Journal of biomechanics最新文献_第3页

Classification of young adult motor fluctuation phenotypes in gait. 年轻人步态运动波动表型的分类。

IF 2.4 3区医学

Journal of biomechanics Pub Date : 2025-02-01 Epub Date: 2025-01-10 DOI: 10.1016/j.jbiomech.2025.112523

Christopher A Bailey, Alexandre Mir-Orefice, Julie Nantel, Ryan B Graham

{"title":"Classification of young adult motor fluctuation phenotypes in gait.","authors":"Christopher A Bailey, Alexandre Mir-Orefice, Julie Nantel, Ryan B Graham","doi":"10.1016/j.jbiomech.2025.112523","DOIUrl":"10.1016/j.jbiomech.2025.112523","url":null,"abstract":"Stride-to-stride fluctuations are natural in gait. These fluctuations are marked by inter-individual variability, suggesting that different fluctuation strategies (i.e., phenotypes) may exist. This study investigates the presence of gait fluctuation phenotypes. Whole-body kinematics were measured from young, healthy males and females (N = 51) while walking on a treadmill at their preferred speed. Motor fluctuation metrics (i.e., magnitude of variability, local dynamic stability, and regularity) were measured for 32 joint angles across the upper and lower body. These metrics were reduced to principal components (PCs) via principal component analysis and then grouped into clusters using the k-means method. One-way ANOVAs were conducted to test for cluster differences in motor fluctuation PCs. Three PCs were extracted, explaining 39.7 % of all 96 motor fluctuation metrics. Higher PC1 scores represent more fluctuation across all joints, higher PC2 scores represent greater upper limb fluctuations with fewer fluctuations in the lower limb, and PC3 scores represent less regularity in fluctuations. PC scores best grouped into four clusters in 54.0 % of iterations. Clusters 1-4 each had a significantly different PC1 score (p < 0.022), and Cluster 3 had a higher PC2 score than all other clusters (p < 0.022). Motor fluctuations in treadmill gait of young adults were characterised by four gait fluctuation phenotypes, interpreted as repeaters, replacers, moderate fluctuators, and mixed fluctuators (i.e. more upper limb but fewer lower limb fluctuations); extending the repeaters vs replacers hypothesis. The identified phenotypes add a new perspective that may help clarify the link between motor fluctuations and gait instability.","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"180 ","pages":"112523"},"PeriodicalIF":2.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143005225","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

Modified chevron osteotomy for the treatment of hallux valgus with unison bioabsorbable screws: Biomechanical research and clinical applications. 改良v形截骨术治疗拇外翻的生物力学研究及临床应用。

IF 2.4 3区医学

Journal of biomechanics Pub Date : 2025-02-01 Epub Date: 2025-01-15 DOI: 10.1016/j.jbiomech.2025.112527

Changyi Liu, Dongqi Li, Songning Ma, Hanyang Zhang, Shizhong Zhang, Fei Chang, Peng Liu, Hongwei Zhao, Shuo Jin

{"title":"Modified chevron osteotomy for the treatment of hallux valgus with unison bioabsorbable screws: Biomechanical research and clinical applications.","authors":"Changyi Liu, Dongqi Li, Songning Ma, Hanyang Zhang, Shizhong Zhang, Fei Chang, Peng Liu, Hongwei Zhao, Shuo Jin","doi":"10.1016/j.jbiomech.2025.112527","DOIUrl":"10.1016/j.jbiomech.2025.112527","url":null,"abstract":"Researchers have modified PLA materials to enhance their mechanical properties and meet the clinical requirements. However, the strength and stiffness of PLA are still significantly lower than those of metals. Building on the established chevron clinical procedure and considering the mechanical characteristics of PLA screws, we devised a modified chevron osteotomy (MCO) based on a load-reducing structure with the aim of reducing the load on the screws. Subsequently, in vitro quasi-static in situ compression and dynamic fatigue tests were conducted for both procedures. DIC, micro-CT, and SEM were used to elucidate the unloading effects and structural damage of different bone cutting and implant locations on the PLA bone screws, providing biomechanical data for clinical applications. In-vitro simulation studies indicated that the unloading structure of the MCO procedure reduced the load borne by the PLA screws. Within the load range of the first metatarsal during walking, the MCO procedure exhibited a compressive strength 2.5 times that of the traditional chevron osteotomy groups and even exceeded the titanium alloy screw groups by 25%, ensuring PLA screw fixation strength and stability that are not inferior to metallic materials. A stable load-reducing structure in osteotomy procedures is the key to PLA materials becoming viable alternatives to metal orthopedic fixation devices.","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"180 ","pages":"112527"},"PeriodicalIF":2.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143005432","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 shank, rearfoot and forefoot coordination and its variability between runners with different strike patterns. 不同击球方式跑步者小腿、后脚和前脚协调性及其可变性的比较。

IF 2.4 3区医学

Journal of biomechanics Pub Date : 2025-02-01 Epub Date: 2025-01-03 DOI: 10.1016/j.jbiomech.2025.112494

Zhen Wei, Hang Xu, Weiquan Zhong, Lin Wang

{"title":"Comparison of shank, rearfoot and forefoot coordination and its variability between runners with different strike patterns.","authors":"Zhen Wei, Hang Xu, Weiquan Zhong, Lin Wang","doi":"10.1016/j.jbiomech.2025.112494","DOIUrl":"10.1016/j.jbiomech.2025.112494","url":null,"abstract":"This study aims to compare shank, rearfoot and forefoot coordination and its variability between runners with habitual rearfoot strike (RFS) and non-RFS (NRFS). 58 healthy males participated in this study (32 RFS, 26 NRFS). Coordination patterns and variability were assessed for the shank, rearfoot, and forefoot segments using a modified vector coding technique during running. RFS runners exhibited significantly greater proportion of anti-phase with distal dominancy (rearfoot) during early and mid-stance, as well as a lower proportion of anti-phase with proximal dominancy (shank) during early stance compared to NRFS runners in frontal rearfoot - transverse shank (FRTS). Conversely, NRFS runners demonstrated significantly greater proportion of anti-phase with distal dominance (forefoot) in the sagittal, frontal, and transverse planes during early stance compared to RFS runners. Coordination variabilities for the FRTS (late stance), frontal rearfoot - frontal forefoot (FRFF) (early and late stance), and frontal rearfoot - transverse forefoot (FRTF) (mid stance) were greater in NRFS than in RFS runners. In contrast, coordination variability for frontal rearfoot - sagittal forefoot (FRSF) (early stance) was greater in RFS than in NRFS runners. The results could further extend the relationship between foot strike pattern and injuries from the perspective of coordination and its variability. Preliminary findings suggest that NRFS runners could benefit from intrinsic foot muscle training to mitigate the sustained loads on the soft tissues of the foot.","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"180 ","pages":"112494"},"PeriodicalIF":2.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142931802","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

1D Network computational fluid dynamics for evaluating regional pressures in subjects with cement dust exposure. 一维网络计算流体动力学用于评估水泥粉尘暴露受试者的区域压力。

IF 2.4 3区医学

Journal of biomechanics Pub Date : 2025-02-01 Epub Date: 2025-01-03 DOI: 10.1016/j.jbiomech.2025.112501

Minh Tam Tran, Quoc Hung Nguyen, Xinguang Cui, Kum Ju Chae, Sujeong Kim, Ji-Seung Yoo, Sanghun Choi

{"title":"1D Network computational fluid dynamics for evaluating regional pressures in subjects with cement dust exposure.","authors":"Minh Tam Tran, Quoc Hung Nguyen, Xinguang Cui, Kum Ju Chae, Sujeong Kim, Ji-Seung Yoo, Sanghun Choi","doi":"10.1016/j.jbiomech.2025.112501","DOIUrl":"10.1016/j.jbiomech.2025.112501","url":null,"abstract":"Cement dust is a primary contributor to air pollution and is responsible for causing numerous respiratory diseases. The impact of cement dust exposure on the respiratory health of residents is increasing owing to the demand for construction associated with urbanization. Long-term inhalation of cement dust leads to a reduction in lung function, alterations in airway structure, increased inhalation and exhalation resistance, and heightened work of breath. In this study, we investigated the effects of cement dust exposure on lung function based on the pulmonary function test (PFT) and one-dimensional computational fluid dynamics (1D CFD). Statistical tests were performed to address the disparity of airway function between healthy and cement dust-exposed participants. The percent predicted values of forced vital capacity percent (FVC%) and forced expiratory volume in 1 s (FEV1%) were found to be decreased in the group of dust-exposed participants. An elevation of regional pressure variation was found in cement dust-exposed airways during both inhalation and exhalation that was associated with alternations of airway structural features therein. The 1D CFD model is beneficial for a cost-effective estimation of airway regional pressure and provides valuable insights for more precise diagnosis and treatment planning in individuals exposed to cement dust.","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"180 ","pages":"112501"},"PeriodicalIF":2.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142949332","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

Linear and angular impulse generated by high school pitchers during fastballs and changeups.

IF 2.4 3区医学

Journal of biomechanics Pub Date : 2025-01-23 DOI: 10.1016/j.jbiomech.2025.112550

Samantha Gajda, Jun Ming Liu, Janine Molino, Christopher Knowlton, Matthew Gauthier, Zach Tropp, Nikhil Verma, Gregory Nicholson, Anthony Romeo, Antonia Zaferiou

{"title":"Linear and angular impulse generated by high school pitchers during fastballs and changeups.","authors":"Samantha Gajda, Jun Ming Liu, Janine Molino, Christopher Knowlton, Matthew Gauthier, Zach Tropp, Nikhil Verma, Gregory Nicholson, Anthony Romeo, Antonia Zaferiou","doi":"10.1016/j.jbiomech.2025.112550","DOIUrl":"https://doi.org/10.1016/j.jbiomech.2025.112550","url":null,"abstract":"This study revealed how high school pitchers generated momenta during fastballs and changeups at a whole-body level. Baseball pitchers control ground reaction forces to generate whole-body momentum. Pitchers attempt to throw as fast and accurately as possible during fastballs but also need to throw off-speed pitches like changeups to deceive batters. To understand whole-body momenta generation in fastballs and changeups, this study aimed to determine (a) the roles of each leg in impulse generation in high school pitchers, (b) if these impulses differed between fastballs and changeups, and (c) if net impulses related to ball speed. Linear mixed models revealed that the back leg generated significantly more forward linear impulse (p < 0.0001) and more angular impulse about the leftward (p < 0.0001) and upward axes (p < 0.0001) than the lead leg in fastballs and changeups as a group and within each pitcher. However, when comparing fastballs and changeups, there were no significant differences in net forward linear impulse (p = 0.71) or net angular impulse about the leftward axis (p = 0.42) or about the upward axis (p = 0.72) at the group-level, despite significantly greater ball speeds during fastballs (p < 0.0001). This study did not detect any significant group-level associations between ball speed and net forward linear impulse (p = 0.6 for fastballs, p = 0.81 for changeups) or net angular impulse about leftward axis (p = 0.52 for fastballs, p = 0.35 for changeups) or about the upward axis (p = 0.76 for fastballs and changeups) during fastballs or changeups, though some participants exhibited trends between impulses and ball speed individually.","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"181 ","pages":"112550"},"PeriodicalIF":2.4,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143046752","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 between the fluid-structure interaction approach and the finite element method approach to analyze the leaflet flutter in bioprosthetic aortic valve.

IF 2.4 3区医学

Journal of biomechanics Pub Date : 2025-01-23 DOI: 10.1016/j.jbiomech.2025.112532

Matheus Carvalho Barbosa Costa, Saulo de Freitas Gonçalves, João Victor Curado Fleury, Mário Luis Ferreira da Silva, Rudolf Huebner, Artur Henrique de Freitas Avelar

{"title":"Comparison between the fluid-structure interaction approach and the finite element method approach to analyze the leaflet flutter in bioprosthetic aortic valve.","authors":"Matheus Carvalho Barbosa Costa, Saulo de Freitas Gonçalves, João Victor Curado Fleury, Mário Luis Ferreira da Silva, Rudolf Huebner, Artur Henrique de Freitas Avelar","doi":"10.1016/j.jbiomech.2025.112532","DOIUrl":"https://doi.org/10.1016/j.jbiomech.2025.112532","url":null,"abstract":"The low durability of bioprosthetic heart valves (BHV), between 10-15 years, is associated with the development of leaflets flutter. Despite increasing calcification and structural damage of the BHV, leaflets flutter is an understudied condition. Therefore, the objective of this study is compare the oscillation characteristics of BHV leaflets obtained by the finite element method (FEM) technique and by the fluid-structural interaction (FSI) technique. A BHV geometry and a simplified fluid domain were developed. Physiological ventricular and aortic pressure were applied in the FEM and FSI simulations. The BHV were considered with incompressible hyperelastic and isotropic mechanical behavior, while the blood was modeled as a Newtonian fluid. Turbulence was modeled according to the k - ω SST model. The displacement and maximum principal stress results showed that the FSI approach was in better agreement with the in vitro studies in the literature. Furthermore, the leaflet vibration frequency was 12 times lower and the amplitude 50 times higher compared to the FEM method. From the stress distribution in the leaflets, the highest values occurred in the commissure region of the ventricular side for both techniques. In addition, while the stress was more uniform for FEM, FSI showed a stress concentration in the belly region of the leaflets. This study indicates that the use of the FEM technique to assess fatigue intensification due to leaflet fluttering could induce inaccurate conclusions, since it does not incorporate the dynamic fluid impacts on leaflets.","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"181 ","pages":"112532"},"PeriodicalIF":2.4,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143046737","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

Muscle contributions to propelling the body upward differ between skipping and running. 跳远和跑步时，肌肉对推动身体向上的贡献不同。

IF 2.4 3区医学

Journal of biomechanics Pub Date : 2025-01-22 DOI: 10.1016/j.jbiomech.2025.112545

Sarah A Roelker, John D Willson, Paul DeVita, Richard R Neptune

{"title":"Muscle contributions to propelling the body upward differ between skipping and running.","authors":"Sarah A Roelker, John D Willson, Paul DeVita, Richard R Neptune","doi":"10.1016/j.jbiomech.2025.112545","DOIUrl":"https://doi.org/10.1016/j.jbiomech.2025.112545","url":null,"abstract":"Skipping represents a training alternative to running due to its lower knee contact forces and higher whole-body metabolic cost. The increased metabolic cost of skipping is associated with a higher vertical center-of-mass (COM) displacement during the support and flight phases of the skipping hop compared to running. However, skipping has lower muscle force impulses than running. Therefore, the study purpose was to compare the flow of mechanical power between body segments during skipping and running to determine the mechanisms enabling higher vertical displacement in skipping despite the lower vertical impulse. Running and skipping cycles were simulated in OpenSim for 5 adults (22.4 ± 2.2 y) using motion capture data collected at 2.5 m/s on an instrumented dual-belt treadmill. A segmental power analysis quantified muscle contributions to vertical body segment mechanical power, which were integrated over the stance phase of running (Run) and the hop (Skip 1) and step (Skip 2) of skipping to calculate mechanical work. Higher vertical work was done by the gluteus maximus, vasti, and soleus in Skip 1, primarily through power generation to the trunk, compared to power absorption in Run and Skip 2. Thus, despite lower muscle force impulses in Skip 1, muscles generate power through concentric contractions, leading to greater metabolic cost than in running. These muscle force impulses contribute to propelling the COM upward in Skip 1 (rather than decelerating downward COM motion in Run and Skip 2), which raises the COM and contributes to the greater COM displacement in skipping compared to running.","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"181 ","pages":"112545"},"PeriodicalIF":2.4,"publicationDate":"2025-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143052698","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

Estimation of the effects of hand growth on muscle activation patterns: A musculoskeletal modeling study.

IF 2.4 3区医学

Journal of biomechanics Pub Date : 2025-01-22 DOI: 10.1016/j.jbiomech.2025.112544

Miranda C Ludovice, Katherine R Saul, Derek G Kamper

{"title":"Estimation of the effects of hand growth on muscle activation patterns: A musculoskeletal modeling study.","authors":"Miranda C Ludovice, Katherine R Saul, Derek G Kamper","doi":"10.1016/j.jbiomech.2025.112544","DOIUrl":"https://doi.org/10.1016/j.jbiomech.2025.112544","url":null,"abstract":"Throughout childhood growth and development, both the nervous and the musculoskeletal systems undergo rapid change. The goal of this study was to examine the impact of growth-related changes in skeletal size and muscle strength on the neural control of finger force generation. By modifying an existing OpenSim hand model in accordance with pediatric anthropometric data, we created 10 distinct models representing males and females at each year of development from 6 to 10 years old. We then used the static optimization tool to estimate the requisite muscle activations to create a maximal palmar force with the index finger in two different postures (metacarpophalangeal, proximal interphalangeal, distal interphalangeal) - Posture 1: (0°, 30°, 0°) and Posture 2: (0°, 60°, 30°). For Posture 1, multiple regression analysis revealed a significant effect of both age and sex on activation for all muscles (p < 0.035) with exception of the flexor digitorum profundus. For Posture 2, only the extensor digitorum communis activation had a significant relationship with age (p = 0.010), while no other muscles showed a significant relationship with age, sex, or the age-sex interaction activation (p > 0.054). Exchanging the activation patterns between the youngest and oldest models altered both the predicted index finger force and direction. Therefore, our simulations suggest that the changes in hand size and morphology associated with growth may necessitate changes in muscle activation patterns to be able to continue to perform a given hand function. Children may need to substantially adjust or even relearn motor control strategies throughout childhood.","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"181 ","pages":"112544"},"PeriodicalIF":2.4,"publicationDate":"2025-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143037720","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

Three-dimensional kinematics in patients with anterior shoulder instability - A systematic review with meta-analysis.

IF 2.4 3区医学

Journal of biomechanics Pub Date : 2025-01-22 DOI: 10.1016/j.jbiomech.2025.112543

Talissa Oliveira Generoso, Vitor La Banca, Felipe F Gonzalez, João Artur Bonadiman, Lucas Valerio Pallone, Eliane C Guadagnin, Grant E Garrigues, Jonathan A Gustafson, Leonardo Metsavaht, Gustavo Leporace

{"title":"Three-dimensional kinematics in patients with anterior shoulder instability - A systematic review with meta-analysis.","authors":"Talissa Oliveira Generoso, Vitor La Banca, Felipe F Gonzalez, João Artur Bonadiman, Lucas Valerio Pallone, Eliane C Guadagnin, Grant E Garrigues, Jonathan A Gustafson, Leonardo Metsavaht, Gustavo Leporace","doi":"10.1016/j.jbiomech.2025.112543","DOIUrl":"https://doi.org/10.1016/j.jbiomech.2025.112543","url":null,"abstract":"Anterior Shoulder Instability (ASI) is a common orthopedic condition often resulting in altered shoulder kinematics. Understanding the biomechanics of the unstable shoulder is critical to determine the most appropriate treatment. This study aims to conduct the first systematic review and meta-analysis of three-dimensional (3D) shoulder kinematic studies in ASI patients. A broad search was conducted within PubMed, Scopus, and Cochrane Library following the PRISMA guidelines. All cross-sectional or longitudinal studies with 3D motion analysis describing shoulder kinematics in patients with ASI were included. The quality of each study was assessed using the MINORS criteria. Qualitative and quantitative analyses were performed. Nine studies were included in the qualitative analysis and two in the meta-analysis. The qualitative review detected conflicting evidence for some parameters. The humeral head had a greater anterior translation in unstable shoulders in three of the studies analyzed, while the difference was not significant in one and another found higher variability for global humeral translation for instability patients. Two studies showed decreased rotation range of motion for unstable shoulders while one did not find significant differences. Conflicting results were also found regarding changes in scapulohumeral rhythm and scapular orientation. The meta-analysis indicated a greater scapulohumeral rhythm on the coronal plane for the instability group, suggesting a relatively greater contribution of motion at the glenohumeral joint compared with the scapulothoracic joint for arm abduction, and reduced glenohumeral peak angles for unstable shoulders. Identifying and quantifying kinematic changes associated with ASI are vital for refining treatment interventions.","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"181 ","pages":"112543"},"PeriodicalIF":2.4,"publicationDate":"2025-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143038614","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

Motor variability regulation analysis in trampolinists.

IF 2.4 3区医学

Journal of biomechanics Pub Date : 2025-01-21 DOI: 10.1016/j.jbiomech.2025.112533

Mathieu Bourgeois, Eve Charbonneau, Craig Turner, Mickaël Begon

{"title":"Motor variability regulation analysis in trampolinists.","authors":"Mathieu Bourgeois, Eve Charbonneau, Craig Turner, Mickaël Begon","doi":"10.1016/j.jbiomech.2025.112533","DOIUrl":"https://doi.org/10.1016/j.jbiomech.2025.112533","url":null,"abstract":"In trampolining, optimizing body orientation during landing reduces injury risk and enhances performance. As trampolinists are subject to motor variability, anticipatory inflight corrections are necessary to regulate their body orientation before landing. We investigated the evolution of a) body orientation and b) limb position (i.e., arms and legs) variabilities. Secondary objectives were to investigate c) the link between acrobatics difficulty and the variability accumulation, and d) to identify links between body orientation variability and gaze orientation. Kinematics and gaze orientation were captured using inertial measurement units and an eye tracker, respectively. Seventeen trampolinists performed up to 13 different acrobatics (different number of rotations in twist and somersault). Intra-trampolinist pelvis orientation and limb position inter-trial variability was computed for each acrobatic at three key timestamps: takeoff, 75 % completion of the twist, and landing. Pelvis orientation variability significantly increased between takeoff and the instant when 75 % of the twist is completed (+75 %) and then decreased from the instant when 75 % of the twist is completed until landing (-39 %). Conversely, limb variability decreased (upper limbs: -66 % and lower limbs: -46 %), before increasing (+357 % and +127 %), suggesting that trampolinists adapted their limb kinematics to regulate pelvis orientation before landing. It was qualitatively observed that this decrease in body orientation variability occurred mostly when trampolinists were looking at the trampoline bed before landing. In addition, there was a moderate correlation between the number of twists in a straight somersault and the variability accumulation at 75 % of the twist, highlighting that trampolinists accumulate more variability as the number of twist rotations increases.","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"181 ","pages":"112533"},"PeriodicalIF":2.4,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143038534","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