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Articles 82561 - 82590 of 1327486
Full-Text Articles in Entire DC Network
The Sexes Exhibited Similar Patterns Of Upper Trapezius Excitation Distribution At Rest And With Fatigue During Repeated Arm Elevation, Kara-Lyn Harrison, Rebecca Franklin, Melina Kaluzny, Trisha D. Scribbans
The Sexes Exhibited Similar Patterns Of Upper Trapezius Excitation Distribution At Rest And With Fatigue During Repeated Arm Elevation, Kara-Lyn Harrison, Rebecca Franklin, Melina Kaluzny, Trisha D. Scribbans
ISBS Proceedings Archive
Females experience more shoulder pathology compared to males, which is partly attributed to differences in muscle excitation between the sexes. We determined if upper trapezius (UT) excitation distribution differed at rested and fatigue at three tertiles of shoulder flexion. Twenty-eight participants completed a repeated arm elevation task to volitional fatigue while holding a load relative to 30% of their maximum isometric shoulder flexion force while high density electromyography was collected from the UT. Statistical parametric mapping t-tests between males and females excitation map for each tertile at rested and fatigue revealed that UT excitation differed in 168 pixels (~43% of …
Inter-Individual Variability In Knee Kinematics During The Tennis Serve, Kaies Deghaies, Thibault Lussiana, Pierre Touzard, Loic Fourel, Simon Ozan, Cyrille Gindre, Benoit Bideau, Caroline Martin
Inter-Individual Variability In Knee Kinematics During The Tennis Serve, Kaies Deghaies, Thibault Lussiana, Pierre Touzard, Loic Fourel, Simon Ozan, Cyrille Gindre, Benoit Bideau, Caroline Martin
ISBS Proceedings Archive
This study aimed to (1) evaluate inter-individual variability in knee kinematics during tennis serve among professional players and (2) investigate the relationships between these knee kinematics and indicators of serve performance. Twenty-three male ATP ranked players participated in this study. Their serve motion was captured using a marker-based motion capture system. The assessment of inter-individual variability was carried out via coefficient of variation (CV). Knee joint angle at maximum flexion and knee extension ROM for both knees are significantly and strongly correlated with ball impact height. This finding highlights the role of knee motion in serve performance. During the flexion …
Sensor-Driven Analysis Of Angle Of Attack In Alpine Skiing: A Laboratory Exploration, Sebastian Schütz, Christoph Thorwartl, Patrick Thorwartl, Thomas Stöggl, Helmut Holzer
Sensor-Driven Analysis Of Angle Of Attack In Alpine Skiing: A Laboratory Exploration, Sebastian Schütz, Christoph Thorwartl, Patrick Thorwartl, Thomas Stöggl, Helmut Holzer
ISBS Proceedings Archive
The aim was to address the absence of a universal measuring instrument for detecting the degree of carving or skidding in a ski turn. Sensors were employed to calculate the so-called angle of attack (θ), which increases if lateral skidding increases. A mathematical concept in 2D and 3D for sensor-based detection of the θ was developed and evaluated on a self-built centrifugal machine capable of executing both optimal carving as well as certain degrees of skidding. The variation of θ was systematically divided into the stages small, medium, and large. Each stage was further subdivided into three smaller levels to …
The Development Of An Imu Based Measurement System For The Determination Of The Subtalar Joint Axis, Anja Seeger, Wilfried Alt
The Development Of An Imu Based Measurement System For The Determination Of The Subtalar Joint Axis, Anja Seeger, Wilfried Alt
ISBS Proceedings Archive
The subtalar joint axis influences biomechanical variables, especially regarding the lower limbs. The purpose of this study was to develop a measurement system for the subtalar joint axis based on inertial measurement units. Different development steps were taken, like an axis estimation algorithm using a principal component analysis and multiple approaches for the reference of the subtalar joint axis to the anatomical coordinate system. In the current development step, we try to solve the reference problem by using fused IMU data to track the offset to the foots longitudinal axis. As of now it is possible to determine the axis …
Spring-Mass Model Symmetry Characteristics In Distance Runners Across A Competitive Season, Isabella Vargas-Blanchard, Riley Schemel, Alexis M. Arena, Monique Mokha
Spring-Mass Model Symmetry Characteristics In Distance Runners Across A Competitive Season, Isabella Vargas-Blanchard, Riley Schemel, Alexis M. Arena, Monique Mokha
ISBS Proceedings Archive
This study aimed to apply characteristics of the spring-mass model (SMM) to distance running over a competitive season by measuring changes in landing-takeoff and rebound asymmetries. Thirteen runners from the same university team underwent 3D biomechanical gait analyses at the start and end of a 7-week competitive season. Paired-sample t-tests compared landing-take-off asymmetry [effective contact time (tce) to aerial time (tae)], rebound asymmetry [positive work time (tpush), to negative work time (tbrake), and average vertical ground reaction force (vGRF). Rebound asymmetry increased by 4%, but was not significant, t(12)=-1.239, p=0.239. Landing-take-off …
Standing Long Jump Power Estimation From Smartphone Imus, Beatrice De Lazzari, Giuseppe Vannozzi, Valentina Camomilla
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. …
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 …
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 …
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 …
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 …
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 …
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. …
Gait Event Detection During Walking Using Deep Learning And Thigh-Worn Accelerometry, Claas Lendt, Tom Stewart
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. …
Forefoot Bending Stiffness In The Bobsleigh Push-Start, Jan-Peter Goldmann, Johanna Pohlen, Marvin Zedler
Forefoot Bending Stiffness In The Bobsleigh Push-Start, Jan-Peter Goldmann, Johanna Pohlen, Marvin Zedler
ISBS Proceedings Archive
The purpose of this study was to investigate how forefoot bending stiffness (Kcr) changes with speed across the bobsleigh push-start. Kinematics and kinetics of 15 elite athletes were measured on an indoor track during different phases (Contact 1 & 2, 10 m, 30 m) of the bobsleigh push-start using a MoCap-System and three force plates. Metatarsophalangeal joint (MPJ) angles, moments and Kcr were calculated via MATLAB. In contrast to sprinting, maximum MPJ moments, moments at maximum MPJ dorsiflexion and Kcr showed no significant differences (p > 0.05) about the push-phase due to the inter-individual variations between the …
Thigh Muscle Activity In Experienced Female Handball Players During Preplanned And Unplanned Sidestep Cuts, Kevin Bill, Patrick Mai, Tron Krosshaug, Uwe G. Kersting
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 …
Advancing Aquatic Motion Tracking Through Multi-Sensor Data Fusion Surfing The Giant Waves Of Nazaré – Study Case, Marcio Borgonovo-Santos, Damian Perez, Miguel Sanches, Daniela Lopes
Advancing Aquatic Motion Tracking Through Multi-Sensor Data Fusion Surfing The Giant Waves Of Nazaré – Study Case, Marcio Borgonovo-Santos, Damian Perez, Miguel Sanches, Daniela Lopes
ISBS Proceedings Archive
As we delve into the diverse applications of motion tracking from Space to Air and Land, we encounter distinct challenges and opportunities. However, the most significant arise in the aquatic domain, particularly in the maritime environment. The unique characteristics of water behaviour demand novel solutions for accurately tracking and interpreting movement in this dynamic environment. An outstanding outcome of my Sports Sciences PhD was the Fluid Flow Sensor. This groundbreaking multi-sensor innovation enables tracking data considering water flow, expanding research horizons of analytics in water sports. Notably, the technology showcased its exceptional potential through a successful pilot study during a …
Effect Of Resisted Sled Sprint Training On Sprinting Abilities Of Junior High School Students, Takeru Hamamichi, Kiyotaka Naoi, Susumu Shigeta, Shin-Ichiro Moriyama
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 …
Amateur Boxing Coaches Perceptions Of The Technical Components Of Straight Punches, Raph Britton, Richard Bolger, Michael Hanlon, Robin Healy, Kris Beattie, Gregory Tierney
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 …
Testing Injury Risk In Acl-Reconstructed Football Players On The Field: A Practical Tool To Assess Cutting Biomechanics Through Wearable Sensors, Stefano Di Paolo, Marianna Viotto, Alberto Grassi, Laura Bragonzoni, Stefano Zaffagnini
Testing Injury Risk In Acl-Reconstructed Football Players On The Field: A Practical Tool To Assess Cutting Biomechanics Through Wearable Sensors, Stefano Di Paolo, Marianna Viotto, Alberto Grassi, Laura Bragonzoni, Stefano Zaffagnini
ISBS Proceedings Archive
The aim of the present study was to inspect differences between healthy and ACLR football players through a kinematic on-field assessment of cut manoeuvres. 62 (47 healthy, 15 ACLR) were enrolled. The players performed planned 90° changes of direction and unplanned football-specific changes of direction. Kinematics was collected through 8 wearable inertial sensors (MTw Awinda, Xsens). Healthy and ACLR players differed in hip and knee rotation during the entire cut phase (p
Softball Players With Shoulder Injuries Exhibit Upper-Body Compensatory Strategies Compared To Healthy Controls: A Wearable Inertial Sensors Study, Raffaele Zinno, Stefano Di Paolo, Maxime Hoyaux, Alisea Minardi, Laura Bragonzoni
Softball Players With Shoulder Injuries Exhibit Upper-Body Compensatory Strategies Compared To Healthy Controls: A Wearable Inertial Sensors Study, Raffaele Zinno, Stefano Di Paolo, Maxime Hoyaux, Alisea Minardi, Laura Bragonzoni
ISBS Proceedings Archive
The aim of the study was to assess the kinematic differences in the upper limb and trunk between healthy and shoulder-injured softball players. Eleven first-division softball players (mean age 25.9±8.1) were enrolled. Five players experienced a shoulder injury with consequent surgery. The players were assessed while performing a standard throw, from the moment when they pick up a ball on the ground (Pick-up Phase) to the complete throw (Pass Phase), using 11 wearable inertial sensors (Xsens MTw Awinda). Peak joint kinematics and range of motion (ROM) were analysed. The shoulder-injured players showed less shoulder internal/external rotation (p
Analysis Of Gaze Behavior And Electromyography During Nihon Kendo Kata, Minato Kawaguchi, Riku Watanabe, Shun Uehara, Kanta Uesawa, Kentaro Takahashi
Analysis Of Gaze Behavior And Electromyography During Nihon Kendo Kata, Minato Kawaguchi, Riku Watanabe, Shun Uehara, Kanta Uesawa, Kentaro Takahashi
ISBS Proceedings Archive
This study aims to elucidate whether the gaze strategies of performers in Nihon Kendo kata and the muscle activity involved in gripping the sword depend on skill level. Six college-aged students participated, three having over 14 years of experience and the remaining three being novices. A wearable eye-tracking device was employed, and the surface electromyography (EMG) of the flexor digitorum profundus was recorded. We calculated objective features and applied a two-way ANOVA. As a result, a main effect of the expertise level was observed for the number and duration of fixations, the average acceleration obtained from eye movement, and the …
Determination Of Gait Events From 2d Video Using Long Short-Term Memory Neural Networks, Marion Mundt, Steffi Colyer, Jacqueline Alderson
Determination Of Gait Events From 2d Video Using Long Short-Term Memory Neural Networks, Marion Mundt, Steffi Colyer, Jacqueline Alderson
ISBS Proceedings Archive
The purpose of this study was to automatically identify the key gait events, foot-strike and foot-off, from 2D video data. Markerless motion capture and pose estimation have become accepted tools in many biomechanics applications to automatically analyse 2D videos of human movement. However, the accurate detection of gait events from various camera views is still a challenge. We trained a long short-term memory neural network to identify foot-strike and foot-off events in walking and running trials captured from nine different camera views based on 2D pose estimation keypoint labels. We achieved a detection accuracy of 86.3-96.1% (F1 score 76.2-92.5%). These …
The Relationship Between Neurocognition And Side-Step Cutting Biomechanics In Women’S Australian Football Players, Tess L. Rolley Miss, Natalie Saunders, Ashlee Hendy Mrs, Brendan Major Mr, Alicia Goodwill Mrs, Sandy Shultz Mr, Aaron Fox Mr
The Relationship Between Neurocognition And Side-Step Cutting Biomechanics In Women’S Australian Football Players, Tess L. Rolley Miss, Natalie Saunders, Ashlee Hendy Mrs, Brendan Major Mr, Alicia Goodwill Mrs, Sandy Shultz Mr, Aaron Fox Mr
ISBS Proceedings Archive
Despite increased awareness and targeted efforts, anterior cruciate ligament (ACL) injuries continue to frequently occur within the women’s Australian-rules football league (AFLW). AFLW ACL injuries frequently occur when performing a defensive side-step cut. Considering the reactive nature of this scenario, neurocognitive function may be an important risk factor. Therefore, the purpose of this study was to investigate the relationship between neurocognition and side-step cutting biomechanics in women’s Australian football players. Relationships between neurocognitive measures and 3D knee loads during unanticipated side-stepping were examined. No statistically significant relationships were found. These findings provide recommendations for future research to explore different cognitive …
Kinematic Comparison Of Opencap And Imu With Marker-Based Motion Capture In Treadmill Running: A Pilot Study, Muhammad Nur Shahril Iskandar Mr, Phillis Soek Po Teng Dr
Kinematic Comparison Of Opencap And Imu With Marker-Based Motion Capture In Treadmill Running: A Pilot Study, Muhammad Nur Shahril Iskandar Mr, Phillis Soek Po Teng Dr
ISBS Proceedings Archive
The purpose of this pilot study was to compare lower-limb running kinematics measured using a markerless system, OpenCap, and inertial measurement units (IMUs) against the marker-based motion capture (mocap) system. One participant ran at 2.22 m/s on a treadmill for one minute. Mean absolute error (MAE) and root mean square error (RMSE) of hip, knee, and ankle flexion were calculated independently for all 3 devices. Time synchronization of devices was facilitated by performing a ‘kick’ and identifying its peak knee angle prior to running. Offset correction was also applied to OpenCap and IMUs data to match those of marker-based mocap …
Countermovement Jump Performance Variables Correlate With Weightlifting Performance In Elite Participants, Christopher Geiser, Nayun Ahn, Kristof Kipp
Countermovement Jump Performance Variables Correlate With Weightlifting Performance In Elite Participants, Christopher Geiser, Nayun Ahn, Kristof Kipp
ISBS Proceedings Archive
It is valuable to monitor athletes’ training efficacy to better guide their conditioning and performance programs. In weightlifting, assessing 1RM routinely may require longer recovery and limit training. The purpose of this study was to identify associations between 1RM weightlifting performance and variables calculated from a maximal countermovement jump (CMJ). Force data were collected and variables calculated for seven elite weightlifters during CMJs. Maximum rate-of-force development (RFD) during the countermovement jump was associated with both Snatch (r^2 0.56, p=0.05) and Clean & Jerk (C&J) (r^2=0.49, p=0.08) performance. Eccentric time (r^2=0.55, p=0.06) and ecc-conc ratio (r^2=0.68, p=0.02) were correlated with C&J …
Overweight And Underweight Implements’ Impact On Critical Factors Of Rotational Shot-Putting Technique, Leah N. Klein, James Becker, Justin Whitten, Megan Peach
Overweight And Underweight Implements’ Impact On Critical Factors Of Rotational Shot-Putting Technique, Leah N. Klein, James Becker, Justin Whitten, Megan Peach
ISBS Proceedings Archive
The purpose of this study was to evaluate the impacts of heavy and light implements on the kinematics of the rotational shot put technique. Ten collegiate shot putters completed three rotational shot put attempts using competition, overweight and underweight implements. Whole body kinematics were recorded on each throw to evaluate key aspects of shot putting technique including pelvis-torso separation, rear leg hip flexion, rear leg knee flexion, and peak pelvis angular velocity during specific phases of the throw. Results of this study highlight that when using an overweight implement, athletes have significantly less hip flexion compared to the competition-weighted implement …
Association Between Morphology And Hip And Knee Joint Reaction Forces During Running In American Football Players: Implications For Osteoarthritis Development, Monique Mokha, Sean Mcbride, Jacob Haberer, Johnathan Polletta, Nicole Branum, Marissa Bonsangue, Andrew Schafer, Jack Stensland, Nivene Hojeij, Elie Christoforides
Association Between Morphology And Hip And Knee Joint Reaction Forces During Running In American Football Players: Implications For Osteoarthritis Development, Monique Mokha, Sean Mcbride, Jacob Haberer, Johnathan Polletta, Nicole Branum, Marissa Bonsangue, Andrew Schafer, Jack Stensland, Nivene Hojeij, Elie Christoforides
ISBS Proceedings Archive
National Football League (NFL) American football players are exposed to osteoarthritis risk factors of obesity and high joint loads. We sought to examine the association between total body mass (TBM), lean body mass (LBM), body fat percent (BFP), peak compressive hip and knee joint reaction forces (JRF), and vertical ground reaction forces (vGRF) in NFL draft eligible players during a high-speed run. One-hundred twenty-five participants ran at 6.5 m/s for 5 sec on an instrumented treadmill. Results showed moderate to low significant negative associations between TBM, LBM, and vGRF and hip and knee compression JRF. There was a negligible significant …