Journal of biomechanics最新文献

Age-Related changes in joint power during gait: Adaptations in middle-aged adults to maintain walking speed

IF 2.4 3区医学

Journal of biomechanics Pub Date : 2025-04-12 DOI: 10.1016/j.jbiomech.2025.112692

B.C Muir , J.M. Haddad , R.E.A. van Emmerik , S. Rietdyk

{"title":"Age-Related changes in joint power during gait: Adaptations in middle-aged adults to maintain walking speed","authors":"B.C Muir , J.M. Haddad , R.E.A. van Emmerik , S. Rietdyk","doi":"10.1016/j.jbiomech.2025.112692","DOIUrl":"10.1016/j.jbiomech.2025.112692","url":null,"abstract":"<div><div>Across the adult lifespan, gait speed is thought to be maintained through midlife and starts to decrease after age 60. Reducing the piston-like drive of the gastrocnemius during push-off (ankle joint power burst A2) is a change that decreases gait speed and increases stability in older adults. As physiological systems begin to decline during midlife, middle-aged adults may adjust their joint powers to minimize destabilization while maintaining a gait speed comparable to that of younger adults. The purpose is to quantify changes in joint powers during gait as a function of advancing age; younger (ages 20–35), middle-aged (ages 50–64), and older adults (ages 65–79). Participants walked at their self-selected speed, for ten trials, along a 15 m walkway. Joint powers for the hip, knee, and ankle were calculated. Older adults walked slower (1.33 m/s) than the younger and middle-aged groups (1.44 and 1.44 m/s, respectively). Middle-aged and older adults had lower ankle energy generation (A2) than younger adults. Middle-aged adults had lower ankle energy absorption (A1) than the other two age groups. Lower A2 reduces the piston-like push-off during late stance presumably to reduce the associated instability. However, the reduced energy generation did not decrease speed in middle-aged adults because energy absorption was reduced during mid-stance (A1). The reduced absorption allowed the body to rotate forward over the ankle faster and maintain gait speed despite reduced energy generation during push-off. Thus, middle-aged adults flexibly adapted both energy generation and absorption to maintain gait speed, a novel finding.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"185 ","pages":"Article 112692"},"PeriodicalIF":2.4,"publicationDate":"2025-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143824408","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

AI-based human whole-body posture-prediction in continuous load reaching/leaving activities

IF 2.4 3区医学

Journal of biomechanics Pub Date : 2025-04-09 DOI: 10.1016/j.jbiomech.2025.112681

Reza Ahmadi, Mahdi Mohseni, Navid Arjmand

{"title":"AI-based human whole-body posture-prediction in continuous load reaching/leaving activities","authors":"Reza Ahmadi, Mahdi Mohseni, Navid Arjmand","doi":"10.1016/j.jbiomech.2025.112681","DOIUrl":"10.1016/j.jbiomech.2025.112681","url":null,"abstract":"<div><div>Determining worker’s body posture during load handling activities is the first step toward assessing and managing occupational risk of musculoskeletal injuries. Traditional approaches for the measurement of body posture are impractical in real work settings due to the required laboratory setups and occlusion issues. This study aims to develop artificial neural networks (ANNs) to predict full-body 3D continuous posture during load-reaching and load-leaving phases of lifting and lowering activities thus complementing our previous posture prediction ANNs for the load-moving phase (i.e., the lifting activity between load-reaching and load-leaving phases). Using an existing whole-body motion dataset from twenty healthy young novice subjects during 204 load-reaching and load-leaving tasks, four ANNs were developed to estimate body continuous coordinates and segment/joint angles based on task- and subject-specific parameters as inputs. Results indicated that the developed ANNs achieved root-mean-square-errors of <3 cm and <10° for load-reaching and <4 cm and <15° for load-leaving tasks for the whole-body under random hold-out validation. The maximum posture prediction errors were observed at the left side of the body and the prediction errors were larger during the second half of the activities. Compared to prior static posture prediction models, our approach enabled continuous, phase-specific posture prediction thereby improving relevance for ergonomic and biomechanical applications. Although further investigations are required across diverse demographics (e.g., for female, elderly, experienced individuals), the present ANNs represent a step toward more accessible posture prediction tools in occupational settings, potentially reducing data collection demands for ergonomic assessments.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"185 ","pages":"Article 112681"},"PeriodicalIF":2.4,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143820690","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

Mechanical and biological characteristics of 3D-printed auxetic structure in bone tissue engineering

IF 2.4 3区医学

Journal of biomechanics Pub Date : 2025-04-08 DOI: 10.1016/j.jbiomech.2025.112685

Xuezheng Geng , Yan Yao , Huiwen Huang , Qiao Li , Lizhen Wang , Yubo Fan

{"title":"Mechanical and biological characteristics of 3D-printed auxetic structure in bone tissue engineering","authors":"Xuezheng Geng , Yan Yao , Huiwen Huang , Qiao Li , Lizhen Wang , Yubo Fan","doi":"10.1016/j.jbiomech.2025.112685","DOIUrl":"10.1016/j.jbiomech.2025.112685","url":null,"abstract":"<div><div>The auxetic structures are highly effective in bone implants due to their unique deformation characteristics. However, ideal tissue engineering scaffolds must possess suitable mechanical properties and biocompatibility. The biological effects of auxetic structures require further study. In this study, three types of 3D re-entrant honeycomb structures with varying angles of 75°, 90°, and 105° were designed. These structures were fabricated by stereolithography 3D printing technology. Finite element simulations and compression tests were conducted to evaluate their mechanical properties. Scaffolds were inoculated with preosteoblast MC3T3-E1 cells, and cyclic loading was applied to investigate the influence of structural and mechanical stimulation on cell arrangement and proliferation. The results demonstrated that the 75° scaffold exhibited auxetic characteristics in all compression directions and possessed anti-fracture properties. The 75° scaffold also promoted cell proliferation by structural design. Cyclic compression facilitated the nuclear translocation of YAP, further enhancing cell growth. The combination of anti-fracture properties and the promotion of cell proliferation makes auxetic structures highly promising for extensive applications.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"184 ","pages":"Article 112685"},"PeriodicalIF":2.4,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143815681","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

Comparison of markerless and marker-based motion analysis accounting for differences in local reference frame orientation

IF 2.4 3区医学

Journal of biomechanics Pub Date : 2025-04-08 DOI: 10.1016/j.jbiomech.2025.112683

Camilla Antognini , Ariana Ortigas-Vásquez , Christopher Knowlton , Michael Utz , Adrian Sauer , Markus A. Wimmer

{"title":"Comparison of markerless and marker-based motion analysis accounting for differences in local reference frame orientation","authors":"Camilla Antognini , Ariana Ortigas-Vásquez , Christopher Knowlton , Michael Utz , Adrian Sauer , Markus A. Wimmer","doi":"10.1016/j.jbiomech.2025.112683","DOIUrl":"10.1016/j.jbiomech.2025.112683","url":null,"abstract":"<div><div>Markerless motion analysis offers a promising alternative to traditional marker-based motion capture. Differences between the kinematic signals obtained with these systems have been reported, but the hypothesis that these differences stem from reference frame alignment inconsistencies has not been systematically assessed. This study aims to apply a reference frame alignment method (REFRAME) to markerless captured knee kinematic signals to determine if inconsistencies with marker-based results are related to differences in local frame orientation. Ten healthy subjects (5/5 M/F, age 26.8 ± 5.6 years, 21.5 ± 1.8 kg/m<sup>2</sup>) were recruited to perform five walking trials each. Data was simultaneously recorded using eight video cameras (Miqus, Qualisys) for the markerless capture system (Theia3D), and twenty-four cameras (Oqus and Arqus, Qualisys) for the marker-based system (Qualisys). Both sets of processed data were exported for kinematic analysis in Visual3D (C-Motion). Implementing the REFRAME approach optimized the markerless kinematic signals towards the marker-based system, resulting in an average rotation of the tibia coordinate system of 13.8° ± 3.1° and 4.9° ± 3.6° around the y- and z-axes, respectively, and 5.3° ± 2.8°, 5.8° ± 2.4°, and 7.9° ± 4.9° for the femur coordinate system around the x-, y-, and z-axes, respectively. Post-REFRAME results showed improved agreement between markerless and marker-based data in all three planes. The root-mean-square error decreased from 3.9° ± 1.5° to 1.7° ± 0.2° (sagittal plane), from 6.1° ± 1.3° to 1.7° ± 0.3° (frontal plane), and from 10.2° ± 2.8° to 2.5° ± 0.5° (transverse plane). These findings indicate that most of the differences between markerless and marker-based data are likely due to inconsistencies in local frame orientations, suggesting that markerless kinematic signals represent fundamentally similar underlying motion waveforms.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"185 ","pages":"Article 112683"},"PeriodicalIF":2.4,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143820689","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

Dynamic response of the aortic hemodynamic status to endovascular occlusion: A computational fluid dynamics study

IF 2.4 3区医学

Journal of biomechanics Pub Date : 2025-04-05 DOI: 10.1016/j.jbiomech.2025.112680

Zhongyou Li , Anyu Hou , Jiyang Zhang , Fei Gao , Feng Yan , Lingjun Liu , Taoping Bai , Ming Zhang , Wentao Jiang

{"title":"Dynamic response of the aortic hemodynamic status to endovascular occlusion: A computational fluid dynamics study","authors":"Zhongyou Li , Anyu Hou , Jiyang Zhang , Fei Gao , Feng Yan , Lingjun Liu , Taoping Bai , Ming Zhang , Wentao Jiang","doi":"10.1016/j.jbiomech.2025.112680","DOIUrl":"10.1016/j.jbiomech.2025.112680","url":null,"abstract":"<div><div>The hemodynamic status following occlusion is crucial to the efficacy of resuscitative endovascular balloon occlusion of the aorta (REBOA), but existing information on this topic remains limited. This study clarifies the remodeling effects of REBOA on aortic hemodynamics. A geometric model of the aorta, derived from human imaging, is used to simulate various hemorrhagic scenarios (blood loss = 10 %, 25 %, 35 %, and 40 %) through reductions in cardiac output and increases in heart rate. Fluid-structure interaction simulations are performed to explore the relationship between blood pressure, cerebral perfusion, arterial deformation, and blood loss following thoracic aortic occlusion. The results indicated that, when the cerebral blood flow tolerance is reduced by 50 %, the recommended blood loss range for REBOA use is approximately 23.9–30.8 %, corresponding to an initial blood pressure range of 53–71 mmHg. Blood loss < 16.8 % (>90 mmHg) does not necessitate occlusion, whereas blood loss between 16.8 % and 23.9 % (71–90 mmHg) may lead to supraphysiological blood pressure and excessive arterial wall deformation. Blood loss > 30.8 % (<53 mmHg) impedes the achievement of reasonable pressure levels. These findings suggest that REBOA is effective only within a specific range of blood loss. Exceeding or falling below these thresholds can lead to adverse effects, such as hypertension or hemodynamic instability. These findings hold significant clinical relevance for emergency care.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"184 ","pages":"Article 112680"},"PeriodicalIF":2.4,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143808717","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

Time course of Quadriceps thickness changes over six months post-anterior cruciate ligament reconstruction: Unveiling critical impairments in vastii muscles

IF 2.4 3区医学

Journal of biomechanics Pub Date : 2025-04-04 DOI: 10.1016/j.jbiomech.2025.112664

Carlos De la Fuente , Rony Silvestre , Eduardo Martinez-Valdes , Roberto Yañez , Ferran Abat , Alejandro Neira , André Gustavo de Andrade , Felipe P Carpes

{"title":"Time course of Quadriceps thickness changes over six months post-anterior cruciate ligament reconstruction: Unveiling critical impairments in vastii muscles","authors":"Carlos De la Fuente , Rony Silvestre , Eduardo Martinez-Valdes , Roberto Yañez , Ferran Abat , Alejandro Neira , André Gustavo de Andrade , Felipe P Carpes","doi":"10.1016/j.jbiomech.2025.112664","DOIUrl":"10.1016/j.jbiomech.2025.112664","url":null,"abstract":"<div><div>Vastii muscle adaptation caused by Quadriceps weakness observed after an Anterior Cruciate Ligament reconstruction (ACLr) remain debatable. We described the time course of changes in Quadriceps thickness, strength, and thigh circumference over six months following an ACLr. Quadriceps thicknesses, Quadriceps strength, and thigh circumference were measured preoperative, 3, and 6 months post-ACLr surgery in 103 patients (77 men and 26 women). Limbs and time were compared with repeated-measures ANOVA and the Intra-class correlation coefficient was determined (α = 5 %). From 0 to 3 months post-surgery, Quadriceps strength (p < 0.05), and VI (p < 0.05) and VL (p < 0.001) thicknesses were reduced. From 3 to 6 months, Quadriceps strength (p < 0.05), total Quadriceps thickness (p < 0.001), and VI (p < 0.001) and VL (p < 0.05) thicknesses increased. VM and RF thicknesses increase to 3 months after ACLr (p < 0.05). Quadriceps strength, circumference at 5 cm, VI, VL, VM, and total Quadriceps thickness remain lower than the contralateral limb 6 months following an ACLr (p < 0.05). Quadriceps thickness adapts heterogeneously, with VI and VL atrophying for up to three months, developing the highest Quadriceps weakness. By 6 months, VI does not recover its thickness proportion, and VI and VL do not return to pre-surgery conditions. Both vastii muscles align with Quadriceps strength changes over six months posterior ACLr.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"184 ","pages":"Article 112664"},"PeriodicalIF":2.4,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143808719","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

Bending moments of PEEK-based root analog implants (RAIs)

IF 2.4 3区医学

Journal of biomechanics Pub Date : 2025-04-04 DOI: 10.1016/j.jbiomech.2025.112677

Ufuk Adali , Felizia Kesler , Jamila Yassine , Franziska Schmidt , Mats Wernfried Heinrich Böse , Hui Zhu , Changning Sun , Chuncheng Yang , Dichen Li , Robert Nicic , Maren Soetebeer , Guido Sterzenbach , Andreas Dominik Schwitalla

{"title":"Bending moments of PEEK-based root analog implants (RAIs)","authors":"Ufuk Adali , Felizia Kesler , Jamila Yassine , Franziska Schmidt , Mats Wernfried Heinrich Böse , Hui Zhu , Changning Sun , Chuncheng Yang , Dichen Li , Robert Nicic , Maren Soetebeer , Guido Sterzenbach , Andreas Dominik Schwitalla","doi":"10.1016/j.jbiomech.2025.112677","DOIUrl":"10.1016/j.jbiomech.2025.112677","url":null,"abstract":"<div><div>Root-analog implants are frequently fabricated from titanium, which can be associated with various problems, e.g. hypersensitivity to titanium. In this study, we evaluate the bending moments of different polyetheretherketone-based root analog implants as a metal-free alternative. For this, an extracted tooth 31 and 36 was scanned to create an STL data set of each tooth. These were used to fabricate n = 8 polyetheretherketone-based root analog implants per group, with 5 groups being fabricated per tooth type. Two groups were additively manufactured using material extrusion. The other groups were milled from differnet polyetheretherketone grades. After artificial ageing, the samples were statically loaded until fracture in order to determine the bending moment.</div><div>Of the root analog implants in the form of a 31, a white, milled polyetheretherketone grade showed the highest bending moment of 2835.3 ± 509.8 Nmm and an unfilled, additively processed polyetheretherketone grade the lowest. Of the RAIs in the form of a 36, an unfilled, milled polyetheretherketone grade showed the highest bending moment with 29342.6 ± 854.7 Nmm and a white, additively processed polyetheretherketone grade showed the lowest bending moment with 19880.5 ± 7188.6 Nmm. Basically, the results between the additively and subtractively processed groups were significantly different.</div><div>In terms of mechanical requirements in the oral cavity, one-piece milled polyetheretherketone −based RAIs appear to provide more predictable results than additively manufactured ones.</div><div>Taken together, our study suggests that more solidly designed one-piece root analog implants made of milled polyetheretherketone in the form of molars appear to be able to withstand the mechanical requirements of the oral cavity.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"184 ","pages":"Article 112677"},"PeriodicalIF":2.4,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143785303","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

How are athletes trained to move? A systematic review exploring the effects of implicit and explicit learning on biomechanics of sport-specific tasks

IF 2.4 3区医学

Journal of biomechanics Pub Date : 2025-04-04 DOI: 10.1016/j.jbiomech.2025.112671

E.M. Nijmeijer , F.D. Brals , M. Kempe , M.T. Elferink-Gemser , A. Benjaminse

{"title":"How are athletes trained to move? A systematic review exploring the effects of implicit and explicit learning on biomechanics of sport-specific tasks","authors":"E.M. Nijmeijer , F.D. Brals , M. Kempe , M.T. Elferink-Gemser , A. Benjaminse","doi":"10.1016/j.jbiomech.2025.112671","DOIUrl":"10.1016/j.jbiomech.2025.112671","url":null,"abstract":"<div><div>Motor learning might reduce the likelihood of sports injuries by improving movement patterns. This review aimed to critically evaluate and summarize the effects of implicit (IL) and explicit (EL) motor learning on selected biomechanical variables while executing sport-specific tasks. PubMed, Embase, and Cinahl were searched according to PRISMA guidelines. The protocol was registered in PROSPERO (ID: CRD42023390982). Randomised controlled trials published before February 2024, with healthy participants (≥11 years) performing a sport-specific task were considered. Intervention evaluation, at least one kinematic or kinetic value as dependent variable, needed to be minimally one night post-practice. The changes in biomechanical outcomes were considered regarding the goal of the included study and their effect sizes were assessed. Methodological quality was based on the Revised Cochrane Risk-of-Bias tool. Of 18,639 records identified, 25 studies were included leading to 60 comparisons between IL and control (CTRL), EL and CTRL, or IL and EL. In total, the 1020 (520 male, 20.0 ± 3.7 years, 14–91 per study) participants playedvarious sports, from recreational to elite level. External and internal focus of attention, differential learning, analogy, non-linear and linear pedagogy, and observational learning were included.. An overall small positive effect size of IL compared to CTRL group changes was found (<em>g</em> = 0.45 [0.115 – 0.780], <em>p</em> = 0.01). Although premature, IL shows more potential than EL for improving biomechanics of sport-specific tasks. Therefore, practitioners may consider incorporating IL into injury prevention programs. Lastly, recommendations about strengthening research methodology of motor learning studies using biomechanical outcomes are provided.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"184 ","pages":"Article 112671"},"PeriodicalIF":2.4,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143799652","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Test-retest reliability of a dance-specific jump test using wearable technology among university contemporary dancers

IF 2.4 3区医学

Journal of biomechanics Pub Date : 2025-04-04 DOI: 10.1016/j.jbiomech.2025.112644

Meghan L. Critchley , Lauren C. Benson , Reed Ferber , Kati Pasanen , Sarah J. Kenny

{"title":"Test-retest reliability of a dance-specific jump test using wearable technology among university contemporary dancers","authors":"Meghan L. Critchley , Lauren C. Benson , Reed Ferber , Kati Pasanen , Sarah J. Kenny","doi":"10.1016/j.jbiomech.2025.112644","DOIUrl":"10.1016/j.jbiomech.2025.112644","url":null,"abstract":"<div><div>A dance-specific jump test utilizing inertial measurement units (IMUs) to determine limb symmetry indices (LSI) may prove useful for clinicians responsible for dancer populations.</div><div>The aim of this study was to determine test–retest reliability of a dance-specific jump test using wearable technology to capture limb asymmetry in university contemporary dancers. Nineteen female undergraduate dance majors participated in two testing sessions one week apart. IMUs (Vicon Motion Systems, UK) were attached to the distal anteromedial aspect of each tibia and at the L5/S1 joint. Participants performed three jumps: countermovement jump (CMJ), a single leg side hop (SH), and a dance-specific jump (DSJ). Test-retest reliability of asymmetry measures [i.e., peak impact acceleration (g), mean asymmetry (%)] and performance measures [i.e., flight time (sec), time to completion (sec), and jump height (cm)] were estimated using intraclass correlation coefficients [ICCs (95% CI)] and Bland Altman methods of agreement [95% limits of agreement (LOA)]. For asymmetry measures, reliability was poor for CMJ [ICC 0.36 (95% CI −0.08–0.77)], moderate for SH [ICC 0.66 (95% CI 0.35–0.88)] and good for DSJ [ICC 0.82 (95% CI 0.49–0.94)]. Wide 95% LOA were demonstrated for all jumps. For performance measures, moderate to good reliability and acceptable LOA were found for all jumps. While a lack of agreement was found for asymmetry measures, sufficient reliability and acceptable agreement were established for performance measures for all jump tests in university contemporary dancers. This method may be used to monitor the performance of jumps and jump load throughout a training season.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"184 ","pages":"Article 112644"},"PeriodicalIF":2.4,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143799654","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

Upper and lower limb muscle stiffness in children with cerebral palsy compared to typically developing children: Insights from shear wave elastography

IF 2.4 3区医学

Journal of biomechanics Pub Date : 2025-04-02 DOI: 10.1016/j.jbiomech.2025.112667

Dolors Casellas-Vidal , Raquel Font-Lladó , Inés Osiniri , Maria Camós-Carreras , Aintzane Ruiz-Eizmendi , Juan Serrano-Ferrer , Joaquim Casellas , Abel López-Bermejo , Anna Prats-Puig

{"title":"Upper and lower limb muscle stiffness in children with cerebral palsy compared to typically developing children: Insights from shear wave elastography","authors":"Dolors Casellas-Vidal , Raquel Font-Lladó , Inés Osiniri , Maria Camós-Carreras , Aintzane Ruiz-Eizmendi , Juan Serrano-Ferrer , Joaquim Casellas , Abel López-Bermejo , Anna Prats-Puig","doi":"10.1016/j.jbiomech.2025.112667","DOIUrl":"10.1016/j.jbiomech.2025.112667","url":null,"abstract":"<div><div>Children with spastic cerebral palsy (CP) experience altered muscle tone due to biomechanical changes, traditionally assessed through clinical scales. Shear wave elastography (SWE) offers a non-invasive way to quantify these changes. This study aimed to compare SWE measurements in spastic CP and typically developing (TD) children and investigate influencing factors such as joint position, range of motion, demographics, physical condition and, in CP children, the characteristics of CP. It also examined correlations between SWE measurements and spasticity scales in CP children. SWE measured the elastic modulus (kPa) of biceps brachii (BB), pronator teres (PT), adductor longus (AL), lateral gastrocnemius (LG), and soleus (SOL) muscles at rest and during maximum passive stretching (MPS) in 34 spastic CP children (age: 3–17) and 44 TD children (age: 3–14). Significant differences (<em>p <</em> 0.05) in SWE were found between CP and TD children. CP children had lower values in upper limb muscles and higher values in lower limb muscles at rest, with the opposite pattern during MPS. The Ashworth and Tardieu scales were associated with the elastic modulus in lower limb muscles (AL, GL, and SOL) at rest in CP children. Variations in elastic modulus at rest and MPS between upper and lower limbs and in spastic CP and TD children were revealed with no consistent correlation with spasticity scales. These variations were linked to neurological dysregulation and muscle architecture, with joint structures also affecting. SWE may offer a more precise assessment of muscle spasticity, minimizing the impact of confounding joint structures.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"184 ","pages":"Article 112667"},"PeriodicalIF":2.4,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143777234","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