Sports Biomechanics最新文献_第9页

Adapting the percentage intensity method to assess accelerations and decelerations in football: moving beyond absolute and arbitrary thresholds. 采用百分比强度法评估足球运动中的加速度和减速度：超越绝对阈值和任意阈值。

IF 2 3区医学

Sports Biomechanics Pub Date : 2024-08-27 DOI: 10.1080/14763141.2024.2393188

Hugo Silva, Fábio Yuzo Nakamura, Fabio R Serpiello, João Ribeiro, Paulo Roriz, Rui Marcelino

{"title":"Adapting the percentage intensity method to assess accelerations and decelerations in football: moving beyond absolute and arbitrary thresholds.","authors":"Hugo Silva, Fábio Yuzo Nakamura, Fabio R Serpiello, João Ribeiro, Paulo Roriz, Rui Marcelino","doi":"10.1080/14763141.2024.2393188","DOIUrl":"https://doi.org/10.1080/14763141.2024.2393188","url":null,"abstract":" We adapted the percentage intensity approach to monitor accelerations and decelerations allowing players' individualisation. Forty-two players were monitored during four microcycles via global navigation satellite system devices. Raw velocity and time data were collected to calculate acceleration and deceleration magnitudes according to specific starting speed intervals, and the efforts intensities were established as very low (<25% of the maximal effort), low (25-50%), moderate (50-75%) and high (>75%). Linear regressions and Pearson correlation (r) analysed the relationship between maximal efforts and starting speeds; additionally, mean paired differences compared efforts magnitudes between subsequent starting speed intervals. Most very low intensity accelerations (86%) and decelerations (79%) started from <5 km.h-1. Correlation between maximal efforts and starting speeds were r = -0.97 (p < .001) for acceleration, and r = -0.94 (p < .01) for deceleration. Maximal acceleration decreased as starting speed increases (very large effect sizes), but deceleration is less starting speed dependent (unclear to large effect sizes). This adaptation allows practitioners to individualise accelerations and decelerations classification during real-life scenarios, leading to a more precise training prescription. The very low intensity interval could be excluded to consider only relevant efforts. Maximal acceleration should be collected for each starting speed interval because accelerations are starting speed dependents.","PeriodicalId":49482,"journal":{"name":"Sports Biomechanics","volume":" ","pages":"1-12"},"PeriodicalIF":2.0,"publicationDate":"2024-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142082349","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

Are there differences in the kinetic parameters of the vertical jump performed by beach volleyball players on different types of sand? 沙滩排球运动员在不同类型的沙地上进行垂直起跳的运动参数是否存在差异？

IF 2 3区医学

Sports Biomechanics Pub Date : 2024-08-27 DOI: 10.1080/14763141.2024.2394803

Francisco O Neto, Geovani M Silva, Mário A M Simim, Túlio Banja, Filipa Sousa, Pedro Fonseca, Márcio Goethel, Ricardo Romero, Karla de Jesus, Alexandre I A Medeiros

{"title":"Are there differences in the kinetic parameters of the vertical jump performed by beach volleyball players on different types of sand?","authors":"Francisco O Neto, Geovani M Silva, Mário A M Simim, Túlio Banja, Filipa Sousa, Pedro Fonseca, Márcio Goethel, Ricardo Romero, Karla de Jesus, Alexandre I A Medeiros","doi":"10.1080/14763141.2024.2394803","DOIUrl":"https://doi.org/10.1080/14763141.2024.2394803","url":null,"abstract":"Beach volleyball (BV) is an intermittent sport characterised by short-duration and highly demanding activities with low intensity periods. Establishing if players' jump ability is influenced by sand granulometry is a useful information for sport scientists, coaches and players. This study aimed to assess the possible differences in the kinetics parameters of the vertical jump on different types of sand performed by BV players. Twelve elite female players performed six countermovement jumps (CMJs) in three different surface conditions (fine sand, reference, coarse sand) in a random counterbalanced order (216 jumps). A generalised mixed model approach detected differences for CMJ model in total duration (p: 0.016), eccentric phase duration (p: 0.007), concentric phase duration (p: 0.011), time to peak power (p: < 0.001), time to peak force (p: 0.014), maximum rate force development concentric phase (p: 0.004), maximum velocity (p: 0.028) and peak power eccentric (p: 0.018). Coarse sand decreases the time spent jumping compared to fine sand, without a penalty to jump height. Coaches and athletes should take this information into account to enhance their understanding of practice strategies and game conditions. One might anticipate a faster pace in games played on coarse sand and a slower pace on fine sand.","PeriodicalId":49482,"journal":{"name":"Sports Biomechanics","volume":" ","pages":"1-10"},"PeriodicalIF":2.0,"publicationDate":"2024-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142082415","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 biomechanical comparison of track spikes with advanced footwear technology to a traditional track spike in female distance runners. 采用先进鞋类技术的田径钉鞋与传统田径钉鞋在女性长跑运动员中的生物力学比较。

IF 2 3区医学

Sports Biomechanics Pub Date : 2024-08-27 DOI: 10.1080/14763141.2024.2393199

Christina Geisler, J J Hannigan

{"title":"A biomechanical comparison of track spikes with advanced footwear technology to a traditional track spike in female distance runners.","authors":"Christina Geisler, J J Hannigan","doi":"10.1080/14763141.2024.2393199","DOIUrl":"https://doi.org/10.1080/14763141.2024.2393199","url":null,"abstract":"The addition of highly responsive lightweight foam and a stiff plate in the midsole of long-distance road racing shoes has yielded significant energetic cost savings that have translated to notable improvements in performance. This new foam and stiff plate technology have since been implemented in long-distance track spikes, where performances have also improved. However, the impact of spikes with advanced footwear technology (AFT) on distance running biomechanics has been studied minimally to date. Therefore, the purpose of this study was to compare running biomechanics between two spikes which incorporate AFT (Nike ZoomX Dragonfly, Nike Air Zoom Victory) to a traditional spike (Nike Zoom Matumbo). Seventeen competitive collegiate female runners completed 60 m trials at their 5k race pace in each spike condition while outfitted with IMU sensors and plantar pressure insoles. We observed significantly lower peak ankle dorsiflexion in the Dragonfly and Victory compared to the Matumbo and lower whole foot, forefoot and rearfoot peak and average pressure in the Dragonfly compared to the Matumbo and Victory. The acute biomechanical alterations observed in this study warrant future investigation into the association between running biomechanics and racing performance in track spikes with advanced footwear technology.","PeriodicalId":49482,"journal":{"name":"Sports Biomechanics","volume":" ","pages":"1-13"},"PeriodicalIF":2.0,"publicationDate":"2024-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142082348","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

How take-off technique affects muscle demand in the back handspring step out in female gymnasts. 起飞技术如何影响女子体操运动员后手翻跨出的肌肉需求。

IF 2 3区医学

Sports Biomechanics Pub Date : 2024-08-20 DOI: 10.1080/14763141.2024.2388578

Gabriella H Small, Richard R Neptune

{"title":"How take-off technique affects muscle demand in the back handspring step out in female gymnasts.","authors":"Gabriella H Small, Richard R Neptune","doi":"10.1080/14763141.2024.2388578","DOIUrl":"https://doi.org/10.1080/14763141.2024.2388578","url":null,"abstract":"When performing the back handspring step out (BHS) on the balance beam, most gymnasts use one of three take-off techniques: Simultaneous Flexion, Sequential Flexion or Double-Bounce. However, it remains unclear which technique results in the lowest muscle demand that could help reduce energy expenditure and fatigue and improve overall performance. The purpose of this study was to use musculoskeletal modelling and simulation to quantify the influence of take-off technique on muscle demand (integrated muscle power) and contributions to the critical biomechanical functions of whole-body angular momentum generation and control and trunk propulsion (mechanical power delivered to the trunk). Simulations of female gymnasts (n = 21; age: 15.3 ± 3.6) were generated using their self-selected BHS technique on a balance beam. Differences in muscle demand were small across the techniques. However, the vasti, ankle plantarflexors, gluteus maximus and hamstring muscle groups experienced large demand during the BHS take-off. The gluteus medius and ankle plantarflexors were crucial for maintaining balance. The hamstrings, ankle plantarflexors and vasti generated needed momentum and delivered power to the trunk. These results provide targets for muscle strengthening and conditioning to improve balance control and increase the height and distance of the BHS, which is needed before adding additional skills in combination.","PeriodicalId":49482,"journal":{"name":"Sports Biomechanics","volume":" ","pages":"1-15"},"PeriodicalIF":2.0,"publicationDate":"2024-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142005698","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

Agreement between an automated video-based system and tethered system to measure instantaneous swimming velocity. 自动视频系统与系留系统测量瞬时游泳速度的一致性。

IF 2 3区医学

Sports Biomechanics Pub Date : 2024-08-15 DOI: 10.1080/14763141.2024.2388572

Michelle Scott, Nathan Elsworthy, Victoria Brackley, Marc Elipot, Crystal O Kean

{"title":"Agreement between an automated video-based system and tethered system to measure instantaneous swimming velocity.","authors":"Michelle Scott, Nathan Elsworthy, Victoria Brackley, Marc Elipot, Crystal O Kean","doi":"10.1080/14763141.2024.2388572","DOIUrl":"https://doi.org/10.1080/14763141.2024.2388572","url":null,"abstract":"Successful performance in competitive swimming requires a swimmer to maximise propulsion and minimise drag, which can be assessed using instantaneous swimming velocity. Many systems exist to quantify velocity, and therefore, it is important to understand the agreement between systems. This study examined the agreement between an automated video-based system and a tethered system to measure instantaneous velocity. Twenty-two competitive swimmers (state level or higher) completed 25 m of each stroke at maximal intensity. The tethered speedometer was attached to the swimmer's waist, while videos of each trial were recorded. The swimmer's head was then automatically tracked using proprietary software, and instantaneous velocity was determined from each system. Bland-Altman plots showed good agreement between the two systems in backstroke (95% Limits of Agreement (LOA): -0.24-0.26 m.s-1) and freestyle (95% LOA: -0.36-0.38 m.s-1) but poorer agreement in butterfly (95% LOA: -0.51-0.53 m.s-1) and breaststroke (95% LOA: -0.88-0.92 m.s-1). The root mean square error was higher in butterfly (0.27 m.s-1) and breaststroke (0.46 m.s-1) compared to backstroke (0.13 m.s-1) and freestyle (0.19 m.s-1). Results demonstrated that the two systems are comparable for measuring instantaneous swimming velocity; however, larger discrepancies are evident for butterfly and breaststroke.","PeriodicalId":49482,"journal":{"name":"Sports Biomechanics","volume":" ","pages":"1-13"},"PeriodicalIF":2.0,"publicationDate":"2024-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141983691","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

Adjustment of segmental rotations to achieve both racket speed and accuracy at various impact heights during a two-handed backhand stroke. 在双手反手击球过程中，调整分段旋转以实现不同击球高度下的球拍速度和准确性。

IF 2 3区医学

Sports Biomechanics Pub Date : 2024-08-08 DOI: 10.1080/14763141.2024.2388562

Sichao Zhang, Natsuki Sado, Norihisa Fujii

{"title":"Adjustment of segmental rotations to achieve both racket speed and accuracy at various impact heights during a two-handed backhand stroke.","authors":"Sichao Zhang, Natsuki Sado, Norihisa Fujii","doi":"10.1080/14763141.2024.2388562","DOIUrl":"https://doi.org/10.1080/14763141.2024.2388562","url":null,"abstract":"This study investigated the influence of impact height and competitive level on racket speed and stroke accuracy by analysing segmental angular kinematics under a random ball condition. High- (HQ, n = 7) and low-quality (LQ, n = 7) groups were determined by k-means clustering of the ratio of ball landing in the target (accuracy) and racket speed decrease. HQ showed higher accuracy (48.3% vs. 32.4%), less speed decrease at lower impact heights (-4.4% vs. -10.3%) and better competitive level ranking [median (1st-3rd quartiles); 4 (2-7)] than LQ [10 (8-13)]. HQ produced greater racket speed (24.4 vs. 21.6 m/s), especially with a notable horizontal velocity (23.8 vs. 20.8 m/s) of the racket at lower impact height, which was attributed to the central role of greater angular velocity of pelvis and thorax in the hitting direction. Both groups showed similar adjustment mechanisms that due to the decrease in angular velocity of pelvis, players increased the relative rotation angle between pelvis and thorax to maintain angular velocity of thorax when transitioning from low to high impact heights. Our findings suggest that players should emphasise the coordination between pelvic and thoracic rotations according to impact heights to maintain racket speed while controlling ball landing position.","PeriodicalId":49482,"journal":{"name":"Sports Biomechanics","volume":" ","pages":"1-16"},"PeriodicalIF":2.0,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141908165","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

Inertial measurement units to estimate drag forces and power output during standardised wheelchair tennis coast-down and sprint tests. 在标准化轮椅网球滑行和冲刺测试中，利用惯性测量装置估算阻力和动力输出。

IF 2 3区医学

Sports Biomechanics Pub Date : 2024-08-01 Epub Date: 2021-04-26 DOI: 10.1080/14763141.2021.1902555

Thomas Rietveld, Barry S Mason, Victoria L Goosey-Tolfrey, Lucas H V van der Woude, Sonja de Groot, Riemer J K Vegter

{"title":"Inertial measurement units to estimate drag forces and power output during standardised wheelchair tennis coast-down and sprint tests.","authors":"Thomas Rietveld, Barry S Mason, Victoria L Goosey-Tolfrey, Lucas H V van der Woude, Sonja de Groot, Riemer J K Vegter","doi":"10.1080/14763141.2021.1902555","DOIUrl":"10.1080/14763141.2021.1902555","url":null,"abstract":"The purpose of this study was to describe and explore an inertial measurement unit-based method to analyse drag forces and external power loss in wheelchair tennis, using standardised coast-down and 10 m sprint tests. Drag forces and power output were explored among different wheelchair-athlete combinations and playing conditions (tyre pressure, court-surface). Eight highly trained wheelchair tennis players participated in this study. Three inertial measurement units (IMUs) were placed on the frame and axes of the wheels of their wheelchair. All players completed a set of three standardised coast-down trials and two 10 m sprints with different tyre pressures on hardcourt surface. One athlete completed additional tests on a clay/grass tennis-court. Coast-down based drag forces of 4.8-7.2 N and an external power loss of 9.6-14.4 W at a theoretical speed of 2 m/s were measured on hardcourt surface. A higher tyre pressure led to lower drag forces during coast-down tests on hardcourt surface (Fr (4) = 10.7, p = 0.03). For the single athlete, there was an external power loss of 10.4, 15.6 and 49.4 W, respectively, for the hardcourt, clay and grass. The current prediction of power output was implemented during coast-down testing; unfortunately, the power prediction during 10 m sprints was difficult to accomplish.","PeriodicalId":49482,"journal":{"name":"Sports Biomechanics","volume":" ","pages":"968-986"},"PeriodicalIF":2.0,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"38906283","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

Skill level and the free moment during a pistol aiming task. 技能水平和手枪瞄准任务中的空闲时间。

IF 2 3区医学

Sports Biomechanics Pub Date : 2024-08-01 Epub Date: 2021-04-19 DOI: 10.1080/14763141.2021.1903071

Ji-Hyun Ko, Dong-Wook Han, Karl M Newell

引用次数: 0

Greater explosive quadriceps strength is associated with greater knee flexion at initial contact during landing in females. 女性股四头肌爆发力越强，着地时膝关节的屈曲度就越大。

IF 2 3区医学

Sports Biomechanics Pub Date : 2024-08-01 Epub Date: 2021-04-06 DOI: 10.1080/14763141.2021.1908413

Marc F Norcross, Roy Almog, Yu-Lun Huang, Eunwook Chang, Kimberly S Hannigan, Samuel T Johnson

{"title":"Greater explosive quadriceps strength is associated with greater knee flexion at initial contact during landing in females.","authors":"Marc F Norcross, Roy Almog, Yu-Lun Huang, Eunwook Chang, Kimberly S Hannigan, Samuel T Johnson","doi":"10.1080/14763141.2021.1908413","DOIUrl":"10.1080/14763141.2021.1908413","url":null,"abstract":"This study investigated the influences of explosive quadriceps strength and landing task on sagittal plane knee biomechanics. Forty female participants performed isometric knee extensions on a dynamometer and had lower extremity biomechanics assessed during double-leg jump-landings (DLJL) and single-leg jump-cuts (SLJC). Explosive quadriceps strength was quantified by calculating rate of torque development (RTD) between torque onset and 100 ms after onset on a dynamometer. Participants were stratified into high and low RTD groups. Landing biomechanics were compared using 2 (Group) × 2 (Task) mixed-model ANOVAs. The relationships between quadriceps RTD and landing biomechanics were also assessed using simple, bivariate correlations. Across RTD groups, greater knee flexion at initial contact (KFIC), peak vertical ground reaction force, peak anterior tibial shear force, and peak internal knee extension moment, and lesser peak knee flexion was observed during SLJC compared to DLJL. The high RTD group exhibited significantly greater KFIC than the low RTD group across landing tasks. Greater quadriceps RTD was significantly associated with greater KFIC during SLJC, but not during DLJL. As landing with lesser KFIC is a risk factor for ACL injury, greater explosive quadriceps strength capacity might be beneficial for facilitating the use of safer landing mechanics during athletic tasks.","PeriodicalId":49482,"journal":{"name":"Sports Biomechanics","volume":" ","pages":"1028-1042"},"PeriodicalIF":2.0,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"25566065","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

Brain trauma characteristics for lightweight and heavyweight fighters in professional mixed martial arts. 职业综合格斗中轻量级和重量级拳手的脑损伤特征。

IF 2 3区医学

Sports Biomechanics Pub Date : 2024-08-01 Epub Date: 2021-05-19 DOI: 10.1080/14763141.2021.1922740

Ali Khatib, Andrew Post, Thomas Hoshizaki, Michael D Gilchrist

{"title":"Brain trauma characteristics for lightweight and heavyweight fighters in professional mixed martial arts.","authors":"Ali Khatib, Andrew Post, Thomas Hoshizaki, Michael D Gilchrist","doi":"10.1080/14763141.2021.1922740","DOIUrl":"10.1080/14763141.2021.1922740","url":null,"abstract":"Mixed martial arts (MMA) is a sport where the fighters are at high risk of brain trauma, with characteristics, such as the frequency, magnitude, and interval of head impacts influencing the risk of developing short- and long-term negative brain health outcomes. These characteristics may be influenced by weight class as they may have unique fighting styles. The purpose of this research was to compare frequency, magnitude, and interval of head impacts between lightweight and heavyweight fighters in professional MMA. Frequency, interval, event type, velocity, and location of head impacts were documented for 60 fighters from 15 Lightweight and 15 Heavyweight professional MMA fights. Head impact reconstructions of these events were performed using physical and finite element modelling methods to determine the strain in the brain tissues. The results found that LW and HW fighters sustained similar head impact frequencies and intervals. The LW fighters sustained a significantly higher frequency of very low and high magnitude impacts to the head from punches; HW a larger frequency of high category strains from elbow strikes. These brain trauma profiles reflect different fight strategies and may inform methods to manage and mitigate the long-term effects of repetitive impacts to the head.","PeriodicalId":49482,"journal":{"name":"Sports Biomechanics","volume":" ","pages":"1083-1105"},"PeriodicalIF":2.0,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"38916621","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