施行重複最大握力而不會產生疲勞之較合適的採樣時間

Determine the Suitable Duration for Sampling of Consecutive Maximum Voluntary Contraction Gripping Exertions Without Fatigue

黃崢瑋(Chen-Wei Huang)

指導教授 ： 宋鵬程

朝陽科技大學/理工學院/工業工程與管理系/碩士(2010年)

摘要

工業作業中，手部需產生適當的握力以握持物件或安全有效地控制和使用手工具。先前握力相關研究著重於探討徒手或穿戴手套狀況時最大、次大握力或是持續耐久時間，然而並無文獻探討進行持續性握力採樣時，受測者可接受、並且不會產生疲勞的較適合採樣時間。
本研究利用握力計及肌電訊號量測模組，收集10名男性及8名女性，於不同手套類型（徒手與穿戴Neoprene手套箱手套）、及不同休息時間（2分鐘與4分鐘），調查握力值、手部肌群肌電訊號(Electromyography, EMG)及主觀知覺舒適度在施行重複最大握力時之差異，同時探討較適合採樣時間。
結果顯示，最大握力於不同手套類型、不同休息時間及性別之間，都有顯著性的差異。伸腕肌與伸指肌之肌肉活動(%MVC)只有在不同休息時間下有顯著性的差異。依據頻譜與振幅合併分析方法（Joint analysis of EMG spectrum and amplitude,JASA）於4種情況下進行重複握力試驗，都不會有疲勞情況產生，表示遵循Caldwell’s regimen給予受測者2分鐘休息時間是足夠的，但是如給予受測者4分鐘休息時間，採樣期間之平均握力較2分鐘休息時間之平均握力高2.6±0.6 Kg。
有關4種情況(徒手-休息2分鐘、手套-休息2分鐘、徒手-休息4分鐘、手套-休息4分鐘)下持續進行握力採樣時能夠維持80%最大握力的合適採樣時間，研究結果顯示90%男性可接受的採樣時間為17、8、48及38分鐘，同時75%女性可接受的採樣時間分別為47、32、98、及58分鐘。穿戴手套時，合適採樣時間都會縮短。

關鍵字

合適採樣時間 ； 頻譜與振幅合併分析方法 ； 握力 ； 肌電訊號 ； 肌肉活動

並列摘要

For industrial tasks involving manual operations, the workers need to generate sutiable grip strength to hold the object or to safely and effectively control and use the hand tools. Previous studies related to grip strength focused on exploring the maximum and submaximum grip strength or maximum enduration time for gripping exertions for bare and gloved hands. However, no literatures were found investigating suitable duration for sampling of consecutive maximum grip strength without fatigue and at the same time acceptable by the subjects.
This study use grip dynamometer and electromyography (EMG) module to collect EMG signals for four forearm muscles when performing consecutive maximum gripping exertions for bare and gloved hands using two or four minutes rest period between gripping efforts. Ten males and eight females participated in this experiment. The suitable sampling duration will be the time that 90% of males and 75% of females can perform consecutive MVC gripping exertions without fatigue. Borg 10-point scale was also used to measure the discomfort level during the consecutive maximum gripping exertions.
The results show that there were statistically significant differences in maximum grip strength between gloving condition, rest time, and gender. Muscle activities in extensor carpi radialis longus (ECR), extensor digitorum (ED) were also differed significantly between two and four minutes rest period. Based on Joint analysis of EMG spectrum and amplitude (JASA), the subjects can follow the recovery time of 2 minutes of Caldwell’s regimen between consecutive grip exertions for all four gripping conditions without fatigue. However, the average grip strength during the sampling period for 4 minutes rests test are 2.6 ± 0.6 Kg higher than the 2 minutes rest tests.
In this study, the suitable sampling duration is defined as the time that the subject can maintain 80% of the maximum grip strength during consecutive maxumum gripping exertions. For each of the four different gripping conditions (bare hand-2 minutes rest, gloved hand-2 minutes rest, bare hand-4 minutes rest, gloved hand-4 minutes rest), the results show that the suitable sampling duration that 90% of males and 75% of females can perform consecutive MVC gripping exertions without fatigue were 17、8、48、38 minutes and 47、32、98、58 minutes, respectively.

並列關鍵字

Grip Strength ； %MVC ； Suitable sampling duration ； JASA ； EMG

參考文獻

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