本研究目的為瞭解目標物放置位置與重量對於老年人在執行取物作業時,上肢與手部相關的運動學、肌電學與伸取績效之變化,並探討性別對執行取物作業的影響。本實驗共邀請16位受試者自願參與實驗,他們的平均年齡71.6(SD = 4.0)歲,男女各半。受試者以慣用手執行伸手取物作業,用超音波三度空間動作分析儀(Zebris CMS-HS/ Zerbris Medical GmbH, Germany)量測手腕伸屈、橈尺偏、手肘曲屈、前臂旋前、肩伸屈與肩內收外展等六項關節活動角度;運動學量測手移動最大速度、最大加速度、最大握徑等;反應時間測定軟體(RT USB COM v2.20)量測伸手取物之動作時間;肌電訊號量測系統(Zebris EMG System, Germany)量測二頭肌、三頭肌、肱橈肌與旋前圓肌等主要肌肉之肌電訊號變化等資料。結果顯示,老年人伸手取物作業時,上肢關節角度受性別與位置影響顯著(p < .05);上肢肌電訊號(%MVC)受重量影響顯著(p < .05);動作時間主要受位置影響顯著(p < .05);本研究結果可提供作為上肢動作訓練與日常生活功能訓練時,提供客觀的復健評估及目標設立之依據與臨床復健醫學與運動學等學術研究之參考。
The study was aimed at elucidating the effects of object location (distance and orientation) and weight on relevant kinematic of upper extremity, electromyography and reach time during a reach-to-grasp task for elderly adults. A total of 16 healthy subjects, 10 males and 6 females eldery were recruited to participate in this study. The averaged age for elderly were 71.4±4.0 years old. The joint range of motion of upper-extremity, peak velocity, peak acceleration, maximum grip aperture and percentage of time occurred were recorded by an ultrasound-based movement analysis system (Zebris CMS-HS/ Zerbris Medical GmbH, Germany). The reach time, reach return and total time were recorded by movement time measurement software (RT USB COM v2.20). The muscle activity of Biceps, Triceps, Brachioradialis and Pronators Teres were measured by electromyography (Zebris EMG System, Germany). The results of this study indicated that gender and object location had significant influence on joint range of motion and muscle activity of upper extremity. For elderly adults, object weight significantly affected muscle activity (%MVC). Object location significantly affected movement time. The findings of this study can provide useful information for clinical training of upper extremity, rehabilitation goal setting or relevant references.