Michelle de Meillon, M. Keegan, Darren Kwong, A. Green
BACKGROUND: Recently there has been a rise in female participation in running yet the female population is under-researched in sport specific research. Locally, many female athletes annually compete in numerous ultra-marathons (> 42 km). OBJECTIVE: This study investigated the importance of Gluteal muscle strength in dynamic pelvic stability of fatigued female endurance road runners. METHODS: Fourteen female endurance runners (age: 38.0 ± 10.12 years, BMI: 21.99 ± 2.37 kg/m2, and VO2max: 40 ± 5.34 ml/min/kg) volunteered for the participation of this study. Through isokinetic testing, muscle strength and fatigability of the Gluteus Maximus, Medius and Minimus was determined. Sign tests compared pelvis stability (unilateral Trendelenburg, Pelvic Bridge test and pelvic stability through a gait analysis) before and after an endurance run on a cambered and flat surface. Participants were divided into two groups based on change in pelvic stability after the fatigue intervention. RESULTS: The unaffected group was moderately younger; lighter in weight and had a lower BMI. Additionally, this group was largely more experienced (p= 0.61, d= 1.341); aerobically fit and ran significantly longer weekly distances (p= 0.002, d= 3.4). There was no statistical difference in isokinetic testing of strength and endurance hip flexion/extension and abduction/adduction between the two groups (p> 0.05). CONCLUSION: In conclusion, the group that was more experienced and ran longer weekly distances showed no change in pelvic stability after an endurance run. However, the group that showed changes in pelvic stability suggests that fatigue could be a contributing factor to pelvic compensation. It is recommended that female endurance runners incorporate strength training to strengthen the Gluteal and Hip Flexor muscle groups to reduce pelvic compensation.
{"title":"The importance of gluteal muscle strength in dynamic pelvic stability of fatigued female endurance road runners","authors":"Michelle de Meillon, M. Keegan, Darren Kwong, A. Green","doi":"10.3233/ies-230008","DOIUrl":"https://doi.org/10.3233/ies-230008","url":null,"abstract":"BACKGROUND: Recently there has been a rise in female participation in running yet the female population is under-researched in sport specific research. Locally, many female athletes annually compete in numerous ultra-marathons (> 42 km). OBJECTIVE: This study investigated the importance of Gluteal muscle strength in dynamic pelvic stability of fatigued female endurance road runners. METHODS: Fourteen female endurance runners (age: 38.0 ± 10.12 years, BMI: 21.99 ± 2.37 kg/m2, and VO2max: 40 ± 5.34 ml/min/kg) volunteered for the participation of this study. Through isokinetic testing, muscle strength and fatigability of the Gluteus Maximus, Medius and Minimus was determined. Sign tests compared pelvis stability (unilateral Trendelenburg, Pelvic Bridge test and pelvic stability through a gait analysis) before and after an endurance run on a cambered and flat surface. Participants were divided into two groups based on change in pelvic stability after the fatigue intervention. RESULTS: The unaffected group was moderately younger; lighter in weight and had a lower BMI. Additionally, this group was largely more experienced (p= 0.61, d= 1.341); aerobically fit and ran significantly longer weekly distances (p= 0.002, d= 3.4). There was no statistical difference in isokinetic testing of strength and endurance hip flexion/extension and abduction/adduction between the two groups (p> 0.05). CONCLUSION: In conclusion, the group that was more experienced and ran longer weekly distances showed no change in pelvic stability after an endurance run. However, the group that showed changes in pelvic stability suggests that fatigue could be a contributing factor to pelvic compensation. It is recommended that female endurance runners incorporate strength training to strengthen the Gluteal and Hip Flexor muscle groups to reduce pelvic compensation.","PeriodicalId":54915,"journal":{"name":"Isokinetics and Exercise Science","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45837578","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Aleksandar Borisavljević, Filip Kukić, M. Ćosić, Goran Janković, M. Dopsaj
BACKGROUND: Foam roller with vibration is a recent development and its implementation has not yet been provided with a sufficient scientific justification. Information on whether an implementation of vibration foam rolling for self-massage before the powerful muscular activities is a good strategy is scarce. OBJECTIVE: Therefore, the aim of this study was to determine the acute effects of a single 15-s and 60-s vibrating foam rolling treatment on muscle contractile properties during maximal voluntary isometric contraction (MVIC). METHODS: Twenty healthy and recreationally active subjects participated in this study. During first visit, baseline characteristics were collected, while on the second and third visit they performed a 15-s and a 60-s vibration foam rolling treatment, respectively. Their maximal force (F)max and rate of force development (RFDmax) were assessed using the MVIC of plantarflexors. RESULTS: The RFDmax was negatively affected (p⩽ 0.05) after the 15-s treatment and 60-s treatment, staying reduced even after 10-min of recovery. No significant effects were observed for Fmax. CONCLUSIONS: When implementing vibration foam rolling, either as a pre-workout activity or as a pre-competition treatment, caution should be taken. Short duration treatment should be avoided for activities were RFDmax has a significant impact on performance.
{"title":"Acute effects of vibration foam rolling on the explosive strength properties of the plantarflexors during maximal isometric contraction","authors":"Aleksandar Borisavljević, Filip Kukić, M. Ćosić, Goran Janković, M. Dopsaj","doi":"10.3233/ies-220118","DOIUrl":"https://doi.org/10.3233/ies-220118","url":null,"abstract":"BACKGROUND: Foam roller with vibration is a recent development and its implementation has not yet been provided with a sufficient scientific justification. Information on whether an implementation of vibration foam rolling for self-massage before the powerful muscular activities is a good strategy is scarce. OBJECTIVE: Therefore, the aim of this study was to determine the acute effects of a single 15-s and 60-s vibrating foam rolling treatment on muscle contractile properties during maximal voluntary isometric contraction (MVIC). METHODS: Twenty healthy and recreationally active subjects participated in this study. During first visit, baseline characteristics were collected, while on the second and third visit they performed a 15-s and a 60-s vibration foam rolling treatment, respectively. Their maximal force (F)max and rate of force development (RFDmax) were assessed using the MVIC of plantarflexors. RESULTS: The RFDmax was negatively affected (p⩽ 0.05) after the 15-s treatment and 60-s treatment, staying reduced even after 10-min of recovery. No significant effects were observed for Fmax. CONCLUSIONS: When implementing vibration foam rolling, either as a pre-workout activity or as a pre-competition treatment, caution should be taken. Short duration treatment should be avoided for activities were RFDmax has a significant impact on performance.","PeriodicalId":54915,"journal":{"name":"Isokinetics and Exercise Science","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43303928","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
BACKGROUND: Obesity is thought to be a risk factor for cardiopulmonary diseases due to changed pulmonary mechanics. It also drastically lowers functional capability in both males and females. A routine physiotherapy program has been shown to be effective in the prevention and treatment of cardiopulmonary diseases. It also significantly increases functional capacity following coronary artery bypass grafting. However, the effect of a structured physiotherapy program in obese and non-obese patients has not been well explored. As such, the objective of this study is to determine the effect of a standardized physiotherapy program on pulmonary function and walking capacity in obese and non-obese patients undergoing coronary artery bypass grafting. METHODS: A prospective study was conducted on 50 obese (age 57.2 ± 6.3 Y) and non-obese (age 56.6 ± 5.7 Y) adults who were schedule for coronary artery bypass grafting. Their body mass index was used to separate them into two groups. Both groups followed a structured physiotherapy program from day 1 to day 7 post cardiac surgery. Both groups underwent spirometry test at baseline (preoperatively) and after day 4 and day 7 postoperatively as well as a six-minute walk test at baseline and on day 7 postoperatively. RESULTS: At baseline, obese individuals had significantly lower pulmonary and physical functioning. On postoperative day 4, both groups deteriorated, although the obese group deterioration was worse, in most of the pulmonary parameters. On postoperative day 7, both groups improved, though the non-obese group improved at a faster rate. In contrary, it was observed that the obese group improved more rapidly in terms of functional capacity. CONCLUSIONS: The study indicated that the outcomes of a structured physiotherapy program following coronary artery bypass grafting were different for persons who were obese compared to those who were not. Adipose tissue variations surrounding the rib cage, diaphragm, and visceral cavity may account for the observed rate of change between the two groups. Therefore, it is apparent that a new strategy for managing obese individuals who have undergone CABG is required.
{"title":"The effects of a structured physiotherapy program on pulmonary function and walking capacity in obese and non-obese adults undergoing cardiac surgery","authors":"M. Shaphe","doi":"10.3233/ies-220077","DOIUrl":"https://doi.org/10.3233/ies-220077","url":null,"abstract":"BACKGROUND: Obesity is thought to be a risk factor for cardiopulmonary diseases due to changed pulmonary mechanics. It also drastically lowers functional capability in both males and females. A routine physiotherapy program has been shown to be effective in the prevention and treatment of cardiopulmonary diseases. It also significantly increases functional capacity following coronary artery bypass grafting. However, the effect of a structured physiotherapy program in obese and non-obese patients has not been well explored. As such, the objective of this study is to determine the effect of a standardized physiotherapy program on pulmonary function and walking capacity in obese and non-obese patients undergoing coronary artery bypass grafting. METHODS: A prospective study was conducted on 50 obese (age 57.2 ± 6.3 Y) and non-obese (age 56.6 ± 5.7 Y) adults who were schedule for coronary artery bypass grafting. Their body mass index was used to separate them into two groups. Both groups followed a structured physiotherapy program from day 1 to day 7 post cardiac surgery. Both groups underwent spirometry test at baseline (preoperatively) and after day 4 and day 7 postoperatively as well as a six-minute walk test at baseline and on day 7 postoperatively. RESULTS: At baseline, obese individuals had significantly lower pulmonary and physical functioning. On postoperative day 4, both groups deteriorated, although the obese group deterioration was worse, in most of the pulmonary parameters. On postoperative day 7, both groups improved, though the non-obese group improved at a faster rate. In contrary, it was observed that the obese group improved more rapidly in terms of functional capacity. CONCLUSIONS: The study indicated that the outcomes of a structured physiotherapy program following coronary artery bypass grafting were different for persons who were obese compared to those who were not. Adipose tissue variations surrounding the rib cage, diaphragm, and visceral cavity may account for the observed rate of change between the two groups. Therefore, it is apparent that a new strategy for managing obese individuals who have undergone CABG is required.","PeriodicalId":54915,"journal":{"name":"Isokinetics and Exercise Science","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45867534","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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