Journal of biomechanics最新文献

Lumbopelvic rhythm analysis by quartiles: Identification of differences in lumbar and pelvic contribution during trunk flexion and extension in subjects with low back pain of different origin. A case-control study 按四分位数进行腰椎骨盆节律分析：识别不同原因腰痛患者在躯干屈伸过程中腰部和骨盆贡献的差异。病例对照研究

IF 2.4 3区医学

Journal of biomechanics Pub Date : 2024-11-21 DOI: 10.1016/j.jbiomech.2024.112438

Sandra Alcaraz-Clariana , Lourdes García-Luque , Juan Luis Garrido-Castro , Cristina Carmona-Pérez , Daiana Priscila Rodrigues-de-Souza , María Lourdes Ladehesa Pineda , Francisco Alburquerque-Sendín

{"title":"Lumbopelvic rhythm analysis by quartiles: Identification of differences in lumbar and pelvic contribution during trunk flexion and extension in subjects with low back pain of different origin. A case-control study","authors":"Sandra Alcaraz-Clariana , Lourdes García-Luque , Juan Luis Garrido-Castro , Cristina Carmona-Pérez , Daiana Priscila Rodrigues-de-Souza , María Lourdes Ladehesa Pineda , Francisco Alburquerque-Sendín","doi":"10.1016/j.jbiomech.2024.112438","DOIUrl":"10.1016/j.jbiomech.2024.112438","url":null,"abstract":"<div><div>Low back pain (LBP) can alters spinal kinematics. However, for adequate clinical care, a better understanding of lumbopelvic biomechanical behaviour according to the type of LBP is required. Our objectives were to identify differences in lumbopelvic rhythm (LPR) between subjects with acute low back pain (aLBP), axial spondyloarthritis (axSpA) and healthy subjects. As well as to identify correlations between LPR and sociodemographic and clinical data. In each group of 39 subjects, LPR total and by quartiles (Q) and metrological and clinical data were evaluated. No differences were found in relation to total flexion and LPR extension. However, study by Q showed less movement in aLBP compared to axSpA and healthy subjects at the Lumbar level in Q2 (p = 0.001), Pelvis in Q3 and Q4 and Trunk in Q3 (p=<0.001). In Q4 the aLBP moved the Trunk less than axSpA exclusively [−3,64°(95 % confidence interval − 6.53,−0.74), p = 0.011]. For the extension movement, the Pelvic motion of Q2 was lower for the aLBP group compared to axSpA group [−3,11°(−6.00,−0.22), p = 0.030], and Trunk motion of Q2 and Q3 (p = 0.001, p = 0.007, respectively), and Lumbar mobility of Q3 were also lower compared to axSpA and control groups (p = 0.031). Specific correlations were found for each group. aLBP with BMI, axSpA with metrology and Healthy subjects with age.</div><div>Subjects with aLBP showed less lumbar, pelvic or trunk movement in Q2 and Q3 of trunk flexion and extension movements than axSpA and controls. RPL and its interrelationships with sociodemographic and clinical variables depend on the lumbar condition.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"177 ","pages":"Article 112438"},"PeriodicalIF":2.4,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142704027","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

Shear viscoelastic properties of human orbital fat 人体眼眶脂肪的剪切粘弹特性

IF 2.4 3区医学

Journal of biomechanics Pub Date : 2024-11-19 DOI: 10.1016/j.jbiomech.2024.112416

Somaye Jafari , John Hollister , Pirouz Kavehpour , Joseph L. Demer

{"title":"Shear viscoelastic properties of human orbital fat","authors":"Somaye Jafari , John Hollister , Pirouz Kavehpour , Joseph L. Demer","doi":"10.1016/j.jbiomech.2024.112416","DOIUrl":"10.1016/j.jbiomech.2024.112416","url":null,"abstract":"<div><div>The shear viscoelastic behavior of eye’s supporting orbital fat is unstudied in humans, yet is important during and after rapid movement. This investigation quantified viscoelastic characteristics of human orbital fat in constitutive form suitable for numerical simulation.</div><div>Fresh human orbital fat was harvested postmortem from 6 male and 7 female donors of average age 78 ± 13 years. Fat samples were trimmed to disks of 20 ± 3.0 (standard deviation) mm average diameter and 2.1 ± 0.2 mm thickness. In 8 samples each, the following four testing protocols were performed: strain sweep from 0.0015 <span><math><mrow><mi>t</mi><mi>o</mi></mrow></math></span> 50 % at 1 Hz; viscometry at 0.1 s<sup>−1</sup> shear rate; stress relaxation at physiological temperature; and frequency sweep from 0.159 to 15.9 Hz at 0.5 % strain to validate the Prony series parameters fitting stress relaxation behavior.</div><div>Orbital fat exhibited viscoelastic behavior under dynamic shear with a 0.5 % linear viscoelastic strain limit. Storage modulus <span><math><mrow><msup><mi>G</mi><mo>′</mo></msup></mrow></math></span> averaged 737 ± 310 Pa, and loss modulus <span><math><mrow><msup><mi>G</mi><mo>″</mo></msup></mrow></math></span> averaged 197 ± 76 Pa. Values were similar for strain and frequency sweep testing. At rupture, shear stress averaged 617 ± 366 Pa and rupture strain averaged 200 ± 70 %. The long-term relaxation modulus averaged 646 ± 264 Pa at 100 s. Frequency sweep testing validated the parameters of the Prony series fitted to the experimental stress relaxation data.</div><div>Human orbital fat is linearly viscoelastic within a range typical of biological materials, and exhibits similar viscoelastic behavior for strain and frequency sweep testing. Stress relaxation data for human orbital fat has been parameterized for constitutive models that can be implemented in finite element analysis.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"177 ","pages":"Article 112416"},"PeriodicalIF":2.4,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142695370","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

Differential T2* changes in tibialis anterior and soleus: Influence of exercise type and perceived exertion 胫骨前肌和比目鱼肌的不同 T2* 变化：运动类型和感觉用力的影响。

IF 2.4 3区医学

Journal of biomechanics Pub Date : 2024-11-19 DOI: 10.1016/j.jbiomech.2024.112437

Shuhei Shibukawa , Daisuke Yoshimaru , Yoshinori Hiyama , Takuya Ozawa , Keisuke Usui , Masami Goto , Hajime Sakamoto , Shinsuke Kyogoku , Hiroyuki Daida

{"title":"Differential T2* changes in tibialis anterior and soleus: Influence of exercise type and perceived exertion","authors":"Shuhei Shibukawa , Daisuke Yoshimaru , Yoshinori Hiyama , Takuya Ozawa , Keisuke Usui , Masami Goto , Hajime Sakamoto , Shinsuke Kyogoku , Hiroyuki Daida","doi":"10.1016/j.jbiomech.2024.112437","DOIUrl":"10.1016/j.jbiomech.2024.112437","url":null,"abstract":"<div><div>Understanding muscle response to exercise is critical for optimizing training strategies. This study investigated the effects of dorsiflexion and plantar flexion exercises on T2* values in the tibialis anterior (TA) and soleus (SOL) muscles and explored their relationship with muscle cross-sectional area (MCA), strength, and perceived exertion. Forty participants were divided into two exercise protocols: 30 performed dorsiflexion, 16 performed plantar flexion, and 6 completed both. T2* values were measured pre-and post-exercise using a 1.5 T MRI scanner. MCA and muscle strength were assessed via MRI and a dynamometer, while perceived exertion was measured using the Borg scale.</div><div>Results showed that TA T2* values significantly increased after dorsiflexion (9.04 ± 4.21 ms), peaking 600 s post-exercise, whereas SOL T2* changes during plantar flexion were minimal (1.29 ± 1.05 ms). A significant correlation (r = 0.41, p = 0.026) was observed between T2* changes and Borg scale scores during dorsiflexion, but not with muscle strength (r = 0.08) or MCA (r = 0.35). No significant correlations were found for the SOL during plantar flexion. General linear model analysis showed a significant main effect of dorsiflexion on T2* values (p < 0.0001) and perceived exertion within the dorsiflexion protocol (p = 0.044).</div><div>These findings suggest that dorsiflexion induces greater metabolic disturbances in the TA compared to plantar flexion. The results emphasize the importance of exercise-specific approaches for assessing muscle function and highlight the role of perceived exertion in evaluating muscle response.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"177 ","pages":"Article 112437"},"PeriodicalIF":2.4,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142695356","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

Effects of knee joint position on the triceps Suræ torque-size relationship during plantarflexion in healthy young adults 膝关节位置对健康年轻人跖屈时肱三头肌 Suræ 扭矩大小关系的影响。

IF 2.4 3区医学

Journal of biomechanics Pub Date : 2024-11-19 DOI: 10.1016/j.jbiomech.2024.112436

Bálint Kovács , Gu Yaodong , István Kóbor , József Tihanyi , Tibor Hortobágyi , Gyula Gyebnár

{"title":"Effects of knee joint position on the triceps Suræ torque-size relationship during plantarflexion in healthy young adults","authors":"Bálint Kovács , Gu Yaodong , István Kóbor , József Tihanyi , Tibor Hortobágyi , Gyula Gyebnár","doi":"10.1016/j.jbiomech.2024.112436","DOIUrl":"10.1016/j.jbiomech.2024.112436","url":null,"abstract":"<div><div>We determined the effects of knee joint position on the relationship between maximal voluntary contraction (MVC) isometric plantar flexor torque and architectural properties of the plantar flexors measured at rest in healthy young adults. We obtained 3-D reconstructed muscle architecture data of the right plantar flexor muscles of nine physically active males using T1 and DTI MRI sequences with the knee in ∼5° flexion and at rest. Muscle volume, fascicle length, pennation angle, and physiological cross-sectional area were estimated for the medial and lateral gastrocnemius and the soleus muscle. MVC isometric plantar flexor torque was assessed on a dynamometer with the knee flexed and extended. MVC isometric plantar flexor torque was 59 % lower when performed with the knee flexed (93.1 ± 22.3 N∙m) vs. extended (154.4 ± 37.8 N∙m). Medial (r = 0.70, p = 0.026) and lateral gastrocnemius (r = 0.49, p = 0.048), total soleus (r = 0.79, p = 0.01), and total triceps suræ muscle volume (r = 0.77, p = 0.012) correlated with MVC isometric plantarflexion torque produced with the knee extended. However, only total soleus (r = 0.64, p = 0.028) and triceps suræ volume (r = 0.64, p = 0.031) correlated with MVC isometric plantar flexor torque produced with the knee flexed. Only the total soleus (r = 0.66, p = 0.038) and triceps suræ physiological cross-sectional area (r = 0.55, p = 0.049) correlated with MVC isometric plantar flexor torque performed with knee extended. The data suggest that knee joint position affects torque-size relationship in the gastrocnemius muscles. Additionally, it appears that the total soleus and triceps suræ muscle volumes association with MVC isometric plantar flexor torque is larger than the total physiological cross-sectional area of the triceps suræ. In conclusion, the data suggest that knee joint position affects torque-size relationship in the gastrocnemii but not in the soleus muscle.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"177 ","pages":"Article 112436"},"PeriodicalIF":2.4,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142692965","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

Société de Biomécanique young investigator award 2023: Estimation of intersegmental load at L5-S1 during lifting/lowering tasks using force plate free markerless motion capture 生物力学协会 2023 年青年研究员奖：使用无标记运动捕捉力板估算L5-S1在上举/下放任务中的节间负荷。

IF 2.4 3区医学

Journal of biomechanics Pub Date : 2024-11-17 DOI: 10.1016/j.jbiomech.2024.112422

Jindong Jiang , Wafa Skalli , Ali Siadat , Laurent Gajny

{"title":"Société de Biomécanique young investigator award 2023: Estimation of intersegmental load at L5-S1 during lifting/lowering tasks using force plate free markerless motion capture","authors":"Jindong Jiang , Wafa Skalli , Ali Siadat , Laurent Gajny","doi":"10.1016/j.jbiomech.2024.112422","DOIUrl":"10.1016/j.jbiomech.2024.112422","url":null,"abstract":"<div><div>Accurate estimation of joint load during a lifting/lowering task could provide a better understanding of the pathogenesis and development of musculoskeletal disorders. In particular, the values of the net force and moment at the L5-S1 joint could be an important criterion to identify the unsafe lifting/lowering tasks. In this study, the joint load at L5-S1 was estimated from the motion kinematics acquired using a multi-view markerless motion capture system without force plate. The 3D human pose estimation was first obtained on each frame using deep learning. The kinematic analysis was then performed to calculate the velocity and acceleration information of each segment. Then, the net force and moment at the L5-S1 joint were calculated using inverse dynamics with a top-down approach. This estimate was compared to a reference with a bottom-up approach. It was computed using a marker-based motion capture system combined with force plates and using personalized body segment inertial parameters derived from a 3D model of the human body shape constructed for each subject using biplanar radiographs. The average differences of the estimates for force and moment among all subjects were 14.0 ± 6.9 N and 9.0 ± 2.3 Nm, respectively. Meanwhile, the mean peak value differences of the estimates were 10.8 ± 8.9 N and 11.9 ± 9.5 Nm, respectively. This study then proposed the most rigorous comparison of mechanical loading on the lumbar spine using computer vision. Further work is needed to perform such an estimation under realistic industrial conditions.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"177 ","pages":"Article 112422"},"PeriodicalIF":2.4,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142695377","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

Data should be made as simple as possible but not simpler: The method chosen for dimensionality reduction and its parameters can affect the clustering of runners based on their kinematics 数据应尽可能简单，但不能更简单：所选择的降维方法及其参数会影响根据运动学对跑步者进行分组。

IF 2.4 3区医学

Journal of biomechanics Pub Date : 2024-11-15 DOI: 10.1016/j.jbiomech.2024.112433

Adrian R Rivadulla , Xi Chen , Dario Cazzola , Grant Trewartha , Ezio Preatoni

{"title":"Data should be made as simple as possible but not simpler: The method chosen for dimensionality reduction and its parameters can affect the clustering of runners based on their kinematics","authors":"Adrian R Rivadulla , Xi Chen , Dario Cazzola , Grant Trewartha , Ezio Preatoni","doi":"10.1016/j.jbiomech.2024.112433","DOIUrl":"10.1016/j.jbiomech.2024.112433","url":null,"abstract":"<div><div>Dimensionality reduction is a critical step for the efficacy and efficiency of clustering analysis. Despite the multiple available methods, biomechanists have often defaulted to Principal Component Analysis (PCA). We evaluated two PCA- and one autoencoder-based dimensionality reduction methods for their data compression and reconstruction capability, assessed their effect on the output of clustering runners’ based on kinematics, and discussed their implications for the biomechanical assessment of running technique. Eighty-four participants completed a 4-minute run at 12 km/h while trunk and lower-limb kinematics were collected. Data reconstruction quality was assessed for Direct PCA (PCA directly on original variables) and Fourier PCA (modelling time series as Fourier series and then applying PCA) using popular variance explained criteria; and a feedforward autoencoder (AE). Agglomerative hierarchical clustering was then applied and the agreement between the resulting partitions was assessed. Meaningful errors in the reconstructed signals were found when applying popular variance explained criteria, suggesting reconstruction error should be assessed to make a more informed decision about how many components to retain for further analysis. Direct PCA, Fourier PCA and AE yielded different clusters, warranting caution when comparing outcomes from studies that use different dimensionality reduction techniques: each method may be sensitive to different data features. Direct PCA retaining 99 % of the original variance emerged as the best compromise of data compression, reconstruction quality and cluster separability in our dataset. We encourage biomechanists to experiment with diverse dimensionality reduction methods to optimise clustering outcomes and enhance the real-world applicability of their findings.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"177 ","pages":"Article 112433"},"PeriodicalIF":2.4,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142687083","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

Peak hip external rotation torque and single-rater reliability is influenced by measurement position in the ISOMED2000 髋关节外旋峰值扭矩和单人评分可靠性受 ISOMED2000 测量位置的影响。

IF 2.4 3区医学

Journal of biomechanics Pub Date : 2024-11-15 DOI: 10.1016/j.jbiomech.2024.112430

Christina Frese , Tobias Siebert , Dieter Bubeck , Iris Astner , Daniel Sitte , Wilfried Alt

{"title":"Peak hip external rotation torque and single-rater reliability is influenced by measurement position in the ISOMED2000","authors":"Christina Frese , Tobias Siebert , Dieter Bubeck , Iris Astner , Daniel Sitte , Wilfried Alt","doi":"10.1016/j.jbiomech.2024.112430","DOIUrl":"10.1016/j.jbiomech.2024.112430","url":null,"abstract":"<div><div>Measurement of hip external rotation strength (ERS) is important for preventive and rehabilitative purposes. ERS can be measured in 3 different positions in the isokinetic dynamometer ISOMED2000. However, it is not clear whether these measurement positions effect ERS nor if these positions are reliable in the ISOMED2000. Hence, the purpose of this study was to compare ERS in these positions, the reliability and the agreement. A cross-sectional design was conducted to compare measurement positions and a test–retest design to assess intra-rater reliability and agreement. Twenty-four healthy, physically active athletes participated in the study. Peak isometric torque was measured in the ISOMED in prone, supine, and side-lying position across two sessions on one day. Differences between positions were evaluated with the Wilcoxon-signed-rank test and cliff’s delta. Reliability was assessed via intraclass correlation. Agreement was determined using the standard error of measurement (SEM), minimal detectable change (MDC), and Bland-Altman analysis (BAA). Results indicated a significant influence of measurement position on ERS (p < 0.001) with high effect sizes (>0.74). Reliability and agreement were high in all positions, but highest for the side-lying position (ICC = 0.90 [0.78, 0.96]; SEM = 0.08; MDC = 0.23; BAA_bias = 3.4 %, BAA_loA = 37 %). There were only poor to moderate correlations between measurement positions. These findings suggest that measurement position significantly affects ERS. Furthermore, the effect varies across individuals indicating that normative values cannot be used interchangeably or be adapted across positions. In diagnostic testing ERS should be measured in the same position, but preferably in the side-lying position.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"177 ","pages":"Article 112430"},"PeriodicalIF":2.4,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142692966","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

Myofascial force transmission between latissimus dorsi and contralateral gluteus maximus in runners: a cross-sectional study 跑步者背阔肌与对侧臀大肌之间的肌筋膜力量传递：横断面研究

IF 2.4 3区医学

Journal of biomechanics Pub Date : 2024-11-15 DOI: 10.1016/j.jbiomech.2024.112431

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

{"title":"Myofascial force transmission between latissimus dorsi and contralateral gluteus maximus in runners: a cross-sectional study","authors":"Paola Figueiredo Caldeira , Renan Alves Resende , Bárbara Junqueira Murta , Robert Schleip , Paula Renata Soares Procópio , Priscila Albuquerque Araújo , Sérgio Teixeira Fonseca , Juliana Melo Ocarino","doi":"10.1016/j.jbiomech.2024.112431","DOIUrl":"10.1016/j.jbiomech.2024.112431","url":null,"abstract":"<div><div>The anatomical connection between latissimus dorsi (LD), thoracolumbar fascia, and contralateral gluteus maximus (GM) enables myofascial force transmission (MFT) between the shoulder, trunk, and hip. This study investigates whether regular sports practice, specifically running, influences this MFT pathway. Given the potential changes in tissue stiffness from sports practice and the importance of this property for MFT, we hypothesize that runners may exhibit greater MFT between the LD and GM, resulting in altered passive properties of the lumbar and hip regions during LD contraction. This study aimed to investigate whether runners present a higher modification in lumbar stiffness and passive properties of the contralateral hip due to LD contraction than sedentary individuals. The lumbar stiffness, hip resting position, passive hip torque, and stiffness of fifty-four individuals were assessed using an indentometer and an isokinetic dynamometer, respectively, in two conditions: LD relaxed, and LD contracted. The main and interaction effects were assessed using a two-way ANOVA. The LD contraction increased lumbar stiffness (p < 0.001; η<sub>p</sub><sup>2</sup> = 0.50), externally rotated the hip resting position and increased the passive hip torque and stiffness (p < 0.05; η<sub>p</sub><sup>2</sup> > 0.1) in both groups. In addition, runners presented higher lumbar stiffness compared to sedentary in the LD contracted condition (p = 0.017, ES<sub>d</sub> = 0.54). Although runners exhibited increased lumbar stiffness during LD contraction, the MFT from the shoulder to the hip joint occurred similarly in both groups.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"177 ","pages":"Article 112431"},"PeriodicalIF":2.4,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142655410","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 lower extremity muscle coordination over a 30-minute walk do not differ by muscle fatigability 30 分钟步行过程中下肢肌肉协调性的变化不因肌肉疲劳程度而异

IF 2.4 3区医学

Journal of biomechanics Pub Date : 2024-11-15 DOI: 10.1016/j.jbiomech.2024.112434

Jocelyn F. Hafer , Sarah A. Roelker , Katherine A. Boyer

{"title":"Changes in lower extremity muscle coordination over a 30-minute walk do not differ by muscle fatigability","authors":"Jocelyn F. Hafer , Sarah A. Roelker , Katherine A. Boyer","doi":"10.1016/j.jbiomech.2024.112434","DOIUrl":"10.1016/j.jbiomech.2024.112434","url":null,"abstract":"<div><div>Muscle fatigue, the transient decrease in muscle power, leads to low levels of physical activity and an inability to perform activities of daily living. Altered muscle coordination in response to fatigue may contribute to impaired physical performance. We sought to determine whether lower extremity muscle coordination during gait changes differently depending on susceptibility to fatigue (i.e., fatigability). Thirty-one older adults completed muscle power testing before and after a 30-min walk, with the change in power used to categorize participants as more or less fatigable. We used non-negative matrix factorization to identify muscle modules from electromyography (EMG) from the 2nd minute as our measure of baseline muscle coordination. Changes in muscle coordination were determined by computing the <em>variance</em> in the 30th minute’s EMG <em>accounted for</em> by the baseline modules across all muscles (tVAF) and in individual muscles (mVAF). We compared tVAF between the 2nd and 30th minutes of the walk in individuals who were more and less fatigable. We used mVAF to explore the contribution of changes in individual muscle activity to tVAF. There was a decrease in tVAF overall in response to the walk (p < 0.001; 92.3 ± 1.6 % vs. 89.0 ± 4.3 %) but this did not differ between groups (interaction p = 0.66). There were significant associations between mVAF and tVAF for knee extensor, knee flexor, and ankle dorsiflexor muscles. Our results suggest that muscle coordination changes over the course of a walk in older adults but that this change does not differ between more and less fatigable older adults.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"177 ","pages":"Article 112434"},"PeriodicalIF":2.4,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142655409","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

Patient-specific, multiscale modelling of neointimal hyperplasia in lower-limb vein grafts using readily available clinical data 利用现成的临床数据，建立下肢静脉移植物新内膜增生的患者特异性多尺度模型。

IF 2.4 3区医学

Journal of biomechanics Pub Date : 2024-11-13 DOI: 10.1016/j.jbiomech.2024.112428

Federica Ninno , Claudio Chiastra , Francesca Donadoni , Alan Dardik , David Strosberg , Edouard Aboian , Janice Tsui , Stavroula Balabani , Vanessa Díaz-Zuccarini

{"title":"Patient-specific, multiscale modelling of neointimal hyperplasia in lower-limb vein grafts using readily available clinical data","authors":"Federica Ninno , Claudio Chiastra , Francesca Donadoni , Alan Dardik , David Strosberg , Edouard Aboian , Janice Tsui , Stavroula Balabani , Vanessa Díaz-Zuccarini","doi":"10.1016/j.jbiomech.2024.112428","DOIUrl":"10.1016/j.jbiomech.2024.112428","url":null,"abstract":"<div><div>The prediction of neointimal hyperplasia (NIH) growth, leading to vein graft failure in lower-limb peripheral arterial disease (PAD), is hindered by the multifactorial and multiscale mechanobiological mechanisms underlying the vascular remodelling process. Multiscale <em>in silico</em> models, linking patients’ hemodynamics to NIH pathobiological mechanisms, can serve as a clinical support tool to monitor disease progression. Here, we propose a new computational pipeline for simulating NIH growth, carefully balancing model complexity/inclusion of mechanisms and readily available clinical data, and we use it to predict NIH growth for an entire vein graft. To this end, three different fittings to published <em>in vitro</em> data of time-averaged wall shear stress (TAWSS) vs nitric oxide (NO) production were tested for predicting long-term graft response (10-month follow-up) on a single patient. Additionally, the sensitivity of the model’s predictions to different inflow boundary conditions (BCs) was assessed. The main findings indicate that: (i) a TAWSS-NO hyperbolic relationship best predicts long-term graft response; (ii) the model is insensitive to the inflow BCs if the waveform shape and the systolic acceleration time are comparable with the one acquired at the same time as the computed-tomography scan. This proof-of-concept study demonstrates the potential of using multiscale, computational techniques to predict NIH growth in lower-limb vein grafts, considering the routine clinical scenario of non-standardised data collection and sparse, incomplete datasets.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"177 ","pages":"Article 112428"},"PeriodicalIF":2.4,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142675892","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}

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