Ohtaka Chiaki, Fujiwara Motoko
a Department of Health Sciences , Faculty of Human Life and Environment, Nara Women's University , Nara , Japan.
J Mot Behav. 2019;51(3):331-341. doi: 10.1080/00222895.2018.1474337. Epub 2018 May 29.
We investigated the characteristics for force generation and relaxation using graded isometric contractions of the knee extensors. Participants performed the following tasks as quickly and accurately as possible. For the force generation task, force was increased from 0% to 20%, 40% and 60% of the maximal voluntary force (MVF). For the force relaxation task, force was decreased from 60% to 40%, 20% and 0%. The following parameters of the recorded force were calculated: error, time, and rate of force development. The error was consistently greater for force relaxation than generation. Reaction and adjustment times were independent of the tasks. The control strategy was markedly different for force relaxation and generation, this tendency was particularly evident for the lower limb compared to the upper limb.
我们使用膝关节伸肌的分级等长收缩来研究力量产生和放松的特征。参与者尽可能快速且准确地执行以下任务。在力量产生任务中，力量从最大自主力量（MVF）的0%增加到20%、40%和60%。在力量放松任务中，力量从60%降低到40%、20%和0%。计算记录力量的以下参数：误差、时间和力量发展速率。力量放松时的误差始终大于力量产生时的误差。反应时间和调整时间与任务无关。力量放松和产生的控制策略明显不同，与上肢相比，这种趋势在下肢尤为明显。
