隨著科技的進步，人們的生活與電腦越來越緊密，但隨著使用時間的增加，讓我們的身體開始出現負面影響，如疲勞、痠痛等，其中打字作業就是造成身體負擔的主要來源，而為了減低打字的負擔，目前市面上有許多電腦輔具出現，如鍵盤腕靠及電腦扶手。本研究在有、無使用鍵盤腕靠及電腦扶手的狀況下進行五分鐘的中文打字實驗，使用EMG量測右手伸指肌、橈側伸腕長肌、肱三頭肌時間內之電位，並計算均方根植，判斷不同實驗組合的差異，以及使用主觀問卷了解受測者在不同狀況下的舒適度感受。

實驗結果顯示
1.鍵盤腕靠使用前後，三條肌肉的EMG訊號沒有顯著差異，問卷結果也表示鍵盤腕靠無法提高手臂及手腕的舒適度。
2.電腦扶手可以減低伸指肌3.7%、橈側腕長伸肌8.7%、肱三頭肌36%的EMG電位，問卷結果呈現電腦扶手無法提高手腕舒適度，但可以提高手臂舒適度。

With the advance of science and technology, people’s lives are getting closer to computers. But with the increase in the use of time, our body begins to have negative effects such as fatigue, soreness, etc. typing is the main source of health problems, in order to reduce the burden of typing, many computer assistive device have been developed, such as keyboard wrist rest and computer arm support. This study conducted a five minutes Chinese typing experiment with and without the use of a keyboard wrist rest and computer arm support. Using EMG to measure the electric potential of the right extensor digitorum muscle, extensor carpi radialis longus muscle, triceps brachii muscle, and calculate RMS. To judge the difference of different experimental groups and to use subjective questionnaire to understand the subjects comfort feeling under different conditions.

The results of the experiment showed that
1. There was no significant difference between the EMG signals of the three muscles before and after the keyboard wrist rest were used. The questionnaire results also indicated that the Keyboard wrist rest could not improve the comfort feeling of the arm and wrist.
2. Computer arm support can reduce the extensor digitorum muscle 3.7%, extensor carpi radialis longus muscle 8.7%, triceps brachii muscle 36% of the EMG electric potential. The results showed that Computer arm support did not improve wrist comfort, but increased arm comfort.