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Sensitivity to change of quadriceps and hamstrings muscle wearable electromyography outcomes during a professional soccer match.
IF 2.3 2区 医学
Journal of Sports Sciences Pub Date : 2025-02-21 DOI: 10.1080/02640414.2025.2469462
Rudy N Kalema, Steven J Duhig, Taija Finni, Ashokan Arumugam, Arto J Pesola
{"title":"Sensitivity to change of quadriceps and hamstrings muscle wearable electromyography outcomes during a professional soccer match.","authors":"Rudy N Kalema, Steven J Duhig, Taija Finni, Ashokan Arumugam, Arto J Pesola","doi":"10.1080/02640414.2025.2469462","DOIUrl":"https://doi.org/10.1080/02640414.2025.2469462","url":null,"abstract":"<p><p>Textile electromyography (EMG) was used to investigate neuromuscular activity during professional soccer matches, providing insights into performance optimization and injury prevention. This explorative study aimed to (1) describe the EMG activity of the quadriceps and hamstrings and (2) identify the metrics most sensitive to changes between the first and second half. Seven players (age: 23.1 ± 5.7 years; height: 1.82 ± 0.05 m; weight: 77.6 ± 10 kg) were evaluated. EMG outcomes included EMG amplitude, intensity distribution, and usual bout duration for dominant (D) and non-dominant (N.D) muscles. Hamstring activity averaged 47% (D) and 43% (N.D) of %EMG<sub>MVC</sub>, while quadriceps averaged 32% (D) and 27% (N.D). Most time was spent at the lowest EMG intensity and 13% at the highest intensity. Bout amplitudes (37-54%EMG<sub>MVC</sub>) and durations (14-17s) varied between muscle groups and limbs. The hamstrings' usual EMG bout amplitude (N.D) was the most sensitive, showing a 12% reduction (effect size [ES] = 0.64, <i>p</i> = 0,01). The most substantial percentage change was observed in the hamstrings' duration > 100% EMG<sub>MVC</sub> (D), which decreased by 27% (ES = 0.14, <i>p</i> = 0.57) with other metrics showing smaller reductions. This study highlights the potential of textile EMG to quantify neuromuscular demands during soccer matches, offering valuable tools for performance monitoring and tailored interventions to enhance training and prevent injuries.</p>","PeriodicalId":17066,"journal":{"name":"Journal of Sports Sciences","volume":" ","pages":"1-10"},"PeriodicalIF":2.3,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143468333","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effects of a 4-week weightlifting or plyometric training mesocycle on physical performance in highly trained adolescent basketball players.
IF 2.3 2区 医学
Journal of Sports Sciences Pub Date : 2025-02-19 DOI: 10.1080/02640414.2025.2469023
Borja Ricart-Luna, Fernando Domínguez-Navarro, Javier Gene-Morales, Juan Carlos Colado, Álvaro Juesas, Rubén Portes, Iván Chulvi-Medrano
{"title":"Effects of a 4-week weightlifting or plyometric training mesocycle on physical performance in highly trained adolescent basketball players.","authors":"Borja Ricart-Luna, Fernando Domínguez-Navarro, Javier Gene-Morales, Juan Carlos Colado, Álvaro Juesas, Rubén Portes, Iván Chulvi-Medrano","doi":"10.1080/02640414.2025.2469023","DOIUrl":"https://doi.org/10.1080/02640414.2025.2469023","url":null,"abstract":"<p><p>This study examined the effects of weightlifting (WTG) and plyometric (PTG) training on ankle mobility, strength, power, and running performance in highly trained adolescent basketball players. Participants (male, <i>n</i> = 23; female, <i>n</i> = 35) were randomly assigned to WTG or PTG, training three times weekly for four weeks. Assessments included ankle dorsiflexion, hip strength (ABD-ADD ratio and asymmetry), handgrip strength, lower limb power (Counter Movement Jump -CMJ- and Broad Jump), and running performance. Both interventions significantly improved ankle dorsiflexion (left: <i>p</i> < .001, d = 1.10; right: <i>p</i> < .001, d = 1.50) and hip strength (left adduction: <i>p</i> = .001, d = 0.93; right abduction: F[1,54] = 6.65, <i>p</i> = .013, d = 0.71). The WTG improved right handgrip strength (m.d. 1.76 kg, <i>p</i> = .028, d = 0.23) and CMJ (m.d. 1.81 cm, <i>p</i> = .004, d = 0.30). Both groups improved Broad Jump performance (WTG: m.d. 0.13 m, <i>p</i> = .002, d = 0.46; PTG: m.d. 0.13 m, <i>p</i> = .007, d = 0.47). The PTG showed significant improvement in the Compass Drill (<i>p</i> = .003, d = 0.42). Both interventions have the potential to enhance physical performance, with no clear superiority for one type of training over the other.</p>","PeriodicalId":17066,"journal":{"name":"Journal of Sports Sciences","volume":" ","pages":"1-12"},"PeriodicalIF":2.3,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143449421","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Central and peripheral nervous system activity and muscle oxygenation in athletes during repeated-sprint exercise in normoxia and normobaric hypoxia.
IF 2.3 2区 医学
Journal of Sports Sciences Pub Date : 2025-02-06 DOI: 10.1080/02640414.2025.2461947
Charles W C Simpson, Julia Walter, Steven P Gieseg, Sonja Lackner, Sandra Holasek, Michael J Hamlin
{"title":"Central and peripheral nervous system activity and muscle oxygenation in athletes during repeated-sprint exercise in normoxia and normobaric hypoxia.","authors":"Charles W C Simpson, Julia Walter, Steven P Gieseg, Sonja Lackner, Sandra Holasek, Michael J Hamlin","doi":"10.1080/02640414.2025.2461947","DOIUrl":"https://doi.org/10.1080/02640414.2025.2461947","url":null,"abstract":"<p><strong>Aim: </strong>To investigate central and peripheral nervous system activity and muscle oxygenation in athletes during repeated-sprint exercise in normoxia and normobaric hypoxia.</p><p><strong>Methods: </strong>The effects on vastus lateralis muscle strength in a cross-over study were examined in 18 athletes (13 males, 5 females) completing 10 × 6-s cycle sprints. Immediately after and again 5 minutes post-exercise, electromyography (EMG), heart rate variability, maximal voluntary contraction (MVC), muscle oxygenation, peak power output, and arterial oxygen saturation were compared to 2 baseline sets named (\"Baseline\" and \"Pre\").</p><p><strong>Results: </strong>Post-exercise MVC was significantly lower (6.7 ± 10.0%) than Baseline, but root-mean-square amplitude during hypoxia (all-times) was significantly lower than normoxia (0.38 ± 0.19 vs 0.41 ± 0.17 mV). Comparative frequency analysis of the percentage change in pre- to post-exercise EMG area, at low 1-29 hz (type-1 fibre) and high 75-100 hz (type-2 fibre) areas, revealed a significant reduction in type-1 fibre activity relative to type-2, by 20-30% across time and by 10% in type-1 activity between conditions.</p><p><strong>Conclusion: </strong>Exercise in hypoxia appeared to cause a temporary increase in central sympathetic nervous system activity and greater recruitment of type-2 muscle fibres, with accompanying reduction in type-1. Acute hypoxia may stimulate type-2 fibre conditioning.</p>","PeriodicalId":17066,"journal":{"name":"Journal of Sports Sciences","volume":" ","pages":"1-13"},"PeriodicalIF":2.3,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143256100","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Does team size affect Scottish male academy soccer player technical, locomotor and psychosocial outcomes during age and maturity bio-banded small-sided games?
IF 2.3 2区 医学
Journal of Sports Sciences Pub Date : 2025-02-04 DOI: 10.1080/02640414.2025.2456408
Michael King, Steve Barrett, Ross Mclellan, John Cox, Matthew Brown, Sam Mackenzie, Chirstopher Towlson
{"title":"Does team size affect Scottish male academy soccer player technical, locomotor and psychosocial outcomes during age and maturity bio-banded small-sided games?","authors":"Michael King, Steve Barrett, Ross Mclellan, John Cox, Matthew Brown, Sam Mackenzie, Chirstopher Towlson","doi":"10.1080/02640414.2025.2456408","DOIUrl":"https://doi.org/10.1080/02640414.2025.2456408","url":null,"abstract":"<p><p>The timing of the adolescent growth spurt (i.e. peak height velocity [PHV]) varies greatly, causing significant differences in maturity-related anthropometric and physical development among chronologically age-categorised youth soccer players. These differences can lead to a maturity-selection bias favouring early maturing players. Using fifty-three players from two professional Scottish soccer academies, this study examined the effects of team size (4v4, 5v5, and 6v6) and bio-banding (i.e. grouping players by maturity status) on players technical (i.e. touches, releases, possessions), physical (i.e. distance covered, accelerations/decelerations), and psychological (i.e. confidence, competitiveness, positive attitude) performance during small-sided games, using foot-mounted inertial measurement units (F-IMU) and coach observations. Data were analysed using multivariate ANOVA. During maturity-matched games, technical actions decreased as team size increased. More mature players displayed greater technical actions in 4v4 compared to 6v6. Maturity-mismatched games revealed significant technical action differences for less mature players, particularly in 4v4 formats. More mature players covered greater high-intensity distances in maturity-matched and mismatched 6v6 games. Psychological scores were higher for more mature players in smaller team sizes (4v4), whereas less mature players showed consistent psychological scores across all formats. Smaller team sizes and maturity-matched bio-banding formats enhanced technical actions and psychological characteristics, particularly for more mature players.</p>","PeriodicalId":17066,"journal":{"name":"Journal of Sports Sciences","volume":" ","pages":"1-11"},"PeriodicalIF":2.3,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143189705","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Sub-symptom threshold aerobic exercise improves executive function during the early stage of sport-related concussion recovery.
IF 2.3 2区 医学
Journal of Sports Sciences Pub Date : 2025-02-01 Epub Date: 2025-02-12 DOI: 10.1080/02640414.2025.2453337
Alma Rahimi, Azar Ayaz, Chloe Edgar, Gianna Jeyarajan, Darryl Putzer, Michael Robinson, Matthew Heath
{"title":"Sub-symptom threshold aerobic exercise improves executive function during the early stage of sport-related concussion recovery.","authors":"Alma Rahimi, Azar Ayaz, Chloe Edgar, Gianna Jeyarajan, Darryl Putzer, Michael Robinson, Matthew Heath","doi":"10.1080/02640414.2025.2453337","DOIUrl":"10.1080/02640414.2025.2453337","url":null,"abstract":"<p><p>We examined whether persons with a sport-related concussion (SRC) derive a postexercise executive function (EF) benefit, and whether a putative benefit is related to an exercise-mediated increase in cerebral blood flow (CBF). Participants with an SRC completed the Buffalo Concussion Bike Test to determine the heart rate threshold (HRt) associated with symptom exacerbation and/or voluntary exhaustion. On a separate day, SRC participants - and healthy controls (HC group) - completed 20-min of aerobic exercise at 80% HRt while middle cerebral artery velocity (MCAv) was measured to estimate CBF. The antisaccade task (i.e. saccade mirror-symmetrical to target) was completed pre- and postexercise to evaluate EF. SRC and HC groups showed a comparable exercise-mediated increase in CBF (ps < .001), and both groups elicited a postexercise EF benefit (ps < .001); however, the benefit was unrelated to the magnitude of the MCAv change. Moreover, SRC symptomology was not increased when assessed immediately postexercise and showed a 24 h follow-up benefit. Accordingly, persons with an SRC demonstrated an EF benefit following a single bout of sub-symptom threshold aerobic exercise. Moreover, the exercise intervention did not result in symptom exacerbation and thus demonstrates that a tailored aerobic exercise program may support cognitive and symptom recovery following an SRC.</p>","PeriodicalId":17066,"journal":{"name":"Journal of Sports Sciences","volume":" ","pages":"266-279"},"PeriodicalIF":2.3,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143399446","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Does increasing the resistance-training volume lead to greater gains? The effects of weekly set progressions on muscular adaptations in females.
IF 2.3 2区 医学
Journal of Sports Sciences Pub Date : 2025-02-01 Epub Date: 2025-01-27 DOI: 10.1080/02640414.2025.2459003
Alysson Enes, Camila L Correa, Mauro F Bernardo, Guilherme Nass Salles, Gustavo Oneda, Danilo F Leonel, Steven J Fleck, Stuart M Phillips, Eduardo O De Souza, Tácito P Souza-Junior
{"title":"Does increasing the resistance-training volume lead to greater gains? The effects of weekly set progressions on muscular adaptations in females.","authors":"Alysson Enes, Camila L Correa, Mauro F Bernardo, Guilherme Nass Salles, Gustavo Oneda, Danilo F Leonel, Steven J Fleck, Stuart M Phillips, Eduardo O De Souza, Tácito P Souza-Junior","doi":"10.1080/02640414.2025.2459003","DOIUrl":"10.1080/02640414.2025.2459003","url":null,"abstract":"<p><p>We investigated the effect of increasing the number of sets per week every fortnight versus performing a constant set volume on muscular adaptations over 12 weeks. Thirty females (RT experience 2.1 ± 1.0 years) were randomly assigned to a constant group (CG, <i>n</i> = 9) that performed 22 sets per week, a two-set progression group (2SG, <i>n</i> = 11), or a four-set progression group (4SG, <i>n</i> = 10). Forty-five degree leg press one-repetition maximum (1RM), vastus lateralis cross-sectional area (VL-CSA), and the sum of proximal, middle and distal lateral thigh muscle thickness (∑MT) were assessed at baseline and after the intervention. We observed that the 4SG and 2SG conditions showed greater improvements in 1RM than the CG (<i>p</i> < 0.001, <i>p</i> = 0.032, respectively), with no differences between 4SG and 2SG (<i>p</i> = 0.118). Regarding VL-CSA, the 4SG group showed greater increases than the CG (<i>p</i> = 0.029) but not than the 2SG (<i>p</i> = 0.263), whereas no differences between the 2SG and CG (<i>p</i> = 0.443) were observed. There were no differences between groups for ∑MT (<i>p</i> = 0.783). While all groups demonstrated improvements in the measured outcomes, our findings suggest that increasing weekly sets may offer additional benefits for 1RM and vastus lateralis cross-sectional area. However, no additional benefits were observed for ∑MT.</p>","PeriodicalId":17066,"journal":{"name":"Journal of Sports Sciences","volume":" ","pages":"381-392"},"PeriodicalIF":2.3,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143045927","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Go big or spin fast? Biomechanical deterministic models for snowboard freestyle tricks performed on a trampoline. 做大还是快?在蹦床上表演的滑雪板自由式技巧的生物力学确定性模型。
IF 2.3 2区 医学
Journal of Sports Sciences Pub Date : 2025-02-01 Epub Date: 2025-01-20 DOI: 10.1080/02640414.2025.2453788
Christian Merz, Falk Naundorf, Tom Gorges, Axel Schüler, Steven Pickardt, Matej Supej, Uwe G Kersting
{"title":"Go big or spin fast? Biomechanical deterministic models for snowboard freestyle tricks performed on a trampoline.","authors":"Christian Merz, Falk Naundorf, Tom Gorges, Axel Schüler, Steven Pickardt, Matej Supej, Uwe G Kersting","doi":"10.1080/02640414.2025.2453788","DOIUrl":"10.1080/02640414.2025.2453788","url":null,"abstract":"<p><p>In snowboard freestyle, rotation is the key indicator of trick difficulty, encouraging riders to perform tricks with more rotation. In many cases, snowboarders learn and practice tricks using training tools such as trampolins and/or landingbags before they transfer this tricks on-snow. It has not yet been scientifically investigated which movement parameters are primarily responsible for the acquisistion of increasingly difficult cork tricks. Hence, the aim of this study was to investigate the influence of each theoretically defined performance parameter on the amount of rotation using deterministic models for halfpipe and kicker tricks, separated for the direction of rotation, performed on a trampoline with a bounce board. Kinematic motion tracking was used to determine biomechanical performance parameters of 157 corks performed by 15 riders, and random intercept models were used to develop deterministic models. The results show that regardless of the discipline and direction of rotation, angular velocity, take-off velocity and the moment of inertia are key performance indicators to increase the amount of rotation. The coefficient of determination showed a high goodness-of-fit and the standardized estimate was highly significant for all investigated performance parameters. These results are important for coaches and riders to teach and learn new skills.</p>","PeriodicalId":17066,"journal":{"name":"Journal of Sports Sciences","volume":" ","pages":"299-307"},"PeriodicalIF":2.3,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143007353","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Hemoglobin mass is accurately predicted in endurance athletes. 耐力运动员的血红蛋白质量可以准确预测。
IF 2.3 2区 医学
Journal of Sports Sciences Pub Date : 2025-02-01 Epub Date: 2025-01-16 DOI: 10.1080/02640414.2025.2453347
Przemysław Kasiak, Tomasz Kowalski, Raphaël Faiss, Jadwiga Malczewska-Lenczowska
{"title":"Hemoglobin mass is accurately predicted in endurance athletes.","authors":"Przemysław Kasiak, Tomasz Kowalski, Raphaël Faiss, Jadwiga Malczewska-Lenczowska","doi":"10.1080/02640414.2025.2453347","DOIUrl":"10.1080/02640414.2025.2453347","url":null,"abstract":"<p><p>Hemoglobin mass (Hb<sub>mass</sub>) prediction enhance the accessibility and practicality of athletes' hemoglobin status monitoring, facilitating better performance. Therefore, we aimed to create prediction equations for Hb<sub>mass</sub> in well-trained endurance athletes (EA), based on easily obtained measures. The population of 220 well-trained EA (40% females, maximal oxygen uptake = 63.4 ± 8.00 mL·kg·min<sup>-1</sup>) was randomly split for the models' derivation and validation in 2:1 ratio. Equations to predict total Hb<sub>mass</sub> (tHb<sub>mass</sub>) and Hb<sub>mass</sub> adjusted to fat-free mass (rHb<sub>mass</sub>) were developed with multivariable linear regression. The models were stratified for five complexity levels with the inclusion of anthropometric, biochemical, and fitness indices. Models for tHb<sub>mass</sub> (R<sup>2</sup> = 0.87-0.92; root-mean-square error [RMSE] = 60.6-76.5 g) outperform the models for rHb<sub>mass</sub> (R<sup>2</sup> = 0.28-0.58; RMSE = 1.00-1.26 g·kg<sup>-1</sup>). During internal validation, 9 of 10 of equations accurately predicted tHb<sub>mass</sub> (0.11 ± 54.7-54.8 ± 45.5 g; <i>p</i> = 0.18-0.99) and only 1 model differed significantly (<i>p</i> = 0.03). There were also no significant differences between observed and predicted values in 8 of 10 of equations for rHb<sub>mass</sub> (0.1 ± 1.4-1.0 ± 0.1 g·kg<sup>-1</sup>; <i>p</i> = 0.07-0.65) and 2 models showed significant differences (<i>p</i> = 0.01-0.04). Models present moderate-to-high accuracy. Equations are precise enough to provide complementary data in the epidemiology of diseases with abnormal hemoglobin values, antidoping policy or talent identification. However, they should not substitute direct testing of Hb<sub>mass</sub> in EA.</p>","PeriodicalId":17066,"journal":{"name":"Journal of Sports Sciences","volume":" ","pages":"289-298"},"PeriodicalIF":2.3,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143007355","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Biomechanics of the bobsleigh push phase.
IF 2.3 2区 医学
Journal of Sports Sciences Pub Date : 2025-02-01 Epub Date: 2025-01-28 DOI: 10.1080/02640414.2025.2458983
Marvin Zedler, Bjoern Braunstein, Wolfgang Potthast, Jan-Peter Goldmann
{"title":"Biomechanics of the bobsleigh push phase.","authors":"Marvin Zedler, Bjoern Braunstein, Wolfgang Potthast, Jan-Peter Goldmann","doi":"10.1080/02640414.2025.2458983","DOIUrl":"10.1080/02640414.2025.2458983","url":null,"abstract":"<p><p>The purpose of this work was to provide a fundamental, in-depth analysis of kinematics and kinetics of the bobsleigh push phase to establish a basis for performance analysis and enhancement. Fifteen elite male athletes performed maximal effort push starts, while ground reaction forces (GRF) and 3D marker trajectories were simultaneously recorded for ground contacts of different sub-sections of the push phase (start acceleration phase: first and second ground contact after the initial push-off from the start block, acceleration phase: 10 m and high-velocity phase: 30 m). To obtain a comprehensive view of the push phase, whole-body kinematics as well as joint kinetics were analysed and compared across the push phase. The results showed that propulsion during the start acceleration was hip extensor dominant. With increasing running speed, the contribution to propulsion increased at the ankle and decreased at the knee. In contrast to unresisted sprinting, bobsleigh athletes relied more on mechanical energy generation at the hip than at the ankle, especially during start acceleration. These findings should be considered for the strength and conditioning of bobsleigh athletes and further investigated in relation to a suitable performance measure.</p>","PeriodicalId":17066,"journal":{"name":"Journal of Sports Sciences","volume":" ","pages":"360-369"},"PeriodicalIF":2.3,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143052747","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Barriers and enablers to measuring resting metabolic rate in the high-performance sporting system: A qualitative exploratory study. 在高性能运动系统中测量静息代谢率的障碍和促进因素:一项定性探索性研究。
IF 2.3 2区 医学
Journal of Sports Sciences Pub Date : 2025-02-01 Epub Date: 2025-01-20 DOI: 10.1080/02640414.2025.2453342
Megan A Kuikman, Alannah Ka McKay, Helen Brown, Nicole Townsend, Rachel McCormick, Aimee Morabito, Nikolay Pichshev, Gary Slater, Louise M Burke
{"title":"Barriers and enablers to measuring resting metabolic rate in the high-performance sporting system: A qualitative exploratory study.","authors":"Megan A Kuikman, Alannah Ka McKay, Helen Brown, Nicole Townsend, Rachel McCormick, Aimee Morabito, Nikolay Pichshev, Gary Slater, Louise M Burke","doi":"10.1080/02640414.2025.2453342","DOIUrl":"10.1080/02640414.2025.2453342","url":null,"abstract":"<p><p>Measurements of resting metabolic rate (RMR) may be undertaken for dietary planning purposes or to assess for low energy availability (LEA). This study investigated barriers and enablers to measuring RMR in real-world, high-performance sport environments. Twelve interviews were conducted with technicians (<i>n</i> = 6 dietitians, <i>n</i> = 6 physiologists) employed across six National Institute Networks, two National Sporting Organisations and one professional sporting code. RMR was predominantly measured to screen for LEA with measurements only occurring in a few instances for dietary planning purposes. Data was thematically analysed with six main themes identified. Barriers included lack of confidence in measuring RMR, burden of measurement on athlete and technician, confusion over measurement responsibility, and scepticism in RMR measurements as an indicator of LEA. Subthemes that contributed to scepticism included: the RMR thresholds used to indicate LEA, unanswered research questions, and measurement errors introduced by athlete presentation, testing equipment and/or environment. Enablers to use of RMR measurements included perceived value of RMR measurements as a 'piece of the puzzle' when assessing for LEA and its use as a longitudinal measure. Best practice guidelines for RMR measurements in athletic cohorts must consider these barriers and enablers as they highlight unique characteristics of athletes and their environment.</p>","PeriodicalId":17066,"journal":{"name":"Journal of Sports Sciences","volume":" ","pages":"280-288"},"PeriodicalIF":2.3,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143007351","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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