本研究目的在測定連續暴露於機車把手振動者的末梢循環與感覺機能，期以評估機車振動引起之機能障礙. 10位無職業振動暴露的測試者(年齡20.5±1.5歲;騎機車年資2.5±0.9年)，在夏天( 31.5±0.6℃ )及冬天( 19.6±0.6℃ )連續暴露於機車振動1、2及4小時，然後冷浸10分鐘，分別測定冷浸前後的右手指皮膚溫、中指振動覺闈值、手脣兩點艦別覺及環指指甲壓試驗。結果發現在夏天4小時連續暴露後之食指皮膚溫有降低而振動覺闈值顯善增加；在冬天暴露於機車振動後的末梢循環與感覺機能有顯著地變化－－食指皮膚溫下降，而振動覺闈值、兩點鑑別覺及指甲壓恢復時間等顯著上升。顯示連續暴露於機車把手振動會引起末梢循環及感覺機能的障礙。 The peripheral circulatory and sensory functions were measured on 10 testers to evaluate the disturbances of these functions induced by hand-ram vibration of motorcycles. The average age and year of riding motorcycles of the testers who had never exposed to occupational vibration were 20.5 ± 1.5 and 2.5 ± 0.9 respectively. The measured items included the skin temperature of the index finger, vibratory sense threshold of the middle finger, two-point discriminat. nd nail press test of the ring finger of the right hand. After continously exposing to hand-arm vibration of motorcycle for 1, 2, and 4 hours, each measurement was undertaken before and after 10 minutes local cooling of the right hand in summer (31.5 ± 0.6℃) and winter (19.6 ± 0.6℃). The results showed that the skin temperature slightly reduced and vibratory sense threshold remarkably increased in summer. The peripheral circulatory and sensory functions were significantly changed in winter--the skin tempertaure decreased ; while vibratory sense threshold, two-point discrimination, and the time of recovery of nad press test remarkably increased. It was found that the disturbances of the peripheral circulatory and sensory functions were caused by continously exposing to hand-arm vibration of motorcycle handle-bars.