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Influence Of Lean Body Mass Distribution On Ground Reaction Force And Snatch Performance In Male And Female Weightlifters, Wandasun Sihanath, Nayun Ahn, Paula Papanek, Kristof Kipp Jul 2024

Influence Of Lean Body Mass Distribution On Ground Reaction Force And Snatch Performance In Male And Female Weightlifters, Wandasun Sihanath, Nayun Ahn, Paula Papanek, Kristof Kipp

ISBS Proceedings Archive

The purpose of this study was to determine the influence of lean mass distribution (LMD) on ground reaction forces (GRF) and snatch performance. Eighteen weightlifters completed dual x-ray absorptiometry scans and performed heavy snatch lifts on force plates. Leg and trunk LMD were correlated with snatch performance, but further analysis revealed that only leg LMD was a significant predictor for male weightlifters. GRF during the first pull were associated with performance for male weightlifters, while GRF during the second pull were more relevant for female weightlifters. Leg LMD was a strong predictor of GRF during both pulls with an emphasis …

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Load-Velocity Behavior During The First And Second Pull Of The Snatch And Clean, Emma L. Patterson, Nayun Ahn, Kristof Kipp Jul 2024

Load-Velocity Behavior During The First And Second Pull Of The Snatch And Clean, Emma L. Patterson, Nayun Ahn, Kristof Kipp

ISBS Proceedings Archive

The purpose of the study was to examine the effect of barbell load on the velocity during the first and second pull of the snatch and clean. Fifteen elite weightlifters (M= 6, F = 9) performed multiple repetitions of the snatch and clean at 75%-100% of their one-repetition max. Load-velocity (L-V) regression models were created for the first pull and second pull for each of the two lifts. The slopes of the L-V relationships were extracted from each model to determine how load affects each pull of the corresponding lifts. The results suggested that the L-V slopes for the snatch …

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Examining The Sequencing Of Joint Velocities During Tennis Serves, Parunchaya Jamkrajang, Karl Newell, David Jessop, Hans Von Lieres Und Wilkau, Gareth Irwin Jul 2024

Examining The Sequencing Of Joint Velocities During Tennis Serves, Parunchaya Jamkrajang, Karl Newell, David Jessop, Hans Von Lieres Und Wilkau, Gareth Irwin

ISBS Proceedings Archive

This study examined the sequencing of the euclidian joint velocity and joint angular velocity when performing the tennis serve at the individual level. 10 International level players (male and female) performed 40 maximum serves to 4 target locations. A motion capture system recorded the kinematics of the service action (200 Hz). A descriptive analysis demonstrated sequencing of the euclidian joint velocity and the joint angular velocity, changed as a function of service position. The results showed the same pattern from the highest to lowest order: peak wrist, elbow, shoulder, and hip for the euclidian joint velocity and joint angular velocity, …

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Exploring Knee Biomechanics In Defensive Sports: A Comparative Study Of Forward And Backpedal Sidestep Cuts With And Without A Knee Brace, Taliah Carlson, Zachary Jenkins, Joshua T. Weinhandl Jul 2024

Exploring Knee Biomechanics In Defensive Sports: A Comparative Study Of Forward And Backpedal Sidestep Cuts With And Without A Knee Brace, Taliah Carlson, Zachary Jenkins, Joshua T. Weinhandl

ISBS Proceedings Archive

Cutting, a key movement in dynamic sports, is associated with increased anterior cruciate ligament injuries. The influence of knee braces, commonly used for injury prevention, on knee mechanics requires further analysis. The purpose of this study was to examine the impact of knee braces on knee biomechanics during forward and backpedal cutting. Ten healthy males performed forward and backpedal cutting tasks, with and without a dual-hinged brace, simulating offensive and defensive movements. Compared to forward cuts, backpedal cuts showed increased knee flexion and decreased abduction and internal rotation. Knee internal extension moments and adduction moments increased, while knee internal rotation …

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Markerless Biomechanical Analysis Of Former Elite Rhythmic Gymnasts, Natalie Mendelson, Tomer Yona, Smadar Peleg, Ophir Ravina, Arielle Fischer Jul 2024

Markerless Biomechanical Analysis Of Former Elite Rhythmic Gymnasts, Natalie Mendelson, Tomer Yona, Smadar Peleg, Ophir Ravina, Arielle Fischer

ISBS Proceedings Archive

This study addresses the critical gap in understanding the biomechanics of key rhythmic gymnastics elements with high loads on the feet and ankles, specifically Fouetté balance and turns. These elements require repeated plantar and dorsiflexion movements. The study analyzed the forces and ankle sagittal angles of four former elite gymnasts using markerless motion capture and force plates. We segmented each movement into distinct biomechanical phases, particularly in 'Relevé' and Plié positions. Higher forces were observed during the Fouetté turn, and higher plantarflexion angles were found during the Fouetté balance. To the authors best knowledge this is the first study to …

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“Super-Shoes” In Distance Running: Is There A Possible Downside In Trained Women?, Max R. Paquette, Eduardo Martinez Jul 2024

“Super-Shoes” In Distance Running: Is There A Possible Downside In Trained Women?, Max R. Paquette, Eduardo Martinez

ISBS Proceedings Archive

Although “super-shoes” provide a metabolic advantage, anecdotal suggest that consistent wear may contribute to development of knee and hip overuse injuries. The purpose of this study was to compare these injury-related running biomechanics variables between “super-shoes” and traditional training shoes in female distance runners. 18 competitive female runners ran for 5min on a treadmill at 3.6 m/s in “super-shoes” (SUPER) and control shoes (CON) while 3D kinematic and ground reaction force data were collected. Peak knee abduction moment and peak hip internal rotation and abduction moment were larger in SUPER compared to CON but no other biomechanical variables were different …

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Ai-Based Markerless Single-Camera Motion Analysis For Estimating Knee And Hip Joint Kinematics During Gait, Michael Schwenk, Philipp Barzyk, Alina Boden, Daniel Seebacher, Philip Zimmermann, Manuel Stein, Markus Gruber Jul 2024

Ai-Based Markerless Single-Camera Motion Analysis For Estimating Knee And Hip Joint Kinematics During Gait, Michael Schwenk, Philipp Barzyk, Alina Boden, Daniel Seebacher, Philip Zimmermann, Manuel Stein, Markus Gruber

ISBS Proceedings Archive

This study aimed to pilot-test a markerless motion analysis approach (i.e., SMARTGAIT) for estimating knee and hip joint kinematics in the sagittal and frontal plane during overground walking. One person (age 24 years) walked four times over an 8-meter distance. Joint kinematics were measured using SMARTGAIT (single RGB smartphone camera) and Vicon (reference system). Angle trajectories of sixteen gait cycles were used for the analysis. Agreement between SMARTGAIT and Vicon angle trajectories was greater in the sagittal plane (hip: Pearson’s r=0.989; knee: r=0.990; root mean square error [RMSE] ≤2.6 deg) compared to the frontal plane (hip: r=0.789; knee: r=0.793; RMSE …

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The Effects Of Restricting Thorax Motion During Fixed-Seat Ergometer Rowing, Cecilia Severin, Danise Bentivoglio, Laura Gastaldi, Gertjan Ettema, Jørgen Danielsen Jul 2024

The Effects Of Restricting Thorax Motion During Fixed-Seat Ergometer Rowing, Cecilia Severin, Danise Bentivoglio, Laura Gastaldi, Gertjan Ettema, Jørgen Danielsen

ISBS Proceedings Archive

This study assessed the biomechanical effects of restricted thorax motion during fixed-seat ergometer rowing. Eleven able-bodied participants performed 2 bouts of 4 minutes of submaximal rowing on a custom-made fixed seat. First, the participants were strapped at the waist, allowing thorax motion (“Free thorax”), then strapped around the chest, preventing thorax motion (“Fixed thorax”). Kinematic analysis and force exerted on the ergometer chain were recorded. The “Fixed thorax” setup had lower total power output (p=0.011, Cohen’s d=1.61), total average joint power (p=0.006, Cohen’s D d=1.32) and VO2 (p=0.005, Cohen’s d=2.00). No differences existed in the elbow and shoulder power …

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Differences In Rugby Place Kicking Technique And Performance Between Youth And Senior Players, Jesse Gilham, Alexandra Atack, Jamie North, Ryan Mahaffey Jul 2024

Differences In Rugby Place Kicking Technique And Performance Between Youth And Senior Players, Jesse Gilham, Alexandra Atack, Jamie North, Ryan Mahaffey

ISBS Proceedings Archive

The purpose of this study was to present normative place kicking data for youth players and compare them to senior players. Ten male players (seven youth, three senior) performed supra-maximal range place kicks on an outdoor, grass pitch. Ball trajectory was tracked to determine performance, and lower-body and torso kinematic data were analysed using XSens IMUs for each kicker’s three longest attempts. Youth and senior kickers achieved comparable kick distances. No differences were seen in kicking leg kinematics between groups, however, youth kickers demonstrated greater stance knee extension and greater centre of mass deceleration (mean differences: 4.8° and 0.51 m/s …

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The Effect Of Touchdown Kinematics On Forward Acceleration In The Skeleton Push Start, Marvin Zedler, Celina Schenk, Bjoern Braunstein, Wolfgang Potthast, Jan Goldmann Jul 2024

The Effect Of Touchdown Kinematics On Forward Acceleration In The Skeleton Push Start, Marvin Zedler, Celina Schenk, Bjoern Braunstein, Wolfgang Potthast, Jan Goldmann

ISBS Proceedings Archive

Producing forward acceleration in a bent-over position while pushing a sled is poorly understood. Therefore, the purpose of this study was to investigate body and segment orientation of 16 elite skeleton athletes for the ground contacts 1 to 3 after the start and after 15 m as well as to quantify their relation to forward acceleration. Kinematic and kinetic data were recorded indoor on an athletics track whilst the athletes were pushing a sled dummy along guiding rails. Trunk and thigh orientation remained similar during the acceleration phase, while changes in touchdown kinematics originated from the shank and foot segment. …

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Do Female Weightlifters Snatch Differently? Analysis Of Barbell Kinematics Using Statistical Parametric Mapping, Ingo Sandau, Andrea Rudloff Jul 2024

Do Female Weightlifters Snatch Differently? Analysis Of Barbell Kinematics Using Statistical Parametric Mapping, Ingo Sandau, Andrea Rudloff

ISBS Proceedings Archive

This study aimed to analyse gender differences in barbell kinematics of the snatch in international elite weightlifters. At the 2019 Senior World Championships, horizontal and vertical barbell kinematics of the 1RM snatch lifts of the top 5 female and male weightlifters of all 10 body weight categories were assessed using two-dimensional video analysis (50 Hz). Gender differences were analysed for kinematic time series data using statistical parametric mapping. Results revealed almost similar mean snatch barbell trajectory and velocity pattern for female compared to male weightlifters. Significant differences were detected during the 1st pull with lower barbell distance and velocity. However, …

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Power Up The Swing: A Biomechanical Study Towards A Golf Exosuit, Alireza Nasirzadeh, Song Min Lee, Jihye Jang, Nakwon Ko, Kim Jin Hee, Yong Ung Kwon, Giuk Lee Jul 2024

Power Up The Swing: A Biomechanical Study Towards A Golf Exosuit, Alireza Nasirzadeh, Song Min Lee, Jihye Jang, Nakwon Ko, Kim Jin Hee, Yong Ung Kwon, Giuk Lee

ISBS Proceedings Archive

This biomechanical study investigates the impact of a passive elastic exoband on golf swing performance, focusing on optimizing the timing and magnitude of its stretch to increase the clubhead velocity. We analyzed the performance of two professional golfers wearing the exoband in four configurations. Our findings suggest that pre-stretching the exoband during the backswing, coupled with an optimal X-factor, significantly increases clubhead velocity by efficiently releasing stored elastic energy. Notably, the configuration pulling the left posterior shoulder towards the left ASIS resulted in the highest clubhead velocity and greatest exoband contribution, demonstrating the importance of optimal stretch and energy transfer …

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The Correlation Between Lumbopelvic Control And Pitching Velocity In Baseball Pitchers, Shiu-Min Wang, Wei-Li Hsu, Jyh-How Huang, Yuh-Renn Wu Jul 2024

The Correlation Between Lumbopelvic Control And Pitching Velocity In Baseball Pitchers, Shiu-Min Wang, Wei-Li Hsu, Jyh-How Huang, Yuh-Renn Wu

ISBS Proceedings Archive

The purpose of this study was to investigate the relationship between lumbopelvic control and pitching performance among baseball pitchers. Four baseball pitchers participated in this pilot study. Each participant underwent measurements for lumbopelvic control ability in static posture and dynamic movement, as well as pitching performance assessments. The results indicated a significant correlation between lumbopelvic control in the static posture of the stride leg and pitching velocity (Rs = -1.0, p < 0.01), as well as a significant correlation between lumbopelvic control in dynamic movement and pitching velocity (Rs = - 0.90, p = 0.04). Therefore, lumbopelvic control during pitching could play a pivotal role in enhancing pitching velocity. Coaches and practitioners should prioritize strategies aimed at improving these aspects to …

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Analysing Gait Transition Dynamics In Uphill Trail Running From Wearable Devices, Raimundo Sanchez Jul 2024

Analysing Gait Transition Dynamics In Uphill Trail Running From Wearable Devices, Raimundo Sanchez

ISBS Proceedings Archive

This study investigates gait transition speed in trail running on uphill slopes using wearable devices data. It examines Preferred Transition Speed (PTS) and Heart Rate Optimal Transition Speed (HROTS), noting a decrease in both with increasing slope. This suggests an intuitive adaptation among athletes to lower speeds on steeper inclines, challenging the Iso-Efficient Speed concept and showing gait selection is influenced by more than energy efficiency. The analysis of data from 14 trail runners, aged 22-43 with at least one year of trail running experience, reveals distinct gait patterns characterized by a bimodal distribution in cadence and a unimodal distribution …

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A Simple Jumping Landing Stability Errors System To Differentiate And Diagnose Chronic Ankle Instability, Zongchen Hou, Daniel D.P. Fong, Samantha L. Winter Jul 2024

A Simple Jumping Landing Stability Errors System To Differentiate And Diagnose Chronic Ankle Instability, Zongchen Hou, Daniel D.P. Fong, Samantha L. Winter

ISBS Proceedings Archive

This study investigates whether a simplified landing stability error system can differentiate individuals with chronic ankle instability (CAI). Fifteen CAI and fifteen healthy controls performed jumping landing tasks when instructed with the landing side before (planned) or after (unplanned) take-off. Landing errors were identified as the following criteria: (1) touching the ground with the free leg, (2) standing leg leaving the force plate after landing, (3) touching the ground with the hands, and (4) lateral deviation of sternum over hips. The CAI group had a higher total error (1.70±0.65 times/trial) compared to the normal group (0.89±0.58 times/trial), with a cut-off …

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Pelvic List Strength As An Indicator Of Sprint Performance, Ryu Nagahara, Kento Yoneta Jul 2024

Pelvic List Strength As An Indicator Of Sprint Performance, Ryu Nagahara, Kento Yoneta

ISBS Proceedings Archive

This study aimed to develop a new test for evaluating pelvic list strength and to clarify whether the test would be an indicator of sprint performance. The new pelvic list strength test evaluated the vertical ground reaction force produced by maximal pelvic list using a force plate which was set underneath the supporting foot. For the experiment, 14 male sprinters performed 60-m sprint and the pelvic list strength test. The pelvic list strength test values were 6.05 ± 1.36 [N/kg] and 6.07 ± 1.02 [N/kg] for the right and left sides, respectively. Significant correlations were found between the right pelvic …

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Automated Rower Assignment To Rowing Events: A Machine Learning Approach, Yumeng Li, Rachel Koldenhoven, Nigel Jiwan, Jieyun Zhan, Ting Liu Jul 2024

Automated Rower Assignment To Rowing Events: A Machine Learning Approach, Yumeng Li, Rachel Koldenhoven, Nigel Jiwan, Jieyun Zhan, Ting Liu

ISBS Proceedings Archive

The purpose was to assign rowers to different rowing events based on their demographics and rowing kinematics using machine learning models. 55 elite athletes were instructed to row on a rowing ergometer for one minute at three stroke rates. Trunk, pelvis, and shoulder 3D kinematics were collected using an IMU 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 demographic and kinematic features to classify rowers’ groups. …

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Impact Of Forefoot Cushioning Stiffness On Block Start Performance In Sprinting, Yannick Denis, Hannah Knoke, Mario Kanjuh, Luca Braun, Markus Hipper, Bastian Anedda, Janina Helwig, Steffen Willwacher Jul 2024

Impact Of Forefoot Cushioning Stiffness On Block Start Performance In Sprinting, Yannick Denis, Hannah Knoke, Mario Kanjuh, Luca Braun, Markus Hipper, Bastian Anedda, Janina Helwig, Steffen Willwacher

ISBS Proceedings Archive

This study aimed to identify the impact of different forefoot cushioning properties in “advanced spiked footwear” on sprinting performance during the block start. Kinetic parameters were collected for twenty-three competitive sprinters during a block sprint start in two advanced spike conditions with only a difference in forefoot cushioning stiffness. An instrumented start block was used to measure the ground reaction forces applied in the front and rear leg. The stiffer shoe condition showed significantly better performance for most parameters, suggesting a softer midsole in forefoot cushioning is not related to better block start performance. This study has demonstrated that differences …

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Twenty-Year Trends In Student Readiness, Performance, And Learning In Biomechanics, Chengtu Hsieh, Brian Wallace, Duane Knudson Jul 2024

Twenty-Year Trends In Student Readiness, Performance, And Learning In Biomechanics, Chengtu Hsieh, Brian Wallace, Duane Knudson

ISBS Proceedings Archive

The aim of this study was to investigate the trend in student’s Biomechanics Concept Inventory (BCI) performance over the past two decades (2003 - 2023) in the United States. The mean pre-, post-tests of BCI performance, and normalised gain (g) were extracted from published studies for analysis. Eight studies with 937 participants were examined. The Mann-Kendall tests were used to assess the trend of the datasets. No significant downward or upward trends were observed for both pre-tests (p = 1.0) and post-tests (p = 0.07) performance. However, there is an upward trend in students' normalized gains since 2003 …

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Visualizing Segmental Contributions To Whole-Body Angular Momentum In The Rotational Shot Put And Discus Throw, Kristof Kipp, Nayun Ahn Jul 2024

Visualizing Segmental Contributions To Whole-Body Angular Momentum In The Rotational Shot Put And Discus Throw, Kristof Kipp, Nayun Ahn

ISBS Proceedings Archive

The purpose of this study was to develop a method to visualize the contributions of the free limbs to whole-body angular momentum (L) during the rotational shot put and discus throw. Digital video of track and field throwers were recorded as they performed several shot put and discus throw attempts. Videos were processed with markerless motion capture technology, which was used to generate segment center-of-mass (COM) positions. Whole-body L in the global coordinate system was calculated as the sum of transfer terms of the legs, arms, and trunk segments. To visualize transverse plane L generated by the legs …

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Effect Of Fatigue On Trunk- And Hip-Knee Coordination During Sidestep Cutting Maneuver In Handball Athletes, Dayanne R. Pereira, Renato Moraes, Ana Luiza Lopes, Ronaldo D. Assis, Paulo R. P. Santiago, Bruno L.S. Bedo Jul 2024

Effect Of Fatigue On Trunk- And Hip-Knee Coordination During Sidestep Cutting Maneuver In Handball Athletes, Dayanne R. Pereira, Renato Moraes, Ana Luiza Lopes, Ronaldo D. Assis, Paulo R. P. Santiago, Bruno L.S. Bedo

ISBS Proceedings Archive

This study investigated how fatigue impacts trunk-hip and hip-knee coordination in female handball athletes during the sidestep cutting maneuver (SCM). Twenty participants performed three trials of the SCM task under pre- and post-fatigue conditions. An eight-camera motion capture system tracked reflective markers attached to their skin to compute the trunk, hip, and knee angles. A vector coding technique evaluated coordination patterns. Results indicated that while trunk-knee coordination remained unaffected by fatigue, significant changes were observed in the hip-knee coordination within the transversal plane post-fatigue. These findings highlight the need for customized training that considers possible joint changes caused by fatigue.

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Fatigue-Induced Changes In Knee Kinematics And Muscle Forces In Professional Handball-Specific Task, Bruno L.S. Bedo, Danilo S. Catelli, Dayanne R. Pereira, Ronaldo D. Assis, Paulo R. P. Santiago, Mario Lamontagne Jul 2024

Fatigue-Induced Changes In Knee Kinematics And Muscle Forces In Professional Handball-Specific Task, Bruno L.S. Bedo, Danilo S. Catelli, Dayanne R. Pereira, Ronaldo D. Assis, Paulo R. P. Santiago, Mario Lamontagne

ISBS Proceedings Archive

This study investigated the impact of fatigue on knee kinematics and muscle forces in female handball athletes performing sidestep-cutting manoeuvres. Twenty athletes completed six trials, each divided equally before and after a handball-specific fatigue protocol. Kinematic and kinect data were gathered using an infrared motion capture system and a force plate. Analysis was performed with OpenSim 3.3. The results were compared using statistical parametric mapping. They indicated significant fatigue-related decreases in knee flexion during the early stance phase, reduced activity in the vastus intermedius and medialis muscles. Therefore, the findings indorms the design of programs focused on improving muscle endurance; …

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Relationship Between Kinematic Sequence Characteristics, Upper Extremity Joint Work, And Free-Throw Shooting Accuracy, Tylan Templin, Dimitrije Cabarkapa, Jonathan Miller, Damjana Cabarkapa, Andrew Fry, Travis Eliason, Lance Frazer, Omar Medjaouri, Kase Saylor, Daniel Nicolella Jul 2024

Relationship Between Kinematic Sequence Characteristics, Upper Extremity Joint Work, And Free-Throw Shooting Accuracy, Tylan Templin, Dimitrije Cabarkapa, Jonathan Miller, Damjana Cabarkapa, Andrew Fry, Travis Eliason, Lance Frazer, Omar Medjaouri, Kase Saylor, Daniel Nicolella

ISBS Proceedings Archive

This study investigates the relationship between kinematic sequence variables and upper extremity joint work in basketball free-throw shooting. Thirty-four participants performed free-throw shots, analyzed using a 3D markerless motion capture system (ENABLE). The study focused on the timing of peak segmental angular velocities and their relation to joint work in the shooting shoulder and elbow. Significant correlations were found between the timing of peak angular velocities and upper extremity joint work. The findings suggest that proficient basketball shooters demonstrate a more efficient kinematic sequence, characterized by longer duration of time between knee, pelvis, and elbow peak angular velocities and reduced …

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Markerless Motion Capture And Optimal Control To Inform Pitching Mechanics And Reduce Injury Risk, Tylan Templin, Sakiko Oyama, Travis Eliason, Daniel Nicolella Jul 2024

Markerless Motion Capture And Optimal Control To Inform Pitching Mechanics And Reduce Injury Risk, Tylan Templin, Sakiko Oyama, Travis Eliason, Daniel Nicolella

ISBS Proceedings Archive

The objective of this study is to demonstrate the utility of predictive musculoskeletal simulations in baseball pitching. An optimal control analysis was developed that aimed to minimize injury risk while maintaining pitching performance. The optimization converged on a solution that reduced peak shoulder internal rotation by 27.1% while maintaining peak hand velocity within 1.7%. The optimized simulation suggested that 1) a lower arm slot 2) greater knee extension in the stride leg would lead to reduced injury risk without degrading performance. This study's findings demonstrate the potential of biomechanical analyses in enhancing performance and reducing injury risks in baseball pitchers.

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Runners Sacrifice Economy For Stability And Traumatic Injury Prevention When Faced With Sudden, Slip-Like Perturbations, Markus Hipper, Luca Braun, Yannick Denis, Bastian Anedda, Janina Helwig, Steffen Willwacher Jul 2024

Runners Sacrifice Economy For Stability And Traumatic Injury Prevention When Faced With Sudden, Slip-Like Perturbations, Markus Hipper, Luca Braun, Yannick Denis, Bastian Anedda, Janina Helwig, Steffen Willwacher

ISBS Proceedings Archive

We investigated the trade-off between metabolic cost and dynamic stability in 15 recreational runners who experienced sudden slip-like anteroposterior perturbations (SLAPs) during treadmill running (2.5 m/s). Following SLAPs, a significant 3.4% increase in the cost of transport was observed. However, there were no significant changes in single gait parameters or lower limb kinematics in the sagittal plane. Future investigations should explore the underlying neuromuscular mechanisms and broader functional biomechanical variables. Overall, we show that human motor control prioritizes dynamic stability more when expecting SLAPs compared to non-expecting them, highlighting a potential trade-off between metabolic efficiency and traumatic injury prevention that …

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Shoulder-Elbow Coordination Pattern During Badminton Forehand Drive In Trained And Untrained People, Gyeongeun Lee, Hoon Kim Jul 2024

Shoulder-Elbow Coordination Pattern During Badminton Forehand Drive In Trained And Untrained People, Gyeongeun Lee, Hoon Kim

ISBS Proceedings Archive

The purpose of this study was to compare shoulder and elbow coordination patterns in the transverse plane between trained and untrained people during badminton forehand drives. The coupling angles and phases of the shoulder and elbow in the transverse plane from peak shoulder external rotation to impact time were analyzed using vector coding. Due to the limited sample size, we reported results from descriptive analyses instead of statistical analyses. We found that the trained people exhibited a tendency of larger range of shoulder and elbow motions and more in-phase coordination patterns with shoulder internal rotation dominancy in the transverse plane …

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Jumping And Non-Jumping Athletes Land Differently: Implications For Return To Sport, Jeroen P. Marks, Marsha Tijssen, Mohamed El Hadouchi, Ina Janssen Jul 2024

Jumping And Non-Jumping Athletes Land Differently: Implications For Return To Sport, Jeroen P. Marks, Marsha Tijssen, Mohamed El Hadouchi, Ina Janssen

ISBS Proceedings Archive

Currently the LSI is used to determine whether an athlete is ready to return-to-sport (RTS). However, research shows that LSI inadequately identifies RTS readiness. Assuming that all athletes use the same landing strategy overlooks the potential variation between different sports. This study examines kinematic differences of the triple hop test between jumping and non-jumping athletes using inertial measurement units. Differences in landing kinematics between 18 male athletes (10 handball, 8 judo) were analysed. SPM analysis identified significant differences in trunk rotation and lateral flexion during landing. Notably, judokas demonstrated distinct movement patterns, related to emphasising sport-specific mechanics compared to handballers. …

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Adaptation Of Walking Patterns To Bilateral Loaded Walking, Michael Herzog, Norman Riedel, Melina Beyerlein, Jonas Weber, Barbara Deml, Thorsten Stein Jul 2024

Adaptation Of Walking Patterns To Bilateral Loaded Walking, Michael Herzog, Norman Riedel, Melina Beyerlein, Jonas Weber, Barbara Deml, Thorsten Stein

ISBS Proceedings Archive

Motor adaptation is the process of adjusting motor commands to perform a movement task under altered conditions. The ability and time needed to adapt to an exoskeleton may be crucial to their acceptance and effectiveness. The mechanical changes with exoskeletons are multi-faceted. Therefore, this study focused only on the additional mass and aimed to investigate motor adaptation to bilaterally loaded walking. Six females and six males (24.6±3.8y; 173.3±9.4cm; 66.4±10.1kg) walked with and without weight cuffs attached to their thighs and shanks on a treadmill. Spatio-temporal parameters and lower-limb sagittal angles did not show the hypothesized adaptation progressions and after-effects. Yet, …

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Using Subject-Specific Strength Coefficients To Scale Maximum Isometric Forces For Musculoskeletal Simulation, Hoon Kim, Kristof Kipp Jul 2024

Using Subject-Specific Strength Coefficients To Scale Maximum Isometric Forces For Musculoskeletal Simulation, Hoon Kim, Kristof Kipp

ISBS Proceedings Archive

The purpose of this study was to develop a novel scaling method for use in musculoskeletal simulations. Four college athletes performed typical dynamic movement and isometric strength tasks, while we captured motion capture, ground reaction force, and muscle activation data. Data from the strength task were used to determine subject-specific estimates of maximum isometric muscle force. Our method showed that subject-specific multipliers ranged from 2.32 to 3.37, and decreased normalized root mean squared error between simulated and EMG-measured muscle activation by 52-90% compared to standard scaling. Although the scaling method worked for only 4/10 athletes, it may provide more realistic …

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In-Field Biomechanics Of Halfpipe Snowboarding: A Pilot Study, Matthias Thelen, Christian Merz, Tom Gorges, Dr. Jan-Peter Goldmann, Prof. Dr. Lars Donath, Prof. Dr. Uwe Kersting Jul 2024

In-Field Biomechanics Of Halfpipe Snowboarding: A Pilot Study, Matthias Thelen, Christian Merz, Tom Gorges, Dr. Jan-Peter Goldmann, Prof. Dr. Lars Donath, Prof. Dr. Uwe Kersting

ISBS Proceedings Archive

The aim of this pilot study is to develop a method to measure the sport-specific biomechanics of the Olympic discipline of halfpipe snowboarding. An integrated fusion approach using a global navigation satellite system, inertial measurement units, and an insole system to analyse the athlete's position, movements, and forces transmitted to the board was proposed. To test the feasibility of this method a former European Cup athlete (n=1) performed 32 jumps (16 front- and backside airs) in four runs. The method provided uninterrupted measurement over extended periods of time with minimal distortion to the athlete and plausible results (COM velocity: 5.0±0.5 …

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