手指等長收縮經動作習慣化之力量變異性研究

Movement Habituation Associated with Force Variability during Finger Isometric Contraction

蔣懷孝(Huai-Hsiao Chiang)

《習慣領域期刊》 1卷1期 (2009/11) Pp. 67-78

摘要

Most motor control studies emphasized force production on two different aspects: 1. how fast was force produced or rate of force development, or 2. variability of force. According to speed-accuracy trade-off theory, high variability was observed during rapid force output and numerous studies had carried out in the literatures of motor control. During the decrement of force, variability associated with habitual domains were used to elaborate the bio-system in terms of degree of freedom. As a result, the variability of human behaviors were suggested to change as a function of habituation via repetitive practice to reduce errors and to enhance the stability of skill.
This study analyzed force variability of finger isometric force production. 29 college studesnts were asked to produce different levels of force, rates of force development and contraction times. 40 trials were performed in each block of task. The dependent variable was the variability of force trace, the absolute mean error of force trace. Three independent variables were different significantly, timing F (2, 56)=169.69, P＜.000, force (1, 28)= 206.78, P＜.000, and habituation F (1, 28)=97.04, P＜.001. Force error reveled higher on both ramp and decrement of force than that of static phase. A U-shape relationship was found in three force phases. The control of force revealed less variability when force remained constantly. After practicing three times a week for four weeks, the variability of force traces reduced as a function of movement habituation. To conclude, force variability was associated with the phases of force production and the consistency of finger force control improved after movement habituation.

關鍵字

手指 ； 力量變化率 ； 習慣化 ； 力量變異性 ； 動作學習

並列摘要

Most motor control studies emphasized force production on two different aspects: 1. how fast was force produced or rate of force development, or 2. variability of force. According to speed-accuracy trade-off theory, high variability was observed during rapid force output and numerous studies had carried out in the literatures of motor control. During the decrement of force, variability associated with habitual domains were used to elaborate the bio-system in terms of degree of freedom. As a result, the variability of human behaviors were suggested to change as a function of habituation via repetitive practice to reduce errors and to enhance the stability of skill.
This study analyzed force variability of finger isometric force production. 29 college studesnts were asked to produce different levels of force, rates of force development and contraction times. 40 trials were performed in each block of task. The dependent variable was the variability of force trace, the absolute mean error of force trace. Three independent variables were different significantly, timing F (2, 56)=169.69, P＜.000, force (1, 28)= 206.78, P＜.000, and habituation F (1, 28)=97.04, P＜.001. Force error reveled higher on both ramp and decrement of force than that of static phase. A U-shape relationship was found in three force phases. The control of force revealed less variability when force remained constantly. After practicing three times a week for four weeks, the variability of force traces reduced as a function of movement habituation. To conclude, force variability was associated with the phases of force production and the consistency of finger force control improved after movement habituation.

並列關鍵字

finger ； rate of force development ； movement habituation ； force variability ； motor learning