Open Access. Powered by Scholars. Published by Universities.®

Digital Commons Network™

Open Access. Powered by Scholars. Published by Universities.®

Discipline
Institution
Keyword
Publication Year
Publication
Publication Type
File Type

Articles 123511 - 123540 of 5154368

Full-Text Articles in Entire DC Network

The Effect Of (Acceleration-Deceleration) Exercise Whith Moderate Intensity In Small Spaces On The Strength Of Hamstrings In Football Players, Kamel Nettah, Abdelkader Belkheir, Rabah Seghiri, Derradji Aroussi Nov 2025

The Effect Of (Acceleration-Deceleration) Exercise Whith Moderate Intensity In Small Spaces On The Strength Of Hamstrings In Football Players, Kamel Nettah, Abdelkader Belkheir, Rabah Seghiri, Derradji Aroussi

ISBS Proceedings Archive

The purpose of this study is to examine the effect of acceleration-deceleration exercise in small spaces on the strength of the hamstring muscle and ideally prevent it from a possible injury. A significant number of previous studies have shown that the negative effect of exercises using acceleration and deceleration on hamstring injury is due to the maximum use of intensity. Instead, in this study we have used moderate intensity in small spaces. on The idea was that acceleration-deceleration exercises have the same mechanism of contraction(contracting and extending) with strength training despite the different way they function, and through that development …

Go to article

Biomechanical Analysis Of Elite Javelin Thrower Of Pakistan, Muhammad Tahir Nazeer Dr, Muhammad Ahmad Tahir, Rabia Walee Nov 2025

Biomechanical Analysis Of Elite Javelin Thrower Of Pakistan, Muhammad Tahir Nazeer Dr, Muhammad Ahmad Tahir, Rabia Walee

ISBS Proceedings Archive

This study investigated the biomechanical factors influencing javelin throwing performance among elite Pakistani athletes. Eight national-level male throwers were analyzed using 3D motion capture during the 2024 National Athletics Championships. Key variables included release velocity components, approach run velocity, pull distance, and phase durations. Results showed that vertical release velocity and approach run velocity at right foot touchdown (R-on) were significantly correlated with throwing distance (r = 0.672, p < .05 and r = 0.596, p < .05, respectively). No significant correlations were observed for pull distance, step length, or phase durations. Findings suggest that elite performance relies on maximizing vertical release while maintaining sufficient horizontal speed, emphasizing the importance of individualized technical training in Pakistan’s javelin development programs.

Go to article

The Effect Of Baseball Bat Diameter On Batted Ball, Hirotaka Nakashima Nov 2025

The Effect Of Baseball Bat Diameter On Batted Ball, Hirotaka Nakashima

ISBS Proceedings Archive

The purpose of this study was to investigate the effect of bat diameter on the batted ball characteristics in baseball. A custom-made bat swing machine swung bat horizontally and hit a ball floating in the air using wind pressure. Three bats of different diameter (6.30 cm, 5.73 cm, and 5.32 cm) were used with 30 trials per bat. Three high-speed video cameras were used to record the movements of the bat and ball near the impact and compared the batted ball characteristics. As a result, bat diameter did not appear to have a significant effect on batted balls.

Go to article

Development Of Sprint Running Performance Over 4 Years: A Case Study, Ryu Nagahara, Masataka Yamashita Nov 2025

Development Of Sprint Running Performance Over 4 Years: A Case Study, Ryu Nagahara, Masataka Yamashita

ISBS Proceedings Archive

The purpose of this study was to identify changes in the kinematics and kinetics of sprinting through the development of sprint performance in a male sprinter over four years. In the experiment, a male sprinter performed a 60-m sprint during which ground reaction forces and running motion were measured using a long force platform system and a motion capture system, respectively. The participant improved his 200-m personal record by 1.17 s over the four years. The characteristics of changes in the kinematics and kinetics of sprinting varied across the years. A decrease in knee extension torque during the support phase …

Go to article

Estimation Of The Ground Reaction Forces During Golf Swing Using Recurrent Neural Networks, Kanji Mori Nov 2025

Estimation Of The Ground Reaction Forces During Golf Swing Using Recurrent Neural Networks, Kanji Mori

ISBS Proceedings Archive

Accurate ground reaction force (GRF) measurement is essential for in-depth golf swing analysis, but force plates are costly and require complex installation. This study develops an AI-based GRF estimation method using a Bi-LSTM model. Motion capture and force plate data from 1,032 swings by 344 golfers were used to train the model, while data from 29 unseen golfers were reserved for validation to prevent overfitting. A total of 864 models were trained using cross-validation and grid search, with the best-performing model selected based on ICC. The model achieved high accuracy (ICC up to 0.983), particularly for lead foot vertical GRF. …

Go to article

Joint Power Differences In Speed Running Between American Style Football Position Groups, Monique Mokha, Alyana Andal Andal, Jacob Haberer, Isabella Estrada Hernandez, Hunter Forte Nov 2025

Joint Power Differences In Speed Running Between American Style Football Position Groups, Monique Mokha, Alyana Andal Andal, Jacob Haberer, Isabella Estrada Hernandez, Hunter Forte

ISBS Proceedings Archive

We tested lower limb joint power during a treadmill run of 54 American style football players preparing for league try-outs where 40-yard (36.6 m) dash performance is critical. Players represented 3 position groups: Big (e.g., linemen), Big skill (e.g., tight ends), and Skill (e.g., receivers) groups, reflecting their varying play demands, from blocking/tackling to sprinting/cutting. MANOVA showed significant group differences in joint power, F(24,80) = 2.917, p < .001; Wilk’s λ = .285, partial η² = .467. ANOVA and post-hocs revealed Skill players generated more total limb power than Big (p < .001) and absorbed more ankle power than Big (p < .001), but not Big skill (p > .017). Big absorbed more right hip power than …

Go to article

The Halfpipe Lines Of The 2022 Men's Olympic Snowboard Finalists: An Explorative Analysis, Christian Merz, Felix Friedl, Matthias Thelen, Tom Gorges Nov 2025

The Halfpipe Lines Of The 2022 Men's Olympic Snowboard Finalists: An Explorative Analysis, Christian Merz, Felix Friedl, Matthias Thelen, Tom Gorges

ISBS Proceedings Archive

The purpose of this exploratory study was to visualize and describe the halfpipe lines of the 2022 Men’s Olympic Snowboard finalists using an ultra-wideband positioning system. Riders choose the line to gain speed and prepare the take-off to perform tricks. From a bird's eye view the lines from riders' right wall to riders' left wall has a shape similar to a negative hyperbolic tangent. The return path – from the left wall to the right wall - resembles a hyperbolic tangent. On average the 92 lines cover 18.93 ± 2.33 m in x-direction. Thereby the mean riding from landing to …

Go to article

Development And Validation Of An Algorithm For Foot Contact Detection In High-Dynamic Movements Using Inertial Measurement Units, Margherita Mendicino, Stefano Di Paolo, José Miguel Dos Santos, Eline M. Nijmeijer, Pieter Heuvelmans, Francesco Della Villa, Alli Gokeler, Anne Benjaminse, Stefano Zaffagnini Nov 2025

Development And Validation Of An Algorithm For Foot Contact Detection In High-Dynamic Movements Using Inertial Measurement Units, Margherita Mendicino, Stefano Di Paolo, José Miguel Dos Santos, Eline M. Nijmeijer, Pieter Heuvelmans, Francesco Della Villa, Alli Gokeler, Anne Benjaminse, Stefano Zaffagnini

ISBS Proceedings Archive

Wearable IMUs offer a promising alternative to lab-based motion capture for sports biomechanics. Accurate foot contact detection (FCD) is crucial, yet most algorithms are validated for daily activities, leaving a gap in high-dynamic movements, such as sprints and changes of direction, which are linked to injury risk. This study (I) reviews FCD algorithms for such tasks and (II) develops a new IMU-based algorithm for detecting initial contact (IC) and toe-off (TO). The review highlighted limitations in sport-specific FCD solutions. Two algorithms using Pelvis Vertical Velocity (PVV) and Resultant Foot Acceleration (RFA) were tested on 302 trials. A hybrid approach combining …

Go to article

Formation Of Coordination Among Release Parameters For The Shape Of Variability In Arrival Positions Over Practice, Ryota Matsuda, Jun Umakoshi, Arata Kimura Nov 2025

Formation Of Coordination Among Release Parameters For The Shape Of Variability In Arrival Positions Over Practice, Ryota Matsuda, Jun Umakoshi, Arata Kimura

ISBS Proceedings Archive

This study aims to propose a framework for analyzing coordination among release parameters in relation to the shape of variability in performance outcomes and to investigate how such coordination is formed through practice. Participants threw 60 darts toward the center of the dartboard, twice a week for 10 weeks. Intersection over Union (IoU) was used to quantify coordination for the shape of variability, and a threshold was established to define the presence of coordination. The results showed that coordination among release parameters was not necessarily developed through practice, and that such coordination may already be structured before reducing the magnitude …

Go to article

Wearable Technology Detects Altered Cod Strategies In Football Players Post-Aclr Without Impacting Completion Time., Joao Marques Nov 2025

Wearable Technology Detects Altered Cod Strategies In Football Players Post-Aclr Without Impacting Completion Time., Joao Marques

ISBS Proceedings Archive

This study examines COD performance and biomechanics in professional football players with a history of ACLR compared to healthy controls, using wearable technology. Kinematics and vertical force were recorded during 90° side-step cutting. Mixed model analysis and Statistical Parametric Mapping compared COD completion time, kinetics, and kinematics between limbs and groups. No significant differences were found in COD time between limbs (p = 0.52) or groups (p = 0.65). However, the involved limb showed greater ankle dorsiflexion and lower vertical force during the penultimate contact (p = 0.002). The involved limb also showed lower knee flexion angles during the plant …

Go to article

Differences In Trunk And Hip Isokinetic Strength Performance Among Cheerleaders With Varying Somersault Technical Levels, Yi-Zhu Liao, Shih-Chung Cheng, Wen-Tzu Tang Nov 2025

Differences In Trunk And Hip Isokinetic Strength Performance Among Cheerleaders With Varying Somersault Technical Levels, Yi-Zhu Liao, Shih-Chung Cheng, Wen-Tzu Tang

ISBS Proceedings Archive

啦啦隊中的站立後空翻 (SBTS) 需要精確的速度控制和軀幹-臀部協調，並依靠特定肌肉的力量。雖然 SBTS 通常可以實現，但更高級的站立全空翻 (SF) 需要更大的力量。這項研究評估了 17 名啦啦隊在 3 種不同速度（軀幹：30-120°/s；臀部：60-300°/s）下的軀幹和臀部等速力量。參與者根據技能分組：僅 SBTS（NSF，n = 9）和同時進行 SBTS 和 SF（SF，n = 8）。雙向變異數分析顯示 SF 組的髖部屈曲峰值扭矩明顯較大（p < .05）。髖部伸展的顯著交互作用顯示 NSF 中 300°/s 和 180°/s 時的扭矩下降（p < .05），而在 SF 中沒有觀察到。研究結果強調了強大的髖屈肌和保持高速髖伸展對於空翻動作的重要性，為有針對性的啦啦隊訓練提供了指導。

Go to article

Effect Of Hamstring Strength Intervention On Lower Extremity Biomechanics Of Sprinting, Shangxiao Li, Weiya Hao, Shufang Yuan Nov 2025

Effect Of Hamstring Strength Intervention On Lower Extremity Biomechanics Of Sprinting, Shangxiao Li, Weiya Hao, Shufang Yuan

ISBS Proceedings Archive

The purpose of this study was to examine the effects of hamstring strength intervention on the lower extremity biomechanics. Fourteen college students volunteered to participate in this study, and underwent three weekly sessions of hamstring strength intervention for eight weeks. Three-dimensional kinematic and kinetic data during a sprint test (40 m) were collected before and after the intervention. The hip flexion angle, knee flexion angle at touch down and peak knee flexion angle instant, and peak knee extension moment during stance phase showed significant decreases in the post-intervention test compared to the pre-intervention test. The hip and knee joints were …

Go to article

Shoulder Kinematics Of Overhead Throwing In Male Professional And Semi-Professional Cricketers, Jordan Leondiris Mr., Janine Gray Dr., Megan Dutton Dr., Yumna Albertus Associate Prof. Nov 2025

Shoulder Kinematics Of Overhead Throwing In Male Professional And Semi-Professional Cricketers, Jordan Leondiris Mr., Janine Gray Dr., Megan Dutton Dr., Yumna Albertus Associate Prof.

ISBS Proceedings Archive

Throwing in sports is one of the most aggressive and vigorous actions performed by the upper extremity. The purpose of this study was to investigate overhead throwing shoulder kinematics between two different throwing approaches in cricket, throwing from a static versus dynamic position following a run-up. The study sample included twenty (N=20) male professional/semi-professional cricketers. Shoulder kinematic variables were investigated during two different throwing approaches. Dynamic throwing produced significantly greater ball velocity than static throwing. However, shoulder internal rotation velocities at ball release showed no significant differences across static versus dynamic conditions and shoulder kinematics remained largely consistent, except for …

Go to article

The Effect Of Augmented Reality Glasses On Elderly And Young Adults – A Preliminary Study, Sangyup Lee, Melissa Mache, Chengtu Hsieh Nov 2025

The Effect Of Augmented Reality Glasses On Elderly And Young Adults – A Preliminary Study, Sangyup Lee, Melissa Mache, Chengtu Hsieh

ISBS Proceedings Archive

Falls are a major concern among older adults, often linked to gait adaptations influenced by aging and environmental factors. This study examined the effects of augmented reality (AR) glasses on gait in young and older adults under three conditions: walking without AR glasses (W/O), with AR glasses (AR), and with AR glasses while performing a cognitive task (AR + CQ). Twelve participants (six younger, six older) walked on a treadmill at their preferred speed while gait was analysed using OpenCap. Compared to younger adults, older adults exhibited shorter stride length and narrower step width under AR conditions. Younger adults showed …

Go to article

Head Impact Differences Between Male And Femal Judo Practitoners During Sparring Practice: A Secondary Analysis Of An Exploratory Study, Sentaro Koshida, Takanori Ishii, Hiroshi Kubota, Tatsunari Hasegawa, Chinami Nakagawara, Hiroshi Churei Nov 2025

Head Impact Differences Between Male And Femal Judo Practitoners During Sparring Practice: A Secondary Analysis Of An Exploratory Study, Sentaro Koshida, Takanori Ishii, Hiroshi Kubota, Tatsunari Hasegawa, Chinami Nakagawara, Hiroshi Churei

ISBS Proceedings Archive

Although judo carries a high risk of head injuries, primarily due to throws, empirical data on head impact characteristics during sparring practice remains limited. This study examined differences between males and females in head impact frequency and magnitude among collegiate judo practitioners. Nine athletes were monitored using mouthguard-type inertial sensors to measure head linear and rotational accelerations during practice. Generalized linear mixed models (GLMMs) estimated that head impact frequency was higher in female practitioners (10.9 impacts/hour; 95% CI: 4.8–25.0) compared to males (3.7 impacts/hour; 95% CI: 1.4–9.5; rate ratio: 2.96, p = 0.09). In contrast, model-estimated peak linear acceleration (PLA) …

Go to article

A Pilot Study To Evaluate Sagittal Kinematic Variables In Accelerated Run Using Openpose Markerless Motion Capture System, Mizuki Kitamura, Mitsuo Otsuka Nov 2025

A Pilot Study To Evaluate Sagittal Kinematic Variables In Accelerated Run Using Openpose Markerless Motion Capture System, Mizuki Kitamura, Mitsuo Otsuka

ISBS Proceedings Archive

This study evaluated the agreement between OpenPose markerless and marker-based methods in analyzing sprint start performance. Four male students performed ten sprint starts. The Bland-Altman test for average center of mass (COM) horizontal velocity from the beginning motion to 1-m position of the OpenPose markerless method showed a fixed bias of -0.02 m/s, 95% limits of agreement (LoA) from −0.10 to 0.06 m/s, and a proportional bias of r = −0.47. For the 1-m running time, fixed bias was −0.00 s, 95% LoA ranged from −0.09 to 0.09 s, and proportional bias was r = 0.39. In the calculation of …

Go to article

Biomechanical Analysis Of Standing Long Jump For Different Focus Of Attention, Arata Kimura Nov 2025

Biomechanical Analysis Of Standing Long Jump For Different Focus Of Attention, Arata Kimura

ISBS Proceedings Archive

The purpose of this study was to examine the kinematics of the center of mass (COM) under varying attentional focus conditions during the standing long jump. Participants performed jumps under three focus conditions: control, internal focus, and external focus. The findings showed no statistically significant differences in jump distances across conditions. However, for most participants, the shortest jump distance was not observed under the external focus condition. The number of participants who showed the shortest jump distance in the external focus condition was 1 out of 14. These results suggest that external focus of attention can prevent poor jump performance …

Go to article

Can A New Rule Adapted Takeoff Zone Improve Approach-Run And Takeoff Motions In Long Jump?, Yosuke Kido, Mizuki Kitamura, Fumiaki Kobayashi, Mitsuo Otsuka Nov 2025

Can A New Rule Adapted Takeoff Zone Improve Approach-Run And Takeoff Motions In Long Jump?, Yosuke Kido, Mizuki Kitamura, Fumiaki Kobayashi, Mitsuo Otsuka

ISBS Proceedings Archive

The aim of this study was to clarify the effect of implementing the new long-jump rule with a takeoff zone, which is currently proposed by World Athletics, on the approach-run and takeoff movements. Ten male collegiate jumpers specializing in horizontal jumping events participated in the experiment. The main finding was no significant difference of effective distances was observed between the proposed and conventional trials. This may due to the fact that no significant differences of maximal horizontal center of mass (COM) velocity, horizontal COM velocity at the landing of takeoff, and takoff angle were observed between the proposed and conventional …

Go to article

Characterizing Cardiac-Locomotion Synchronization And Heart Rate/Gait Cycle Fluctuations: A Pilot Study, Minato Kawaguchi, Kousuke Meguro, Kentaro Takahashi Nov 2025

Characterizing Cardiac-Locomotion Synchronization And Heart Rate/Gait Cycle Fluctuations: A Pilot Study, Minato Kawaguchi, Kousuke Meguro, Kentaro Takahashi

ISBS Proceedings Archive

This study investigated cardiac-locomotion synchronization (CLS) during indoor treadmill and outdoor free walking, examining its environmental differences and relationships with heart rate/gait rhythm variability. Twelve participants used wearable ECG and accelerometer sensors for data collection during self-paced brisk walking. We analysed the last 10 minutes of stable walking, calculating mean period, coefficient of variation, and detrended fluctuation analysis (DFA) slope α. CLS was quantified by the 'Sync rate', the temporal proportion of consistent gait cycle to R-R interval ratios. Results showed significantly higher Sync rates in outdoor walking. Outdoor gait rhythm fluctuation α tended to decrease with increased Sync rate. …

Go to article

Comparison Of Thorax And Pelvis Motion During Iron Club Golf Swing Between Female And Male Skilled Golfers, Karolina Kanova, Jiri Skypala, Pavel Brtva, Roman Farana Nov 2025

Comparison Of Thorax And Pelvis Motion During Iron Club Golf Swing Between Female And Male Skilled Golfers, Karolina Kanova, Jiri Skypala, Pavel Brtva, Roman Farana

ISBS Proceedings Archive

This study compared thorax and pelvis biomechanics in male and female golfers using an iron club, analysing eight skilled golfers (4 female, 4 male) with over 10 years of experience and a handicap below 10. The aim was to compare the biomechanics and movement variability of thorax and pelvis motion during the golf swing between genders. Biomechanical analysis was conducted using a combination of marker-based and markerless motion capture systems, focusing on the downswing. Results showed gender- based differences in 3D angular displacement, with significant movement variability in pelvic lateral tilt across all downswing phases (top of backswing, mid-downswing, and …

Go to article

The Stability Of Variability – Multiday Reliability Of Sample Entropy In Submaximal Hop And Strength Tasks In Elite Athletes, Daniel Kadlec, Jake Cowin, Kat Daniels, Matthew J Jordan, Matt Miller-Dicks, Shayne Vial, Sophia Nimphius Nov 2025

The Stability Of Variability – Multiday Reliability Of Sample Entropy In Submaximal Hop And Strength Tasks In Elite Athletes, Daniel Kadlec, Jake Cowin, Kat Daniels, Matthew J Jordan, Matt Miller-Dicks, Shayne Vial, Sophia Nimphius

ISBS Proceedings Archive

The purpose of this study was to determine the multiday reliability in submaximal continuous hops and submaximal isometric squats from the ground reaction force signals. Twelve elite team-sport athletes completed submaximal isometric squats at 40% and 60% of their maximal voluntary isometric contraction and submaximal continuous hopping at 2 Hz, 2.5 Hz, and a self-selected frequency for 30 s, respectively, over four sessions. Sample entropy was calculated from the force-time data. Good-to-excellent reliability (ICC2,k > 0.75) was observed for submaximal hopping frequencies (Hop2.0, Hop2.5) following one session and for isometric squats at 60% MVIC from the initial session. These data …

Go to article

Simulating The Effect Of Measurement Error On Stride Time Detrended Fluctuation Analysis, Ben D. M. Jones, David L. Carey, Jon Wheat, Kane Middleton, Ben Heller Nov 2025

Simulating The Effect Of Measurement Error On Stride Time Detrended Fluctuation Analysis, Ben D. M. Jones, David L. Carey, Jon Wheat, Kane Middleton, Ben Heller

ISBS Proceedings Archive

The aim of this study was to investigate the sensitivity of running stride time detrended fluctuation analysis (DFA) to simulated noise and the impact of noise on reliability measures. Varying magnitudes of Gaussian and uniform noise were added to series of touchdown event timings from 11 runners. DFA-α were calculated for ground truth and simulated stride time series. Simulated series were paired and test-retest ICC estimates computed. The error in DFA-α increased with noise magnitude, with stride time series transitioning from persistent to anti-persistent behaviour for greater magnitudes of noise. However, median ICC estimates stayed above 0.95 for all standard …

Go to article

The Relationship Between Vertical Jump Height And Residual Force Depression In Knee Extensors, Iseul Jo, Hae-Dong Lee Nov 2025

The Relationship Between Vertical Jump Height And Residual Force Depression In Knee Extensors, Iseul Jo, Hae-Dong Lee

ISBS Proceedings Archive

This study investigated the relationship between vertical jump performance and history-dependent muscle force depression. Maximum isometric knee extension torque was measured following a stretch-shortening cycle (SSC) or shortening-only (SHO) contraction and compared to a reference isometric contraction (ISO) at 20°. Residual force depression (rFD) was observed as 14.5% after SSC and 4.9% after SHO. Squat jump (SJ) height was positively correlated with peak concentric torque in the SHO–ISO condition, whereas countermovement jump (CMJ) height showed no significant relationship. Both jump heights showed strong positive correlations with rFD, suggesting that individuals with greater rFD tended to achieve higher jump performance. These …

Go to article

Integrating System Dynamical Principles Of Motor Learning In A Biomechanic Training System In Rowing, Thomas Jaitner, Kevin Nolte Nov 2025

Integrating System Dynamical Principles Of Motor Learning In A Biomechanic Training System In Rowing, Thomas Jaitner, Kevin Nolte

ISBS Proceedings Archive

Measurement and information technologies for the optimization of movement technique are well established in high performance sports. While measurement technologies and biomechanical aspects of sport performance are well investigated, the underlying models for technique training do not represent the state of research in motor learning and therefore have been criticized. The aim of this study was to evaluate the effects of a biomechanic training device based on system-dynamics principles of motor learning in high-performance rowing. Eight elite rowers completed a three-week training experiment in which the intervention group had to replicate varying strength curves. All subjects in the intervention group …

Go to article

Changes In Arm And Leg Swing During A 400 M Sprint, Ryo Iwasaki, Sakie Nobuoka Nov 2025

Changes In Arm And Leg Swing During A 400 M Sprint, Ryo Iwasaki, Sakie Nobuoka

ISBS Proceedings Archive

The present study aimed to clarify the changes in arm and leg swing between the early and late phases of a 400 m sprint. Nine male and eight female sprinters performed a 400 m sprint at maximum effort. Inertial measurement units were attached to the distal thighs and forearms to quantify arm and leg swing. Segmental angular data were analysed and compared between the early and late phases of the sprint. Leg swing amplitude was significantly reduced in the late phase compared to the early phase (average %Δ = -48.8), whereas arm swing amplitude increased (average %Δ = +160.8), and …

Go to article

Theoretical Analysis Of The Addition Effect Of Knee Flexion And Extension Movement Of The Swinging Leg On Horizontal Velocity In Men-Uchi: Comparison With Experimental Data, Shunngo Itai, Nobuyuki Sakai, Toshiyuki Kurihara Nov 2025

Theoretical Analysis Of The Addition Effect Of Knee Flexion And Extension Movement Of The Swinging Leg On Horizontal Velocity In Men-Uchi: Comparison With Experimental Data, Shunngo Itai, Nobuyuki Sakai, Toshiyuki Kurihara

ISBS Proceedings Archive

剣道は日本の伝統武道一つであり、最も基本的な技は面打ちである。 この動作において踏み出し足となる右足の動作に関する研究はほとんど行われていない。 本研究は、右膝の適切な屈曲のタイミングと角度を見極めることを目的とする。体験者3名が面打ち動作の測定のために採用され、右膝の角度と両足の間の角度が測定された。

Go to article

Validity Of A Velocity-Based Training Device For Assessing Peak Force, Velocity, And Power In Medicine Ball Throws: A Pilot Study, Kazuhiro Ishimura Nov 2025

Validity Of A Velocity-Based Training Device For Assessing Peak Force, Velocity, And Power In Medicine Ball Throws: A Pilot Study, Kazuhiro Ishimura

ISBS Proceedings Archive

This pilot study examined the validity of a wearable VBT device for measuring peak velocity, force, and power during vertical medicine ball throws. Two participants each performed nine throws while wearing the device, and a single high-speed camera tracked only the medicine ball. Velocity and power were computed from ball position using video-based analysis. The VBT device showed strong correlations for velocity (r = 0.945, bias = –2.01 ± 1.17 m/s) and force (r = 0.969, bias = –64.16 ± 28.31 N), but power showed a weak correlation (r = 0.150, bias = 277.8 ± 337.1 W) and high variability. …

Go to article

Effect Of Medicine Ball Mass On Trunk Internal Rotation Kinetics During Punch Throw Exercise In Collegiate Baseball Pitchers: A Pilot Study, Shinji Ishikawa, Mizuki Kitamura, Mitsuo Otsuka Nov 2025

Effect Of Medicine Ball Mass On Trunk Internal Rotation Kinetics During Punch Throw Exercise In Collegiate Baseball Pitchers: A Pilot Study, Shinji Ishikawa, Mizuki Kitamura, Mitsuo Otsuka

ISBS Proceedings Archive

The purpose of this pilot study was to clarify the effect of different medicine ball loads on the trunk longitudinal rotational kinetics during the punch throw exercise. Three male right-handed players from a university baseball club participated in this study. The mass of medicine ball used in the experiment trial was set to 1 kg, 3 kg, and 5 kg, which are commonly used in general training. It was found that the peak positive trunk rotation power was higher in the heavier trials and this was not caused by the larger negative trunk internal power. Oppositely, the peak horizontal medicine …

Go to article

Impact Techniques For Controlling Ball Trajectories Height In Soccer Instep Kicking, Koichiro Inoue, Neal Smith, Hiroyuki Nunome Nov 2025

Impact Techniques For Controlling Ball Trajectories Height In Soccer Instep Kicking, Koichiro Inoue, Neal Smith, Hiroyuki Nunome

ISBS Proceedings Archive

The present study aims to illustrate the distinct characteristics of foot motion during ball impact by comparing kicks with different ball launching angles. Seven male soccer players performed 42 trials of soccer instep kicking, targeting two different heights (High and Low). Three cameras recorded the ball impact at 2000 Hz. The ball contact point was near the centre for the low target but approximately 10 mm below it for the high target. While the foot swung downward in both cases, its direction was more horizontal for the high target. A greater abduction tilt was observed for the high target, whereas …

Go to article

Comparison Of Segmental Dynamics Between Soccer Side Volley Kick And Instep Kick, Tsuyoshi Iitake, Hiroyuki Nunome Prof. Nov 2025

Comparison Of Segmental Dynamics Between Soccer Side Volley Kick And Instep Kick, Tsuyoshi Iitake, Hiroyuki Nunome Prof.

ISBS Proceedings Archive

The present study aimed to clarify differences in segmental dynamics between the side-volley kick and the instep kick in soccer. Three-dimensional lower body motion (500 Hz) was captured during both types of kicks of twenty male soccer players. Joint angular velocities, resultant joint torque and interaction torque due to joint reaction forces of the kicking leg were computed using inverse dynamics. Statistical Parametric Mapping was used to compare these time-series changes. Despite the side-volley kick generating significantly smaller hip flexion torque than the instep kick, the hip joint angular velocity of the side-volley kick was comparable to that of the …

Go to article

First Prev Next Last