Journal of biomechanics最新文献

Validity and reliability of a novel device to evaluate balance and postural control − Quadrotics Poise Q10 一种评估平衡和姿势控制的新设备的有效性和可靠性- Quadrotics Poise Q10

IF 2.4 3区医学

Journal of biomechanics Pub Date : 2025-07-16 DOI: 10.1016/j.jbiomech.2025.112871

Gözde Yağcı , Gülnihal Metin , Sibel Yerli , Ali İmran Yalçın , Songül Aksoy , Semra Topuz , Fatih Erbahçeci

{"title":"Validity and reliability of a novel device to evaluate balance and postural control − Quadrotics Poise Q10","authors":"Gözde Yağcı , Gülnihal Metin , Sibel Yerli , Ali İmran Yalçın , Songül Aksoy , Semra Topuz , Fatih Erbahçeci","doi":"10.1016/j.jbiomech.2025.112871","DOIUrl":"10.1016/j.jbiomech.2025.112871","url":null,"abstract":"<div><div>Assessment of balance using force platform-based methods are crucial for diagnosis and treatment in the fields of physiotherapy. This study evaluated the validity and reliability of the Quadrotics Poise Q10 in measuring postural sway and limits of stability, using simultaneous assessments with the Bertec force platform in 40 healthy participants. Postural sway was evaluated under four conditions. Limits of stability were analysed in the four directions. Pearson’s correlation analysis was used to assess the concurrent and absolute validity of the Quadrotics Poise Q10. Intra and Inter-Rater reliability were examined using intraclass correlation coefficients (ICC), standard error of measurement, and Minimum Detectable Change. Additionally Limits of Agreement and Bland–Altman plots were conducted. A strong relationship was observed in anteroposterior and mediolateral sway on both hard and soft surfaces, with eyes open and closed (p < 0.05). Moderate to strong correlations were found for all directions excursions during the limits of stability test (p < 0.05). Intra-rater reliability analysis demonstrated high reliability for postural sway (ICC:0.60–0.87) and excellent reliability for LoS (ICC:0.91–0.95). Inter-rater reliability was found to be high across all test conditions, with ICC values ranging from 0.67 to 0.83 for postural sway and excellent reliability for LoS in the right and left directions (ICC = 0.93 and 0.91, respectively) and high in the forward and backward direcions (ICC = 0.67–0.71). The study’s findings indicate that the newly developed device is valid and reliable for evaluating limits of stability and postural sway. However, Bland–Altman analysis variations highlighted in lower agreement under more challenging test conditions.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"190 ","pages":"Article 112871"},"PeriodicalIF":2.4,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144653480","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

Effects of exercise intensity on shear modulus in regional lateral abdominal muscles during the abdominal draw-in maneuver 运动强度对腹部收缩运动中局部侧腹肌剪切模量的影响

IF 2.4 3区医学

Journal of biomechanics Pub Date : 2025-07-12 DOI: 10.1016/j.jbiomech.2025.112867

Kazuyoshi Kozawa , Gakuto Nakao , Ginji Nara , Risa Adachi , Koki Ishiyama , Keita Sekiguchi , Tsuyoshi Morito , Koji Kaneoka , Keigo Taniguchi

{"title":"Effects of exercise intensity on shear modulus in regional lateral abdominal muscles during the abdominal draw-in maneuver","authors":"Kazuyoshi Kozawa , Gakuto Nakao , Ginji Nara , Risa Adachi , Koki Ishiyama , Keita Sekiguchi , Tsuyoshi Morito , Koji Kaneoka , Keigo Taniguchi","doi":"10.1016/j.jbiomech.2025.112867","DOIUrl":"10.1016/j.jbiomech.2025.112867","url":null,"abstract":"<div><div>The abdominal draw-in maneuver (ADIM) is designed to enhance neuromuscular function of the transversus abdominis (TrA) by distinguishing its activation from the internal oblique (IO) and external oblique (EO). However, a standardized implementation method has not yet been established, and previous studies have not quantitatively defined ADIM exercise intensity or examined regional muscle activation patterns. The lateral abdominal muscles have multiple anatomical attachment sites, suggesting region-specific functional differences. Therefore, identifying the optimal exercise intensity for ADIM requires a regional approach. This study investigated the effects of exercise intensity—defined as a length change in abdominal circumference—on the shear modulus in different regions of the lateral abdominal muscles. Twenty healthy young male participants were included in this study. Five exercise intensity levels (0 %, 25 %, 50 %, 75 %, and 100 %) were established based on the change in length between the abdominal circumference at resting expiration (0 %) and during ADIM retraction of the abdomen with maximum effort (100 %). The shear modulus of the TrA, IO, and EO were measured using shear wave elastography (TrA: upper, middle, lower; IO: middle, lower; EO: upper, middle). The shear modulus of the upper, middle, and lower TrA and lower IO increased progressively from 25 % to 100 % (p < 0.05). The middle IO and upper and middle EO increased from 75 % to 100 % (p < 0.05), but not from 0 % to 50 %. This finding suggested that the optimal ADIM exercise intensity is between 25 % and 50 % when the TrA and lower IO are selectively activated.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"190 ","pages":"Article 112867"},"PeriodicalIF":2.4,"publicationDate":"2025-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144653481","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

Quantitative MRI-measured composition changes despite small mechanical measures in tibiofemoral cartilage of healthy adults under applied load 定量mri测量了健康成人在施加载荷下胫股软骨的组成变化，尽管有小的机械测量

IF 2.4 3区医学

Journal of biomechanics Pub Date : 2025-07-12 DOI: 10.1016/j.jbiomech.2025.112864

Marit E. Scott , Bruce D. Beynnon , Andrew S. Borah , John C. Ramsdell , Mickey I. Krug , Mack G. Gardner-Morse , Michael J. DeSarno , Jiming Zhang , Matthew Geeslin , Mathew J. Failla , Timothy W. Tourville , Niccolo M. Fiorentino

{"title":"Quantitative MRI-measured composition changes despite small mechanical measures in tibiofemoral cartilage of healthy adults under applied load","authors":"Marit E. Scott , Bruce D. Beynnon , Andrew S. Borah , John C. Ramsdell , Mickey I. Krug , Mack G. Gardner-Morse , Michael J. DeSarno , Jiming Zhang , Matthew Geeslin , Mathew J. Failla , Timothy W. Tourville , Niccolo M. Fiorentino","doi":"10.1016/j.jbiomech.2025.112864","DOIUrl":"10.1016/j.jbiomech.2025.112864","url":null,"abstract":"<div><div>A crucial step in understanding the onset and progression of cartilaginous disease, such as osteoarthritis, is to study how cartilage mechanics and composition relate in response to controlled loading in disease-free joints. Both knees of 10 healthy participants were imaged with a 3 T magnetic resonance imaging (MRI) scanner at two timepoints (7 ± 3 days apart). Quantitative MR images for T1ρ and T2* were acquired with the knee in two states: <em>i)</em> a traditional setup without load applied, and <em>ii)</em> while a loading device applied a 40% bodyweight load to the plantar aspect of the foot. Associations between mechanical metrics (cartilage deformation, cartilage strain, change in bone-bone distance, and change in cartilage contact area) and compositional metrics (T1ρ and T2* relaxation times) were identified. Significant decreases in bone-bone distance were seen in all compartments in response to load. Articular cartilage thickness consistently decreased, but differences were significant for only half of the medial and lateral compartments in the tibia and femur. Strains ranged from 4.9% in compression to 0.3% in tension. No significant changes were found in cartilage contact area. T1ρ and T2* relaxation times changed significantly with the application of load, with the femoral and tibial cartilage exhibiting opposite responses. No significant associations were observed between mechanical and compositional metrics for T1ρ scans, but T2* scans had three significant relationships. Results from this work demonstrate that loading can induce tibiofemoral articular cartilage composition changes, as assessed with T1ρ and T2*, even with small magnitude measurements of mechanics.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"190 ","pages":"Article 112864"},"PeriodicalIF":2.4,"publicationDate":"2025-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144653483","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

Modeling and prediction of body segment inertial properties of sheep from tomographic imaging 羊体段惯性特性的层析成像建模与预测

IF 2.4 3区医学

Journal of biomechanics Pub Date : 2025-07-11 DOI: 10.1016/j.jbiomech.2025.112848

Aaron Henry , Carson Benner , Bailee CoVan , Annabelle Helin , Dana Gaddy , Larry J. Suva , Andrew B. Robbins

{"title":"Modeling and prediction of body segment inertial properties of sheep from tomographic imaging","authors":"Aaron Henry , Carson Benner , Bailee CoVan , Annabelle Helin , Dana Gaddy , Larry J. Suva , Andrew B. Robbins","doi":"10.1016/j.jbiomech.2025.112848","DOIUrl":"10.1016/j.jbiomech.2025.112848","url":null,"abstract":"<div><div>Sheep are frequently used animal models of musculoskeletal diseases and orthopedic procedures due to their docility, size and body weight, and similar joint biomechanics to humans. Estimation of body segment inertial properties (BSIPs) is a crucial step in development of biomechanical models, but few resources exist for BSIPs in sheep. The goal of this study was to develop predictive models to estimate the mass, center of mass, and inertia tensor of the hindlimbs of sheep from easily obtainable morphometric data. In addition, this study presents a more comprehensive and repeatable method for defining each hindlimb body segment when directly calculating BSIPs from tomographic imaging. Briefly, CT scans from 16 sheep of varying age, weight, sex, and phenotype were used to calculate BSIPs for the pelvis, thigh, crus, metatarsus, and pastern segments. Those measurements were then used to develop predictive models to estimate the BSIPs for those segments. The predictive models developed showed similar prediction errors to models developed in human populations.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"190 ","pages":"Article 112848"},"PeriodicalIF":2.4,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144653482","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

Spatiotemporal and kinematic parameters during uphill, downhill, and overground walking in forward head posture: a preliminary study 头部前倾上坡、下坡和地上行走的时空和运动学参数：初步研究

IF 2.4 3区医学

Journal of biomechanics Pub Date : 2025-07-11 DOI: 10.1016/j.jbiomech.2025.112866

Seong Ho Yun , Young Min Lee , Jung Won Kwon

{"title":"Spatiotemporal and kinematic parameters during uphill, downhill, and overground walking in forward head posture: a preliminary study","authors":"Seong Ho Yun , Young Min Lee , Jung Won Kwon","doi":"10.1016/j.jbiomech.2025.112866","DOIUrl":"10.1016/j.jbiomech.2025.112866","url":null,"abstract":"<div><div>Forward head posture (FHP) induces forward shifts in the center of gravity (COG), affecting postural control and gait ability. Uphill and downhill walking require different postural control and gait strategies than overground walking due to the altered gravitational effect. The biomechanical characteristics of uphill and downhill walking in healthy adults have been demonstrated; however, those in individuals with FHP remain unclear. This study aimed to investigate COG, spatiotemporal, and kinematic parameters during uphill and downhill walking in individuals with FHP. This study included 10 individuals with FHP (FHP group) and 10 healthy adults (control group). All participants performed three experimental sessions: uphill, downhill, and overground walking. Spatiotemporal and kinematic parameters were measured using a motion analysis system. Results showed significant differences in COG parameters between groups in all sessions (p < 0.05), while no significant differences were found in spatiotemporal parameters (p > 0.05). In the uphill walking session, the mean and peak of head and knee joints during the stance phase in the FHP group were significantly greater than in the control group (p < 0.05). The FHP group showed a significantly greater mean of the knee joint during the stance phase than the control group in downhill and overground walking sessions (p < 0.05). Our results indicate that individuals with FHP have different gait mechanisms during uphill, downhill, and overground walking due to forward-shifted head COG relative to the body. These findings provide the biomechanical mechanisms related to uphill and downhill walking in individuals with FHP.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"190 ","pages":"Article 112866"},"PeriodicalIF":2.4,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144665879","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

Footstrike evaluation in male runners: A comparison of lateral and medial video views against traditional motion capture 男性跑步者的步法评估：与传统动作捕捉相比，横向和内侧视频视图的比较

IF 2.4 3区医学

Journal of biomechanics Pub Date : 2025-07-11 DOI: 10.1016/j.jbiomech.2025.112865

Shiwei Mo , Adrian Siu Yin Chu , Sikun Shao , Yinjie Chen , Kim Hebert-Losier , Li Li , Roy T.H. Cheung

{"title":"Footstrike evaluation in male runners: A comparison of lateral and medial video views against traditional motion capture","authors":"Shiwei Mo , Adrian Siu Yin Chu , Sikun Shao , Yinjie Chen , Kim Hebert-Losier , Li Li , Roy T.H. Cheung","doi":"10.1016/j.jbiomech.2025.112865","DOIUrl":"10.1016/j.jbiomech.2025.112865","url":null,"abstract":"<div><div>Footstrike evaluation is essential for understanding running biomechanics and is often performed in research and clinical settings using 2D video analysis. However, whether it is appropriate to analyse both right-left footstrike patterns from a single sagittal plane video is unclear. This study compared medial and lateral video views in assessing footstrike pattern and footstrike angle, using a motion capture system as the gold standard. We analyzed 4,800 footfalls from 20 healthy recreational runners during self-paced treadmill running, recruited through convenient sampling. Footstrike angle agreement was evaluated using Bland-Altman analysis, intraclass correlation coefficients (ICC), and root mean square error (RMSE). The mean difference in footstrike angle between the gold standard and lateral view was 0.40° (95% limits of agreement: 6.05° to −5.25°), while the medial view showed a mean difference of −1.31° (95% limits: 8.37° to −10.99°). ICC values indicated excellent agreement for both lateral (0.979) and medial (0.940) views to the gold standard. RMSE was lower for the lateral (2.91°) than medial (5.11°) view, suggesting greater precision. Footstrike pattern classification was assessed using Cohen’s kappa, revealing substantial agreement for the lateral view (κ = 0.785, p < 0.001) and good agreement for the medial view (κ = 0.606, p < 0.001). These results indicate that while both views demonstrate strong agreement, the lateral view aligns more closely with the gold standard in continuous and categorical assessments. Our findings suggest lateral video analysis may be preferable for footstrike evaluation in applied and clinical settings.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"190 ","pages":"Article 112865"},"PeriodicalIF":2.4,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144631892","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

A model for solute transport across the arteriole wall 溶质通过小动脉壁的运输模型

IF 2.4 3区医学

Journal of biomechanics Pub Date : 2025-07-08 DOI: 10.1016/j.jbiomech.2025.112853

Mahmood Farooq, Mohamed T. Nur, Bingmei M. Fu

{"title":"A model for solute transport across the arteriole wall","authors":"Mahmood Farooq, Mohamed T. Nur, Bingmei M. Fu","doi":"10.1016/j.jbiomech.2025.112853","DOIUrl":"10.1016/j.jbiomech.2025.112853","url":null,"abstract":"<div><div>Previous models for the transport across the arterial wall investigated the accumulation of macromolecule LDL (diameter > 22 nm) in the arterial structure through a leaky endothelial layer for the formation of atherosclerosis. The current study developed a transport model for smaller solutes (diameter of ∼ 7 nm or less) across an intact arteriole wall to elucidate how the structural components in the wall regulate the solute permeability of the arteriole wall. The structural components include endothelial surface glycocalyx and tight junctions between adjacent endothelial cells, the narrow layer of intima filled with the extracellular matrix (ECM), and the internal elastic lamina (IEL) with fenestral pores. The model incorporates the detailed arteriole wall structure and effective solute diffusion coefficients in different wall regions from the literature. The model predictions match well with the measured permeability of the porcine coronary arteriole to α-lactalbumin (diameter of ∼ 4 nm) and albumin (diameter of ∼ 7 nm). The predictions from the transport model for the arteriole wall also indicate that 1) the intima and IEL of the arteriole wall play a significant role in the modulation of arteriole wall permeability and 2) unlike in the capillary or post-capillary venule, whose wall is formed only by endothelial cells with some pericytes, endothelial surface glycocalyx is not the molecular sieve of the arteriole wall for macromolecules under physiological conditions. Furthermore, the simplified 1D model can be easily applied to predict the structural changes for the modified solute permeability in diseases.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"190 ","pages":"Article 112853"},"PeriodicalIF":2.4,"publicationDate":"2025-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144597293","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

Individual muscle contributions to lower-limb joint quasi-stiffness during steady-state healthy walking 个体肌肉对稳定健康行走期间下肢关节准僵硬的贡献

IF 2.4 3区医学

Journal of biomechanics Pub Date : 2025-07-07 DOI: 10.1016/j.jbiomech.2025.112851

Stephanie L. Molitor, Richard R. Neptune

{"title":"Individual muscle contributions to lower-limb joint quasi-stiffness during steady-state healthy walking","authors":"Stephanie L. Molitor, Richard R. Neptune","doi":"10.1016/j.jbiomech.2025.112851","DOIUrl":"10.1016/j.jbiomech.2025.112851","url":null,"abstract":"<div><div>Maintaining appropriate lower-limb joint stiffness is critical for walking performance, as it facilitates tasks such as absorbing impact loading, maintaining balance, and providing body support and propulsion. Quasi-stiffness, an indirect measure describing the joint moment–angle relationship, is often used to assess joint stiffness during walking as it accounts for passive soft tissue stiffness and active muscle force generation. Thus, identifying the primary muscle contributors to joint moments and angles can elucidate how muscles are coordinated to maintain quasi-stiffness. However, determining individual muscle contributions experimentally is challenging. Therefore, the objective of this study was to use musculoskeletal modeling and simulation to identify individual muscle contributions to sagittal-plane quasi-stiffness during walking. Simulations of 15 healthy young adults were developed and individual muscle contributions to joint moments and angles were determined within discrete phases of the gait cycle. As expected, contributors to ankle, knee and hip moments were the primary dorsiflexors/plantarflexors, knee flexors/extensors, and hip flexors/extensors, respectively, as these muscles cross the joint and directly contribute to their respective joint moments. However, major contributors to the joint angles also included distant and contralateral muscles. Specifically, the hip extensors and ankle dorsiflexors were found to contribute to the knee angle (8.4–19.7% and 9.0–17.1% of total muscle contributions, respectively), while contralateral hip extensors were found to contribute (16.6–27.2%) to the hip angle. These results highlight the role of distant muscles in maintaining quasi-stiffness, and provide a foundation for developing rehabilitation strategies and assistive devices to target stiffness impairments in clinical populations.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"190 ","pages":"Article 112851"},"PeriodicalIF":2.4,"publicationDate":"2025-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144613951","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

A study of in-shoe plantar pressure distribution while firefighters carrying self-contained breathing apparatus in walking and running 消防员携带自给式呼吸器行走和跑步时鞋内足底压力分布的研究

IF 2.4 3区医学

Journal of biomechanics Pub Date : 2025-07-07 DOI: 10.1016/j.jbiomech.2025.112852

Bing Xie, Junxia Zhang

{"title":"A study of in-shoe plantar pressure distribution while firefighters carrying self-contained breathing apparatus in walking and running","authors":"Bing Xie, Junxia Zhang","doi":"10.1016/j.jbiomech.2025.112852","DOIUrl":"10.1016/j.jbiomech.2025.112852","url":null,"abstract":"<div><div>Walking and running with self-contained breathing apparatus (SCBA) are the most common activities among firefighters, but the effect of SCBA carriage on the plantar pressure distribution remains unclear. The purpose of this study is to analyze plantar pressure distribution while carrying SCBA during walking and running.</div><div>Thirty volunteer firefighters participated in the walking and running tasks with no SCBA equipped and SCBA carrying conditions. Data of plantar pressure parameters, including peak pressures and pressure–time integrals, were recorded by Pedar-X in-shoe system in participants’ walking and running processes. Also, the pressures in each region during gait cycle were analyzed. Statistical analyses were performed using repeated measures analysis of variance (p < 0.05).</div><div>Peak pressures in all regions except for the great toe and medial metatarsal regions were higher in the SCBA carrying condition than in the no SCBA equipped condition. Running with SCBA reduced peak pressures in the midfoot region, while increasing peak pressures and pressure–time integrals in the toe, metatarsal, and heel regions compared to walking with SCBA. In addition, compared to the no SCBA equipped, the maximum peak pressure shifted from the great toes to the lateral toes in the toe region, from the medial metatarsal to the lateral metatarsal in the metatarsal region, and from the lateral arch to the medial arch in the midfoot region when carrying SCBA. The results provide an initial baseline for the development of firefighting boots aiming to increase comfort and performance during activities.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"190 ","pages":"Article 112852"},"PeriodicalIF":2.4,"publicationDate":"2025-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144579919","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

Individuals with chronic low back pain have reduced myofascial force transmission between latissimus dorsi and contralateral gluteus maximus muscles 慢性腰痛患者背阔肌和对侧臀大肌之间的肌筋膜力传递减少

IF 2.4 3区医学

Journal of biomechanics Pub Date : 2025-07-03 DOI: 10.1016/j.jbiomech.2025.112850

Paula R Soares Procópio , Rafael Zambelli Pinto , Bárbara A Junqueira Murta , Paola Figueiredo Caldeira , Priscila Albuquerque Araújo , Robert Schleip , Sérgio Teixeira Fonseca , Renan Alves Resende , Juliana Melo Ocarino

{"title":"Individuals with chronic low back pain have reduced myofascial force transmission between latissimus dorsi and contralateral gluteus maximus muscles","authors":"Paula R Soares Procópio , Rafael Zambelli Pinto , Bárbara A Junqueira Murta , Paola Figueiredo Caldeira , Priscila Albuquerque Araújo , Robert Schleip , Sérgio Teixeira Fonseca , Renan Alves Resende , Juliana Melo Ocarino","doi":"10.1016/j.jbiomech.2025.112850","DOIUrl":"10.1016/j.jbiomech.2025.112850","url":null,"abstract":"<div><div>The thoracolumbar fascia is essential in lumbar stabilization and is considered a path of transmitting myofascial force. This study investigates whether there is a difference in the myofascial force transmission between latissimus dorsi and contralateral gluteus maximus in individuals with and without chronic low back pain (CLBP). Forty-eight individuals were divided into CLBP and control groups. Outcome variables were evaluated in two experimental conditions: relaxed and contracted latissimus dorsi. Lumbar stiffness was assessed using a non-invasive digital indentometer, and passive properties of the contralateral hip (resting position, torque and stiffness) were evaluated using an isokinetic dynamometer. Trunk and hip muscle activation was monitored with electromyography. Data were analyzed using two-way ANOVA. Latissimus dorsi contraction increased lumbar stiffness in both groups (p < 0.001) compared to the relaxed condition. However, only the control group showed a change in the hip resting position toward greater lateral rotation and an increase in passive hip torque with latissimus dorsi contraction compared to the relaxed condition (p < 0.001). Additionally, latissimus dorsi contraction led to a small and clinically non-relevant increase in passive hip stiffness (below the standard error of measurement) in both groups when compared to the relaxed condition. The results demonstrated that the myofascial force transmission between latissimus dorsi and contralateral gluteus maximus is reduced in individuals with CLBP, since the latissimus dorsi contraction changed the passive properties only in the adjacent tissues (lumbar region) but not in tissues more distant from the origin of the traction.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"190 ","pages":"Article 112850"},"PeriodicalIF":2.4,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144556929","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