International Biomechanics最新文献

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

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

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

Fatigue behavior of three thin CAD/CAM all-ceramic crown materials. 三种薄型 CAD/CAM 全瓷牙冠材料的疲劳行为。

International Biomechanics Pub Date : 2023-12-01 Epub Date: 2024-01-11 DOI: 10.1080/23335432.2024.2303121

Khaled Bataineh, Mohammad Al Janaideh

{"title":"Fatigue behavior of three thin CAD/CAM all-ceramic crown materials.","authors":"Khaled Bataineh, Mohammad Al Janaideh","doi":"10.1080/23335432.2024.2303121","DOIUrl":"10.1080/23335432.2024.2303121","url":null,"abstract":"The purpose of this study was to study the effect of crown thickness on the fatigue life of CAD/CAM ceramic materials. CAD/CAM ceramic materials for the crown were virtually designed with three thickness designs of (a) ultra-thin occlusal crown average 0.7 mm thick (group A), (b) thin occlusal crown 1.1 mm average thick (group B), (c) thick occlusal crown 1.5 mm thick. The materials are: zirconia Cercon ZC and IPS e.max CAD (LD). Finite Element Analysis (FEA) simulations were carried out to estimate the fatigue lives of restorative materials. The lives for groups B and C under fatigue load were not significantly different from each other for Zirconia. The predicted lives for group A zirconia crowns, under fatigue load 50 N, 100 N, 120 N is 24 years, 4.3 years, 1.9 years, respectively. Results for crowns made of LD can be summarized as follows: under load 50 N, all groups have survived longer than 5 respectively, while under the load of 100 N, only group C survived longer than 5 years. 0.7 mm thick full contour Zirconia crowns possessed adequate endurance strength to survive under physiologic conditions. On the other hand, the crown made of LD should have at least 1.5 mm thickness to survive longer than 5 years.","PeriodicalId":52124,"journal":{"name":"International Biomechanics","volume":"10 1","pages":"1-8"},"PeriodicalIF":0.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10786422/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139418495","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

Use of adult anthropometric tables to estimate children body segment inertial parameters. 使用成人人体测量表估计儿童身体部分的惯性参数。

International Biomechanics Pub Date : 2023-12-01 Epub Date: 2023-11-28 DOI: 10.1080/23335432.2023.2268686

Sabrina Otmani, Guilhem Michon, Bruno Watier

{"title":"Use of adult anthropometric tables to estimate children body segment inertial parameters.","authors":"Sabrina Otmani, Guilhem Michon, Bruno Watier","doi":"10.1080/23335432.2023.2268686","DOIUrl":"10.1080/23335432.2023.2268686","url":null,"abstract":"There is a lack of knowledge in the literature concerning Body Segment Inertial Parameters (BSIP) for children aged 4 to 15 years. Nevertheless, these data are fundamental for studying the dynamics of the healthy and pathological musculoskeletal system. One common method for obtaining BSIP is to use regression equations derived from anthropometric tables. However, the majority of these equations are based on adult data. In this study, we compared certain BSIP (segment mass, center of mass position, and transverse moment of inertia) derived from adult anthropometric tables with the corresponding BSIP extracted from a pediatric anthropometric table. The goal of this study was to determine the accuracy of using adult anthropometric tables to calculate pediatric BSIP. For this comparison, we assessed the proximity of several adult anthropometric tables to a pediatric anthropometric table by Jensen (1986) for each BSIP. Our results revealed differences between the BSIP obtained using adult tables and the BSIP obtained with the pediatric table used as a reference. When considering all the tables, the mean relative difference was 12% for segment mass, 12% for center of mass position, and 25% for transverse moment of inertia. Notably, the greatest relative differences were observed for the head, hand, and foot segments. Additionally, the relative difference in female data was higher compared to males. This result could be attributed to the predominant use of male subjects in the adult tables considered in this study. Finally, the adult anthropometric tables by Dumas and Wojtsuch (2018) and De Leva (1996) provided results that were closer in comparison to Jensen (1986).","PeriodicalId":52124,"journal":{"name":"International Biomechanics","volume":"10 1","pages":"18-28"},"PeriodicalIF":0.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11072689/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138447058","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

Biomechanical testing of different fixation techniques for intraoperative proximal femur fractures: a technical note. 术中股骨近端骨折不同固定技术的生物力学测试:技术说明。

International Biomechanics Pub Date : 2022-12-01 DOI: 10.1080/23335432.2022.2142159

Toni Wendler, Benjamin Fischer, Alexander Brand, Martin Weidling, Johannes Fakler, Dirk Zajonz, Georg Osterhoff

{"title":"Biomechanical testing of different fixation techniques for intraoperative proximal femur fractures: a technical note.","authors":"Toni Wendler, Benjamin Fischer, Alexander Brand, Martin Weidling, Johannes Fakler, Dirk Zajonz, Georg Osterhoff","doi":"10.1080/23335432.2022.2142159","DOIUrl":"https://doi.org/10.1080/23335432.2022.2142159","url":null,"abstract":"Intraoperative proximal femoral fractures (IPFF) represent a rare but challenging complication of total hip arthroplasties. They usually occur as a longitudinal split. This pilot trial aimed to compare the biomechanical primary stability of different fixation techniques for IPFF. Standardised longitudinal medial split fractures of the proximal femur (type II, Modified Mallory Classification) were created in artificial osteoporotic and non-osteoporotic composite femora after implantation of a cementless femoral stem. Five different fixation techniques were compared: cerclage band, cerclage wiring with one or two wires, and lag screw fixation with one or two lag screws. A quasi-static loading protocol was applied and failure loads were evaluated. The observed median failure loads were 4192N (3982N - 5189N) for one cerclage band, 4450N (3577N - 4927N) for one cerclage wire, 5016N (4175N - 5685N) for two cerclage wires, 6085N (5000N - 8907N) for one lag screw, and 4774N (4509N - 8502N) for two lag screws. Due to the wide range of failure loads within the experimental groups, there were no observable differences between the groups. All fixation techniques provided sufficient primary stability in osteoporotic and non-osteoporotic composite bones. Further cadaveric studies with larger sample sizes may be needed to confirm the results presented here.","PeriodicalId":52124,"journal":{"name":"International Biomechanics","volume":" ","pages":"27-32"},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9683064/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40697106","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

Effects of whole body vibration on bone properties in growing rats. 全身振动对生长大鼠骨特性的影响。

International Biomechanics Pub Date : 2022-12-01 DOI: 10.1080/23335432.2022.2142666

Akira Minematsu, Yasue Nishii

{"title":"Effects of whole body vibration on bone properties in growing rats.","authors":"Akira Minematsu, Yasue Nishii","doi":"10.1080/23335432.2022.2142666","DOIUrl":"https://doi.org/10.1080/23335432.2022.2142666","url":null,"abstract":"This study aimed to examine the continuous effects of whole body vibration (WBV) on bone properties, in growing rats. Fifty 5-week-old male rats were divided into control and experimental groups. Each experimental group underwent WBV at 50 Hz (0.5 g, 15 min/day, 5 days/week) for 5 or 10 weeks. Bone size, muscle weight and bone mechanical strength of the right tibia were measured. Trabecular bone microstructure, cortical bone geometry and bone mass of the left tibia were analyzed by micro-CT. Serum levels of bone formation/resorption markers were also measured. In rats that underwent 5-week WBV, tibial cortical bone mineral content and cortical bone area significantly increased (p < 0.05), and tibial cortical bone volume, thickness, maximum load, break point and stiffness tended to be increased (p = 0.05-0.09), compared with control rats. In rats that underwent 10-week WBV, stiffness tended to be increased (p = 0.07), and the serum level of osteocalcin decreased, compared with control rats. These findings suggest that 5-week WBV had beneficial effects on bone properties, and that increased bone mineral content and cortical bone geometry may lead to higher bone mechanical strength. Further studies will be needed to determine the optimal conditions of WBV for improving bone properties in the growth stage.","PeriodicalId":52124,"journal":{"name":"International Biomechanics","volume":" ","pages":"19-26"},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9677996/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40491066","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

Ex vivo study correlating the stiffness of the ovine patellar tendon to age and weight. 离体研究羊髌骨肌腱僵硬度与年龄和体重的关系。

International Biomechanics Pub Date : 2022-12-01 DOI: 10.1080/23335432.2022.2108899

Françoise Kayser, Edoardo Bori, Sophie Fourny, Fanny Hontoir, Peter Clegg, Alexandra Dugdale, Jean-Michel Vandeweerd, Bernardo Innocenti

{"title":"Ex vivo study correlating the stiffness of the ovine patellar tendon to age and weight.","authors":"Françoise Kayser, Edoardo Bori, Sophie Fourny, Fanny Hontoir, Peter Clegg, Alexandra Dugdale, Jean-Michel Vandeweerd, Bernardo Innocenti","doi":"10.1080/23335432.2022.2108899","DOIUrl":"10.1080/23335432.2022.2108899","url":null,"abstract":"Tendons play a crucial role in the musculoskeletal system. In humans, tendon injuries, especially chronic tendinopathy, are very common and the patellar tendon is a frequent location for tendinopathy or injuries. The biomechanical characteristics of the patellar tendon, such as elasticity and stiffness, are of paramount importance and constitute major outcome measures in research studies. We aimed to assess whether the stiffness of the healthy ovine patellar tendon changes with age and weight in a population of normal animals. Sixty-eight 'patella-patellar tendon-tibial tuberosity' units from thirty-four Ile-de-France ewes of body mass 65 to 95 kg, euthanized for reasons other than musculoskeletal diseases, underwent a tensile test providing a measure of the tendon stiffness. Animals were sorted into three categories of age (1-2 yo, 3-5 yo, 6-10 yo). We found a positive but not significant correlation between age category and stiffness (r = 0.22, p = 0.27). There was a significantly positive correlation between weight and stiffness (r = 0.39, p = 0.04). In conclusion, the study characterized biomechanical properties of healthy tendons, provided useful reference values, and established the basis for future biomechanical tests on healing tendons in sheep. The most appropriate sheep population for those future studies would be non-overweight young adults presenting with no lameness.","PeriodicalId":52124,"journal":{"name":"International Biomechanics","volume":"9 1","pages":"1-9"},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9359184/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9460420","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