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Standing Long Jump Power Estimation From Smartphone Imus, Beatrice De Lazzari, Giuseppe Vannozzi, Valentina Camomilla Jul 2024

Standing Long Jump Power Estimation From Smartphone Imus, Beatrice De Lazzari, Giuseppe Vannozzi, Valentina Camomilla

ISBS Proceedings Archive

The purpose of this study was to provide athletes/coaches with an easy-to-implement estimate of the power of standing long jump (SLJ), recognized as an indicator of the ability of lower limbs of exert power. To this aim, inertial sensors embedded in smartphones were used. A sample group of 150 trained young participants was recruited and asked to perform the SLJ task while holding the smartphone. A set of features was identified, based on biomechanical knowledge and literature, and then selected through Lasso regression to be feed as input of three different optimized machine learning architectures to estimate the SLJ power. …

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Saddle Perceived Comfort Of Competitive Women Road Cyclists, Alba Herrero-Molleda, Rodrigo Bini, Juan Garcia-Lopez Jul 2024

Saddle Perceived Comfort Of Competitive Women Road Cyclists, Alba Herrero-Molleda, Rodrigo Bini, Juan Garcia-Lopez

ISBS Proceedings Archive

The purpose of this study was to identify which are the most used saddle types by competitive women cyclists and their effect on perceived comfort. A comfort questionnaire was completed by 60 elite women cyclists that competed in the Road Cycling Cup, and a picture of their saddle was taken. The participants saddles were classified according to their design (i.e., women, men, and unisex saddles) and their dimensions were also obtained. Women road cyclists find women’s saddles more comfortable than men’s ones, being the women’s saddle the type most used by the participants. However, experienced cyclists use men’s saddles. In …

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Distal Joint Kinetics Are Associated With Shot Put Performance, Shogo Hashimoto, Tempei Tominaga, Keigo Ohyama Byun, Natsuki Sado Jul 2024

Distal Joint Kinetics Are Associated With Shot Put Performance, Shogo Hashimoto, Tempei Tominaga, Keigo Ohyama Byun, Natsuki Sado

ISBS Proceedings Archive

Shot put motion exhibits upper-limb “push type proximal-to-distal sequence”, which is a common motor task with the lower limb. In the lower limb, proximal muscle function is associated with motor performance. Here we show the strong correlation of the wrist torque and power with the flight distance in the motion of 13 male shot putters. For the shoulder, only the peak torque correlated with the flight distance, whereas for the elbow, flexion torque was exerted, and both torque and power did not correlate with the flight distance. We suggest that it is important for shot putters to strengthen both the …

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Alterations In Muscle Synergies In Patients With Knee Osteoarthritis During Level- And Downhill Walking, Lasse Hansen, Jana Rogoschin, Igor Komnik, Wolfgang Potthast Jul 2024

Alterations In Muscle Synergies In Patients With Knee Osteoarthritis During Level- And Downhill Walking, Lasse Hansen, Jana Rogoschin, Igor Komnik, Wolfgang Potthast

ISBS Proceedings Archive

In this study, the effects of knee osteoarthritis (KOA) on muscle synergy composition during locomotion tasks were investigated. Utilizing non-negative matrix factorization on surface electromyography data from 37 participants, analyses of muscle synergies in both level walking and ramp descent in KOA patients and age-matched controls were conducted. It could be shown that KOA affects muscle synergies in the affected limb during level walking, where a merge of synergies during late swing and early stance phases is observed. A similar effect was observed in ramp descent for the affected and unaffected limb. In this study, the impact of KOA on …

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Examining The Impact Of Approach And Exit Phase Strategies On Change Of Direction Performance: A Novel Methodology, Hamish G. Bull, Alexandra C. Atack, Grant Trewartha, Benjamin Priddle, Samuel J. Callaghan Jul 2024

Examining The Impact Of Approach And Exit Phase Strategies On Change Of Direction Performance: A Novel Methodology, Hamish G. Bull, Alexandra C. Atack, Grant Trewartha, Benjamin Priddle, Samuel J. Callaghan

ISBS Proceedings Archive

This study used new insole pressure technology to examine how movement strategies during approach and exit phases affect change of direction (COD) times. Participants (n=26) wore NURVV smart insoles and performed 90˚ cuts off each leg (dominant [Dom] and non-dominant [ND]). Ground contact time (GCT), cadence, centre of pressure, and return to linear sprinting metrics were analysed for four steps about the cut-step. Faster cadence and a more forefoot strike pattern predicted 58% of the variance in Dom side COD ability. ND COD ability was predicted by a faster cadence immediately post-cut and a quicker GCT two steps before the …

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Comparisons Of Head Impacts Between Korean Youth Athletes And Non-Athletes In Soccer Headings, Euichang Kim, Young-Kwan Kim, Sukjin Choi Jul 2024

Comparisons Of Head Impacts Between Korean Youth Athletes And Non-Athletes In Soccer Headings, Euichang Kim, Young-Kwan Kim, Sukjin Choi

ISBS Proceedings Archive

The purpose of this study was to quantify the intensity and location of head impacts and compare them between high school soccer athletes and non-athletes. Twenty participants performed five goal-kick and five corner-kick soccer ball headings projected by a ball launcher machine. The head injury criterion (HIC) was calculated from the linear acceleration data from a head-attached inertial measurement unit (IMU) sensor. Results indicated there was no significant difference in HIC between the two groups. The HIC for forehead impacts was significantly lower than those for parietal contact. Coaches need to guide students to perform the forehead header in order …

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Opensim Full-Body Model For Athletes With A Running-Specific Below The Knee Prosthesis, Lukas Krämer, Marvin Zedler, Kai Heinrich, Wolfgang Potthast, Johannes Funken Jul 2024

Opensim Full-Body Model For Athletes With A Running-Specific Below The Knee Prosthesis, Lukas Krämer, Marvin Zedler, Kai Heinrich, Wolfgang Potthast, Johannes Funken

ISBS Proceedings Archive

To date, there is no comprehensive open-source tool to provide movement analysis of athletes using a running-specific prosthesis (RSP) with a below the knee amputation (BKA) to enable the calculation of corresponding inverse kinematics and dynamics. A combination of physical measurements, 2D imagery, 3D motion capture data and geometrical calculations were used to create a musculoskeletal full-body OpenSim model with subject-specific BKA structures. The model was able to reproduce athlete’s joint angles and joint moments of the lower extremities while allowing for movement comparison to non-amputee athletes. The model provides a motion analysis tool for athletes with a RSP in …

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Undergraduate Students' Perceptions Of A Problem-Based Learning Biomechanics Module, Laurence Protheroe, Luciana De Martin Silva, Celeste Wilkins Jul 2024

Undergraduate Students' Perceptions Of A Problem-Based Learning Biomechanics Module, Laurence Protheroe, Luciana De Martin Silva, Celeste Wilkins

ISBS Proceedings Archive

The purpose of this study was to explore student perceptions of problem-based learning and provide recommendations for practice. Five students enrolled on a 2nd year sports biomechanics module at a UK institution participated in semi-structured focus groups at the mid- and endpoints of the module. Thematic analysis, with an inductive focus, identified themes related to successes, challenges and recommendations. Successes included intellectual development, teamwork and inclusivity. Challenges included uncertainty, engagement and retreat in intellectual development. Recommendations were integration of some traditional methods and choice of assessed problems. Educators can be confident that problem-based approaches can develop desired skills for …

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A Kinematic Analysis Of Shot Putters At A Division I University, Roman Waldera, Bryan Christensen, Kyle Collins, Joel M. Hektner, Justin St Clair Jul 2024

A Kinematic Analysis Of Shot Putters At A Division I University, Roman Waldera, Bryan Christensen, Kyle Collins, Joel M. Hektner, Justin St Clair

ISBS Proceedings Archive

The purpose of this research was to examine the peak height during the flight phase and trunk kinematics during the landing phase, and their effects on throwing distance in the shot put using MOCAP. A secondary purpose was to examine differences between the throwing styles and gender. The participants were 12 university-level shot put throwers (six males, six females). A technique by trunk angle interaction effect just below the level of significance was found (p = .056). Significant relationships were found between throw distance and trunk lateral flexion, with females throwing further with more flexion toward their throwing arm (p …

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Plantar Pressure Differences Between Low-Risk And High-Risk Knee Osteoarthritis Runners: A Preliminary Study, Phillis Soek Po Teng, Ryan Jun Kai Tan Jul 2024

Plantar Pressure Differences Between Low-Risk And High-Risk Knee Osteoarthritis Runners: A Preliminary Study, Phillis Soek Po Teng, Ryan Jun Kai Tan

ISBS Proceedings Archive

Little is known about the biomechanical factors that predate knee osteoarthritis (OA) for high-risk recreational participants. This study aims to investigate if plantar pressure differences exist between low and high-risk knee OA runners. Fifteen male recreational runners participated in a preliminary study and were divided into low-risk (N = 8) and high-risk (N = 7) knee OA groups. Both groups ran 100 metres thrice in both indoor and outdoor settings at a comfortable pace. Participants’ plantar pressure was measured. No significant differences in plantar pressure between low-risk and high-risk knee OA runners were found. Future studies may consider employing a …

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Gender Effect On Torque And Explosive Characteristics At Knee Extensor In Triathletes With High And Low Eating Attitudes, Xin-Cen Wen, Wei-Chun Hsu, Li-Xin Tang, Ting-En Li, Jo-Yu Chung, Yi-Jia Lin Jul 2024

Gender Effect On Torque And Explosive Characteristics At Knee Extensor In Triathletes With High And Low Eating Attitudes, Xin-Cen Wen, Wei-Chun Hsu, Li-Xin Tang, Ting-En Li, Jo-Yu Chung, Yi-Jia Lin

ISBS Proceedings Archive

This study examined the impact of eating attitudes on the strength, agility, explosiveness, and endurance performance of 26 triathletes who were categorized into EAT-Better and EAT-Worse groups. Isometric knee extensor maximal voluntary contractions were conducted before and after cycling incremental VO2 max tests. Results showed that there were no significant between-group differences at baseline and there were gender differences in Peak Knee Extensor Joint Torque and Knee Extensor Joint Impulse. At fatigue status, only females exhibited a decrease in fatigue-induced Knee Joint Impulse. Although there were no significant between-group differences in fatigue status, EAT-Worse exhibited a more notable decrease than …

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Kinematic And Muscular Strategies Of The Lower Back During Backward Somersault Landing In Gymnastics, Rébecca Crolan, Romane Bidet, Fabien Dal Maso, Mathieu Ménard, Charles Pontonnier, Diane Haering Jul 2024

Kinematic And Muscular Strategies Of The Lower Back During Backward Somersault Landing In Gymnastics, Rébecca Crolan, Romane Bidet, Fabien Dal Maso, Mathieu Ménard, Charles Pontonnier, Diane Haering

ISBS Proceedings Archive

The purpose of this study was to investigate the kinematics and muscle activity of the lower limbs and lumbar spine during the landing of a jump in female gymnasts. Sixteen adult gymnasts performed round-offs followed by a back somersault. Lumbar, hip, and knee joint angles at peak GRF and EMG activity of 4 lumbar spine muscles were recorded. The study reveals a large heterogeneity in the kinematic and muscular strategies used by the gymnasts. A more detailed investigation is required to gain a better understanding of the motor behaviors observed, with a view to potentially improving individualized monitoring during the …

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Comparing Work And Rate Of Force Development During Propulsive Phase As Pilot Study In Explosive Movements, Li-Xin Tang, Wei-Chun Hsu, Jiceh-Der Dong Fang, Wei-Lun Su, Xin-Cen Wen, Zhong-Rong Hsieh, Yi-Jia Lin Jul 2024

Comparing Work And Rate Of Force Development During Propulsive Phase As Pilot Study In Explosive Movements, Li-Xin Tang, Wei-Chun Hsu, Jiceh-Der Dong Fang, Wei-Lun Su, Xin-Cen Wen, Zhong-Rong Hsieh, Yi-Jia Lin

ISBS Proceedings Archive

This is a pilot study that aims to compare work and rate of force development (RFD) during the propulsive phase in loaded and unloaded conditions across countermovement jump (CMJ), jump shrug (JS), and power clean (PC) exercises. University students with regular exercise habits were recruited. The motion capture system and force plates were used for biomechanical analysis. The positive work during the propulsive phase significantly differs in CMJ, JS, and PC (p

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Inter-Limb Coordination According To The Use Of Footstrap During Pumping In Windsurfer: A Single Subject Pilot Study, Sabin Chun, Jongchul Park Jul 2024

Inter-Limb Coordination According To The Use Of Footstrap During Pumping In Windsurfer: A Single Subject Pilot Study, Sabin Chun, Jongchul Park

ISBS Proceedings Archive

The purpose of this study was to quantify limb coordination patterns according to the use of footstraps when pumping in windsurfer. We hypothesized that pumping would show different coordination patterns depending on footstrap use. One windsurfer participated in the experiment and performed two types of pumping (footstrap and non-footstrap). Inertial measurement unit (IMU) sensors were using for obtain kinematic data for the elbow, hip, and knee joints. The continuous relative phase angles of elbow-knee and hip-elbow were calculated using kinematic data obtained from IMU sensors. This study showed that limb coordination patterns differed depending on use footstraps. These results can …

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Can Imus Accurately Detect Differences In Dynamic Constraint-Governed Tasks? Application To The Layup Shot In Basketball, Nuha Mohammed Alkhalaf, Matthew Pain, Michael Hiley Jul 2024

Can Imus Accurately Detect Differences In Dynamic Constraint-Governed Tasks? Application To The Layup Shot In Basketball, Nuha Mohammed Alkhalaf, Matthew Pain, Michael Hiley

ISBS Proceedings Archive

The purpose of this study was to assess the validity and reliability of an inertial measurement unit (IMU) system against an optical motion capture system during a dynamic complex task, the layup shot in basketball. Eight basketball players performed 10 trials with and 10 without a defender. Key kinematic variables (jump height, take-off angle, joint angles, COM displacement) were derived and agreement (Bland-Altman plots) and disagreement (RMSE, SPM) calculations were carried out for each trial. The IMU system provided agreeable results for jump height and take-off angle, while joint angles and COM displacement agreement were plane-specific. A between-condition analysis demonstrated …

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Regional Muscle Activation Of The Biceps Femoris, Alexander Fassbender, Kiros Karamanidis, Wolfgang Potthast Jul 2024

Regional Muscle Activation Of The Biceps Femoris, Alexander Fassbender, Kiros Karamanidis, Wolfgang Potthast

ISBS Proceedings Archive

The purpose of this study was to examine regional BFlh activation during isometric knee flexion. Using an isokinetic device and high-density EMG, 11 males performed contractions at all combinations of short, medium and long MTU lengths and three torque levels (30%MVC, 60%MVC, 90%MVC). Distal BFlh exhibited significantly higher activation at 60% MVC and 90%MVC than proximal, indicating intensity-dependent heterogeneity. No effects of muscle length on muscle activation were found. Additionally, the findings suggest BFlh operates on the ascending limb of the force-length relationship. Practitioners should be mindful of potential intramuscular variations in biarticular …

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Segmented Evaluation Of Center Of Mass Pattern Smoothness Throughout Step Aerobics Training As A Measure Of Trainability, Yassaman Djafari Miss, Ahmad R Arshi, Hamid -. Rajabi Dr Jul 2024

Segmented Evaluation Of Center Of Mass Pattern Smoothness Throughout Step Aerobics Training As A Measure Of Trainability, Yassaman Djafari Miss, Ahmad R Arshi, Hamid -. Rajabi Dr

ISBS Proceedings Archive

Trainability is a dynamic phenomenon that measures the changes in trainable factors over time. The current study examines whether smoothness evaluation could be considered as a measure of trainability. To this effect a group of nine middle-aged females (average age: 53.38 yrs, average BMI: 24.45kg/m^2 ) were asked to perform step aerobics training for 24 sessions and their kinematic data were captured using an IMU. The smoothness analysis aimed to analyze each step separately using continuous wavelet transform. Jerk cost changes, as an evaluation of smoothness, in 24 sessions in backward direction magnified the differences between the two steps. Lack …

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The Difference In Visual Search Strategies Between Expert And Novice Instructor In Exercise Movement Assessment, Jonghun Jin, Sangah Bae, Naekyoung Lee, Minji Kim, Soyoun Jee, Bobae Song, Dongwook Seo, Ki-Kwang Lee Jul 2024

The Difference In Visual Search Strategies Between Expert And Novice Instructor In Exercise Movement Assessment, Jonghun Jin, Sangah Bae, Naekyoung Lee, Minji Kim, Soyoun Jee, Bobae Song, Dongwook Seo, Ki-Kwang Lee

ISBS Proceedings Archive

The purpose of this study was to compare visual search strategies (fixations duration ratio on each segment, frequency of fixations and average of fixations duration) between expert and novice in exercise movement assessment using eye-tracking device. Sixteen experts with 5+ years of experience and seventeen novices with less than 1 year of experience were recruited. In eye-tracking experiment they watched three pre-recorded exercise movement assessments (squats in the frontal and sagittal planes and push-ups in the sagittal plane). There were no significant differences with fixations duration ratio on each segment, frequency of fixations and average of fixations duration. The results …

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Kinematics Of The Scissors Kick In The Breaststroke, Hiroshi Suito, Keisuke Teramoto, Kazumasa Ozeki Jul 2024

Kinematics Of The Scissors Kick In The Breaststroke, Hiroshi Suito, Keisuke Teramoto, Kazumasa Ozeki

ISBS Proceedings Archive

This study aimed to clarify the kinematic characteristics of the scissors kick in novice breaststroke swimmers. Six participants exhibited the breaststroke kick and three exhibited the scissors kick. All participants performed two 10-m breaststroke kicks with a board while maintaining a face-down underwater position. The breaststroke kicks were recorded using two synchronized underwater cameras, and three-dimensional analysis was performed on the right-sided kicking movements. The results showed that, with knee flexion, participants who performed scissors kicks showed a significantly greater inversion angle, whereas those who performed normal breaststroke kicks exhibited a change from inversion to eversion before the kick phase. …

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Knee Joint Moments During Sportive Cycling: A Pilot Study, Jonas Ebbecke, Josef Viellehner, Wolfgang Potthast Jul 2024

Knee Joint Moments During Sportive Cycling: A Pilot Study, Jonas Ebbecke, Josef Viellehner, Wolfgang Potthast

ISBS Proceedings Archive

This pilot study examines the impact of varying power outputs (157, 210, 262 W) and cadences (60, 80, 100 rpm) on knee joint kinetics in recreational cycling, aiming to understand the combined effects on knee moments across sagittal, frontal, and transverse planes. Conducted with two recreational cyclists, this full factorial study investigates mechanics through lower-body kinematics and pedal reaction forces. Results indicate varying knee joint moment patterns, especially an increasing external knee extension moment at higher power and cadence as well as a combined effect of both. The findings suggest an interaction between cadence, power output, cycling technique, and knee …

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Gait Event Detection During Walking Using Deep Learning And Thigh-Worn Accelerometry, Claas Lendt, Tom Stewart Jul 2024

Gait Event Detection During Walking Using Deep Learning And Thigh-Worn Accelerometry, Claas Lendt, Tom Stewart

ISBS Proceedings Archive

Mobility and gait are important indicators of human health. However, measuring them outside of a laboratory setting can be challenging. To measure human physical behaviour in free-living conditions, thigh-worn accelerometers and data-driven algorithms are commonly used. This study explores a deep learning approach that utilises data from a single thigh-worn accelerometer. A temporal convolutional network was trained to predict gait events in healthy adults during various walking conditions. The model demonstrated a high level of detection accuracy (F1 score ≥ 99%) and good time agreement for both gait events, with the 95% limits of agreement being -0.04s and 0.04s. …

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Calculation And Evaluation Of A Three-Dimensional Force Following Boxing Punches On A Dummy Head, Carola Birk, Marie Füll, Wolfgang Potthast, Igor Komnik Jul 2024

Calculation And Evaluation Of A Three-Dimensional Force Following Boxing Punches On A Dummy Head, Carola Birk, Marie Füll, Wolfgang Potthast, Igor Komnik

ISBS Proceedings Archive

The current study evaluates an approach that estimates the 3D force acting on a dummy's head and neck construct following boxing punches. The calculation refers to marker-based kinematic measurements, and incorporates the head mass and the estimated effective mass of the striking hand. A total of 2040 punches were compared with measured force values of a six-axial load cell in the upper dummy neck regarding peak force (peakF) and rate of force development (RFD). The two random effect regression models revealed that the calculated force values could significantly predict the measured force values. The results showed reasonable effective mass estimates …

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Thigh Muscle Activity In Experienced Female Handball Players During Preplanned And Unplanned Sidestep Cuts, Kevin Bill, Patrick Mai, Tron Krosshaug, Uwe G. Kersting Jul 2024

Thigh Muscle Activity In Experienced Female Handball Players During Preplanned And Unplanned Sidestep Cuts, Kevin Bill, Patrick Mai, Tron Krosshaug, Uwe G. Kersting

ISBS Proceedings Archive

The purpose of this study was to assess if there is a difference in the thigh muscle activation patterns between a preplanned and unplanned sidestep cut performed by n = 31 experienced female handball players. Electromyogram vector fields containing the muscle activity of the vastus medialis, vastus lateralis, semitendinosus, and biceps femoris from 100 ms before ground contact until toe-off were created and compared using Statistical Parametric Mapping. Results show lower activity in the unplanned cut. When comparing individual muscles, vastus medialis was the only muscle showing differences between tasks, with the unplanned task eliciting lower activity right before initial …

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Effect Of Resisted Sled Sprint Training On Sprinting Abilities Of Junior High School Students, Takeru Hamamichi, Kiyotaka Naoi, Susumu Shigeta, Shin-Ichiro Moriyama Jul 2024

Effect Of Resisted Sled Sprint Training On Sprinting Abilities Of Junior High School Students, Takeru Hamamichi, Kiyotaka Naoi, Susumu Shigeta, Shin-Ichiro Moriyama

ISBS Proceedings Archive

This study aimed to clarify the effects of different resisted sled sprint (RSS) loads on the sprinting abilities of junior high school students. Thirty-two junior high school students completed five RSS sessions in a physical education class. Each used a 12-, 14.5-, or 17-kg sled for the RSS training. According to the ratio of sled weight to body mass (%BM), the students were divided into light (25.75 ± 2.57%BM) and heavy (34.46 ± 2.96%BM) groups. Students completed a 50-m run before and after the session, and their running time, running velocity, step frequency, and step length at 50 m and …

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Amateur Boxing Coaches Perceptions Of The Technical Components Of Straight Punches, Raph Britton, Richard Bolger, Michael Hanlon, Robin Healy, Kris Beattie, Gregory Tierney Jul 2024

Amateur Boxing Coaches Perceptions Of The Technical Components Of Straight Punches, Raph Britton, Richard Bolger, Michael Hanlon, Robin Healy, Kris Beattie, Gregory Tierney

ISBS Proceedings Archive

Boxing coaches’ experiential knowledge from a variety of environments can be used to affirm quantitative findings and shed light on areas for future investigation. Five interviews were conducted with expert amateur boxing coaches on straight punch technique in amateur boxing. Reflexive thematic analysis derived higher order themes regarding the contributing body segments to straight punches, including the lower body, core and upper body. Coaches described punches as starting from the ground and transitioning toward the upper body ending upon impact via the fist. Coaches identified that important components of straight punches include stepping in, rotating the rear foot, rotating the …

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Examining Fatigue Effects On Biomechanical Acl Injury Risk Factors In Female Athletes During Single-Leg Drop Vertical Jump, Raihana Sharir, Mark A. Robinson, Jos Vanrenterghem, Radin Rafeeuddin Radin Dzulfakar Jul 2024

Examining Fatigue Effects On Biomechanical Acl Injury Risk Factors In Female Athletes During Single-Leg Drop Vertical Jump, Raihana Sharir, Mark A. Robinson, Jos Vanrenterghem, Radin Rafeeuddin Radin Dzulfakar

ISBS Proceedings Archive

This study aimed to examine the impact of fatigue on biomechanical factors associated with ACL injury risk in female athletes during the single-leg drop vertical jump task. Thirty-nine female athletes participated, undergoing a fatigue protocol comprising functional high-intensity exercises. Participants completed five trials before and after the fatigue protocol. Post-fatigue, significant differences were observed, including lower peak knee flexion angle. Notably, while fatigue induced changes in kinematic indicators, kinetics remained unaffected. As conflicting evidence in the role of fatigue is still on-going, this study highlights the influence of fatigue on specific mechanics, providing additional insights into the relationship between fatigue …

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Relationship Between Pre-Delivery Stride And Fast Bowling Performance In Cricket, Hamish G. Bull, Peter Alway, Mark A. King Jul 2024

Relationship Between Pre-Delivery Stride And Fast Bowling Performance In Cricket, Hamish G. Bull, Peter Alway, Mark A. King

ISBS Proceedings Archive

This study aimed to investigate fast bowler biomechanics during the pre-delivery stride and how they associate with variables previously linked with faster ball release speeds. Kinematic bowling data was collected from 29 elite fast bowlers using 3D motion capture. Pre-delivery stride technique showed multiple significant associations with performance-related variables: more vertical take-off angles correlated with slower run-up velocity; and a larger downward landing velocity associated with less thoracolumbar flexion during the bowling action. Shallower pre-delivery stride take-off angles might therefore be recommended but physical capacity of the bowler should be considered due to the undesirable association between faster run-up velocity …

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Exploring The Influence Of Femur Bone Anatomical Variability On Cam Morphology, Dominic Bachmann, Ted Yeung, Thor Besier, Wolfgang Potthast Jul 2024

Exploring The Influence Of Femur Bone Anatomical Variability On Cam Morphology, Dominic Bachmann, Ted Yeung, Thor Besier, Wolfgang Potthast

ISBS Proceedings Archive

The purpose of this study was to identify potential femoral geometrical risk factors on cam morphology development and its implications for athletes. 382 segmentations from CT-scans were analysed. Cam morphology was defined by an average distance deviation (ADD) between a healthy fit onto the proximal femur and the segmented proximal femur at the anterolateral head-neck junction and categorized into four groups. Neck-shaft angle, femoral anteversion, neck length and femur length described the femur geometry. Neck-shaft angle demonstrated a significant effect on the ADD. Additionally, a novel method for automatically characterizing femur morphology was developed, offering potential applications in diagnosing cam …

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Body Inclination And Motion Variation Of Body Segments In The Triple Pirouette For Skilled Female Dancers, Mayo Kawabata, Hiroko Tsuda, Kentaro Horiuchi, Masaki Matsumoto, Michiyoshi Ae Jul 2024

Body Inclination And Motion Variation Of Body Segments In The Triple Pirouette For Skilled Female Dancers, Mayo Kawabata, Hiroko Tsuda, Kentaro Horiuchi, Masaki Matsumoto, Michiyoshi Ae

ISBS Proceedings Archive

The study investigated body inclination angle and motion variation for skilled dancers in the triple pirouette. Eleven skilled female ballet dancers were asked to perform the triple pirouette. A three-dimensional motion capture system was used to calculate the body inclination angle and direction angles of the body segment vectors for evaluating the motion variation of the body segments. Maintaining a small body inclination angle during the triple pirouette, they showed a high commonality of the segment motions in the left shank and left thigh of the support leg as well as the upper and lower torso, while a high individuality …

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Punt Kick Motion For Rugby Players With Different Kicking Skills, Taisei Arakaki, Michiyoshi Ae, Susumu Shibatani, Naoki Numazu, Atuya Kurosaki, Masamitsu Ito Jul 2024

Punt Kick Motion For Rugby Players With Different Kicking Skills, Taisei Arakaki, Michiyoshi Ae, Susumu Shibatani, Naoki Numazu, Atuya Kurosaki, Masamitsu Ito

ISBS Proceedings Archive

The purpose of this study was to compare the punt kicking motions for different kicking distances in the college and professional rugby players. Three-dimensional coordinate data were collected from nine college rugby players and six professional players. They were asked to performed three different punt kicks aiming at 35-m, 50-m and maximum (MAX) kicking distances. The approach angle varied with the kick distance in both groups. For the 35-m kick, all players used a straight approach heading to kicking direction. For the 50-m and MAX kicks, they approached to the ball diagonally, which helped to increase the hip rotation range …

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