Effects of Syringe Size and Hand Condition on Thumb Loading and Muscle Activity during Pipetting Tasks

注射作業之針筒尺寸與手部狀況對大拇指負荷與肌肉活動之影響

林彥輝(Yen-Hui Lin) ； 陳志勇(Chih-Yong Chen)

《工業工程學刊》 26卷6期 (2009/11) Pp. 493-498

https://doi.org/10.29977/JCIIE.200911.0007

摘要

在實驗室中利用針筒進行液體的注射是很常見的作業，這些作業因需長時間執行重複性的動作，而導致工作人員經常抱怨上肢疲勞與不適。本研究利用肌電圖與捏力計探討注射作業時之大拇指負荷與肌肉活動情形。實驗記錄拇指外展短肌(abductor pollicis brevis)、拇指短伸肌(extensor pollicis brevis)與拇指長屈肌(flexor pollicis longus)之肌肉電位均方根值變化情形。研究結果顯示，作業人員在執行注射作業後，平均捏力顯著減少20.9%，女性之最大捏力平均減少31.5%，遠高於男性之減少值(14.8%)。使用大尺寸的針筒在大拇指負荷與肌肉活動情形上有顯著不良影響，但手部有無配戴手套、以及配戴手套與針筒尺寸間並無交互作用存在。研究結論指出，針筒尺寸顯著影響大拇指負荷與肌肉活動。

關鍵字

針筒尺寸 ； 注射作業 ； 肌肉活動 ； 肌電圖

並列摘要

Plunger operated syringes are typically used by laboratory staff to dispense precise quantities of liquid. Such workers commonly complain of discomfort in the upper extremities as a result of prolonged repetitive actions over the course of their workday. A pipetting task was designed to quantify thumb loading and muscle activity measured by pinch strength and surface electromyography (EMG). The root mean square (RMS) EMG was recorded for the abductor pollicis brevis, extensor pollicis brevis and flexor pollicis longus. Analytical results indicate that pinch strength decreased significantly by 20.9% after pipetting tasks. Females had higher reduction rates in maximum pinch force (31.5%) than males (14.8%). User of a large syringe had negative significant effects on thumb loading and muscle activities; however, no statistically significant difference existed between hand conditions, and no interactive effects existed between syringe size and hand condition. We conclude that syringe size influences applied thumb force and muscle activity.

並列關鍵字

syringe size ； pipetting task ； muscle activity ； electromyography

參考文獻

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