Sports Biomechanics最新文献

Automated rowing event assignment: a machine learning approach. 自动赛艇项目分配：一种机器学习方法。

IF 2 3区医学

Sports Biomechanics Pub Date : 2025-07-11 DOI: 10.1080/14763141.2025.2528885

Yumeng Li, Rachel M Koldenhoven, Nigel C Jiwan, Jieyun Zhan, Ting Liu

{"title":"Automated rowing event assignment: a machine learning approach.","authors":"Yumeng Li, Rachel M Koldenhoven, Nigel C Jiwan, Jieyun Zhan, Ting Liu","doi":"10.1080/14763141.2025.2528885","DOIUrl":"https://doi.org/10.1080/14763141.2025.2528885","url":null,"abstract":"The purpose of the study was to assign rowers to different rowing events based on their demographics and rowing kinematics using machine learning models. A total of 55 elite athletes from the Chinese National Rowing Team participated, each instructed to row on a rowing ergometer for one minute at three stroke rates: 18, 26, and 32 strokes/min. Trunk and upper arm 3D kinematics were collected using an inertia measurement unit system at a sampling rate of 100 Hz. Trunk and upper arm segmental and joint range of motion were generated. Trunk segments and upper arm motion coordination were analysed using the vector coding method. Six supervised machine learning models were trained using the collected demographics and kinematic data to classify rowers' groups (i.e. coxed eight and single/pair event group). The machine learning models successfully classified rowers' groups, with the top-performing models (decision tree, extreme gradient boosting, and random forest) achieving high classification performance (accurate rate = 0.89-0.93). The rowing event assignment automated by machine learning may help coaches make more informed and objective decisions. By minimising subjective biases, this approach enhances the accuracy and fairness of athlete selection processes, thereby potentially optimising team composition and performance outcomes.","PeriodicalId":49482,"journal":{"name":"Sports Biomechanics","volume":" ","pages":"1-13"},"PeriodicalIF":2.0,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144610165","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Effect of taping on multi-segmental foot biomechanical mechanics during the running in chronic ankle instability. 慢性踝关节不稳患者跑步过程中胶布对多节段足部生物力学的影响。

IF 2 3区医学

Sports Biomechanics Pub Date : 2025-07-11 DOI: 10.1080/14763141.2025.2526694

Wenjing Quan, Huiyu Zhou, Datao Xu, Yaodong Gu

{"title":"Effect of taping on multi-segmental foot biomechanical mechanics during the running in chronic ankle instability.","authors":"Wenjing Quan, Huiyu Zhou, Datao Xu, Yaodong Gu","doi":"10.1080/14763141.2025.2526694","DOIUrl":"https://doi.org/10.1080/14763141.2025.2526694","url":null,"abstract":"The study aimed to investigate the effects of different lengths of kinesiology tape (KT) on multi-segment foot biomechanical variables in individuals with chronic ankle instability (CAI). Kinematic and kinetic data were collected using a ten-camera Vicon motion capture system (200 Hz) and a force plate (1000 Hz). Twenty participants with CAI ran under three different conditions: no KT (NT), short KT (ST), and long KT (LT). A five-segment foot model was used, which has 8 degrees of freedom. The results indicated that CAI individuals running with KT might decrease the subtalar eversion angle and Chopart oblique angle during the stance phase. Differences in joint moments were observed at the ankle and subtalar joints during the running stance phase, with smaller ankle plantarflexion and inversion subtalar joint moments in the LT condition compared to the NT and ST conditions. Furthermore, LT was found to decrease the ankle ligament force and increased the force of lateral gastrocnemius muscle, soleus, peroneus longus, and peroneus brevis in individuals with CAI during the stance phase. These findings suggest that KT might reduce ankle ligament force and the risk of ankle sprains in individuals with CAI during running.","PeriodicalId":49482,"journal":{"name":"Sports Biomechanics","volume":" ","pages":"1-24"},"PeriodicalIF":2.0,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144610166","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Do partners influence each other during assisted flights from acrobatic gymnastics? 在杂技体操辅助飞行过程中，伙伴之间是否会相互影响？

IF 2 3区医学

Sports Biomechanics Pub Date : 2025-07-10 DOI: 10.1080/14763141.2025.2527346

Isaura Leite, Luis Mochizuki, Luis Arturo Gómez-Landero, Lurdes Ávila Carvalho, João Paulo Vilas-Boas, Márcio Goethel, Filipe Conceição

{"title":"Do partners influence each other during assisted flights from acrobatic gymnastics?","authors":"Isaura Leite, Luis Mochizuki, Luis Arturo Gómez-Landero, Lurdes Ávila Carvalho, João Paulo Vilas-Boas, Márcio Goethel, Filipe Conceição","doi":"10.1080/14763141.2025.2527346","DOIUrl":"https://doi.org/10.1080/14763141.2025.2527346","url":null,"abstract":"In Acrobatic Gymnastics, base and top gymnasts collaborate to perform partner-assisted flight. According to the literature, individuals engaged in pair/group tasks influence each other's movements to achieve a common goal. This study investigates similarity, time delay and relationship between base and top movements. It also examines distinct time frames-the motion until take-off versus until the end of the rotation, task difficulty and experience level. Eleven pairs performed two pair tasks in laboratory settings and were divided into less and more experienced groups. Cross-correlation (to assess movement similarity and time delay) and Granger causality (to evaluate mutual influence) were applied to the resultant centre of mass position of both gymnasts. The effects of time frame, task difficulty and experience level were analysed. Cross-correlation results show very high correlation coefficients (.98), with no effects from experience and task difficulty. Granger causality results indicate variations in predictive behaviour across conditions, particularly concerning the time frame and the effect of the task for the top gymnast, but did not provide evidence of causality. In conclusion, gymnasts perform highly similar and synchronised motion, with no clear evidence of direct influence, regardless of task difficulty or experience level.","PeriodicalId":49482,"journal":{"name":"Sports Biomechanics","volume":" ","pages":"1-15"},"PeriodicalIF":2.0,"publicationDate":"2025-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144602081","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Estimation of lower limb joint moments using consumer realistic wearable sensor locations and deep learning - finding the balance between accuracy and consumer viability. 使用消费者真实可穿戴传感器位置和深度学习估计下肢关节力矩-在准确性和消费者可行性之间找到平衡。

IF 2 3区医学

Sports Biomechanics Pub Date : 2025-07-09 DOI: 10.1080/14763141.2025.2526702

Joshua Carter, X Chen, D Cazzola, G Trewartha, E Preatoni

{"title":"Estimation of lower limb joint moments using consumer realistic wearable sensor locations and deep learning - finding the balance between accuracy and consumer viability.","authors":"Joshua Carter, X Chen, D Cazzola, G Trewartha, E Preatoni","doi":"10.1080/14763141.2025.2526702","DOIUrl":"https://doi.org/10.1080/14763141.2025.2526702","url":null,"abstract":"We used raw data from wearable sensors in consumer-realistic locations (replicating watch, arm phone strap, chest strap, etc.) to estimate lower-limb sagittal-plane joint moments during treadmill running and assessed the effect of a reduced number of sensor locations on estimation accuracy. Fifty mixed-ability runners (25 men and 25 women) ran on a treadmill at a range of speeds and gradients. Their data was used to train Long Short-Term Memory (LSTM) models in a supervised fashion. Estimation accuracy was evaluated by comparing model outputs against the criterion signals, calculated from marker-based kinematics and instrumented treadmill kinetics via inverse dynamics. The model that utilised data from all sensor locations achieved the lowest estimation error with a mean relative Root Mean Squared Error (rRMSE) of 12.1%, 9.0%, and 6.7% at the hip, knee, and ankle, respectively. Reducing data input to fewer sensors did not greatly compromise estimation accuracy. For example, a wrist-foot sensor combination only increased estimation error by 0.8% at the hip, and 1.0% at the knee and ankle joints. This work contributes to the development of a field-oriented tool that can provide runners with insight into their joint-level net moment contributions whilst leveraging data from their possible existing wearable sensor locations.","PeriodicalId":49482,"journal":{"name":"Sports Biomechanics","volume":" ","pages":"1-16"},"PeriodicalIF":2.0,"publicationDate":"2025-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144592732","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Machine learning-based classification of Taekwondo Poomsae side kick performance using kinematic parameters and physical characteristics. 基于机器学习的跆拳道扑空侧踢动作运动学参数和物理特征分类。

IF 2 3区医学

Sports Biomechanics Pub Date : 2025-07-08 DOI: 10.1080/14763141.2025.2525557

Ui-Jae Hwang, Sung-Hoon Jung, Ho-Chul Ji, Sil-Ah Choi, In-Ju Bang

{"title":"Machine learning-based classification of Taekwondo Poomsae side kick performance using kinematic parameters and physical characteristics.","authors":"Ui-Jae Hwang, Sung-Hoon Jung, Ho-Chul Ji, Sil-Ah Choi, In-Ju Bang","doi":"10.1080/14763141.2025.2525557","DOIUrl":"https://doi.org/10.1080/14763141.2025.2525557","url":null,"abstract":"To develop and validate machine learning (ML) models for classifying Taekwondo Poomsae side kick (SK) performance using kinematic parameters and physical function characteristics. Forty collegiate Taekwondo Poomsae athletes performed SKs with both legs. Two models were developed: a kinematic model incorporating SK and pelvic tilt angles at face and maximal heights, and a physical function model including range of motion measurements and Y-balance test scores. Performance quality was assessed by an expert evaluator using standardised criteria. Five ML algorithms were tested, and their performance was evaluated using area under the curve (AUC) analysis. Random forest classifiers demonstrated excellent performance in both models (kinematic model: AUC = 0.930, accuracy = 89.3%; physical function model: AUC = 0.930, accuracy = 89.3%). In the kinematic model, SK angle at maximal height emerged as the strongest predictor. For the physical function model, Y-balance test composite score showed the largest impact. These findings represent a substantial improvement over conventional subjective assessment methods by providing quantifiable, objective classification with high accuracy. ML algorithms can effectively classify Taekwondo SK performance using both kinematic and physical function parameters. SK angle at maximal height and dynamic balance emerged as the most important predictors in their respective models, providing quantitative criteria for performance assessment.","PeriodicalId":49482,"journal":{"name":"Sports Biomechanics","volume":" ","pages":"1-20"},"PeriodicalIF":2.0,"publicationDate":"2025-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144585412","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

A comparison of reactive strength in elite and sub-elite male and female Australian footballers. 澳大利亚优秀和次优秀男女足球运动员反应力量的比较。

IF 2 3区医学

Sports Biomechanics Pub Date : 2025-07-08 DOI: 10.1080/14763141.2025.2524349

Benjamin M Southey, Lachlan P James, Mark J Connick, Damien J Austin, Brandon M Wellington, Matthew J Green, Tannath J Scott, Dirk R Spits, Emma M Beckman

{"title":"A comparison of reactive strength in elite and sub-elite male and female Australian footballers.","authors":"Benjamin M Southey, Lachlan P James, Mark J Connick, Damien J Austin, Brandon M Wellington, Matthew J Green, Tannath J Scott, Dirk R Spits, Emma M Beckman","doi":"10.1080/14763141.2025.2524349","DOIUrl":"https://doi.org/10.1080/14763141.2025.2524349","url":null,"abstract":"Reactive Strength Index (RSI) correlates to locomotor performance, hence an important strength quality to develop in Australian footballers (AF). However, two common tests, the drop jump (DJ) and 10/5 repeated jump (RJ), have been suggested to reflect different qualities. Therefore, the aim was to compare RSI between the DJ and RJ. Additionally, AF cohort comparisons were made to observe impacts of competition level and sex on RSI. RJ, DJ and Isometric Mid-Thigh Pull (IMTP) tests amongst elite male (AFL, n = 21), female (AFLW, n = 19), and sub-elite male (U18B, n = 19) and female (U18G, n = 19) cohorts were explored over three testing sessions. Coefficient of determination and spearman's rank correlation compared relationships between RJ, DJ and IMTP. Analysis of variance was used to compare strength qualities across AF cohorts. p < 0.05. Results found DJ and RJ had low shared variance (r2) 0.32. Furthermore, cohort comparisons found significant competition level and sex differences between reactive strength qualities. This study found that the RJ and DJ represent different reactive strength qualities, with differences in age and sex found in both. Therefore, both DJ and RJ should be considered when holistically examining reactive strength in AF, and the reactive quality ratio can highlight these relative differences.","PeriodicalId":49482,"journal":{"name":"Sports Biomechanics","volume":" ","pages":"1-14"},"PeriodicalIF":2.0,"publicationDate":"2025-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144585411","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Comparative analysis of measurement systems and methods for force and velocity determinations in loaded and unloaded vertical jumps. 加载和卸载垂直跳跃力和速度测量系统和方法的比较分析。

IF 2 3区医学

Sports Biomechanics Pub Date : 2025-07-04 DOI: 10.1080/14763141.2025.2511759

Valentina Silva-Pereyra, Carlo M Biancardi, Gabriel Fábrica

{"title":"Comparative analysis of measurement systems and methods for force and velocity determinations in loaded and unloaded vertical jumps.","authors":"Valentina Silva-Pereyra, Carlo M Biancardi, Gabriel Fábrica","doi":"10.1080/14763141.2025.2511759","DOIUrl":"https://doi.org/10.1080/14763141.2025.2511759","url":null,"abstract":"Vertical force and velocity are key elements for evaluating jump performance. This study investigated the measurement agreement of force and velocity computed from kinetics, using a force platform, and from kinematics, using a motion capture system, during unloaded and loaded (+20% of body weight) vertical jumps. Synchronized kinetics and kinematics recordings were taken from 23 young basketball players while performing countermovement jumps (CMJ) and squat jumps (SJ). Five measurement of force and nine of velocity were analysed to evaluate the impact of different approaches on results interpretation. Results were compared within groups, intra class correlation and Bland-Altman analyses. Our result showed that loaded conditions did not affect the force estimation through double differentiation of kinematics data, however in SJ a systematic error appeared. Motion capture system and force platform disagreements on different velocity computations were detected, which increased in loaded conditions. Also, we observed a low agreement between a theorical approach of velocity estimation and force platform. Our findings indicate a disparity in measurement agreement of vertical force and velocity across alternative computation techniques and conditions (loads and vertical jump type), and therefore care must be taken while choosing a methodology for evaluating these important variables.","PeriodicalId":49482,"journal":{"name":"Sports Biomechanics","volume":" ","pages":"1-17"},"PeriodicalIF":2.0,"publicationDate":"2025-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144561736","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

The My Jump Lab application is a valid and reliable low-cost alternative to test curved sprint performance. My Jump Lab应用程序是测试弯曲冲刺性能的有效可靠的低成本替代方案。

IF 2 3区医学

Sports Biomechanics Pub Date : 2025-06-30 DOI: 10.1080/14763141.2025.2524344

Alberto Fílter, Jesús Olivares-Jabalera, Jose Vicente Beltrán-Garrido, Alfredo Santalla, Carlos Balsalobre-Fernández, Javier Gálvez, Blanca De-la-Cruz-Torres

{"title":"The My Jump Lab application is a valid and reliable low-cost alternative to test curved sprint performance.","authors":"Alberto Fílter, Jesús Olivares-Jabalera, Jose Vicente Beltrán-Garrido, Alfredo Santalla, Carlos Balsalobre-Fernández, Javier Gálvez, Blanca De-la-Cruz-Torres","doi":"10.1080/14763141.2025.2524344","DOIUrl":"https://doi.org/10.1080/14763141.2025.2524344","url":null,"abstract":"Curved sprinting has been proposed as a relevant and specific skill for soccer players' physical performance. However, professional timing systems are not always readily available in less resource-constrained environments. To address this issue, the development of a low-cost and user-friendly smartphone application could have practical applications for team sports staffs. In this context, the objective of this study was to evaluate the validity and reliability of the My Jump Lab application for the measurement of the curved sprint performance test. Correlational, comparative, and Bland-Altman analyses were conducted to assess the validity and reliability of the application in comparison with the gold-standard device. The results demonstrated excellent concurrent validity (r = 0.97-0.99, p < 0.001), and acceptable reliability (coefficient of variation < 3%, intraclass correlation coefficient = 0.88-0.96). Bland-Altman plots revealed small biases (-0.015 s and -0.010 s for the 17-m and 8.5 m curved sprints, respectively) and narrow 95% limits of agreement (-0.04 to 0.01 s and -0.03 to 0.01 s), indicating string agreement and no heteroskedasticity. Although small but significant differences were observed between test and retest sessions (p < 0.05), the overall findings support that My Jump Lab is a valid and reliable tool for assessing completion time during the curved sprint test in the specified arc, offering a cost-effective alternative for applied sport settings.","PeriodicalId":49482,"journal":{"name":"Sports Biomechanics","volume":" ","pages":"1-12"},"PeriodicalIF":2.0,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144530717","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Thoracoabdominal breathing pattern across exercise intensity domains: performance level insights in cyclists. 跨运动强度域的胸腹呼吸模式：骑自行车者的表现水平见解。

IF 2 3区医学

Sports Biomechanics Pub Date : 2025-06-15 DOI: 10.1080/14763141.2025.2513474

Ana Luiza de Castro Lopes, Karine Jacon Sarro, Isabella Martins Rodrigues, Gustavo Ramos Dalla Bernardina, Filipe Antônio de Barros Sousa, Natália de Almeida Rodrigues, Carlo Massaroni, Emiliano Schena, Sergio Silvestri, Pietro Cerveri, Amanda Piaia Silvatti

{"title":"Thoracoabdominal breathing pattern across exercise intensity domains: performance level insights in cyclists.","authors":"Ana Luiza de Castro Lopes, Karine Jacon Sarro, Isabella Martins Rodrigues, Gustavo Ramos Dalla Bernardina, Filipe Antônio de Barros Sousa, Natália de Almeida Rodrigues, Carlo Massaroni, Emiliano Schena, Sergio Silvestri, Pietro Cerveri, Amanda Piaia Silvatti","doi":"10.1080/14763141.2025.2513474","DOIUrl":"https://doi.org/10.1080/14763141.2025.2513474","url":null,"abstract":"Thoracoabdominal breathing pattern (THA) can be influenced by factors such as exercise intensity, postural demands, and individual variability, which could be associated with performance level. The present study aims to investigate the THA of cyclists with different performance levels during increasing exercise intensity. Fourteen male professional cyclists performed resting breathing manoeuvres and a step-incremental test on a cycle ergometer. Physiological responses were monitored using a metabolic gas analyser and were then classified into two groups: Higher and Lower VO2max. THA was recorded with an optoelectronic system. The contribution to tidal volume and the coordination of three compartments, namely superior thorax (ST), inferior thorax (IT), and abdomen (AB), were calculated. Higher VO2max group demonstrated a stable contribution across all intensity thresholds. Lower VO2max group increased the AB contribution by approximately 9% at both ventilatory thresholds from the start, while the rib cage contribution (ST + IT) decreased by approximately 17% from quiet breathing to exercise (p < 0.005). Coordination between ST vs. AB and IT vs. AB showed significant differences, with the Lower VO2max group demonstrating lower values and a greater effect size compared to the Higher VO2max group (p < 0.005). The present study provides valuable insights into how athletes of different performance levels employ distinct patterns of THA.","PeriodicalId":49482,"journal":{"name":"Sports Biomechanics","volume":" ","pages":"1-16"},"PeriodicalIF":2.0,"publicationDate":"2025-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144303383","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Influence of lower limb asymmetry on the two-handed backhand stroke in female tennis players. 下肢不对称对女子网球运动员双手反手击球的影响。

IF 2 3区医学

Sports Biomechanics Pub Date : 2025-06-13 DOI: 10.1080/14763141.2025.2511762

Kai-Lung Chang, Wen-Tzu Tang, Mu-Lin Tai, Duane V Knudson, Tsung-Yu Huang

{"title":"Influence of lower limb asymmetry on the two-handed backhand stroke in female tennis players.","authors":"Kai-Lung Chang, Wen-Tzu Tang, Mu-Lin Tai, Duane V Knudson, Tsung-Yu Huang","doi":"10.1080/14763141.2025.2511762","DOIUrl":"https://doi.org/10.1080/14763141.2025.2511762","url":null,"abstract":"This study explored the influence of lower limb asymmetry on the kinematic characteristics of the tennis two-handed backhand (2HB) stroke in skilled female players. It included 14 right-handed tennis players. Lower limb symmetry was assessed using the hurdle step test (HDS) from the Functional Movement Screen (FMS™). Based on the results, participants were divided into two groups: eight in the symmetric (SYM) group and six in the asymmetric (ASYM) group. Motion capture cameras recorded both groups performing backhand strokes. Data were analysed to measure linear and angular displacement of the trunk and lower limb segments throughout the preparation, acceleration, and follow-through phases. Differences in selected mean kinematics were assessed using independent t-tests. The ASYM group demonstrated a less closed stance in the initial backswing, less linear movement towards the left, and greater dependence on internal rotation of the left hip during acceleration The ankle having greater external rotation, resulted in more leg twist. The ASYM group also exhibited a greater forward lean at impact, with the follow-through characterised by continued forward lean, and greater leftward movement of both the trunk and lower limbs. SYM and ASYM grouping resulted in 11 significant mean differences in 2HB kinematics. Lower extremity symmetry assessed in the HDS task in skilled female tennis players may be an indicator of trunk, pelvis, and lower extremity technique in the 2HB.","PeriodicalId":49482,"journal":{"name":"Sports Biomechanics","volume":" ","pages":"1-17"},"PeriodicalIF":2.0,"publicationDate":"2025-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144286937","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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