Journal of Applied Biomechanics最新文献_第2页

Trial-to-Trial Repeatability and Curve-Level Reliability of Rotational-Progress-Aligned Kinematic Waveforms During the Primary 360° Rotation of a Rumba Turning Sequence. 在伦巴旋转序列的主要360°旋转期间，旋转进程对齐的运动学波形的试验到试验的可重复性和曲线级可靠性。

IF 1.6 4区医学

Journal of Applied Biomechanics Pub Date : 2026-08-21 DOI: 10.1123/jab.2026-0127

Mimi Guo, Muhamad Hafiz Bin Ismail, Diyana Zulaika Binti Abdul Ghani, Qi Liang, Yifei Gao

{"title":"Trial-to-Trial Repeatability and Curve-Level Reliability of Rotational-Progress-Aligned Kinematic Waveforms During the Primary 360° Rotation of a Rumba Turning Sequence.","authors":"Mimi Guo, Muhamad Hafiz Bin Ismail, Diyana Zulaika Binti Abdul Ghani, Qi Liang, Yifei Gao","doi":"10.1123/jab.2026-0127","DOIUrl":"https://doi.org/10.1123/jab.2026-0127","url":null,"abstract":"The rumba turning sequence is technically demanding, but the repeatability of continuous kinematic waveforms during repeated performance remains unclear. This study examined trial-to-trial repeatability and curve-level reliability of rotational-progress-aligned kinematic waveforms during the primary 360° rotation in a standardized rumba turning sequence, corresponding to the initial spiral turn. Fifteen high-level adolescent female Latin dancers completed 5 valid trials at 76 beats per minute. Kinematic data were collected using a 10-camera Vicon 3-dimensional motion capture system (100 Hz). Support-foot progression angle, pelvic obliquity, and thorax-pelvis relative frontal-plane angle were analyzed across 101 rotational-progress points. Whole-waveform similarity, point-by-point SD, integrated intraclass correlation coefficient(A,1), integrated standard error of measurement, and key-event reliability were calculated. All variables showed high whole-waveform similarity (r = .932-.944). Integrated intraclass correlation coefficient(A,1) ranged from .545 to .675. Integrated standard error of measurement was smallest for pelvic obliquity (3.98°) and largest for support-foot progression angle (10.55°). Variability hotspots occurred in specific rotational-progress regions, and magnitude-related key events generally showed smaller absolute error than timing-related events. These findings indicate that continuous kinematic variables differ in reliability and measurement error and should be selected cautiously for repeated technical assessment.","PeriodicalId":54883,"journal":{"name":"Journal of Applied Biomechanics","volume":" ","pages":"1-8"},"PeriodicalIF":1.6,"publicationDate":"2026-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148801751","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Low Back Forces During Load Carriage in Asymmetrical Gait. 不对称步态负重时的下背力。

IF 1.6 4区医学

Journal of Applied Biomechanics Pub Date : 2026-08-17 DOI: 10.1123/jab.2025-0254

Jacob J Banks, Katherine A Boyer, Brian R Umberger, Graham E Caldwell

{"title":"Low Back Forces During Load Carriage in Asymmetrical Gait.","authors":"Jacob J Banks, Katherine A Boyer, Brian R Umberger, Graham E Caldwell","doi":"10.1123/jab.2025-0254","DOIUrl":"https://doi.org/10.1123/jab.2025-0254","url":null,"abstract":"Carrying tasks are a part of everyday life for both able-bodied individuals and those with clinical gait asymmetries. While carrying tasks and gait asymmetries have each independently been associated with low back pain, the combination of these factors has received limited attention. We addressed this gap by employing an established experimental protocol to induce gait asymmetries with a clinical walking boot in healthy able-bodied participants (n = 12). Participants carried dumbbells weighing 7.5% and 15% of body weight in 1 or 2 hands. Low back joint and muscle forces estimated from a musculoskeletal model during asymmetric and symmetric gaits were compared. Our results indicated that normalized peak low back forces were mostly not impacted by gait asymmetry except when carrying the higher 15% load alone in the hand contralateral to the walking boot. Raw peak L5/S1 intervertebral joint compression (1291-3551 N) and shear (181-604 N) forces during all carrying tasks were below spinal unit tissue injury tolerances for manual materials handling. Future work should look to examine nonbiomechanical factors, alternative sources or levels of asymmetry, or other daily tasks that could contribute to low back pain in those with gait asymmetries.","PeriodicalId":54883,"journal":{"name":"Journal of Applied Biomechanics","volume":" ","pages":"1-10"},"PeriodicalIF":1.6,"publicationDate":"2026-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148801821","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Prediction of Running Anteroposterior Ground Reaction Force From the Vertical Component Through a Deep Learning Approach. 利用深度学习方法预测垂直分量的前后地面反作用力。

IF 1.6 4区医学

Journal of Applied Biomechanics Pub Date : 2026-08-06 DOI: 10.1123/jab.2025-0313

Remy Roinson, Alexandre Karamanoukian, Jean-Philippe Boucher, Nicolas Vignais

{"title":"Prediction of Running Anteroposterior Ground Reaction Force From the Vertical Component Through a Deep Learning Approach.","authors":"Remy Roinson, Alexandre Karamanoukian, Jean-Philippe Boucher, Nicolas Vignais","doi":"10.1123/jab.2025-0313","DOIUrl":"https://doi.org/10.1123/jab.2025-0313","url":null,"abstract":"Studying ground reaction force (GRF) is essential for in situ running analysis, as they provide critical insights into both performance optimization and the etiology of running-related injuries. However, the use of current measurement systems in ecological or field conditions remains limited: their restricted measurement areas constrain data collection to only a few steps, and their high cost hinders widespread adoption. Recently, a size-adjustable instrumented track has been developed to measure the vertical component of GRF outside the laboratory environment. Building on this advancement, the present study aims to develop a neural network approach for predicting the anteroposterior component from the measured vertical component and to evaluate the impact of prediction errors on joint kinetics. A public data set comprising 9500 running steps was used to train, validate, and test the prediction model. The results demonstrated that a convolutional neural network can accurately predict the anteroposterior component of the GRF (relative root mean square error = 7.44%). While these anteroposterior-GRF prediction errors had only a minor impact on ankle moment calculations, estimates at the knee and hip were more substantially affected. These findings suggest that the proposed model may be effectively applied in conjunction with the size-adjustable instrumented track.","PeriodicalId":54883,"journal":{"name":"Journal of Applied Biomechanics","volume":" ","pages":"1-8"},"PeriodicalIF":1.6,"publicationDate":"2026-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148686714","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Comparison of Biomechanical Variables and Pitching Timing in Professional Baseball Pitchers According to Ball Velocity. 职业棒球投手根据球速度之生物力学变数与投球时机之比较。

IF 1.6 4区医学

Journal of Applied Biomechanics Pub Date : 2026-08-05 DOI: 10.1123/jab.2025-0261

Dong Chul Park, Byong Hun Kim, Joon Haeng Cho, Kiwoong Cho, Sae Yong Lee

{"title":"Comparison of Biomechanical Variables and Pitching Timing in Professional Baseball Pitchers According to Ball Velocity.","authors":"Dong Chul Park, Byong Hun Kim, Joon Haeng Cho, Kiwoong Cho, Sae Yong Lee","doi":"10.1123/jab.2025-0261","DOIUrl":"https://doi.org/10.1123/jab.2025-0261","url":null,"abstract":"This study aimed to identify key kinematic and kinetic factors that affect ball velocity in professional baseball pitchers, focusing on the role of pitching timing. It was hypothesized that pitchers in the high-velocity group (HG) would exhibit delayed timing of key pitching events, as well as greater pelvic and trunk kinematics, and higher ground reaction force (GRF) than those in the low-velocity group (LG). Based on ball velocity, this study categorized 40 professional pitchers registered with the Korea Baseball Organization into HG and LG. A Vicon motion capture system, force plates, and a speed gun were utilized to collect data on body segment motion, joint angular velocity, and GRF. Independent t-tests were conducted to compare differences between the 2 groups. The results revealed that the HG exhibited notably higher trunk angular velocity, drive leg anterior GRF impulse, and stride leg vertical GRF than the LG. Moreover, the HG demonstrated later stride foot contact, maximal external rotation, and ball release, indicating that delayed pitching timing contributes to increased ball velocity. These results highlight the importance of trunk rotation and GRF production for achieving high ball velocity. Furthermore, the timing of key pitching events is considered a distinguishing factor among elite pitchers.","PeriodicalId":54883,"journal":{"name":"Journal of Applied Biomechanics","volume":" ","pages":"1-6"},"PeriodicalIF":1.6,"publicationDate":"2026-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148686719","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Consensus Recommendations for Common Data Elements in Osteoarthritis and Posttraumatic Osteoarthritis Research From the ATOAC: Part II-Biomechanics and Neural Function. 骨关节炎和创伤后骨关节炎研究中常见数据元素的共识建议：第二部分-生物力学和神经功能。

IF 1.6 4区医学

Journal of Applied Biomechanics Pub Date : 2026-07-25 DOI: 10.1123/jab.2025-0130

引用次数: 0

Consensus Recommendations for Common Data Elements in Osteoarthritis and Posttraumatic Osteoarthritis Research From the ATOAC: Part III-Imaging and Biomarkers. 骨关节炎和创伤后骨关节炎研究中常见数据元素的共识建议：第三部分-成像和生物标志物。

IF 1.6 4区医学

Journal of Applied Biomechanics Pub Date : 2026-07-25 DOI: 10.1123/jab.2025-0131

引用次数: 0

Altered Hamstring Mechanics and Strength Deficits Impair Balance Control in Athletes Following Hamstring Strain. 腿筋拉伤后运动员腿筋力学改变和力量缺陷对平衡控制的影响。

IF 1.6 4区医学

Journal of Applied Biomechanics Pub Date : 2026-07-25 DOI: 10.1123/jab.2025-0359

Amornthep Jankaew, Cheng-Feng Lin

{"title":"Altered Hamstring Mechanics and Strength Deficits Impair Balance Control in Athletes Following Hamstring Strain.","authors":"Amornthep Jankaew, Cheng-Feng Lin","doi":"10.1123/jab.2025-0359","DOIUrl":"https://doi.org/10.1123/jab.2025-0359","url":null,"abstract":"Hamstring strains result in alterations to muscle function; however, evidence regarding how these changes affect balance performance remains limited. This study investigated the impact of altered hamstring function on balance control in athletes with hamstring injuries. Thirty-two participants (16 injured hamstrings and 16 controls) participated in this study. Hamstring properties and strength were assessed to evaluate muscle function. Participants performed maximum lean forward in both single- and double-leg stances under eyes-closed and eyes-open conditions on a force platform. Then, the center of pressure was analyzed. Injured athletes exhibited higher hamstring stiffness (P = .028) and decrement (P = .019), and lower strength (P = .024 at 0° and P = .005 at 90°). Also, they displayed a greater sway range in both the anteroposterior (P = .029) and mediolateral directions (P = .030), together with increased center of pressure velocity (P = .019) and a larger sway area (P = .020) during a forward lean task under eye-closed conditions. Significant associations were identified between hamstring function and balance control. These findings indicate that alterations in hamstring function following muscle strains contribute to impaired balance control. This factor should be considered in training and rehabilitation for athletes recovering from hamstring injuries.","PeriodicalId":54883,"journal":{"name":"Journal of Applied Biomechanics","volume":" ","pages":"1-10"},"PeriodicalIF":1.6,"publicationDate":"2026-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148594645","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Influence of Lumbar Spine Passive Stiffness on Spinal Mechanical Stability: Applications of Lumbopelvic Angle Sway. 腰椎被动僵硬对脊柱机械稳定性的影响：腰骨盆角摆动的应用。

IF 1.6 4区医学

Journal of Applied Biomechanics Pub Date : 2026-07-24 DOI: 10.1123/jab.2025-0299

Joshua S M Lowery, Kayla M Fewster

{"title":"The Influence of Lumbar Spine Passive Stiffness on Spinal Mechanical Stability: Applications of Lumbopelvic Angle Sway.","authors":"Joshua S M Lowery, Kayla M Fewster","doi":"10.1123/jab.2025-0299","DOIUrl":"https://doi.org/10.1123/jab.2025-0299","url":null,"abstract":"Lumbar spine passive stiffness (LSPS) has been theorized to be a necessary source of stability for the vertebral column. However, the degree that LSPS plays in maintaining spinal stability has yet to be investigated. Trunk moment of inertia has been linked to LSPS, suggesting that an optimal LSPS value may exist. Determining trunk moment of inertia and LSPS allows the trunk to be modeled as an oscillatory system. Therefore, the current work aimed to determine if LSPS can be applied to infer spinal stability by comparing the predicted natural frequency of the trunk to the mean power frequency of lumbopelvic sway. Twenty participants completed a 5-minute standing trial. The mean power frequency of their lumbopelvic angle sway was quantified using a Fourier transform. The natural frequency of the trunk was estimated using anthropometric measures. A significant relationship was observed between the natural frequency of lumbopelvic angle sway and the natural frequency of the trunk, suggesting that trunk kinematics can be modeled using inputs of LSPS and trunk moment of inertia. Such findings reinforce the importance of LSPS in maintaining the stability of the spine and provide a novel avenue for spinal stability to be investigated.","PeriodicalId":54883,"journal":{"name":"Journal of Applied Biomechanics","volume":" ","pages":"1-5"},"PeriodicalIF":1.6,"publicationDate":"2026-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148594721","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Relationship Between the Patterns of Time-Course Changes in Running Pace and Running Mechanics in a Full Marathon. 全程马拉松跑速时程变化规律与跑步力学的关系

IF 1.6 4区医学

Journal of Applied Biomechanics Pub Date : 2026-07-23 DOI: 10.1123/jab.2025-0042

Nao Hirakawa, Masanori Sakaguchi

{"title":"Relationship Between the Patterns of Time-Course Changes in Running Pace and Running Mechanics in a Full Marathon.","authors":"Nao Hirakawa, Masanori Sakaguchi","doi":"10.1123/jab.2025-0042","DOIUrl":"https://doi.org/10.1123/jab.2025-0042","url":null,"abstract":"In full marathons, a considerable slowdown that typically occurs after 30 km, often referred to as \"hitting the wall,\" is well known, but the underlying biomechanical mechanism remains unclear. This study aimed to elucidate pacing patterns and kinematic changes in marathon runners. Hierarchical clustering of running pace per kilometer of 297 participants, obtained from 58 marathon races, identified 3 groups, each exhibiting different biomechanical changes tracked by wearable sensors. Two groups that experienced a slowdown showed decreases in step length (effect size [ES] = 0.40-1.43), step frequency (ES = 0.30-0.34), and vertical stiffness (ES = 0.55-0.65), along with an increase in contact time (ES = 0.56-0.86). The group that slowed down suddenly after 30 km displayed unchanged vertical oscillation, in contrast to the group that began slowing down earlier. The relationship among contact time, step length, and vertical stiffness observed differs from findings in laboratory tests with constant speed, suggesting that changes in step length in response to decreased vertical stiffness may contribute to the slowdown. The mechanism of sudden slowdown after 30 km, which is unique to marathon running, should be distinguished from slowdowns that occur earlier.","PeriodicalId":54883,"journal":{"name":"Journal of Applied Biomechanics","volume":" ","pages":"1-8"},"PeriodicalIF":1.6,"publicationDate":"2026-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148585890","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Consensus Recommendations for Common Data Elements in Osteoarthritis and Posttraumatic Osteoarthritis Research From the ATOAC: Part I-Physical Activity and Patient-Reported Outcomes. 关于骨关节炎和创伤后骨关节炎研究中常见数据元素的共识建议：第一部分：身体活动和患者报告的结果。

IF 1.6 4区医学

Journal of Applied Biomechanics Pub Date : 2026-07-23 DOI: 10.1123/jab.2025-0129

引用次数: 0