International Biomechanics最新文献_第2页

Voluntary contractions underestimate peak muscle activity in drop jumps. 自发性收缩低估了跳高时肌肉活动的峰值。

International Biomechanics Pub Date : 2025-12-01 Epub Date: 2025-06-09 DOI: 10.1080/23335432.2025.2518343

David Alan Phillips, Skylar Paletta, Michael Perlet

{"title":"Voluntary contractions underestimate peak muscle activity in drop jumps.","authors":"David Alan Phillips, Skylar Paletta, Michael Perlet","doi":"10.1080/23335432.2025.2518343","DOIUrl":"10.1080/23335432.2025.2518343","url":null,"abstract":"Maximal voluntary isometric contractions (MVIC) are a common method to normalize electromyographic amplitude into standardized units of %MVIC. However, in 60% of drop jump research using an MVIC in 2018-2023, supramaximal activation or activation greater than 100% MVIC occurred. Therefore, MVICs may not be representative of peak muscle activation, leading to erroneous interpretation of muscle activation. The purpose of this study is to quantify EMG normalization difference in drop jump landings. Sixteen (10 M, 6F) participants were recruited for the study. MVICs were recorded from nine lower extremity muscles and this activation compared to the maximal activation recorded from 10 drop jump trials. The MVIC significantly underestimated maximum activation by 71%-140% in one-sample t-tests, for the rectus femoris (p = 0.002), vastus medialis (p < 0.001), medial gastrocnemius (p = 0.002), lateral gastrocnemius (p = 0.002), tibialis anterior (p = 0.02), and gluteus maximus (p = 0.03). The one-sample t-tests were not statistically significant for the remaining muscles with the data containing significant variability. Our data quantifies EMG normalization underestimate and supports the status in the literature where normalization with MVICs will underestimate maximal muscle activation in drop jump movements.","PeriodicalId":52124,"journal":{"name":"International Biomechanics","volume":"12 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12152988/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144259400","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Assessing single camera markerless motion capture with OpenSim inverse kinematics during upper limb activities of daily living. 利用OpenSim反运动学评估上肢日常生活活动中的单摄像头无标记运动捕捉。

International Biomechanics Pub Date : 2025-12-01 Epub Date: 2025-09-05 DOI: 10.1080/23335432.2025.2556187

Bradley Scott, Mhairi McInnes, Edward K Chadwick, Dimitra Blana

{"title":"Assessing single camera markerless motion capture with OpenSim inverse kinematics during upper limb activities of daily living.","authors":"Bradley Scott, Mhairi McInnes, Edward K Chadwick, Dimitra Blana","doi":"10.1080/23335432.2025.2556187","DOIUrl":"10.1080/23335432.2025.2556187","url":null,"abstract":"This study evaluates the accuracy of single camera markerless motion capture (SCMoCap) using Microsoft's Azure Kinect, enhanced with inverse kinematics (IK) via OpenSim, for upper limb movement analysis. Twelve healthy adults performed ten upper-limb tasks, recorded simultaneously by OptiTrack (marker-based) and Azure Kinect (markerless) from frontal and sagittal views. Joint angles were calculated using two methods: (1) direct kinematics based on body coordinate frames and (2) inverse kinematics using OpenSim's IK tool with anatomical keypoints. Accuracy was evaluated using root mean square error (RMSE) and Bland-Altman analysis. Results indicated that the IK method slightly improved joint angle agreement with OptiTrack for simpler movements, with an average RMSE of 8° for shoulder elevation in the sagittal plane compared to 9° with the coordinate frame method. However, both methods had higher RMSEs for rotational measurements, with IK and coordinate frame methods at 21° for shoulder rotation in the sagittal plane. Forearm pronation-supination measurements were unreliable due to tracking limitations. These findings suggest that Kinect with IK improves accuracy for simpler movements but struggles with rotational joint mechanics. Future research should focus on enhancing markerless tracking algorithms to fully realise the benefits of IK.","PeriodicalId":52124,"journal":{"name":"International Biomechanics","volume":"12 1","pages":"1-13"},"PeriodicalIF":0.0,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12416023/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145001965","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Stochastic resonance stimulation effect on stability during walking in people with Parkinson disease. 随机共振刺激对帕金森病患者行走稳定性的影响。

International Biomechanics Pub Date : 2025-12-01 Epub Date: 2025-11-06 DOI: 10.1080/23335432.2025.2584665

Eman Alsaqabi, Stephen DiBianca, Ashwini Sansare, Khushboo Verma, Hendrik Reimann, John Jeka

{"title":"Stochastic resonance stimulation effect on stability during walking in people with Parkinson disease.","authors":"Eman Alsaqabi, Stephen DiBianca, Ashwini Sansare, Khushboo Verma, Hendrik Reimann, John Jeka","doi":"10.1080/23335432.2025.2584665","DOIUrl":"10.1080/23335432.2025.2584665","url":null,"abstract":"People with Parkinson disease (PwPD) often face challenges with maintaining balance while walking, which can stem from sensory dysfunction. Studies have identified different biomechanical strategies that aid in preserving upright balance control. Stochastic resonance (SR) stimulation delivers sub-threshold electrical noise to enhance the detection capabilities of dysfunctional sensory systems. Yet, the effectiveness of SR in enhancing gait stability in PwPD is undetermined. The purpose of this study was to investigate the effects of SR on balance control during visually perturbed walking in PwPD (NCT06829342).Fourteen individuals with PD completed the study. We established individualized sensory thresholds for SR stimulation and identified the optimal SR intensity. Following this, the participants walked within a virtually perturbed environment. Center of mass (CoM) excursion, foot placement, and ankle roll responses were assessed bilaterally.Peak CoM excursion showed a significant increase, indicating reduced stability, with the SR condition compared to no-SR at the more affected side. Outcome measures related to balance control mechanisms were insignificant.With SR, PwPD were driven by the induced fall with more sway and without significant alterations in balance strategies, which might be due to adding more noise to sensory processing and misidentifying the more affected side.","PeriodicalId":52124,"journal":{"name":"International Biomechanics","volume":"12 1","pages":"81-94"},"PeriodicalIF":0.0,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12599153/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145453624","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Profile of para athletes and characterization of sports injuries during the 2023 Paralympic School Games. 2023年残奥学校运动会残奥运动员概况和运动损伤特征。

International Biomechanics Pub Date : 2025-12-01 Epub Date: 2025-07-16 DOI: 10.1080/23335432.2025.2531944

Ana Flávia Medeiros Ribeiro, Renato de Souza Melo, Daniela Cristina Rodrigues Carvalho, Juliana Fernandes, Saulo Fernandes Melo de Oliveira, Rafaella de Andrade Monteiro, Andressa da Silva de Mello, Caroline de Cássia Batista de Souza, Maria Julia de Lyra Cardoso, Maria Das Graças Rodrigues de Araújo, Ana Paula de Lima Ferreira

{"title":"Profile of para athletes and characterization of sports injuries during the 2023 Paralympic School Games.","authors":"Ana Flávia Medeiros Ribeiro, Renato de Souza Melo, Daniela Cristina Rodrigues Carvalho, Juliana Fernandes, Saulo Fernandes Melo de Oliveira, Rafaella de Andrade Monteiro, Andressa da Silva de Mello, Caroline de Cássia Batista de Souza, Maria Julia de Lyra Cardoso, Maria Das Graças Rodrigues de Araújo, Ana Paula de Lima Ferreira","doi":"10.1080/23335432.2025.2531944","DOIUrl":"10.1080/23335432.2025.2531944","url":null,"abstract":"This article explores the characterization of sports injuries among young athletes participating in the 2023 Paralympic School Games. Injuries during the physiological growth phase can not only compromise the development of sports skills but also harm the physical development expected for their age group. Adaptive mechanisms to training are the main determinants of the location of injuries, traumas and musculoskeletal complaints. This paper aimed to identify occurrence of sports injuries in para athletes during the 2023 School Paralympics. The study population consisted of students who participated in the national stage of the 2023 School Paralympics, held at the Paralympic Training Center in the state of São Paulo. The sample consisted of 640 para-athletes, 253 (60.5%) females and 387 (60.5%) males, with an average age of 14.06 years. Overall, 14.9% of the participants reported injuries/illness. The team with the highest percentage of injured members was from the state of Tocantins (14.8%). Most of the injured athletes had intellectual disabilities (41.46%), practiced athletics (56.9%) and were in the final years of elementary school (21.95%), with an average age of 14.56 years, and the majority were male (56.86%).","PeriodicalId":52124,"journal":{"name":"International Biomechanics","volume":"12 1","pages":"7-17"},"PeriodicalIF":0.0,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12269049/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144651177","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Correction. 修正。

International Biomechanics Pub Date : 2025-12-01 Epub Date: 2025-10-23 DOI: 10.1080/23335432.2025.2576271

引用次数: 0

Accelerometer-based daily physical activity monitoring in patients with postpartum sacroiliac joint dysfunction: a case-control study. 基于加速度计的产后骶髂关节功能障碍患者日常体力活动监测：一项病例对照研究。

International Biomechanics Pub Date : 2024-12-01 Epub Date: 2024-09-07 DOI: 10.1080/23335432.2024.2396277

Sem M M Hermans, Jasper Most, Martijn G M Schotanus, Henk van Santbrink, Inez Curfs, Wouter L W van Hemert

{"title":"Accelerometer-based daily physical activity monitoring in patients with postpartum sacroiliac joint dysfunction: a case-control study.","authors":"Sem M M Hermans, Jasper Most, Martijn G M Schotanus, Henk van Santbrink, Inez Curfs, Wouter L W van Hemert","doi":"10.1080/23335432.2024.2396277","DOIUrl":"10.1080/23335432.2024.2396277","url":null,"abstract":"Patients with low back pain caused by sacroiliac joint (SIJ) dysfunction have an impaired quality of life, due to reported pain, disability and activity limitations. There is increasing evidence that minimally invasive sacroiliac joint fusion (MISJF) results in improvement in pain, disability and quality of life in these patients. Some studies have reported improvements in daily physical activity following MISJF but based on bias-prone self-reports. Our aim was to provide objective data on daily physical activity in patients with SIJ dysfunction. Daily physical activity in daily life of participants was measured using a triaxial accelerometer for seven consecutive days, before surgery and 3 months after surgery. Recorded daily activities were the daily number of events and total time spent sitting or lying, standing, walking, cycling, high-activity and number of steps and sit-to-stand transfers. The quality of life was assessed by the validated Dutch EQ-5D-5 L-questionnaire. No statistical differences were observed between daily physical activity in patients with SIJ dysfunction before and 3 months after MISJF. As compared to matched controls, high-intensity physical activity was lower in both the pre- and postoperative period (p = 0.007) for patients with SIJ dysfunction. The quality of life improved significantly in patients after MSIJF, from 0.418 to 0.797 (p = 0.021) but did not reach the level of controls (1.000). Daily physical activity in patients with postpartum SIJ dysfunction does not improve 3 months following MISJF, while quality of life does improve significantly. The discrepancy between these two observations is food for new research.","PeriodicalId":52124,"journal":{"name":"International Biomechanics","volume":"11 1","pages":"6-11"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11382714/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142146860","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Correction. 修正。

International Biomechanics Pub Date : 2024-12-01 Epub Date: 2025-10-10 DOI: 10.1080/23335432.2025.2569220

引用次数: 0

External handheld loads affect scapular elevation and upward rotation during shoulder elevation tasks. 在肩部抬高任务中，外部手持负荷会影响肩胛骨的抬高和上旋。

International Biomechanics Pub Date : 2024-12-01 Epub Date: 2024-03-19 DOI: 10.1080/23335432.2024.2332212

Alan Eldridge, Everett Lohman, Skulpan Asavasopon, Lida Gharibvand, Lori Michener

{"title":"External handheld loads affect scapular elevation and upward rotation during shoulder elevation tasks.","authors":"Alan Eldridge, Everett Lohman, Skulpan Asavasopon, Lida Gharibvand, Lori Michener","doi":"10.1080/23335432.2024.2332212","DOIUrl":"10.1080/23335432.2024.2332212","url":null,"abstract":"Altered scapular kinematics is associated with shoulder pain. Resistance exercise is a common treatment; however, the effects of lifting an external load on scapular kinematics is limited. Understanding whether an external handheld load affects scapular kinematics in a healthy population can provide normal values utilized for comparison to individuals with shoulder pain. Currently, no studies have examined the effect of incrementally increased handheld loads. We defined the effects of varying external handheld loads on scapular kinematics during a shoulder elevation task. Healthy participants (n = 50) elevated their shoulder in the scapular plane over 4 trials. One trial of no loading (control) and 3 trials with incrementally increased external handheld loads. Scapular kinematic rotations and translations were measured during ascent and descent phases using 3D motion capture. Compared to no load, the highest external load during ascent increased scapular elevation [mean difference = 3.2 degrees (95%CI: 0.9, 5.4), p = 0.006], and during descent increased scapular elevation [mean difference = 3.9 degrees (95%CI: 2.8, 5.1), p < 0.001] and increased scapular upward rotation [mean difference = 4.5 degrees (95%CI: 2.4, 6.6), p < 0.001]. External handheld loads result in small increases in scapular elevation and scapular upward rotation. These results should be utilized as normal values to compare to individuals with shoulder pain.","PeriodicalId":52124,"journal":{"name":"International Biomechanics","volume":"11 1","pages":"1-8"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10953777/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140159563","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Is larger eccentric utilization ratio associated with poorer rate of force development in squat jump? An exploratory study 较大的偏心利用率是否与较差的深蹲跳力量发展速度有关？一项探索性研究

International Biomechanics Pub Date : 2024-04-13 DOI: 10.1080/23335432.2024.2341634

Ž. Kozinc, Darjan Smajla, N. Šarabon

引用次数: 0

Quantifying muscle contraction with a conductive electroactive polymer sensor: introduction to a novel surface mechanomyography device. 利用导电电活性聚合物传感器量化肌肉收缩：新型表面机械力学成像设备简介。

International Biomechanics Pub Date : 2023-12-01 Epub Date: 2024-02-28 DOI: 10.1080/23335432.2024.2319068

Donna Moxley Scarborough, Shannon E Linderman, Ryan Aspenleiter, Eric M Berkson

引用次数: 0