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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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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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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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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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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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Effects Of Comprehensive Exercise Therapy On Knee Joint Function Among Older Adults With Knee Osteoarthritis, Peixin Shen, Qipeng Song, Xiaoxue Zhu, Dewei Mao Jul 2024

Effects Of Comprehensive Exercise Therapy On Knee Joint Function Among Older Adults With Knee Osteoarthritis, Peixin Shen, Qipeng Song, Xiaoxue Zhu, Dewei Mao

ISBS Proceedings Archive

This study investigated the effects of comprehensive exercise therapy on knee joint function for older adults with knee osteoarthritis (KOA). Sixty-six older adults with KOA were randomly assigned to either the exercise group (EG), the heat and electrotherapy group (HG), or the control group (CG) to receive an 8-week intervention. Two-way repeated measures ANOVA was used to analyze the data of knee pain, proprioception, angle, moment, and strength. At week8, the EG had decreased pain scores, proprioception threshold, and knee abduction moment, increased flexion angle and extensor strength; the EG showed lower pain scores and greater strength than the HG …

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Where And When: Identifying Key Regions Of Overground Sprint For Horizontal Force-Velocity Profiling, Daniel Geneau, Marc Klimstra, Ming-Chang Tsai Jul 2024

Where And When: Identifying Key Regions Of Overground Sprint For Horizontal Force-Velocity Profiling, Daniel Geneau, Marc Klimstra, Ming-Chang Tsai

ISBS Proceedings Archive

The purpose of this study was to identify regions of an overground sprint trial required to accurately determine independent Horizontal Force Velocity (FV) measures. Forty-seven university aged athletes completed two separate overground sprint trials. Baseline FV metrics; theoretical maximum velocity [V_0], peak velocity [V_max], maximum power [P_max], maximum theoretical force [F_0], decrease ratio of force [DRF], and force-velocity slope [〖FV〗_slope] were calculated for each trial. Trials were then modified by systematically removing percentages of the total sprint from the beginning and end of the trial independently. FV metrics were compared at each percentage stage and compared to baseline. Results of …

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Whole-Body Coordinative Strategies Contribute To The Minimization Of Centre Of Mass Displacement In Maximal Velocity Sprinting, Chris L. Vellucci, Shawn Beaudette Jul 2024

Whole-Body Coordinative Strategies Contribute To The Minimization Of Centre Of Mass Displacement In Maximal Velocity Sprinting, Chris L. Vellucci, Shawn Beaudette

ISBS Proceedings Archive

Sprinting is a dynamic skill that requires rapid and precise postural control. This study investigates the association between frontal plane centre of mass (CoM) displacement, whole-body coordination, and sprint velocity. Significant correlations with sprint velocity were found between stance phase frontal plane (cPL), superior inferior range of motion (SI ROM), and sprint velocity. Spatiotemporal coordinative coupling of the bilateral knees and thorax-pelvis axial twisting displayed significant partial correlations with the minimization of frontal plane cPL and SI CoM RoM. The findings of this work suggest that both the upper and lower body contribute to the control of the CoM within …

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Correlation Between Laboratory And Field Core Stability Tests And Their Link With Performance And Acl Injury Risk, Théo Weber, Guillaume Mornieux, Raphaël Jacquot, Gérôme Gauchard, Youri Duchene Jul 2024

Correlation Between Laboratory And Field Core Stability Tests And Their Link With Performance And Acl Injury Risk, Théo Weber, Guillaume Mornieux, Raphaël Jacquot, Gérôme Gauchard, Youri Duchene

ISBS Proceedings Archive

The purpose of this study was to identify the most relevant field tests for assessing core stability components and performance and injury risk. National-level women handball players (n=14) performed core stability tests in laboratory and field conditions. Moreover, their athletic performance and ACL injury risk were assessed. CKCUEST was explained by flexibility and endurance component of core stability. Shooting speed was correlated with force, flexibility and endurance, while jumping height was linked to flexibility. Positive correlation was found between ACL injury risk and core strength. These findings could help trainers to select more discriminant tests to evaluate their athletes.

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Impact Of Footwear Bending Stiffness And Torsional Stiffness On Ankle Biomechanics During Handball Specific Fake-And-Cut Manoeuvres, Timo Bagehorn, Kevin Bill, Patrick Mai, Tron Krosshaug, Uwe Kersting Jul 2024

Impact Of Footwear Bending Stiffness And Torsional Stiffness On Ankle Biomechanics During Handball Specific Fake-And-Cut Manoeuvres, Timo Bagehorn, Kevin Bill, Patrick Mai, Tron Krosshaug, Uwe Kersting

ISBS Proceedings Archive

In this study, the impact of footwear bending stiffness on ankle and foot biomechanics during indoor fake-and-cut manoeuvres was investigated. Footwear, along with torsional and bending stiffness, are hypothesized to influence the risk of ankle sprain injury. In this study, a mobile, pneumatically driven cantilever rig was used to quantify these footwear characteristics. Following this, participants executed fake-and-cut movements wearing their habitual footwear, while motion capture and force plate data were recorded. Utilizing machine learning clustering algorithms, participants were grouped based on their footwear stiffness. Subsequent SPM analysis revealed lower forefoot dorsiflexion and increased forefoot inversion in the stiff group. …

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Estimating Joint Moments During Treadmill Running Using Various Consumer Based Wearable Sensor Locations, Josh Autton Carter, Xi Chen, Dario Cazzola, Grant Trewartha, Ezio Preatoni Jul 2024

Estimating Joint Moments During Treadmill Running Using Various Consumer Based Wearable Sensor Locations, Josh Autton Carter, Xi Chen, Dario Cazzola, Grant Trewartha, Ezio Preatoni

ISBS Proceedings Archive

We estimated lower limb sagittal plane joint moments during treadmill running using wearable sensors and different commonly used locations. We compared outcomes from supervised recurrent neural network machine learning (ML) models to criterion values from motion capture and inverse dynamics. The normalised root mean squared error between outcomes from the ML model fed with the entire wearable dataset (pressure insoles and inertial measurement units at the foot, wrist, T10, and sacrum) was 8.9%, 13.5%, and 18.2% for the ankle, knee, and hip joint respectively. Removal of any two upper body sensors did not decrease the accuracy of the estimations. This …

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The Impact Of Ground Reaction Force Variables On Bend Sprint Running Performance, Jonathan White, Joseph Moore, Hans Von Lieres Und Wilkau, Gareth Irwin, Cassie Wilson, Timothy Exell Jul 2024

The Impact Of Ground Reaction Force Variables On Bend Sprint Running Performance, Jonathan White, Joseph Moore, Hans Von Lieres Und Wilkau, Gareth Irwin, Cassie Wilson, Timothy Exell

ISBS Proceedings Archive

This study aimed to investigate force production and highlight kinetic variables that relate to bend sprinting performance. Eight competitive sprinters undertook three 60 m sprints around a 36.5 m bend radius. Paired t-tests were run using statistical parametric mapping to compare the left and right stance phases. Pearson correlation coefficients were calculated to assess the relationships between step velocity (SV) and kinetic variables. Significantly greater vertical and inward force was produced during early right stance compared to left. Left inward force was significantly greater than left during mid and late stance. Only braking durations were significantly negatively correlated to SV. …

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Development And Recommendation Of Kinematic Event Detection Methods For Use During Bend Sprint Running, Jonathan White, Cassie Wilson, Gareth Irwin, Hans Von Lieres Und Wilkau, Joseph Moore, Timothy Exell Jul 2024

Development And Recommendation Of Kinematic Event Detection Methods For Use During Bend Sprint Running, Jonathan White, Cassie Wilson, Gareth Irwin, Hans Von Lieres Und Wilkau, Joseph Moore, Timothy Exell

ISBS Proceedings Archive

This study aimed to validate different kinematic event detection methods for use during maximal velocity bend sprint running. Eight sprinters completed nine 60 m bend sprints each around an athletic track with a 36.5 m bend radius. Three kinematic event detection methods were adapted and compared to instances of touchdown and toe-off as determined by force plates. Using peak and maximum vertical acceleration of the toe marker yielded mean errors of less than 1 frame (0.004 s) for touchdown, whilst peak acceleration was the most accurate for determining toe off (mean error = 0.85 frame).The findings suggest that, when carefully …

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Towards Real-Time Assessment: Wearable-Based Estimation Of 3d Knee Kinetics In Running And The Influence Of Preprocessing Workflows, Lucas Höschler, Christina Halmich, Christoph Schranz, Julian Fritz, Anne Koelewijn, Hermann Schwameder Jul 2024

Towards Real-Time Assessment: Wearable-Based Estimation Of 3d Knee Kinetics In Running And The Influence Of Preprocessing Workflows, Lucas Höschler, Christina Halmich, Christoph Schranz, Julian Fritz, Anne Koelewijn, Hermann Schwameder

ISBS Proceedings Archive

This study aimed to estimate knee kinetics in recreational runners during treadmill running based on seven IMUs and pressure insoles using convolutional neural networks (CNN) with two input segmentations. Ground-truth knee moments of 19 runners during sloped and level treadmill running were calculated by conventional lab-based methods. We trained two CNNs on (1) step-segmented and (2) continuously windowed inputs and investigated differences in their joint moment estimations to ground-truth calculations. For both input segmentations, the predictions errors (nRMSE) were below 0.10 and 0.25 for the sagittal and non-sagittal planes, respectively. The continuous inputs led to a slightly decreased accuracy during …

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Speed-Dependent Increase In Lumbar Lordosis Is Inconsistent With Speed-Independent Pelvic Tilt During Treadmill Running, Tempei Tominaga, Yoshiki Tasaki, Natsuki Sado Jul 2024

Speed-Dependent Increase In Lumbar Lordosis Is Inconsistent With Speed-Independent Pelvic Tilt During Treadmill Running, Tempei Tominaga, Yoshiki Tasaki, Natsuki Sado

ISBS Proceedings Archive

Lumbar lordosis (LL) is considered as an important factor of low back pain. Although LL during running (dynamic LL) and anterior pelvic tilt (APT) are thought to increase simultaneously, this relationship has not been examined when running speed is changed. Here we show that dynamic LL increases with the increase in running speed, whereas APT is invariant during treadmill running at 4.0, 5.5, 7.0 and 8.5 m/s in 18 male collegiate athletes. The speed-dependent increase in dynamic LL suggests that runners and coaches should be cautious that greater mechanical load on the lumbar spine might occur during faster running. The …

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The Relationships Of Functional Mobility With Muscle Strength And Proprioception Among Older Adults, Qi Wang Miss, Yanhao Liu, Qipeng Song, Dewei Mao, Xinrui Zhang Jul 2024

The Relationships Of Functional Mobility With Muscle Strength And Proprioception Among Older Adults, Qi Wang Miss, Yanhao Liu, Qipeng Song, Dewei Mao, Xinrui Zhang

ISBS Proceedings Archive

Functional mobility impairment is the most common risk factor for falls among older adults, with three potential factors (muscle strength, tactile sensation, and proprioception) being responsible for their functional mobility. This study aims to compare functional mobility and the three factors, and investigate their relationships among older adults of different ages. One hundred sixty-six participants were categorized into younger (YG), middle (MG), or older (OG) aged groups. The OG has worse functional mobility, muscle strength, tactile sensation, and proprioception than YG and MG. In the YG and MG groups, both proprioception and muscle strength showed correlations with functional mobility. In …

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Associations Between Strength And Power With Throwing Performance In High Level Male And Female Javelin Throwers, Miika Köykkä, Johanna K. Ihalainen, Anssi Saari, Benjamin Waller, Neil J. Cronin Jul 2024

Associations Between Strength And Power With Throwing Performance In High Level Male And Female Javelin Throwers, Miika Köykkä, Johanna K. Ihalainen, Anssi Saari, Benjamin Waller, Neil J. Cronin

ISBS Proceedings Archive

This study investigated the associations between strength and power measures and estimated javelin throwing performance. Thirteen male (personal best: 77.0 ± 5.7 m) and thirteen female (55.8 ± 5.8 m) javelin throwers underwent various lower and upper body power and strength tests, along with a javelin throwing test. Associations with throwing performance were observed for lower body power measures in males and upper and lower body maximal strength in females, suggesting sex-specific differences in important physical characteristics for throwing.

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The Effect Of Surfaces On The Knee Biomechanics Of A 90 Degree Cut, Samantha Rhodes, Richard Jones, Lee Herrington, Chris Bramah Jul 2024

The Effect Of Surfaces On The Knee Biomechanics Of A 90 Degree Cut, Samantha Rhodes, Richard Jones, Lee Herrington, Chris Bramah

ISBS Proceedings Archive

Assessments following anterior cruciate ligament (ACL) injuries are commonly on surfaces that do not represent the playing or training surface. This study aimed to investigate how different surfaces, specifically a running track and artificial grass, influence biomechanics during a 90-degree change of direction (COD). Seventeen participants performed a 90-degree COD on both a running track surface and an artificial grass surface. Motion capture and force plate data were collected. No significant differences were observed in kinematic variables between surfaces. However, the knee extensor moment and posterior braking force were significantly higher on the running track compared to artificial grass (P

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On-Court Mechanical Work Measured Using Markerless Motion Capture Is Associated With Acute Fatigue In Tennis, Julie Emmerson, Laurie Needham, Murray Evans, Sean Williams, Steffi Colyer Jul 2024

On-Court Mechanical Work Measured Using Markerless Motion Capture Is Associated With Acute Fatigue In Tennis, Julie Emmerson, Laurie Needham, Murray Evans, Sean Williams, Steffi Colyer

ISBS Proceedings Archive

Measurement of mechanical work with a markerless motion capture system was assessed for the application of training ‘load’ monitoring. Four tennis players completed an on-court fatiguing protocol interspersed with sprint tests, with relationships between reduction in sprint velocity and internal and external mechanical work done tested. Repeated measures correlations for total and external mechanical work, and external mechanical work estimated from centre of mass proxies (pelvis and mid-hip) were comparable and ranged from -0.89 to -0.86. Whilst the calculated work done varied greatly between the methods (~42% for pelvis), all showed a strong relationship with fatigue and could provide insight …

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Effects Of Half-Marathon Running On Quadriceps And Hamstring Torque, Wenjin Wang, Marvin Zedler, Yutong Jing, Wolfgang Potthast Jul 2024

Effects Of Half-Marathon Running On Quadriceps And Hamstring Torque, Wenjin Wang, Marvin Zedler, Yutong Jing, Wolfgang Potthast

ISBS Proceedings Archive

This study aims to investigate changes in concentric and eccentric quadriceps and hamstring torque following half-marathon running on the treadmill. Thirty-eight recreational runners participated in this study. Isokinetic dynamometry measured torque before, 5 minutes, 24 and 48 hours after completing half-marathon. A significant decrease in concentric and eccentric torque were observed at 5 minutes after a half-marathon for both hamstrings (all p < 0.001) and quadriceps (all p < 0.001), with recovery evident within 24 hours. However, 48 hours after the half-marathon, individuals exhibited increased concentric hamstrings torque (p=0.034) and eccentric quadriceps (p=0.002) compared to the baseline. Running a half-marathon may increase the risk of running injuries. However, these effect were transient, with torque levels returning to baseline within 24 hours.

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The Impact Of Classical Chinese Dance On The Gait Of The Elderly – Cross Sectional Study, Chia-Ling Chen, Jia-Hao Chang Jul 2024

The Impact Of Classical Chinese Dance On The Gait Of The Elderly – Cross Sectional Study, Chia-Ling Chen, Jia-Hao Chang

ISBS Proceedings Archive

This study was to explore the difference of gait between normal healthy elders and elders who experienced in classical Chinese dance. Subjects divided into 2 groups (7 subjects in classical Chinese dance group, 7 subjects in control group),data was collected at a single point in time from groups and used the APDM Movement Monitoring system to analysis gait patterns. The experiment group showed improved gait metrics: smaller left circumduction (4.3±2.2 vs. 7.2±1.3, p=0.01), larger right foot strike angle (17.58±2.53 vs. 11.04±5.46, p=0.014), reduced trunk coronal motion (3.47±1.04 vs. 6.90±2.36, p=0.004), and decreased trunk transverse motion (5.78±.79 vs. 7.06±1.22, p=0.038). These …

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Novel Strength Training Targeting Medial Quadriceps/Hamstring Can Alter The Biomechanical Risk Factors For Acl Injury, Jiyoung Jeong, Dai-Hyuk Choi, Choongsoo S. Shin Jul 2024

Novel Strength Training Targeting Medial Quadriceps/Hamstring Can Alter The Biomechanical Risk Factors For Acl Injury, Jiyoung Jeong, Dai-Hyuk Choi, Choongsoo S. Shin

ISBS Proceedings Archive

The purpose of this study was to examine the effects of strength training targeting the medial thigh muscles on knee joint kinematics, kinetics, and muscle activation during single-leg landing. Eighteen healthy participants conducted exercises targeting medial thigh muscles for 8 weeks. Three-dimensional knee joint kinematics/kinetics and muscle activity of lower extremity were obtained before and after training. Two-tailed paired t-tests were performed at a significance level of 0.05. As the results, there were decreased varus-valgus excursion (p=0.011) and peak valgus moment (p=0.029), but increased gluteus medius activation (p=0.020) and vastus medialis-to-vastus lateralis co-activation …

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The Influence Of Stature On Human Vertical Jumping Performance, Sam Allen Jul 2024

The Influence Of Stature On Human Vertical Jumping Performance, Sam Allen

ISBS Proceedings Archive

Humans become relatively weaker as they increase in size. Despite this, simulations have shown that increased size is of benefit in vertical jumping when isometric scaling is employed due to beneficial effects on the shortening velocity of muscles. Human body mass scales allometrically with the square of stature and it is shown that, assuming constant body composition, strength scales as a function of stature and independently of width and depth. A four-segment planar torque-driven computer model was used to simulate squat jump performance. Body dimensions were scaled allometrically to stature ±3 standard deviations from the mean stature of a young …

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Possibility Of Early Detection Of Parkinson’S Disease Using Convolutional Neural Network During Six-Minute Walk Test, Hyejin Choi, Changhong Youm, Hwayoung Park, Bohyun Kim, Juseon Hwang, Minsoo Kim Jul 2024

Possibility Of Early Detection Of Parkinson’S Disease Using Convolutional Neural Network During Six-Minute Walk Test, Hyejin Choi, Changhong Youm, Hwayoung Park, Bohyun Kim, Juseon Hwang, Minsoo Kim

ISBS Proceedings Archive

This study aimed to determine the accuracy of distinguishing patients with early Parkinson’s disease (PD) (n=27) from healthy controls (n=50) using a convolutional neural network (CNN) technique with an artificial intelligence deep learning algorithm based on a 6-minute walk test (6MWT) using wearable sensors. After wearing the six sensors, the participants performed the 6MWT, and the time-series data were converted into new images. The main results demonstrated the highest discrimination accuracy of 72% on the left arm gyroscope data. The results confirmed the possibility of using CNN models to distinguish between individuals with early PD and controls. Moreover, the 6MWT …

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Pattern Matching Analysis Of Lower-Limb Gait Motion In Water And On Land And Its Relationship To Joint Motion, Koichi Kaneda, Yuji Ohgi, Mark Mckean, Brendan Burkett Jul 2024

Pattern Matching Analysis Of Lower-Limb Gait Motion In Water And On Land And Its Relationship To Joint Motion, Koichi Kaneda, Yuji Ohgi, Mark Mckean, Brendan Burkett

ISBS Proceedings Archive

This study applied dynamic time warping (DTW) to lower-limb gait motion in water with a slow to fast pace compared with those on land at a comfortable pace; this was done for 15 participants to examine if the result obtained would be similar to previous study irrespective of gait pace in water. The correlation between the DTW results and the joint angle difference in the two environments was also investigated to clear the reason for the result of DTW. Consequently, DTW detected incomplete motion in the water at any pace in the hip joint just before the toe-off, which moderately …

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Machine Learning Approach To Classify Decline Of Cognitive And Muscle Function In Older Women: Gait Characteristics Based On Three Speeds, Bohyun Kim, Changhong Youm, Hwayoung Park, Hyejin Choi, Juseon Hwang, Minsoo Kim Jul 2024

Machine Learning Approach To Classify Decline Of Cognitive And Muscle Function In Older Women: Gait Characteristics Based On Three Speeds, Bohyun Kim, Changhong Youm, Hwayoung Park, Hyejin Choi, Juseon Hwang, Minsoo Kim

ISBS Proceedings Archive

This study aimed to evaluate the accuracy of machine learning models based on selected gait features caused by cognitive (Cog) and muscle function (MF) declines. A total of 154 women aged 65 or older performed cognitive assessments, five times sit-to-stand test, and gait test at three speeds (preferred, slower (SWS), and faster walking speed (FWS)). The machine learning model accuracies revealed that the random forest (RF) model had 91.2% accuracy when using all gait features and 91.9% accuracy when using the three features (walking speed and coefficient of variation of the left double support phase at FWS and right double …

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Acute Effects Of Footwear And Footstrike Pattern On Achilles Tendon Loading During Running, Xini Zhang, Liqin Deng, Songlin Xiao, Weijie Fu Jul 2024

Acute Effects Of Footwear And Footstrike Pattern On Achilles Tendon Loading During Running, Xini Zhang, Liqin Deng, Songlin Xiao, Weijie Fu

ISBS Proceedings Archive

The study aimed to investigate the effect of footwear and foot strikes on Achilles tendon (AT) loading during running. Eleven male recreational runners with rearfoot strike pattern were recruited. The ground reaction force, kinematics, and kinetics of the ankle joint at 10 km/h were collected using an instrumented split-belt treadmill and a motion capture system. The morphological and mechanical characteristics of AT were recorded and calculated with a synchronous ultrasonic imaging instrument. The results showed a significantly greater peak AT force in minimalist shoes and forefoot strike pattern. The peak force and length change of the AT significantly increased when …

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