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Articles 360931 - 360960 of 5211487
Full-Text Articles in Entire DC Network
The Energy Transferred Between Lower-Body Segments By Successful And Less Successful Male Rugby Place Kickers, Alexandra C. Atack, Grant Trewartha, Neil Bezodis
The Energy Transferred Between Lower-Body Segments By Successful And Less Successful Male Rugby Place Kickers, Alexandra C. Atack, Grant Trewartha, Neil Bezodis
ISBS Proceedings Archive
The purpose of this study was to understand how energy is transferred during a rugby place kick and how it differs between successful and less successful kickers. Senior male kickers (n=33) performed maximal range place kicks which were analysed using 3D motion capture (240 Hz), enabling segment powers to be determined. Energy was transferred out of the support leg throughout the backswing and early downswing, adding to the energy at the pelvis, which was subsequently transferred out as the kick knee extended towards the ball. Kickers who were limited by range, transferred less energy out of the support leg and …
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
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 …
Comparisons Of Head Impacts Between Korean Youth Athletes And Non-Athletes In Soccer Headings, Euichang Kim, Young-Kwan Kim, Sukjin Choi
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 …
Opensim Full-Body Model For Athletes With A Running-Specific Below The Knee Prosthesis, Lukas Krämer, Marvin Zedler, Kai Heinrich, Wolfgang Potthast, Johannes Funken
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 …
Bicep Femoris Muscle States Prior To And During A Hamstring Strain Injury Whilst Sprinting, Kevin Wallbank, Carlie Ede, Glen Blenkinsop, Sam Allen
Bicep Femoris Muscle States Prior To And During A Hamstring Strain Injury Whilst Sprinting, Kevin Wallbank, Carlie Ede, Glen Blenkinsop, Sam Allen
ISBS Proceedings Archive
Kinematic and kinetic data from a maximal velocity sprint trial resulting in a hamstring strain injury was analysed using a forward dynamics musculoskeletal model solved using direct collocation (OpenSim Moco) to assess muscle fibre states of the bicep femoris long head (BFlh) muscle during the swing phase. During the injury trial, the BFlh showed greater peak fibre lengths, similar peak fibre force, velocity and power, but less negative work compared to submaximal speeds. Accumulation of muscle tissue damage from previous steps and prior submaximal sprints due to the eccentric demand on the muscle could have resulted in the BFlh failing …
Undergraduate Students' Perceptions Of A Problem-Based Learning Biomechanics Module, Laurence Protheroe, Luciana De Martin Silva, Celeste Wilkins
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 …
The Influence Of Noise In Angular Kinematics On The Transformation Of Linear Acceleration Between Accelerometer Coordinate Frames, Erwan Izri, Neil Bezodis, Mark Waldron, Chris Jones, Liam Kilduff, Rowan Brown
The Influence Of Noise In Angular Kinematics On The Transformation Of Linear Acceleration Between Accelerometer Coordinate Frames, Erwan Izri, Neil Bezodis, Mark Waldron, Chris Jones, Liam Kilduff, Rowan Brown
ISBS Proceedings Archive
Linear accelerations measured by instrumented mouthguards (iMG) are transformed to a common reference frame. To investigate the influence of signal noise on this transformation using ground truth measurements, this study transformed linear accelerations measured by an Anthropomorphic Test Device (ATD) to the iMG frame. Noise was incrementally added to ATD angular velocity signals across 81 impacts. Agreement was quantified between ATD ground truth versus noisy angular velocity, angular acceleration and transformed linear acceleration signals. Angular velocity noise as low as 0.265 rad/s led to errors exceeding 10%, highlighting the transform’s sensitivity to angular kinematics. The findings highlight potential difficulties in …
Using Participant Descriptive Characteristics, Heart Rate And Inertial Sensors To Estimate Running Economy, Krista Vohlakari, Sailee Sansgiri, Timo Rantalainen, Esa Hynynen, Neil Cronin
Using Participant Descriptive Characteristics, Heart Rate And Inertial Sensors To Estimate Running Economy, Krista Vohlakari, Sailee Sansgiri, Timo Rantalainen, Esa Hynynen, Neil Cronin
ISBS Proceedings Archive
In this study, we aimed to develop a machine learning algorithm to estimate running economy. Inertial sensor, heart rate and participant descriptive characteristics were used to estimate running economy by training and comparing five different machine learning models. Fourteen subjects performed a VO2max running test on a treadmill with four-minute stages. Submaximal running speeds (lactate level < 4 mmol/l) were used to train the models. The best-performing model was a k-nearest neighbour regressor, which achieved average root mean square error of 0.097 ± 0.059 kcal/kg/km and average mean absolute percentage error of 8.7 ± 5.8 % compared to ground truth running economy data. Despite reasonably accurate running economy estimates, the model is currently not very generalisable, probably due to the small dataset used for training.
Technical Evaluation Of The Fidelity Of The Htc Vive For Upper Limb Tracking, Matteo Mancuso Phd, Caecilia Charbonnier Dr.
Technical Evaluation Of The Fidelity Of The Htc Vive For Upper Limb Tracking, Matteo Mancuso Phd, Caecilia Charbonnier Dr.
ISBS Proceedings Archive
Novel tracking technologies targeting non-technical users enabled the creation of accessible motion tracking for medical functional evaluation and assisted rehabilitation. Here we describe the adaptation of the HTC Vive tracking technology toward this goal. The resulting system was then tested comparing three different anatomical calibration methods, accounting for inter-subject (1 female, 2 male) and inter-operator (2 experienced, 3 inexperienced) variability, as well as six different methods for spatial alignment with the reference measurements system. Accuracy and precision of our methods were quantified by comparison with Vicon optical tracking system. The accuracy of the anatomical landmark tracking was 2.3 ± 0.5 …
Comparison Between Outcomes Of A Sprint Test On A Wheelchair Ergometer And On-Court Among Wheelchair Tennis Players, Rowie Janssen, Marit Van Dijk, Thomas Rietveld, Sonja De Groot, Lucas Van Der Woude, Han Houdijk, Riemer Vegter
Comparison Between Outcomes Of A Sprint Test On A Wheelchair Ergometer And On-Court Among Wheelchair Tennis Players, Rowie Janssen, Marit Van Dijk, Thomas Rietveld, Sonja De Groot, Lucas Van Der Woude, Han Houdijk, Riemer Vegter
ISBS Proceedings Archive
The current study compared a wheelchair sprint in the laboratory (lab) on a wheelchair ergometer with a wheelchair sprint on-court in a group of experienced wheelchair tennis players. Nine wheelchair tennis players performed a 10m sprint in the lab, on a computerized wheelchair ergometer, and a 10m sprint on-court, equipped with inertial measurement units. Test duration, mean power output and mean velocity showed no differences between lab and field sprints, peak velocity was consistently higher in the field sprint. Despite methodological differences and experienced rolling resistance between the lab and field sprint, test duration, achieved power output and mean velocity …
A Kinematic Analysis Of Shot Putters At A Division I University, Roman Waldera, Bryan Christensen, Kyle Collins, Joel M. Hektner, Justin St Clair
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 …
Modelling Of Scapular Motion Influences The Estimated Glenohumeral Joint Torques During Volleyball Hitting, Dhruv Gupta, Lotte Steynen, Gaelle Pano, Aimilia Rousaki, Nele Heylen, Gert Vande Broek
Modelling Of Scapular Motion Influences The Estimated Glenohumeral Joint Torques During Volleyball Hitting, Dhruv Gupta, Lotte Steynen, Gaelle Pano, Aimilia Rousaki, Nele Heylen, Gert Vande Broek
ISBS Proceedings Archive
This study aims to understand how much different ways of modelling the scapular motion in musculoskeletal models influence the estimated inverse dynamics torques at the glenohumeral joint in simulations of volleyball hitting. We collected hitting motion data of one advanced volleyball player and compared the scapular motion and inverse dynamics torques at the glenohumeral joint estimated using three different musculoskeletal models that model the scapular motion in different ways. We found root mean squared differences of up to 50 Nm in inverse dynamics torques estimated from the different models and coupling between scapula and humerus can affect these estimates. Highest …
Lower Limb Joint Work During Countermovement Jumps In Children With Charcot-Marie-Tooth Type 1a, Laura Engler, Florian Dobler, Philip J. Broser, Nathalie Alexander
Lower Limb Joint Work During Countermovement Jumps In Children With Charcot-Marie-Tooth Type 1a, Laura Engler, Florian Dobler, Philip J. Broser, Nathalie Alexander
ISBS Proceedings Archive
The purpose of this study was to identify lower limb joint power and work in countermovement jumps (CMJ) in children with Charcot-Marie-Tooth type 1A (CMT1A). Therefore, previously collected CMJ data of seven children with CMT1A were compared to seven age- and sex-matched typically developing children (TDC). We focused on the parameters angles, moments, power and work of the hip, knee and ankle joint. In the knee and ankle joints, significantly lower values of power, positive work, and total work were found in children with CMT1A. Furthermore, a lower percentage of knee and ankle contributions to total work was found when …
Plantar Pressure Differences Between Low-Risk And High-Risk Knee Osteoarthritis Runners: A Preliminary Study, Phillis Soek Po Teng, Ryan Jun Kai Tan
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 …
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
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 …
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
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 …
Runners Fatigue Earlier On A Treadmill Versus Overground: Kinematic Evaluation Of A Run-To-Exhaustion, Robbert P. Van Middelaar, Frank J. Wouda, Jasper Reenalda
Runners Fatigue Earlier On A Treadmill Versus Overground: Kinematic Evaluation Of A Run-To-Exhaustion, Robbert P. Van Middelaar, Frank J. Wouda, Jasper Reenalda
ISBS Proceedings Archive
Running biomechanics can be different between treadmill and overground, especially with fatigue during a run-to-exhaustion. The aim of this study was to investigate impact variables and kinematics of participants running an identical treadmill and overground fatigue protocol. Runners ran to exhaustion 9 minutes earlier on the treadmill compared to overground, with similar heart rate and rate of perceived exhaustion. Only peak sternal acceleration was significantly different between conditions, but only in the fatigue state. Environmental factors in a lab, such as air flow absence, may affect the aerobic capacity during running. No clear biomechanical differences suggest that a similar state …
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
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
The Grip Distribution Analysis Between Badminton Smash And Jump Smash, Fu Kao, Min Kuang Pan, Chiu Yuh-Hong, Chien Lu Tsai
The Grip Distribution Analysis Between Badminton Smash And Jump Smash, Fu Kao, Min Kuang Pan, Chiu Yuh-Hong, Chien Lu Tsai
ISBS Proceedings Archive
Badminton smash is one of the most powerful and fastest techniques in racket sports. The purpose of this study was to analyze the grip force and pressure of a collegiate first-class badminton player while performing smash and jump smash movements. A grip pressure system (500Hz) and a high-speed digital camera (2000Hz) were simultaneously used to collect eighteen areas of grip force and pressure of the dominant hand, along with 2D kinematics motion images. The results revealed that the initial shuttle velocity of the jump smash was faster than that of the smash stroke. Additionally, the swing movement of the jump …
Inter-Limb Coordination According To The Use Of Footstrap During Pumping In Windsurfer: A Single Subject Pilot Study, Sabin Chun, Jongchul Park
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 …
Can Imus Accurately Detect Differences In Dynamic Constraint-Governed Tasks? Application To The Layup Shot In Basketball, Nuha Mohammed Alkhalaf, Matthew Pain, Michael Hiley
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 …
Increased Forefoot Energy Return Of Footwear Improves Metabolic Energy Expenditure, Melanie Knopp, Martin Ullrich, Sasa Cigoja
Increased Forefoot Energy Return Of Footwear Improves Metabolic Energy Expenditure, Melanie Knopp, Martin Ullrich, Sasa Cigoja
ISBS Proceedings Archive
The purpose of this study was to determine how systematically increasing the energy return in the forefoot of running footwear impacts energy expenditure of running. For this, 13 participants ran on a treadmill at a submaximal speed, in three shoe conditions differing only in their mechanical properties of the midsole foam, allowing an energy return of 11 J, 12 J, and 13 J, respectively. Running with a 13 J energy return improved energy expenditure compared to the condition with 11 J (2.03%; p = 0.026). The 12 J condition did not significantly differ from the others. These findings suggest that …
Factors Influencing Single Leg Vertical Jump Performance In Aclr Patients, Vasileios Sideris, Roula Kotsifaki, Enda King, Rodney Whiteley
Factors Influencing Single Leg Vertical Jump Performance In Aclr Patients, Vasileios Sideris, Roula Kotsifaki, Enda King, Rodney Whiteley
ISBS Proceedings Archive
This study explores the differences in jump strategy and strength characteristics between athletes who do and do not achieve adequate symmetry in single-leg countermovement jump (SLCMJ) performance following Anterior Cruciate Ligament Reconstruction (ACLR). Including 372 male athletes recovering from primary ACL injuries, the study utilizes independent sample t-tests and regression models to analyze strength and key jump variables. Our findings reveal key differences in knee extensor strength and jump metrics for the involved limb despite no differences in uninvolved limb jump height. These results highlight the significance of SLCMJ testing in ACL rehabilitation, providing valuable insights into patient functional status. …
Regional Muscle Activation Of The Biceps Femoris, Alexander Fassbender, Kiros Karamanidis, Wolfgang Potthast
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 …
Imu Jerk Grab Detection In Snowboard Freestyle, Felix Friedl, Tom Gorges, Christian Merz
Imu Jerk Grab Detection In Snowboard Freestyle, Felix Friedl, Tom Gorges, Christian Merz
ISBS Proceedings Archive
In freestyle snowboarding the grab length during tricks is of high interest for judging and therefore also in coaching athletes. Purpose of this study was to assess the detectability of grabs in snowboard freestyle tricks using jerk data of a board-attached IMU. 117 tricks performed on a trampoline by eight elite national team riders and one coach were analysed. In 95 / 117 jumps different grab phases could be detected using the jerk. The start (median = 0.01s, IQR = 0.01s) and end (median = 0.01s, IQR = 0.01s) of a grab phase, defined as first and last touch of …
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
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 …
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
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 …
A System For Automatic And Fast Gymnastics Pose Estimation And Key Frame Identification, Ilias Masmoudi, Johannes Link, Sebastian Möck, Petra Nissinen, Anne Koelewijn
A System For Automatic And Fast Gymnastics Pose Estimation And Key Frame Identification, Ilias Masmoudi, Johannes Link, Sebastian Möck, Petra Nissinen, Anne Koelewijn
ISBS Proceedings Archive
In artistic gymnastics, performance analysis tools that provide immediate feedback to athletes and coaches are key to optimizing performance. Therefore, we developed a system that provides direct video feedback and automatically identifies key frames relevant to achieve high performance. This system estimates the gymnast’s two-dimensional (2D) and three-dimensional pose from a single-view video and uses a long short-term memory (LSTM) network to identify key frames, in which contact with the ground or an apparatus starts or ends. We compared three 2D pose estimation algorithms and found that MoveNet yielded the highest accuracy, being able to detect 84% of the joints …
Kinematics Of The Scissors Kick In The Breaststroke, Hiroshi Suito, Keisuke Teramoto, Kazumasa Ozeki
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. …
Knee Joint Moments During Sportive Cycling: A Pilot Study, Jonas Ebbecke, Josef Viellehner, Wolfgang Potthast
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 …