Streamer Jill E, Queen Robin M
Department of Biomedical Engineering and Mechanics, Virginia Tech, 495 Old Turner Street, Blacksburg, VA 24060, 300 Norris Hall, USA.
Department of Biomedical Engineering and Mechanics, Virginia Tech, 495 Old Turner Street, Blacksburg, VA 24060, 300 Norris Hall, USA; Department of Orthopaedic Surgery, Virginia Tech - Carilion School of Medicine, Roanoke, VA, USA.
Hum Mov Sci. 2024 Dec;98:103289. doi: 10.1016/j.humov.2024.103289. Epub 2024 Sep 20.
Movement variability describes an individual's capacity to repeatedly perform motor skills and provides better understanding of coordination during a task. The purpose of this research was to assess the impact that task type and sex assigned at birth have on movement variability and load symmetry in healthy younger adults. It was hypothesized that the between trial variability of peak impact force and average loading rate would not differ between sexes or between tasks (level walking, stair ascent, stair descent, and sit-to-stand) and that load symmetry would not differ between the four tasks for an individual participant using a level of significance of α = 0.05. Peak impact force (PIF) and average loading rate (ALR) were measured during level walking, stair ascent and descent, and sit-to-stand using loadsol® sensors collecting at 200 Hz (Novel Electronics, Pittsburg, PA, USA). Coefficients of variation (CV) and the Absolute Symmetry Index (ASI) were used to assess symmetry and movement variability. Between the 39 female and 33 male young adults that participated in this study, significant differences (p < 0.001) were observed between groups for mass, height, and limb length. PIF did not show an interaction between sex and task (p = 0.627) or between sexes (p = 0.685) but did show between-task differences (p < 0.001). The PIF ASI also showed a difference between tasks (p < 0.001). Tukey's post hoc testing showed that the PIF ASI differences between the sit-to-stand task and the other tasks were clinically meaningful (d > 0.8). The ALR did not show an interaction between sex and task (p = 0.069) or between sexes (p = 0.624) but did show between-task differences (p < 0.001). Tukey's showed that the ALR was different between tasks and was clinically meaningful (d > 0.8) except between level walking and stair ascent (p = 0.546). The ALR ASI showed a different between tasks (p < 0.001). Tukey's showed that the ALR ASI differences between tasks were all clinically meaningful (d > 0.8) except between level walking and stair ascent (p = 0.220).These findings suggest that the movement variability for all loading metrics that existed between tasks could be due to difference in motor control and the width of the base of support needed to complete the various tasks. For example, the joint coordination to complete a sit-to-stand task is different than what is needed during walking, stair ascent and stair descent. Understanding variability observed between daily tasks helps identify movement patterns that could be potential risk factors for injury.
运动变异性描述了个体重复执行运动技能的能力，并有助于更好地理解任务执行过程中的协调性。本研究的目的是评估任务类型和出生时指定的性别对健康年轻成年人运动变异性和负荷对称性的影响。研究假设，峰值冲击力和平均负荷率的试验间变异性在性别之间或任务（平地行走、上楼梯、下楼梯和从坐到站）之间不会有差异，并且对于个体参与者，在α = 0.05的显著性水平下，四个任务之间的负荷对称性不会有差异。使用以200Hz采集数据的Loadsol®传感器（美国宾夕法尼亚州匹兹堡的Novel Electronics公司），在平地行走、上楼梯和下楼梯以及从坐到站的过程中测量峰值冲击力（PIF）和平均负荷率（ALR）。变异系数（CV）和绝对对称指数（ASI）用于评估对称性和运动变异性。在参与本研究的39名年轻女性和33名年轻男性中，观察到两组在体重、身高和肢体长度方面存在显著差异（p < 0.001）。PIF在性别与任务之间（p = 0.627）或性别之间（p = 0.685）未显示出交互作用，但在任务之间确实存在差异（p < 0.001）。PIF ASI在任务之间也存在差异（p < 0.001）。Tukey事后检验表明，从坐到站任务与其他任务之间的PIF ASI差异具有临床意义（d > 0.8）。ALR在性别与任务之间（p = 0.069）或性别之间（p = 0.624）未显示出交互作用，但在任务之间确实存在差异（p < 0.001）。Tukey检验表明，除了平地行走和上楼梯之间（p = 0.546），ALR在任务之间存在差异且具有临床意义（d > 0.8）。ALR ASI在任务之间存在差异（p < 0.001）。Tukey检验表明，除了平地行走和上楼梯之间（p = 0.220），任务之间的ALR ASI差异均具有临床意义（d > 0.8）。这些发现表明，任务之间存在的所有负荷指标的运动变异性可能是由于运动控制的差异以及完成各种任务所需的支撑面宽度不同所致。例如，完成从坐到站任务的关节协调性与行走、上楼梯和下楼梯时所需的关节协调性不同。了解日常任务之间观察到的变异性有助于识别可能成为受伤潜在风险因素的运动模式。
