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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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Work Smarter Not Harder: Mechanical Work As A Measure Of Athlete Workload, Amarah Epp-Stobbe, Ming-Chang Tsai, Marc Klimstra Jul 2024

Work Smarter Not Harder: Mechanical Work As A Measure Of Athlete Workload, Amarah Epp-Stobbe, Ming-Chang Tsai, Marc Klimstra

ISBS Proceedings Archive

A thorough understanding of competition workloads is necessary to optimize athlete readiness. The purpose of this study was to investigate the contribution of mechanical work within a measure of workload (session-RPE) in women’s rugby sevens. Data from 22 international athletes, participating in 103 matches were gathered, with a total of 1108 complete datasets available for analysis. GPS-monitors worn by athletes gathered data on time and speed. Overall absolute game mechanical work and session-RPE (sRPE) values were calculated. A linear mixed model evaluated the contribution of overall game work to sRPE by athlete. A strong significant association was found between sRPE …

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The Impact Of Limb Symmetry On Stroke-To-Stroke Movement Variability In Para-Swimmers During An Adapted Aerobic Step Test, Matthew Slopecki, Julien Clément, Mathieu Charbonneau, Julie N. Côté Jul 2024

The Impact Of Limb Symmetry On Stroke-To-Stroke Movement Variability In Para-Swimmers During An Adapted Aerobic Step Test, Matthew Slopecki, Julien Clément, Mathieu Charbonneau, Julie N. Côté

ISBS Proceedings Archive

The study purpose was to measure effects of anthropometric limb characteristics on fatigue-related changes in stroke-to-stroke motor variability (MV) of trunk mediolateral (ML) acceleration. Six Paralympic swimmers performed an in-water, fatiguing, freestyle aerobic test consisting of 5 steps of 200m (n = 4); 150m (n = 1) or 100m (n = 1) with a sacrum worn inertial measurement unit. Upper-limb segment lengths were measured, and symmetry indices (LSI) were calculated. Sample entropy (SampEn) and fractal dimension (FD) were calculated on ML acceleration. Fatigue was confirmed with increased RPE (p < 0.01). ANOVA fatigue response models of SampEn and FD improved with LSI as a covariate (p < 0.01), showing that symmetry indices affected individual responses to fatigue. Coaches should consider anthropometric symmetry when designing para-swimming training plans.

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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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Intra- And Inter-Subject Variability In A Realistic, Non-Standardized Exergaming Scenario, Michelle C. Haas, Anna Lisa Martin-Niedecken, Larissa Wild, Leander Schneeberger, Eveline S. Graf Jul 2024

Intra- And Inter-Subject Variability In A Realistic, Non-Standardized Exergaming Scenario, Michelle C. Haas, Anna Lisa Martin-Niedecken, Larissa Wild, Leander Schneeberger, Eveline S. Graf

ISBS Proceedings Archive

The purpose of this study was to assess the variability of lower extremity mechanics related to biomechanical risk factors for anterior cruciate ligament injury. Lower body kinematics were measured in healthy subjects in a realistic, non-standardized exergaming scenario. Variability in a jump exercise were described with the coefficient of variation and leg symmetry was assessed using Welch’s t-test. Inter-subject variability was moderate-high and intra-subject variability was low-moderate in all variables, while leg symmetry differed significantly for knee internal rotation and hip extension (p < .001), but not in the knee valgus. Athletes showing high risk knee biomechanics and high movement variability need clear instructions to prevent more extreme angles. Athletes showing low movement variability need proper recovery periods to avoid ACL fatigue failure.

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Effects Of Stack Height On Running Biomechanics During Level, Uphill, And Downhill Running At Different Speeds, Cagla Fadillioglu, Bernd Stetter, Thorsten Stein Jul 2024

Effects Of Stack Height On Running Biomechanics During Level, Uphill, And Downhill Running At Different Speeds, Cagla Fadillioglu, Bernd Stetter, Thorsten Stein

ISBS Proceedings Archive

This study aimed to investigate the effects of shoe stack height on comfort assessment, step frequency and lower limb joint range of motions (ROMs) during level, downhill and uphill running with different running speeds since stack height is one of the highly discussed key features of running shoes and was not intensively investigated for sloped running conditions. Seventeen male experienced runners completed the running protocol by wearing three running shoes with different stack heights. The kinematics were collected with a 3D motion capturing system. A comfort questionnaire was asked for each shoe. The lowest stack height resulted in the highest …

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Lateral Step-Down Is More Sensitive To Lower Limb Misalignment In Patients With Prepatellar Pain Than Forward Step-Down, Zuosiqi Li, Hanjun Li, Huijuan Shi Jul 2024

Lateral Step-Down Is More Sensitive To Lower Limb Misalignment In Patients With Prepatellar Pain Than Forward Step-Down, Zuosiqi Li, Hanjun Li, Huijuan Shi

ISBS Proceedings Archive

The aim of this study was to determine whether forward or lateral step-down tasks were more sensitive in detecting lower limb misalignment in individuals with patellofemoral pain syndrome (PFPS). The PFPS group (n=26) and the healthy controls group (HC) (n=20) performed the forward step-down (FSD) and the lateral step-down (LSD). Lower extremity kinematic metrics were captured by an 8-camera motion capture system. A two-way ANOVA assessed the effect of group and sex on these metrics. Results revealed that in FSD, there was only a main effect of sex. In LSD, PFPS showed greater peak hip adduction angle (p = …

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Reporting The Loading And Movement Profiles Of Chasse-Step And One-Step Footwork In Table Tennis, Xiaoyi Yang, Qichang Mei, Yaodong Gu, Vickie Shim, Justin Fernandez Jul 2024

Reporting The Loading And Movement Profiles Of Chasse-Step And One-Step Footwork In Table Tennis, Xiaoyi Yang, Qichang Mei, Yaodong Gu, Vickie Shim, Justin Fernandez

ISBS Proceedings Archive

This study aimed to analyze the biomechanical characteristics of athletes with two typical table tennis footwork. Eighteen elite athletes performed chasse-step and one-step. Kinematic and kinetic data were collected using the Vicon and AMTI. Hip joint flexion during one-step increased significantly in the backward swing (p=0.045) while knee joint extension with chasse-step increased greatly (p<0.001) in the forwarding swing. The hip joint contact force of one-step increased in the ant-post direction (p<0.001), though the chasse step contact force of the hip joint increased in the med-lat direction (p<0.001). The findings suggested that the chasse-step had greater quality performance and preparation for the next successive stroke while the one-step showed faster performance which tended to direct score. This information may help coaches develop training programs, athletes improve performance, and prevent injuries.

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Landing Biomechanical Characteristics Of Adolescent Athletes With Anterior Knee Pain Compared To Healthy Controls, Sunghe Ha, Inje Lee Jul 2024

Landing Biomechanical Characteristics Of Adolescent Athletes With Anterior Knee Pain Compared To Healthy Controls, Sunghe Ha, Inje Lee

ISBS Proceedings Archive

Anterior knee pain (AKP) is defined as chronic peripatellar pain. It may be caused by repetitive the knee extensor mechanism, which may predispose adolescent athletes to AKP due to the incomplete maturation. To reduce risk of AKP, we should understand landing biomechanics in adolescent athletes with AKP. Therefore, we aimed to identify landing biomechanical characteristics of the AKP group compared to the control group. We collected data on joint angles, moments, and power, ground reaction forces, and vertical stiffness during landing. We used Mann-Whitney U test and ensemble curve analyses to compare outcome variables between the AKP and control groups. …

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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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Effect Of Enhanced Abductor Hallucis Contraction On Foot Biomechanics In Gait, Jiaqi Lai, Xuehua Wu, Ting Yu, Xianyi Zhang Jul 2024

Effect Of Enhanced Abductor Hallucis Contraction On Foot Biomechanics In Gait, Jiaqi Lai, Xuehua Wu, Ting Yu, Xianyi Zhang

ISBS Proceedings Archive

This study aimed to investigate the effect of enhancing abductor hallucis (AbH) contraction by electrical stimulation (es) on foot biomechanics in gait. Ten healthy adults were recruited for this study. Ground reaction forces (GRFs) and navicular tuberosity (NAV) movement were recorded with and without AbH es during walking. The results showed that enhancing the AbH contraction reduced the range of motion of the NAV height (p=0.030). Meanwhile, the medial GRF was higher in the final stance and the center of pressure (COP) was laterally shifted in the whole stance phase. In conclusion, enhancing AbH contraction could stiffen the foot arch …

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Preparation For Split Leap In Rhythmic Gymnastics – Static Versus Dynamic Stretching, Pui Wah Kong, Berfin Serdil Ors, Cheryl A. Han Jul 2024

Preparation For Split Leap In Rhythmic Gymnastics – Static Versus Dynamic Stretching, Pui Wah Kong, Berfin Serdil Ors, Cheryl A. Han

ISBS Proceedings Archive

This study compared split leap performance following static and dynamic stretching exercises. Seventeen well-trained female rhythmic gymnasts underwent static and dynamic stretching interventions on separate days. Immediately following the stretching exercises, participants performed 3 trials of split leaps. High speed videos of their jumps were analysed for split angle and flight time. Wilcoxon signed-rank tests were used to compare between static and dynamic stretching. Results showed that static stretching resulted in longer flight time [static: 0.430 (0.392 - 0.473) s, dynamic: 0.419 (0.386-0.452) s, p = .021] and greater split angle [median (range), static: 198 (184 - 209)°, dynamic: 191(175-207)°, …

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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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The Coordination Of Upper And Lower Limb Movements In Shooting Basketball From Various Distance: A Pilot Study, Zhichen Feng, Beier Chen, Yu Song, Qin Zhu Jul 2024

The Coordination Of Upper And Lower Limb Movements In Shooting Basketball From Various Distance: A Pilot Study, Zhichen Feng, Beier Chen, Yu Song, Qin Zhu

ISBS Proceedings Archive

Using continuous relative phase (CRP) to quantify upper-lower limb coordination in shooting basketball. Six male participants performed free-throws and 3-point shots in a random order to yield 10 swish shots and 10 missed shots at each distance for analysis. The SPM analysis on CRPs revealed that a similar strategy was used to coordinate upper and lower limbs for shooting (p>0.05), with no distinguished coordination pattern for swish shots (p>0.05). The analysis on between-trial variability of coordination revealed that swish shots required more adjustment of proximal coordination, and 3-point shots entailed more adjustment of distal coordination. These findings shed …

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Gender Differences In Muscle Contraction And Co-Contraction Activities During The Impact Phase Of Single-Leg Landing Task In Badminton, Zhe Hu, Dingxuan Wang, Pingping Zhu, Yanjia Xu Jul 2024

Gender Differences In Muscle Contraction And Co-Contraction Activities During The Impact Phase Of Single-Leg Landing Task In Badminton, Zhe Hu, Dingxuan Wang, Pingping Zhu, Yanjia Xu

ISBS Proceedings Archive

Our study aimed to explore ACL injury risk factors in females versus males during badminton single-leg landings. Sixteen players (8 male, 8 female) participated, with lower limb kinematics, ground reaction forces, and muscle activity measured using motion capture, force plates, and electromyography (EMG). Independent samples t-test analyzed gender differences in leg kinematics, mean normalized leg muscle activation (MVC%), and muscle co-contraction post-landing. Females, compared to males, exhibited higher rectus femoris, medial hamstring, and gastrocnemius muscle activity during the post-landing phase. Additionally, males had a higher co-contraction ratio in the medial and lateral gastrocnemius than females. Female badminton players' neuromuscular control …

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Influence Of Motor-Cognitive Performance On Landing Biomechanics In Different Conditions: Preliminary Results, Filippo Bertozzi, Claudia Brunetti, Scott M. Monfort, Chiarella Sforza, Manuela Galli, Marco Tarabini Jul 2024

Influence Of Motor-Cognitive Performance On Landing Biomechanics In Different Conditions: Preliminary Results, Filippo Bertozzi, Claudia Brunetti, Scott M. Monfort, Chiarella Sforza, Manuela Galli, Marco Tarabini

ISBS Proceedings Archive

This pilot study examines the impact of varied cognitive loads on lower limb biomechanics during landing tasks. Ten male athletes performed a novel motor-cognitive assessment and then a landing task in three conditions with different cognitive loads. Findings suggest cognitive conditions may affect GRF, joint kinematics, and kinetics. Specifically, unanticipated tasks may elevate GRF, while altered hip abduction indicates adjustments in base support. Hip and knee moments vary based on cognitive conditions, emphasizing their influence on load absorption. Additionally, divided attention correlates with increased knee abduction moment, underscoring its relevance in managing potentially harmful sports movements. These results reinforce prior …

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Trunk Posterior Pulling Perturbation Increased Variables Associated With Acl Loading During Landing, Yu Song, Zhichen Feng, Kaden Van Valkenburg, Lauren Salsgiver, Kareem Mersal, Boyi Dai Jul 2024

Trunk Posterior Pulling Perturbation Increased Variables Associated With Acl Loading During Landing, Yu Song, Zhichen Feng, Kaden Van Valkenburg, Lauren Salsgiver, Kareem Mersal, Boyi Dai

ISBS Proceedings Archive

The purpose of this study was to identify the effects of posterior pulling perturbation applied to the upper or lower trunk on variables associated with anterior cruciate ligament (ACL) loading during landing. Thirty-eight participants performed double-leg vertical jumps with and without posterior pulling perturbation applied to the upper/lower trunk shortly after the peak jump height. Perturbation resulted in significantly greater impact forces, smaller knee flexion angles, and greater knee extension and adduction moments compared to no perturbation. Upper trunk perturbation resulted in smaller trunk flexion angles than the lower trunk perturbation location. Mid-flight posterior pulling perturbation applied to upper and …

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Association Between Jump Performance And Acl Injury Kinematic Risk Factors, Claudia Brunetti, Filippo Bertozzi, Rodrigo Rabello, Alice Ranzini, Chiarella Sforza Jul 2024

Association Between Jump Performance And Acl Injury Kinematic Risk Factors, Claudia Brunetti, Filippo Bertozzi, Rodrigo Rabello, Alice Ranzini, Chiarella Sforza

ISBS Proceedings Archive

This study aimed to provide further insights into unclear aspects in the existing literature concerning the association between ACL injury kinematic risk factors and jump performance, as they might conflict. Fifty-four physically active females executed drop jumps with a maximal CMJ. A motion capture system provided knee and hip kinematics. Jump height, contact time, reactive strength index, initial speed, and power were obtained using a contact platform. Spearman’s correlations between first and second landing kinematics and jump indicators were evaluated. The results showed how highly performing participants were also able to land safely, plausibly reducing ACL injury risk factors. These …

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Gait And Foul Risk Differences Between Treadmill And Overground Racewalking, Qipeng Song, Xiaoxue Zhu, Peixin Shen Jul 2024

Gait And Foul Risk Differences Between Treadmill And Overground Racewalking, Qipeng Song, Xiaoxue Zhu, Peixin Shen

ISBS Proceedings Archive

This study compared treadmill and overground racewalking kinematics among 22 elite athletes at their personal best (PB) and 85% PB speeds, revealing significant differences. Ankle dorsiflexion angle decreased at heel strike, while hip flexion angle increased, alongside greater hip angle at toe-off. Comparing PB to 85% PB, contact time and hip flexion angle at heel strike decreased, along with decreased ankle plantarflexion at toe-off, but flight time and step length at heel strike increased. This suggests treadmill racewalking, particularly at PB speeds, exhibits unique gait features, yet without significant differences in flight time and knee angle between conditions, implying no …

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Agreement And Reliability Of Gait Metrics Measured Using The Stride Smart System In The Alterg Treadmill Compared To Xsens, Michelle Lyons, Louise Burnie, Kirsty Lindsay Jul 2024

Agreement And Reliability Of Gait Metrics Measured Using The Stride Smart System In The Alterg Treadmill Compared To Xsens, Michelle Lyons, Louise Burnie, Kirsty Lindsay

ISBS Proceedings Archive

The aim of this study was to assess the agreement and reliability of the spatiotemporal gait metrics measured by the Stride Smart system in the AlterG treadmill compared to the Xsens motion capture system. 17 healthy adults walked on an AlterG treadmill at 3km/h and 4 km/h at 4 bodyweight conditions (100, 75, 50, 25%) while wearing Xsens sensors, repeating this session 7.0 ± 0.7 days later. Gait metrics were calculated using the Xsens motion cloud software, and by the treadmill using the Stride Smart system. Agreement and between-session reliability for the Stride Smart Gait metrics were assessed. Stride Smart …

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Study On The Influence Of Midsole Hardness And Surface Type On Loading Rate In Heel-Strike Runners, Zihan Yang, Chuyi Cui, Zhiyi Zheng, Songhua Yan, Hui Liu, Feng Qu, Kuan Zhang Jul 2024

Study On The Influence Of Midsole Hardness And Surface Type On Loading Rate In Heel-Strike Runners, Zihan Yang, Chuyi Cui, Zhiyi Zheng, Songhua Yan, Hui Liu, Feng Qu, Kuan Zhang

ISBS Proceedings Archive

High loading impact (LI) associated with heel strikes causes running injuries. This study aimed to investigate how midsole hardness and surface type affect LI. 12 runners ran at a fixed speed along an 18m runway with different midsole hardness (Asker C-45, 50, 55, 60) and on different surfaces (Rubber and Concrete). We conducted repeated-measures ANOVA on LI measures, and one-sample t-tests to compare VALR with a threshold value. Midsole hardness and surface type mainly affected VALR. Several combinations of midsole and surface reduced VALR below threshold: C-45 with both surfaces (R: 69.72±8.10 BW/s, C: 71.37±12.50 BW/s), and C-50 with a …

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Racket Holding Forces For Playing A Forehand Stroke At Varied Swing Speeds In Table Tennis, Kohei Watanabe, Hiroshi Kinoshita, Wakana Ishido, Tomohiro Hashiguchi Jul 2024

Racket Holding Forces For Playing A Forehand Stroke At Varied Swing Speeds In Table Tennis, Kohei Watanabe, Hiroshi Kinoshita, Wakana Ishido, Tomohiro Hashiguchi

ISBS Proceedings Archive

The purpose of this study was to investigate racket gripping forces in table tennis when 9 experienced players struck a ball at different swing speeds with a forehand stroke. Handle grip force, and paddle pressing forces by the index finger and thumb, and racket swing speed were measured using a sensor racket developed, and a motion capture system. The handle grip force exhibited peaks before and after the ball impact. The peak handle forces increased with swing speed non-linearly. In the fast drive stroke, the pre-impact peak of the grip force summed for the handle and fingers reached on average …

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Jy61 Imu Sensor External Validity: A Framework For Advanced Pedometer Algorithm Personalisation, Boris Bačić, Chengwei Feng, Weihua Li Jul 2024

Jy61 Imu Sensor External Validity: A Framework For Advanced Pedometer Algorithm Personalisation, Boris Bačić, Chengwei Feng, Weihua Li

ISBS Proceedings Archive

This case study aims to compare a low-cost inertial sensor prototype (JY61 IMU + ESP8266 MCU designed for real-time non-proprietary data streaming over Wi-Fi) with a high-end mobile (iPhone 13 Pro Max) using Matlab pedometer algorithm. Preliminary experiments used data collected at 100 Hz including 20, 50, and 100 steps on a partially carpeted and partially hard floor surface with the test subject wearing high heels and tennis shoes. The error comparison between the sensor (0–1%) and high-end mobile (0–2%) suggests that the sensor can be used as a privacy-preserving pedometer which is smaller, lighter and a low-cost alternative to …

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Machine Learning Approaches For Identification Of Parkinson’S Disease Severity Using Multimodal Features, Hwayoung Park, Changhong Youm, Bohyun Kim, Hyejin Choi, Juseon Hwang, Minsoo Kim Jul 2024

Machine Learning Approaches For Identification Of Parkinson’S Disease Severity Using Multimodal Features, Hwayoung Park, Changhong Youm, Bohyun Kim, Hyejin Choi, Juseon Hwang, Minsoo Kim

ISBS Proceedings Archive

This study aimed to create a digital biomarker for assessing the severity of Parkinson's disease (PD) using multimodal features from 50 PD patients and 50 healthy controls. They underwent clinical tests, gait analysis using a motion capture system, postural and functional evaluations, and lifestyle questionnaires. These multimodal features underwent dimensionality reduction techniques such as logistic regression and principal component analysis to identify PD severity using the MDS-UPDRS total score. The results developed six models using machine learning algorithms (Linear Regression and Random Forest), with Model 1 performing the best; spatiotemporal variables from gait analysis were crucial in identifying PD severity. …

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Measuring Pole Forces In Seated Shot Put, Connor J.M. Holdback, Richard M. Kelso, David S. Haydon, Paul N. Grimshaw, Ross A. Pinder, Rony Ibrahim Jul 2024

Measuring Pole Forces In Seated Shot Put, Connor J.M. Holdback, Richard M. Kelso, David S. Haydon, Paul N. Grimshaw, Ross A. Pinder, Rony Ibrahim

ISBS Proceedings Archive

The measurement of throwing pole forces in seated shot put has not been reported previously in the research literature, forming a considerable gap in the understanding of seated throwing. In this research, two methods for pole force measurement are presented: a deflection-based and a direct load-sensing method. From the comparison of each method, the measurement of pole forces without an instrumented pole is found to be feasible (RMSE

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Peak Hamstring Muscle-Tendon Lengths During Non-Fatigued And Fatigued Accelerative And Maximal Speed Sprint Running In Soccer Players, Shayne Vial, Anthony Blazevich, Mitchell Turner, Mark Scanlan, Jodie Cochrane Wilkie Jul 2024

Peak Hamstring Muscle-Tendon Lengths During Non-Fatigued And Fatigued Accelerative And Maximal Speed Sprint Running In Soccer Players, Shayne Vial, Anthony Blazevich, Mitchell Turner, Mark Scanlan, Jodie Cochrane Wilkie

ISBS Proceedings Archive

Fatigue is thought to be a contributing factor to hamstring injury during sprint running. Injuries can happen during acceleration or maximum speed phases between peak hip flexion and foot-strike, when the hamstring muscle-tendon unit (MTU) is at its longest. The angular displacements of the bones onto which the muscles attach influence hamstring MTU lengths, thus any fatigue-induced alterations to these displacements may be expected to influence MTU lengths, and thus injury risk. We collected 3-D kinematics and modelled hamstring MTU kinematics during the initial three steps of acceleration and two continuous steps of maximum speed sprinting before and after a …

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Characteristics Of Turn Performance In Elite Breaststroke Swimmers, Kazumasa Ozeki, Seiya Kaimasu, Hiroshi Suito, Shinji Sakurai Jul 2024

Characteristics Of Turn Performance In Elite Breaststroke Swimmers, Kazumasa Ozeki, Seiya Kaimasu, Hiroshi Suito, Shinji Sakurai

ISBS Proceedings Archive

The purpose of this study was to investigate relationships between the breaststroke turn phase time and movement during the turn phase in male competitive swimmers. The participants were six male breaststroke swimmers. All subjects performed three 100 m breaststroke trials with a push start, and the trial with the shortest time was selected for analysis. The swimmers were filmed using four cameras, and kinematic variables during the turn phase were calculated using two-dimensional analysis. The total turn time was 8.96 ± 0.20 s, and the 5 m RTT was 5.60 ± 0.13 s. Significant negative correlations were found between total …

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Visual Task Constraints Influence Head Control And Coordination Variability In Contact Sport Athletes, Samuel R. Zeff, Joseph Hamill, Douglas Martini, Richard Van Emmerik Jul 2024

Visual Task Constraints Influence Head Control And Coordination Variability In Contact Sport Athletes, Samuel R. Zeff, Joseph Hamill, Douglas Martini, Richard Van Emmerik

ISBS Proceedings Archive

We sought to determine whether contact sport participation affects visual acuity, head control, and coordinative variability during locomotor tasks. Thirteen contact and eleven noncontact athletes completed treadmill walking tasks with and without a visual Landolt C task (identify open circle orientation). During baseline, head motion did not differ between groups, but contact athletes had reduced pelvis-thigh variability compared to noncontact athletes. During the visual condition only noncontact athletes reduced vertical head displacement which may reflect an adaptive motor strategy not present in contact athletes. These differences were accompanied by significantly reduced coordinative variability in contact athletes compared to noncontact athletes. …

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