Abstract

The aim of this study was to investigate the motor control strategies adopted when performing two jumping tasks with different task demands when analysed at an individual and group level. Twenty-two healthy individuals performed two jumping tasks: jumping without the use of an arm swing (CMJnas) and jumping starting in a plantar flexed position with the use of an arm swing (PF). Principal component analysis (PCA) was performed using hip, knee and ankle joint moment data on individual (PCAi) and group data (PCAc). The results demonstrate that a greater number of PCs are required to explain the majority of variance within the dataset in the PF condition at both an individual and group level, compared to CMJnas condition. Although common control strategies were observed between the two jumping conditions, differences in the organisation of the movement (PC loading coefficients) were observed. Results from the group analysis did not completely reflect the individual strategies used to perform each jumping task and highlight the value in performing individual analysis to determine emergent control strategies.

摘要

本研究的目的是调查在个人和团体层面进行分析时，在执行具有不同任务需求的两项跳跃任务时所采用的运动控制策略。22 名健康人执行了两项跳跃任务：不使用手臂摆动 (CMJnas) 跳跃和使用手臂摆动 (PF) 在足底弯曲位置开始跳跃。使用个人 (PCAi) 和组数据 (PCAc) 的髋、膝和踝关节力矩数据进行主成分分析 (PCA)。结果表明，与 CMJnas 条件相比，需要更多数量的 PC 来解释 PF 条件在个人和组级别的数据集中的大部分差异。尽管在两种跳跃条件之间观察到了共同的控制策略，观察到运动组织的差异（PC 负荷系数）。群体分析的结果并没有完全反映用于执行每个跳跃任务的个体策略，也没有突出执行个体分析以确定紧急控制策略的价值。