演奏樂器是人類最複雜且細微的動作之一，演奏樂器時，時常繁複的使用手部的肌肉，在肌肉持續疲勞的情況下，容易累積傷害，若是沒有相當的休息或復健，對音樂家的演奏生命甚至日常生活皆會有嚴重的影響，此病症為Playing-related musculoskeletal disorders (PRMD)，可視為是音樂家特有的職業傷害，與MSDs類似，PRMD並不會造成生命危險，但仍然會讓人產生不適或不便。各種樂器發生PRMD的機率不同，其中吉他、鋼琴以及其他弦樂器的發生率最高，本研究將選用電子吉他作為研究對象，以訪談與文獻獲得改良電吉他的方針，並以肌電儀評估肌肉活動量，最後以改善左手腕(橈側屈腕肌)患病率較高的部位，實驗結果改良後的電吉他雖然沒有顯著降低左手腕(橈側屈腕肌)的iEMG值，但降低了右手腕(橈側屈腕肌)以及右手肘(肱三頭肌)的iEMG值，並且發現iEMG值與患病率有高度相關。

Playing music instrument is one of the most complicated and subtle movement. Hand muscles is used rapidly and frequently while playing music instrument. It is very easy to accumulate mischief being under fatigued condition continuously. The career of musician can be threatened if there is no rehabilitation or enough rest. The name of those symptoms called playing-related musculoskeletal disorders (PRMD). It is regarded as the occupational injuries of musician. Just like MDS, there is no life threaten caused by PRMD. But still that cause inconvenience and discomfort. The prevalence of PRMD is different by each music instrument. Guitar, piano and other string instrument are highest. In this research, we picked electric guitar as subject. Gather the redesign factor by interview and reference, and evaluate the exercise level of muscles by EGM. Because of the higher prevalence we chose the muscles of left wrist as our main target. Al though the result shows that there is no significant decreasing of exercise level of left wrist muscles, there is decreasing of exercise level of right wrist and right elbow. This study also discovers that iEMG value is highly relevant with prevalence.

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