Journal of biomechanics最新文献

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In vivo-driven optimization of finite element models’ parameters for capturing altered mechanics in patients with Achilles tendinopathy 在体内驱动优化的有限元模型参数捕捉改变力学的跟腱病变患者
IF 2.4 3区 医学
Journal of biomechanics Pub Date : 2025-06-17 DOI: 10.1016/j.jbiomech.2025.112824
Alessia Funaro , Vickie Shim , Ine Mylle , Chun Vong , Benedicte Vanwanseele
{"title":"In vivo-driven optimization of finite element models’ parameters for capturing altered mechanics in patients with Achilles tendinopathy","authors":"Alessia Funaro ,&nbsp;Vickie Shim ,&nbsp;Ine Mylle ,&nbsp;Chun Vong ,&nbsp;Benedicte Vanwanseele","doi":"10.1016/j.jbiomech.2025.112824","DOIUrl":"10.1016/j.jbiomech.2025.112824","url":null,"abstract":"<div><div>Patients with Achilles tendinopathy exhibit altered tendon mechanics, including changes in the sliding behaviour of Achilles tendon (AT) subtendons and variations in material properties. These individual mechanical alterations influence the AT’s response to load and the resulting strains, which are critical for understanding the mechanisms underlying Achilles tendinopathy and promoting effective recovery. The goal of this study was to develop an optimization routine to determine 1) patient-specific AT mechanics, representing the altered sliding mechanisms and 2) patient-specific material properties of the AT, thereby offering a more individualized depiction of the tendon’s response under load. Thirteen patients with Achilles tendinopathy were imaged at rest using three-dimensional freehand ultrasound. The images were manually segmented to create finite element models with patient-specific AT shapes, which also incorporated the twisted geometry of the subtendons. The optimization routine was informed by various <em>in vivo</em> experimental data, including AT elongations estimated during sub-maximal voluntary isometric contraction (measured via three-dimensional freehand ultrasound) for material coefficient estimation, as well as localized AT differential displacement (measured via ultrasound speckle tracking) for friction coefficient estimation. Additionally, patient-specific maximal voluntary isometric contraction (MVIC) force estimations were integrated into the model. This optimization process identified patient-specific material and friction coefficients for the finite element models, enabling the closest possible alignment with experimental observations. By incorporating altered tendon properties, such as subtendon sliding and material characteristics, the routine provides a tool for future applications which aim to gain a comprehensive understanding of the individualized AT response to load and offer valuable insights for managing Achilles tendinopathy.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"189 ","pages":"Article 112824"},"PeriodicalIF":2.4,"publicationDate":"2025-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144365355","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Convex wrapping description of biarticular hip muscles for patient-specific musculoskeletal modeling 双关节髋部肌肉的凸包膜描述用于患者特定的肌肉骨骼建模
IF 2.4 3区 医学
Journal of biomechanics Pub Date : 2025-06-17 DOI: 10.1016/j.jbiomech.2025.112802
Yanbing Wang , Jianqiao Guo , Hao Tang , Qiang Tian
{"title":"Convex wrapping description of biarticular hip muscles for patient-specific musculoskeletal modeling","authors":"Yanbing Wang ,&nbsp;Jianqiao Guo ,&nbsp;Hao Tang ,&nbsp;Qiang Tian","doi":"10.1016/j.jbiomech.2025.112802","DOIUrl":"10.1016/j.jbiomech.2025.112802","url":null,"abstract":"<div><div>Determination of hip muscle paths and their moment arms is crucial in subject-specific musculoskeletal modeling. Existing approaches, including via-point, obstacle-set, and others, cannot estimate a smooth path for biarticular muscles such as iliopsoas. This study proposed a modified convex wrapping algorithm based on subject-specific medical imaging to prevent the predicted path from penetrating its underlying bone geometries. Muscle attachment points were automatically personalized using the point cloud registration method. The muscle path was then defined as the shortest path wrapped over the convex hull and searched via Dijkstra’s algorithm. Moreover, a constraint plane for preventing muscle–bone penetration was obtained using the point cloud of the underlying bone. The results of the identified iliopsoas path were compared with the conventional via-point method, revealing that the proposed algorithm can overcome the shortcoming of path non-smoothness via-point paths with certain hip postures. The obtained moment arms were further validated using the magnetic-resonance-imaging-based measurement from the literature, corroborating its applications in musculoskeletal modeling and quantitative surgical planning.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"189 ","pages":"Article 112802"},"PeriodicalIF":2.4,"publicationDate":"2025-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144330762","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Optimization of ergonomic parameters in overhead arc welding using grey relational analysis 基于灰色关联分析的架空弧焊工效参数优化
IF 2.4 3区 医学
Journal of biomechanics Pub Date : 2025-06-17 DOI: 10.1016/j.jbiomech.2025.112823
Md Dilshad Alam , Imtiaz Ali Khan
{"title":"Optimization of ergonomic parameters in overhead arc welding using grey relational analysis","authors":"Md Dilshad Alam ,&nbsp;Imtiaz Ali Khan","doi":"10.1016/j.jbiomech.2025.112823","DOIUrl":"10.1016/j.jbiomech.2025.112823","url":null,"abstract":"<div><div>Overhead arc welding tasks are physically demanding, often leading to work-related musculoskeletal disorders (WMSDs), particularly affecting the upper limb and lower back due to sustained awkward postures, repetitive motion, inadequate workstation design, and prolonged standing. These factors affect the worker’s performance, health, safety, and comfort.</div><div>This study aimed to optimize the shoulder angle, elbow angle, and wrist position to minimize discomfort and shoulder pain, grip force, and task time in overhead arc welding tasks.</div><div>An L27 orthogonal array design was used to evaluate the effects of shoulder angles, elbow angles, and wrist positions on grip force, task time, discomfort rating, and shoulder pain. Grey relational analysis (GRA) identified the optimal factor combination, while ANOVA applied on Grey Relational Grades (GRG) identified the significance of each input factor. To validate the GRA results, TOPSIS was applied, followed by experimental confirmation of responses at the optimal settings.</div><div>The GRA identified shoulder angle (115–125°), elbow angle (30–40°), and neutral wrist position (A<sub>2</sub>B<sub>3</sub>C<sub>2</sub>) as the optimal configuration. ANOVA results revealed that shoulder angle, elbow angle, and wrist position significantly influence grip force, task efficiency, shoulder pain, and discomfort levels.</div><div>This study examines ergonomic factors in overhead arc welding to minimize WMSDs and improve productivity and comfort. It offers insights into the optimal shoulder, elbow, and wrist positions but is limited by a controlled environment and limited-angle ranges. Future research should involve varied participant profiles, explore grip force at different points, capture EMG signals, and evaluate torch movement consistency.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"189 ","pages":"Article 112823"},"PeriodicalIF":2.4,"publicationDate":"2025-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144313276","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Evaluating the influence of trunk intra-muscular and intra-abdominal pressure on spinal geometric compensation 评估躯干肌内和腹内压力对脊柱几何代偿的影响
IF 2.4 3区 医学
Journal of biomechanics Pub Date : 2025-06-17 DOI: 10.1016/j.jbiomech.2025.112822
Adi Mithani , Ahmed Aoude , Mark Driscoll
{"title":"Evaluating the influence of trunk intra-muscular and intra-abdominal pressure on spinal geometric compensation","authors":"Adi Mithani ,&nbsp;Ahmed Aoude ,&nbsp;Mark Driscoll","doi":"10.1016/j.jbiomech.2025.112822","DOIUrl":"10.1016/j.jbiomech.2025.112822","url":null,"abstract":"<div><div>Biomechanical modelling studies have revealed the impact of passive mechanical properties of spinal soft tissues on spinal configuration. This study extends prior work by evaluating the involvement of trunk abdominal and intramuscular pressure (IMP), on spinal geometric compensation, using a validated finite element spine model. The model included the vertebrae, rib cage, IVD, pelvis, ligaments, abdominal cavity and abdominal and spinal muscles. Over a fixed pelvis, the model underwent a 60° forward flexion. Muscles and the abdominal cavity were modelled as fluid-filled solid entities containing hydrostatic pressure elements, enabling IMP and intra-abdominal pressure (IAP) quantification. Changes in lumbar segmental rotations, spine range of motion (RoM) and curvature (thoracic kyphotic (TKA) and lumbar lordotic angle (LLA)) were analyzed following a 1) 10-fold increase and decrease in paraspinal IMP and a 2) 20-fold increase in IAP, relative to the validated model. A 10-fold increase in paraspinal IMP or 20-fold increase in IAP decreased lumbar ROM by a maximum of 8.4° and increased the TKA and LLA by a maximum of 5.8° and 4.7°, respectively during forward flexion. Heightened IAP correlated with decreased paraspinal IMP. Conversely increased paraspinal IMP correlated with IAP reductions. This investigation showed a synergistic interplay between paraspinal IMP and IAP on segmental mobility and spine geometry. The shared influence may suggest a clinical impact of targeting both muscle groups in scenarios involving lower back dysfunction.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"189 ","pages":"Article 112822"},"PeriodicalIF":2.4,"publicationDate":"2025-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144313723","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Does running performance affect the thoracic diameter expansion among different running intensities? 不同跑步强度下的运动表现是否影响胸径扩张?
IF 2.4 3区 医学
Journal of biomechanics Pub Date : 2025-06-13 DOI: 10.1016/j.jbiomech.2025.112820
Gonzalo Garrido-López , Javier Rueda , Alejandro F. San Juan , Markus Bastir , Benoit Beyer , Enrique Navarro
{"title":"Does running performance affect the thoracic diameter expansion among different running intensities?","authors":"Gonzalo Garrido-López ,&nbsp;Javier Rueda ,&nbsp;Alejandro F. San Juan ,&nbsp;Markus Bastir ,&nbsp;Benoit Beyer ,&nbsp;Enrique Navarro","doi":"10.1016/j.jbiomech.2025.112820","DOIUrl":"10.1016/j.jbiomech.2025.112820","url":null,"abstract":"<div><div>Traditionally, breathing expansion has been considered solely as a physiological process, neglecting the biomechanical aspects. This expansion does not appear to occur uniformly across the upper and lower levels of the ribcage. Moreover, running performance seems to be a determining factor for the thoracic wall movements. This study aims to analyse how mediolateral and anteroposterior thoracic diameters vary at different levels (upper, middle, and lower) in athletes with different running performance levels at various running intensities. Twenty-two healthy athletes were recorded using optoelectronic plethysmography while performing an incremental running test. Three recordings were taken from each subject at different running intensities, and three running performance groups were created by the final velocity obtained in the incremental test. An increase in the thoracic expansion of anteroposterior and mediolateral diameters at all levels was observed while the exercise intensity rose. However, a mirrored pattern was found while the intensity rose: the upper anteroposterior and lower mediolateral diameters appear to expand more during the initial phase of the effort, whereas the upper mediolateral and lower anteroposterior diameters expand more during the final phase of the effort. No significant differences were found between running performance groups at the same exercise intensity, although the mirrored pattern was slightly seen when analysing each group separately. Bigger differences among running performance groups are needed to glimpse thoracic kinematics variances. Further research on thoracic kinematics is required to understand better respiratory disorders, fitness assessments, and respiratory diseases.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"189 ","pages":"Article 112820"},"PeriodicalIF":2.4,"publicationDate":"2025-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144313274","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
In-vivo biomechanical characteristics analysis of ascending aortic aneurysm using multidimensional dynamic CTA 升主动脉瘤体内生物力学特征的多维动态CTA分析
IF 2.4 3区 医学
Journal of biomechanics Pub Date : 2025-06-13 DOI: 10.1016/j.jbiomech.2025.112819
Cheng-Wei Yang , Lan Cao , Tianming Huang , Wei-Guo Ma , Weiwei Qi , Li-Zhong Sun , Lian-Jun Huang , Yuanming Luo
{"title":"In-vivo biomechanical characteristics analysis of ascending aortic aneurysm using multidimensional dynamic CTA","authors":"Cheng-Wei Yang ,&nbsp;Lan Cao ,&nbsp;Tianming Huang ,&nbsp;Wei-Guo Ma ,&nbsp;Weiwei Qi ,&nbsp;Li-Zhong Sun ,&nbsp;Lian-Jun Huang ,&nbsp;Yuanming Luo","doi":"10.1016/j.jbiomech.2025.112819","DOIUrl":"10.1016/j.jbiomech.2025.112819","url":null,"abstract":"<div><div>This study utilized multidimensional dynamic computed tomography angiography (MD-CTA) to analyze the biomechanical characteristics of ascending thoracic aortic aneurysms (ATAA) in 30 subjects: 20 ATAA patients (12 with Marfan syndrome and 8 without) and 10 healthy individuals without ascending aortic disease. Aortic models were reconstructed from CTA images, and multi-phase displacement data were obtained via image registration. The inverse finite element method (iFEM) was applied to calculate wall tension, and displacement data was used to calculate wall strain, from which strain–tension curves were fitted. Based on these curves, we calculated the previously proposed mechanical parameters <em>SSI</em> and <em>dSSI</em> to assess wall mechanics. Given the considerable deformation of the ascending aorta, two additional parameters—potential energy reserve index (<em>PERI</em>) and strain resistance (<em>Rs</em>)—were used to evaluate energy storage. Mann–Whitney U tests revealed that both <em>SSI</em> and <em>dSSI</em> were significantly higher in the non-Marfan ATAA group compared to the Marfan and control groups, but showed no significant difference between the latter two groups. <em>PERI</em> and <em>Rs</em> were higher in the non-Marfan group compared to two other groups, reaching significance only between the non-Marfan and control groups, while the Marfan and control groups showed no significance. With further validation, these in vivo biomechanical markers may be used as complementary metrics for assessing patient-specific risk of aneurysm rupture.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"189 ","pages":"Article 112819"},"PeriodicalIF":2.4,"publicationDate":"2025-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144313234","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
In vivo measurement of vertebral deformation using digital tomosynthesis based digital volume correlation 基于数字体积相关的数字断层合成在体内测量椎体变形
IF 2.4 3区 医学
Journal of biomechanics Pub Date : 2025-06-13 DOI: 10.1016/j.jbiomech.2025.112815
Daniel Oravec , Roger Zauel , Michael J. Flynn , Sudhaker Rao , Yener N. Yeni
{"title":"In vivo measurement of vertebral deformation using digital tomosynthesis based digital volume correlation","authors":"Daniel Oravec ,&nbsp;Roger Zauel ,&nbsp;Michael J. Flynn ,&nbsp;Sudhaker Rao ,&nbsp;Yener N. Yeni","doi":"10.1016/j.jbiomech.2025.112815","DOIUrl":"10.1016/j.jbiomech.2025.112815","url":null,"abstract":"<div><div>Vertebral fractures are the most common type of osteoporotic fracture and associated with significant complications. Timely intervention is important to prevent vertebral fractures, however the current standard for assessing osteoporosis (bone mineral density) is not fully accurate for identifying at-risk individuals. Inspired by a laboratory technique combining microcomputed tomography with mechanical loading for mechanical assessment of extracted bone structures, digital tomosynthesis-based digital volume correlation (DTS-DVC) uses supine and standing DTS images of patients in combination with DVC. The current study evaluated <em>in vivo</em> precision errors, and the utility of DTS-DVC in identifying mechanically compromised vertebrae. Seven patients with vertebral fracture (Fx) and twelve without (NFx) were DTS-imaged, and endplate-to-endplate displacement, stiffness, compliance, and endplate distribution statistics were calculated using supine reference images and images acquired in supine, standing, standing while holding added weight. The <em>in vivo</em> measurement error of DTS-DVC metrics and the extent to which DTS-DVC can measure differences in vertebrae due to loading and presence of vertebral deformity (vertebral fracture) were examined. Total measurement error was low (0.017–0.019 mm), and all measured parameters changed with loading (p &lt; 0.0001 to p &lt; 0.05). Endplate-to-endplate displacement and displacement heterogeneity were significantly higher in fractured vs adjacent intact vertebrae. There were large differences in DVC variables between intact L1 vertebrae of Fx and NFx groups; however, these were not statistically demonstrable. Collectively, results support the <em>in vivo</em> feasibility of DTS-DVC and warrant further investigation. A biomechanics-based assessment of vertebral bone quality is expected to improve our understanding and clinical assessment of vertebral fracture risk.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"189 ","pages":"Article 112815"},"PeriodicalIF":2.4,"publicationDate":"2025-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144313277","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Changes in mechanical work during treadmill-induced asymmetric walking 在跑步机引起的不对称行走中机械功的变化
IF 2.4 3区 医学
Journal of biomechanics Pub Date : 2025-06-12 DOI: 10.1016/j.jbiomech.2025.112818
Samantha K. Price , Jill S. Higginson , Nadia R. Khoury , Karin Gravare Silbernagel , Patrick Corrigan
{"title":"Changes in mechanical work during treadmill-induced asymmetric walking","authors":"Samantha K. Price ,&nbsp;Jill S. Higginson ,&nbsp;Nadia R. Khoury ,&nbsp;Karin Gravare Silbernagel ,&nbsp;Patrick Corrigan","doi":"10.1016/j.jbiomech.2025.112818","DOIUrl":"10.1016/j.jbiomech.2025.112818","url":null,"abstract":"<div><div>Asymmetric walking patterns are common in healthy and clinical populations. While minor asymmetries are likely benign, greater asymmetries may negatively affect physical function and mobility. Changes in mechanical work may largely explain why walking asymmetry influences physical function and mobility. Thus, the purpose of this study was to describe how increasing the degree of walking asymmetry affects limb- and joint-level mechanical work. Ten healthy participants walked on a force-instrumented split-belt treadmill for a total of 33 min. Participants began by walking for 6 min at 1.2 m/s with both treadmill belts moving at equal speeds (0 % condition). After the 0 % condition, the speed of the right belt was reduced by 10, 25, and 50 % while the left belt maintained a constant speed of 1.2 m/s. To visualize the distribution of work within each limb, pie charts were developed by calculating the relative work performed by each joint/segment to the total absolute limb work. To determine the effect of walking asymmetry on mechanical cost of transport (CoT), we constructed a 2x4 (limb-by-condition) repeated measures ANOVA model. There was a significant limb-by-condition interaction (p &lt; 0.0001), with CoT decreasing in the fast limb and increasing in the slow limb as asymmetry increased. However, the joint-level distribution of work remained relatively unchanged across walking conditions. Therefore, inducing asymmetric walking in healthy adults appears to alter mechanical costs while only minimally affecting joint/segment-level compensations. Future research should focus on individuals with pathologies to determine if similar strategies are observed.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"189 ","pages":"Article 112818"},"PeriodicalIF":2.4,"publicationDate":"2025-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144321839","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Performance analysis of instrumented socks compared to instrumented treadmill for gait measurements in healthy adults 健康成人步态测量中带器械的袜子与带器械的跑步机的性能分析
IF 2.4 3区 医学
Journal of biomechanics Pub Date : 2025-06-11 DOI: 10.1016/j.jbiomech.2025.112813
T. Sarathi , B.K. Dinakar Rai , K.K. Venkataraman , Amitava Bhattacharyya
{"title":"Performance analysis of instrumented socks compared to instrumented treadmill for gait measurements in healthy adults","authors":"T. Sarathi ,&nbsp;B.K. Dinakar Rai ,&nbsp;K.K. Venkataraman ,&nbsp;Amitava Bhattacharyya","doi":"10.1016/j.jbiomech.2025.112813","DOIUrl":"10.1016/j.jbiomech.2025.112813","url":null,"abstract":"<div><div>Traditional gait analysis devices, such as force plates or Instrumented Treadmills (I-TM), often require laboratory settings and can be costly and restrictive, containing their applicability outside controlled environments. To overcome these limitations, we developed the Instrumented Socks Wireless Data Acquisition Module (IS-WDAQ). The accuracy of our developed IS-WDAQ was examined by calculating important temporal parameters (TPs) like step time, stance time, cadence, stance percentage, and swing percentage and compared with I-TM equipment. Participants (n = 250) were divided into groups depending on their age and Body Mass Index (BMI). Categorizing groups by BMI helps to evaluate both systems and ensures accurate, consistent measurements across body types. The Mean Bias Error (MBE) analysis was performed for the two different systems based on their generated TPs. Cadence had the lowest MBE (less than 2 %) among the three conditions tested: Normal (Group N), Overweight (Group OV), and Obese (Group OB). MBE was highest in step time (−5.32 to 7.29 %) and stride time (−9.35 to 4.55 %). For the three BMI groups, stance and swing percentage inaccuracies ranged from −0.78 to 5.18 %. The Intraclass Correlation Coefficient (ICC) showed a very strong cadence association (&gt;0.9) for the three BMI categories across five age groups, while stance and swing percentages were also strongly correlated. The Bland-Altman plot spreads are also within acceptable limits. The study findings imply that the IS-WDAQ is a viable alternative to I-TM for calculating numerous TPs, including cadence, step time, stride time, stance, and swing percentages, especially for use outside laboratory settings.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"189 ","pages":"Article 112813"},"PeriodicalIF":2.4,"publicationDate":"2025-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144298573","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Effect of hand support during squats on tibiofemoral and patellofemoral joint forces 深蹲时手部支撑对胫股和髌股关节力量的影响
IF 2.4 3区 医学
Journal of biomechanics Pub Date : 2025-06-11 DOI: 10.1016/j.jbiomech.2025.112814
Yasufumi Takeshita , Ryoji Kiyama , Masayuki Kawada , Yuki Nakai , Takasuke Miyazaki , Sota Araki , Shobu Nakashima , Masafumi Fukuda , Daichi Shimose , Rikuto Suzuki , Tomohisa Nishikawa
{"title":"Effect of hand support during squats on tibiofemoral and patellofemoral joint forces","authors":"Yasufumi Takeshita ,&nbsp;Ryoji Kiyama ,&nbsp;Masayuki Kawada ,&nbsp;Yuki Nakai ,&nbsp;Takasuke Miyazaki ,&nbsp;Sota Araki ,&nbsp;Shobu Nakashima ,&nbsp;Masafumi Fukuda ,&nbsp;Daichi Shimose ,&nbsp;Rikuto Suzuki ,&nbsp;Tomohisa Nishikawa","doi":"10.1016/j.jbiomech.2025.112814","DOIUrl":"10.1016/j.jbiomech.2025.112814","url":null,"abstract":"<div><div>Squats are an excellent home exercise but have the disadvantage of high joint forces. Squat-in-home exercises are performed with support and may help reduce joint loading. However, the extent to which knee joint loading is reduced remains unclear. This study aimed to compare joint and muscle forces during normal squats and squats with support. Ten healthy young males performed normal squats and squats with support by the right hand. The hand support and ground reaction forces of both the lower limbs were measured using force plates. The tibiofemoral and patellofemoral joint forces and muscle force of the lower extremities were estimated using a musculoskeletal model simulation based on motion capture data. The joint and muscle forces were normalised to the body weight (% BW) of each participant. The variables of normal squats and squats with support were tested using repeated-measures analysis of variance or the Friedman test. The hand support force in squats with support was 12 ± 5 % BW. By using a support, right tibiofemoral joint force was significantly reduced from 321 ± 38 % BW to 278 ± 42 % BW (p = 0.032) and right patellofemoral joint force decreased from 427 ± 46 % BW to 356 ± 61 % BW (p = 0.008). The right muscle forces in the vastus medialis, biceps femoris, and gluteus maximus decreased, whereas those in the rectus femoris increased. These findings suggest that squats with hand support can reduce joint force, offering safer exercise instruction for rehabilitation, particularly in telerehabilitation and home exercise settings.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"189 ","pages":"Article 112814"},"PeriodicalIF":2.4,"publicationDate":"2025-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144306771","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
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