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Articles 58291 - 58320 of 1792008

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Development And Validation Of An Algorithm For Foot Contact Detection In High-Dynamic Movements Using Inertial Measurement Units, Margherita Mendicino, Stefano Di Paolo, José Miguel Dos Santos, Eline M. Nijmeijer, Pieter Heuvelmans, Francesco Della Villa, Alli Gokeler, Anne Benjaminse, Stefano Zaffagnini Nov 2025

Development And Validation Of An Algorithm For Foot Contact Detection In High-Dynamic Movements Using Inertial Measurement Units, Margherita Mendicino, Stefano Di Paolo, José Miguel Dos Santos, Eline M. Nijmeijer, Pieter Heuvelmans, Francesco Della Villa, Alli Gokeler, Anne Benjaminse, Stefano Zaffagnini

ISBS Proceedings Archive

Wearable IMUs offer a promising alternative to lab-based motion capture for sports biomechanics. Accurate foot contact detection (FCD) is crucial, yet most algorithms are validated for daily activities, leaving a gap in high-dynamic movements, such as sprints and changes of direction, which are linked to injury risk. This study (I) reviews FCD algorithms for such tasks and (II) develops a new IMU-based algorithm for detecting initial contact (IC) and toe-off (TO). The review highlighted limitations in sport-specific FCD solutions. Two algorithms using Pelvis Vertical Velocity (PVV) and Resultant Foot Acceleration (RFA) were tested on 302 trials. A hybrid approach combining …

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Formation Of Coordination Among Release Parameters For The Shape Of Variability In Arrival Positions Over Practice, Ryota Matsuda, Jun Umakoshi, Arata Kimura Nov 2025

Formation Of Coordination Among Release Parameters For The Shape Of Variability In Arrival Positions Over Practice, Ryota Matsuda, Jun Umakoshi, Arata Kimura

ISBS Proceedings Archive

This study aims to propose a framework for analyzing coordination among release parameters in relation to the shape of variability in performance outcomes and to investigate how such coordination is formed through practice. Participants threw 60 darts toward the center of the dartboard, twice a week for 10 weeks. Intersection over Union (IoU) was used to quantify coordination for the shape of variability, and a threshold was established to define the presence of coordination. The results showed that coordination among release parameters was not necessarily developed through practice, and that such coordination may already be structured before reducing the magnitude …

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Effect Of Hamstring Strength Intervention On Lower Extremity Biomechanics Of Sprinting, Shangxiao Li, Weiya Hao, Shufang Yuan Nov 2025

Effect Of Hamstring Strength Intervention On Lower Extremity Biomechanics Of Sprinting, Shangxiao Li, Weiya Hao, Shufang Yuan

ISBS Proceedings Archive

The purpose of this study was to examine the effects of hamstring strength intervention on the lower extremity biomechanics. Fourteen college students volunteered to participate in this study, and underwent three weekly sessions of hamstring strength intervention for eight weeks. Three-dimensional kinematic and kinetic data during a sprint test (40 m) were collected before and after the intervention. The hip flexion angle, knee flexion angle at touch down and peak knee flexion angle instant, and peak knee extension moment during stance phase showed significant decreases in the post-intervention test compared to the pre-intervention test. The hip and knee joints were …

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Shoulder Kinematics Of Overhead Throwing In Male Professional And Semi-Professional Cricketers, Jordan Leondiris Mr., Janine Gray Dr., Megan Dutton Dr., Yumna Albertus Associate Prof. Nov 2025

Shoulder Kinematics Of Overhead Throwing In Male Professional And Semi-Professional Cricketers, Jordan Leondiris Mr., Janine Gray Dr., Megan Dutton Dr., Yumna Albertus Associate Prof.

ISBS Proceedings Archive

Throwing in sports is one of the most aggressive and vigorous actions performed by the upper extremity. The purpose of this study was to investigate overhead throwing shoulder kinematics between two different throwing approaches in cricket, throwing from a static versus dynamic position following a run-up. The study sample included twenty (N=20) male professional/semi-professional cricketers. Shoulder kinematic variables were investigated during two different throwing approaches. Dynamic throwing produced significantly greater ball velocity than static throwing. However, shoulder internal rotation velocities at ball release showed no significant differences across static versus dynamic conditions and shoulder kinematics remained largely consistent, except for …

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The Effect Of Augmented Reality Glasses On Elderly And Young Adults – A Preliminary Study, Sangyup Lee, Melissa Mache, Chengtu Hsieh Nov 2025

The Effect Of Augmented Reality Glasses On Elderly And Young Adults – A Preliminary Study, Sangyup Lee, Melissa Mache, Chengtu Hsieh

ISBS Proceedings Archive

Falls are a major concern among older adults, often linked to gait adaptations influenced by aging and environmental factors. This study examined the effects of augmented reality (AR) glasses on gait in young and older adults under three conditions: walking without AR glasses (W/O), with AR glasses (AR), and with AR glasses while performing a cognitive task (AR + CQ). Twelve participants (six younger, six older) walked on a treadmill at their preferred speed while gait was analysed using OpenCap. Compared to younger adults, older adults exhibited shorter stride length and narrower step width under AR conditions. Younger adults showed …

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Head Impact Differences Between Male And Femal Judo Practitoners During Sparring Practice: A Secondary Analysis Of An Exploratory Study, Sentaro Koshida, Takanori Ishii, Hiroshi Kubota, Tatsunari Hasegawa, Chinami Nakagawara, Hiroshi Churei Nov 2025

Head Impact Differences Between Male And Femal Judo Practitoners During Sparring Practice: A Secondary Analysis Of An Exploratory Study, Sentaro Koshida, Takanori Ishii, Hiroshi Kubota, Tatsunari Hasegawa, Chinami Nakagawara, Hiroshi Churei

ISBS Proceedings Archive

Although judo carries a high risk of head injuries, primarily due to throws, empirical data on head impact characteristics during sparring practice remains limited. This study examined differences between males and females in head impact frequency and magnitude among collegiate judo practitioners. Nine athletes were monitored using mouthguard-type inertial sensors to measure head linear and rotational accelerations during practice. Generalized linear mixed models (GLMMs) estimated that head impact frequency was higher in female practitioners (10.9 impacts/hour; 95% CI: 4.8–25.0) compared to males (3.7 impacts/hour; 95% CI: 1.4–9.5; rate ratio: 2.96, p = 0.09). In contrast, model-estimated peak linear acceleration (PLA) …

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Biomechanical Analysis Of Standing Long Jump For Different Focus Of Attention, Arata Kimura Nov 2025

Biomechanical Analysis Of Standing Long Jump For Different Focus Of Attention, Arata Kimura

ISBS Proceedings Archive

The purpose of this study was to examine the kinematics of the center of mass (COM) under varying attentional focus conditions during the standing long jump. Participants performed jumps under three focus conditions: control, internal focus, and external focus. The findings showed no statistically significant differences in jump distances across conditions. However, for most participants, the shortest jump distance was not observed under the external focus condition. The number of participants who showed the shortest jump distance in the external focus condition was 1 out of 14. These results suggest that external focus of attention can prevent poor jump performance …

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Characterizing Cardiac-Locomotion Synchronization And Heart Rate/Gait Cycle Fluctuations: A Pilot Study, Minato Kawaguchi, Kousuke Meguro, Kentaro Takahashi Nov 2025

Characterizing Cardiac-Locomotion Synchronization And Heart Rate/Gait Cycle Fluctuations: A Pilot Study, Minato Kawaguchi, Kousuke Meguro, Kentaro Takahashi

ISBS Proceedings Archive

This study investigated cardiac-locomotion synchronization (CLS) during indoor treadmill and outdoor free walking, examining its environmental differences and relationships with heart rate/gait rhythm variability. Twelve participants used wearable ECG and accelerometer sensors for data collection during self-paced brisk walking. We analysed the last 10 minutes of stable walking, calculating mean period, coefficient of variation, and detrended fluctuation analysis (DFA) slope α. CLS was quantified by the 'Sync rate', the temporal proportion of consistent gait cycle to R-R interval ratios. Results showed significantly higher Sync rates in outdoor walking. Outdoor gait rhythm fluctuation α tended to decrease with increased Sync rate. …

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Comparison Of Thorax And Pelvis Motion During Iron Club Golf Swing Between Female And Male Skilled Golfers, Karolina Kanova, Jiri Skypala, Pavel Brtva, Roman Farana Nov 2025

Comparison Of Thorax And Pelvis Motion During Iron Club Golf Swing Between Female And Male Skilled Golfers, Karolina Kanova, Jiri Skypala, Pavel Brtva, Roman Farana

ISBS Proceedings Archive

This study compared thorax and pelvis biomechanics in male and female golfers using an iron club, analysing eight skilled golfers (4 female, 4 male) with over 10 years of experience and a handicap below 10. The aim was to compare the biomechanics and movement variability of thorax and pelvis motion during the golf swing between genders. Biomechanical analysis was conducted using a combination of marker-based and markerless motion capture systems, focusing on the downswing. Results showed gender- based differences in 3D angular displacement, with significant movement variability in pelvic lateral tilt across all downswing phases (top of backswing, mid-downswing, and …

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The Stability Of Variability – Multiday Reliability Of Sample Entropy In Submaximal Hop And Strength Tasks In Elite Athletes, Daniel Kadlec, Jake Cowin, Kat Daniels, Matthew J Jordan, Matt Miller-Dicks, Shayne Vial, Sophia Nimphius Nov 2025

The Stability Of Variability – Multiday Reliability Of Sample Entropy In Submaximal Hop And Strength Tasks In Elite Athletes, Daniel Kadlec, Jake Cowin, Kat Daniels, Matthew J Jordan, Matt Miller-Dicks, Shayne Vial, Sophia Nimphius

ISBS Proceedings Archive

The purpose of this study was to determine the multiday reliability in submaximal continuous hops and submaximal isometric squats from the ground reaction force signals. Twelve elite team-sport athletes completed submaximal isometric squats at 40% and 60% of their maximal voluntary isometric contraction and submaximal continuous hopping at 2 Hz, 2.5 Hz, and a self-selected frequency for 30 s, respectively, over four sessions. Sample entropy was calculated from the force-time data. Good-to-excellent reliability (ICC2,k > 0.75) was observed for submaximal hopping frequencies (Hop2.0, Hop2.5) following one session and for isometric squats at 60% MVIC from the initial session. These data …

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Simulating The Effect Of Measurement Error On Stride Time Detrended Fluctuation Analysis, Ben D. M. Jones, David L. Carey, Jon Wheat, Kane Middleton, Ben Heller Nov 2025

Simulating The Effect Of Measurement Error On Stride Time Detrended Fluctuation Analysis, Ben D. M. Jones, David L. Carey, Jon Wheat, Kane Middleton, Ben Heller

ISBS Proceedings Archive

The aim of this study was to investigate the sensitivity of running stride time detrended fluctuation analysis (DFA) to simulated noise and the impact of noise on reliability measures. Varying magnitudes of Gaussian and uniform noise were added to series of touchdown event timings from 11 runners. DFA-α were calculated for ground truth and simulated stride time series. Simulated series were paired and test-retest ICC estimates computed. The error in DFA-α increased with noise magnitude, with stride time series transitioning from persistent to anti-persistent behaviour for greater magnitudes of noise. However, median ICC estimates stayed above 0.95 for all standard …

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Changes In Arm And Leg Swing During A 400 M Sprint, Ryo Iwasaki, Sakie Nobuoka Nov 2025

Changes In Arm And Leg Swing During A 400 M Sprint, Ryo Iwasaki, Sakie Nobuoka

ISBS Proceedings Archive

The present study aimed to clarify the changes in arm and leg swing between the early and late phases of a 400 m sprint. Nine male and eight female sprinters performed a 400 m sprint at maximum effort. Inertial measurement units were attached to the distal thighs and forearms to quantify arm and leg swing. Segmental angular data were analysed and compared between the early and late phases of the sprint. Leg swing amplitude was significantly reduced in the late phase compared to the early phase (average %Δ = -48.8), whereas arm swing amplitude increased (average %Δ = +160.8), and …

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Validity Of A Velocity-Based Training Device For Assessing Peak Force, Velocity, And Power In Medicine Ball Throws: A Pilot Study, Kazuhiro Ishimura Nov 2025

Validity Of A Velocity-Based Training Device For Assessing Peak Force, Velocity, And Power In Medicine Ball Throws: A Pilot Study, Kazuhiro Ishimura

ISBS Proceedings Archive

This pilot study examined the validity of a wearable VBT device for measuring peak velocity, force, and power during vertical medicine ball throws. Two participants each performed nine throws while wearing the device, and a single high-speed camera tracked only the medicine ball. Velocity and power were computed from ball position using video-based analysis. The VBT device showed strong correlations for velocity (r = 0.945, bias = –2.01 ± 1.17 m/s) and force (r = 0.969, bias = –64.16 ± 28.31 N), but power showed a weak correlation (r = 0.150, bias = 277.8 ± 337.1 W) and high variability. …

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Comparison Of Segmental Dynamics Between Soccer Side Volley Kick And Instep Kick, Tsuyoshi Iitake, Hiroyuki Nunome Prof. Nov 2025

Comparison Of Segmental Dynamics Between Soccer Side Volley Kick And Instep Kick, Tsuyoshi Iitake, Hiroyuki Nunome Prof.

ISBS Proceedings Archive

The present study aimed to clarify differences in segmental dynamics between the side-volley kick and the instep kick in soccer. Three-dimensional lower body motion (500 Hz) was captured during both types of kicks of twenty male soccer players. Joint angular velocities, resultant joint torque and interaction torque due to joint reaction forces of the kicking leg were computed using inverse dynamics. Statistical Parametric Mapping was used to compare these time-series changes. Despite the side-volley kick generating significantly smaller hip flexion torque than the instep kick, the hip joint angular velocity of the side-volley kick was comparable to that of the …

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Plantar Fascia Stiffness Accounts For Individual Variance In Its Strain During Hopping At Different Frequencies In Females, Ayaka Hobo, Hiroto Shiotani, Kosuke Hirata, Hiyo Inaba, Natsuki Sado Nov 2025

Plantar Fascia Stiffness Accounts For Individual Variance In Its Strain During Hopping At Different Frequencies In Females, Ayaka Hobo, Hiroto Shiotani, Kosuke Hirata, Hiyo Inaba, Natsuki Sado

ISBS Proceedings Archive

The plantar fascia (PF) behaves like a spring during bouncing gait, whereas its strain is a potential risk factor for plantar fasciitis. PF strain in bouncing gait is determined theoretically by complex foot dynamics, involving numerous active and passive foot structures, but the determinants of its individual variability remain unclear. Here we show the high relevance of PF stiffness to its strain in hopping by 11 females. PF stiffness, assessed as shear wave velocity, correlates with peak PF strain in hopping at different frequencies (1.8, 2.6, 3.4 Hz). The variance accounted for increases with increasing hopping frequency (from 49 to …

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Assessing The Impact Reduction Capabilities Of Gamebreaker Softshell Headgear In Drop Tests, Annette G. Heward-Swale, George Stilwell, Nick Draper, Natalia Kabaliuk Nov 2025

Assessing The Impact Reduction Capabilities Of Gamebreaker Softshell Headgear In Drop Tests, Annette G. Heward-Swale, George Stilwell, Nick Draper, Natalia Kabaliuk

ISBS Proceedings Archive

Softshell headgear is marketed to reduce head impact intensity in contact sports like rugby; however, evidence supporting this remains limited. This study investigated whether selected headgear models, GameBreaker-Pro, a novel GameBreaker-Prototype and a World Rugby (WR) Law 4 approved headgear, attenuate impact intensity under controlled drop test conditions. Peak linear acceleration (PLA), peak rotational acceleration (PRA), and peak rotational velocity (PRV) were measured on a Hybrid III headform fitted with this headgear. Drop tests were conducted from 15-60 cm at five head impact orientations. All headgear reduced impact kinematics relative to the bare headform. GameBreaker headgear achieved 14-22% greater reductions …

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Interaction Between The Midsole And Plate In Running Shoes Modifies The Energy Strategy Of The Mtp Joint During Running, Soo-Ji Han, Jusung Lee, Sanghyuk Han, Seongjun Kim, Jongchul Park Nov 2025

Interaction Between The Midsole And Plate In Running Shoes Modifies The Energy Strategy Of The Mtp Joint During Running, Soo-Ji Han, Jusung Lee, Sanghyuk Han, Seongjun Kim, Jongchul Park

ISBS Proceedings Archive

This study investigated biomechanical differences of the metatarsophalangeal (MTP) joint according to midsole materials (EVA, PEBA) and carbon plate insertion. Ten male runners performed overground running at 3.89 m/s (±5%) under four footwear conditions. Discrete outcome variables included active and critical stiffness (Kactive, Kcr), push-off time, peak propulsion force, and MTP power transition timing, while statistical nonparametric mapping (SnPM) was applied to joint power. PEBA without a plate did not provide a propulsion advantage but reduced energy loss and enabled more effective joint control than EVA. In contrast, the addition of a plate to EVA facilitated a faster roll-off with …

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No Differences Between Males And Females In The Neural Control Of Explosive Contractions, Anna Grootenhuis, Fiona Hiereth, Jakob Škarabot, Marius Oßwald, Alessandro Del Vecchio, Markus Gruber, Luca Ruggiero Dr. Nov 2025

No Differences Between Males And Females In The Neural Control Of Explosive Contractions, Anna Grootenhuis, Fiona Hiereth, Jakob Škarabot, Marius Oßwald, Alessandro Del Vecchio, Markus Gruber, Luca Ruggiero Dr.

ISBS Proceedings Archive

Males and females exhibit comparable explosive relative to maximal strength. Given the greater proportion of type I fibres area in female muscles, motor units discharge rate (MUDR) in explosive efforts may be higher to compensate for slower contractile properties. To verify this, 22 females and 12 males (20-34 y), performed 10 rapid isometric ankle dorsiflexors, while recording high-density electromyography from tibialis anterior. Relative rate of torque development (RTD) measures (normalised to maximal torque) in the first 150 ms from contraction onset were not different (P > 0.07) between sexes, nor MUDR at the beginning of the explosive efforts (61 ± …

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Validating A Markerless Motion Capture Application In Simultaed Snowboarding, Stuart Evans Dr, Christian Merz, Felix Friedl Nov 2025

Validating A Markerless Motion Capture Application In Simultaed Snowboarding, Stuart Evans Dr, Christian Merz, Felix Friedl

ISBS Proceedings Archive

The purpose of the present pilot study was to validate the timing and position accuracy of the centre of mass (COM) during a replicative snowboarding training session using a previously validated motion capture system (Simi Motion®) and a mobile markerless monocular motion capture application (SPLYZA Motion). The positional timing of the two-dimensional (2D) COM motion between the two systems were validated in an indoor laboratory condition as two elite snowboarders performed three individual movements, namely a static (isometric) pose as a proxy method for ground truth validation followed by a vertical jump and a single rotation. The position of the …

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Machine Learning And Deep Learning Applications In Sports Biomechanical Analysis: A Systematic Scoping Review Of Performance Enhancement And Injury Prevention Strategies, Wissem Dhahbi, Nidhal Jebabli, Manar Boujabli, Marouen Souaifi, Ismail Dergaa, Lamia Ben Ezzdine Nov 2025

Machine Learning And Deep Learning Applications In Sports Biomechanical Analysis: A Systematic Scoping Review Of Performance Enhancement And Injury Prevention Strategies, Wissem Dhahbi, Nidhal Jebabli, Manar Boujabli, Marouen Souaifi, Ismail Dergaa, Lamia Ben Ezzdine

ISBS Proceedings Archive

Aim: This scoping review systematically maps current trends in artificial intelligence applications for sports biomechanical analysis, examining performance enhancement and injury prevention utility, methodological approaches, implementation challenges, and ethical considerations. Methods: A comprehensive analysis synthesized evidence on AI methodologies applied to sports biomechanics across various contexts, including machine learning, neural networks, and deep learning approaches integrated with learning management systems. This review examined data collection modes, analytical approaches, and practical implementation in laboratory and field settings. Results: AI applications evolved from basic statistical modeling to sophisticated machine learning configurations, demonstrating superior performance in technique analysis (94% agreement with international judges), …

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Changes In Walking Performance Under Dual Task Conditions Across Pregnancy – A Case Study, Nikola Chmura, Wanda Forczek-Karkosz Nov 2025

Changes In Walking Performance Under Dual Task Conditions Across Pregnancy – A Case Study, Nikola Chmura, Wanda Forczek-Karkosz

ISBS Proceedings Archive

In recent years there is a growing literature on the walking pattern during pregnancy in the context of preventing falls as pregnancy progresses (Błaszczyk et al. 2016). The study examines the impact of pregnancy on walking under dual-task conditions. A 27-year-old participant was assessed in her first and third trimester for gait parameters and cognitive function changes. Results showed slower walking speed, prolonged double support phase, and a wider base of support, especially when performing an additional task. The DIVA test revealed impaired attention and increased errors.Findings highlight the effect of cognitive load on stability in pregnant women, potentially increasing …

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Trunk Kinematics In The Sliding Forehand On Clay Courts: A Comparison Of Elite And Sub-Elite Tennis Players, Kai-Lung Chang, Wen-Tzu Tang, Tsung-Yu Huang, Zi-Jun Lin, Cheng-Yi Hsiao Nov 2025

Trunk Kinematics In The Sliding Forehand On Clay Courts: A Comparison Of Elite And Sub-Elite Tennis Players, Kai-Lung Chang, Wen-Tzu Tang, Tsung-Yu Huang, Zi-Jun Lin, Cheng-Yi Hsiao

ISBS Proceedings Archive

This study compares the trunk kinematics of elite and sub-elite male tennis players during the sliding forehand stroke on clay courts. A total of 24 highly skilled players participated in this study. Their stroke execution was recorded using a 3D high-speed infrared motion capture system. Independent sample t-tests (p < 0.05) were used to compare trunk kinematics between groups. Elite players outperformed their sub-elite counterparts across all measured points, including greater right lateral bending at the Ground Contact and End Backswing points, enhanced anterior tilt at the Impact and Racket Extension points, and superior left lateral bending at the Completion of Swing point. Additionally, their greater maximum trunk displacement reflects superior trunk control and movement efficiency throughout the stroke sequence. This study underscores the importance of trunk rotational control and sliding techniques in optimizing forehand performance on clay courts.

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Within-Session Variability In Treadmill Running Mechanics In Team Sport Athletes, Claire Chaisson, Brian Hanley, Dan Weaving, Stacey Emmonds Nov 2025

Within-Session Variability In Treadmill Running Mechanics In Team Sport Athletes, Claire Chaisson, Brian Hanley, Dan Weaving, Stacey Emmonds

ISBS Proceedings Archive

This study investigated within-session variability in treadmill running mechanics during repeated same-day runs across multiple speeds, with a secondary aim to assess how these mechanics changed with speed. Eleven team sport athletes (9 M, 2 F; 25.0 ± 3.2 years) completed three trials of 30-s treadmill runs at 10, 12, 14, 16, 18 and 20 km/h. The coefficient of variation (CV%) for step length (2.7 to 1.7%, β = -0.10, p = 0.004) and flight time (7.9 to 4.3%, β = -0.41, p < 0.001) decreased with speed, indicating greater consistency. Step length (β = 0.068), step rate (β = 0.054), flight time (β = 3.69) and horizontal work (β = 0.026) increased with speed, and contact time (β = –9.86), duty factor (β = –0.008) and vertical work (β = –0.041) decreased. These findings suggest movement patterns become more consistent at higher speeds.

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The Effects Of A Basketball Game-Based Warm-Up In Squat Jump Performance In Youth Students, Marco V. Campana Bonilla, Mansour N. Alsowayan Nov 2025

The Effects Of A Basketball Game-Based Warm-Up In Squat Jump Performance In Youth Students, Marco V. Campana Bonilla, Mansour N. Alsowayan

ISBS Proceedings Archive

The purpose of this study was to identify the effects of a basketball game-based warm-up (BGW) on squat jump (SJ) performance in youth students. 28 high school participants were included in this study. The participants performed a BGW and completed a SJ pre-test and post-test. A smartphone app was used to test and collect the jump height (JH), flight time (FT), velocity (Vel), force (F), and power (P), which was obtained and calculated using the take-off and landing points by the app from the video recorded taken from the SJ. Our findings showed significant differences for boys in FT (p …

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Acl Injury-Related Kinematic Assessment: A Preliminary Study To Compare Marker-Based, Wearable, And Markerless Systems, Claudia Brunetti, Filippo Bertozzi, Pietro Maver, Marco Palombi, Matilde Santini, Manuela Galli, Marco Tarabini Nov 2025

Acl Injury-Related Kinematic Assessment: A Preliminary Study To Compare Marker-Based, Wearable, And Markerless Systems, Claudia Brunetti, Filippo Bertozzi, Pietro Maver, Marco Palombi, Matilde Santini, Manuela Galli, Marco Tarabini

ISBS Proceedings Archive

Anterior cruciate ligament (ACL) injuries often occur in non-contact situations, highlighting the need for effective risk assessment tools. This study compared kinematic outcomes of IMUs (Xsens), markerless (OpenCap) and an optoelectronic system (OMS) – considered the gold standard - in drop jumps with change of direction. Knee and hip sagittal and frontal plane kinematics were recorded concurrently with all three systems in a total of 260 trials. Xsens showed high validity for knee flexion (R2=0.81, RMSE2=0.00), limiting its use in ACL injury prevention research. OpenCap had weaker agreement with OMS (i.e., for knee flexion R2=0.76, RMSE=7.6°) …

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Bridging The Gap Between Research And Practice: Integrating Biomechanical Analysis In The Development Of Landing Mats In Gymnastics., Pavel Brtva, Bethany Canty, Rebecca Straker, Gareth Irwin, Roman Farana Nov 2025

Bridging The Gap Between Research And Practice: Integrating Biomechanical Analysis In The Development Of Landing Mats In Gymnastics., Pavel Brtva, Bethany Canty, Rebecca Straker, Gareth Irwin, Roman Farana

ISBS Proceedings Archive

This study examined variations in vertical ground reaction force (VGRF) and lower limb kinematics during landings on three different mat structures (TYPE1, TYPE2, TYPE3) compared to FIG mat in young unskilled (pupils) and gymnast’s female. Significant effects of mat type were observed for VGRFmax, time to VGRFmax, peak ankle and knee angles, and peak knee angular velocity. TYPE1 mats exhibited the highest VGRF and shortest time to peak, indicating inadequate force attenuation and potential injury risk. Gymnasts demonstrated lower VGRFmax and lower ankle flexion, likely due to landing technique. No significant differences between TYPE2, TYPE3, …

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A Novel Pathway To Characterise Footballs For Finite Element Analysis, Megan J. Barnes-Wood, Henrique Ramos, Rafael Santiago, Peter Theobald Nov 2025

A Novel Pathway To Characterise Footballs For Finite Element Analysis, Megan J. Barnes-Wood, Henrique Ramos, Rafael Santiago, Peter Theobald

ISBS Proceedings Archive

This study developed a method to characterise materials used in football manufacture for finite element analysis. Quasi-static (0.1/s) and dynamic (10/s and 100/s) uniaxial testing on a FIFA Quality Programme approved football generated hyperelastic material coefficients. Dynamic mechanical analysis was utilised to create Prony series coefficients to inform the viscoelastic behaviour. The model was validated by comparing finite element simulations with experimental data, focusing on dynamic properties including coefficient of restitution, maximum deformation, and contact time. Results indicated a strong correlation, with RMSE between 0.0051 and 10.4310, particularly at 0.8 bar pressure, demonstrating the model’s efficacy for high-strain impacts. This …

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The Effect Of The Eyes-Closed Condition On Muscle Activation, Ground Reaction Force, And 3d Kinematics In Countermovement Jumps, Nada Juma Aldous, Paul Grimshaw Nov 2025

The Effect Of The Eyes-Closed Condition On Muscle Activation, Ground Reaction Force, And 3d Kinematics In Countermovement Jumps, Nada Juma Aldous, Paul Grimshaw

ISBS Proceedings Archive

This study investigates the effects of the eyes-closed condition on lower limb muscle activation, ground reaction force, and three-dimensional kinematics during repeated countermovement jumps in healthy young male adults. Data were collected in a controlled laboratory setting using a force platform, 3D motion capture, and wireless electromyography. The results offer insight into the interplay between sensory re-weighting and motor control under altered visual conditions. While key performance parameters remain largely consistent between eyes-open and eyes-closed trials, subtle differences in joint kinematics suggest compensatory adaptations may occur. These findings contribute to a better understanding of sensory integration in dynamic motor tasks …

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Velocity-Based Training Intervention: Effects On Lower Limb Performance In Female Floorball Athletes, Basil Achermann, Naire Regazzi, Rahel Heynen, Julia Suter, Silvio Lorenzetti Nov 2025

Velocity-Based Training Intervention: Effects On Lower Limb Performance In Female Floorball Athletes, Basil Achermann, Naire Regazzi, Rahel Heynen, Julia Suter, Silvio Lorenzetti

ISBS Proceedings Archive

This study investigated the effects of a six-week velocity-based training (VBT) program in female floorball players. The intervention, focused on back squats and trap bar deadlifts. Key performance metrics included movement velocity of RT exercises, sprint speed, jump performance, stop-and-go (SAG) performance, and load-velocity profiles (LVP). Seventeen participants completed 12 training sessions divided into strength (Sessions 1–6) and power (Sessions 7–12) blocks. Significant improvements were observed in VBT metrics, with squat estimated 1RM increasing by 15.3% (from 1.60 to 1.85) and deadlift estimated 1RM by 5.9% (from 1.76 to 1.87), while mean concentric velocity rose by 7.5% in the squat …

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Isbs 2025 Conference Proceedings, Rony Ibrahim, Paul Grimshaw, Lina Majed, Philip Graham-Smith Nov 2025

Isbs 2025 Conference Proceedings, Rony Ibrahim, Paul Grimshaw, Lina Majed, Philip Graham-Smith

ISBS Proceedings Archive

These are the proceedings of the 43rd Conference of the International Society of Biomechanics in Sport

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