振動刺激對女性使用非動力手工具之上肢肌肉疲勞恢復評估

螺絲起子是家庭和工廠中的必備工具，儘管電動螺絲起子普及的提高了操作效率，但卻無法完全取代傳統螺絲起子。而操作手工具若長時間、重複性動作或姿勢不良，可能導致肌肉骨骼傷害，對此有研究表明振動可能有助於肌肉力量、強度和骨頭密度的改善，常應用於康復和運動訓練中。本研究招募到8名女性（22±0.44歲），旨在探討不同振動頻率（無振動、20赫茲、33赫茲、50赫茲）和握持方式（力握方式、捏握方式）對女性在操作非動力螺絲起子進行螺絲鎖附卸除作業後的上肢肌肉影響，評估局部振動刺激是否能改善肌肉疲勞和痠痛程度，以及是否能提升手部肌肉施力情形。研究發現50赫茲的局部振動顯著提升作業效率（p=0.026）；20赫茲和50赫茲振動頻率可以使指伸肌主觀疲勞指數減少0.37、0.5，而肱橈肌下降0.75、0.75。振動刺激能有效恢復上肢肌力、提高握力值、增進工作效率並降低主觀疲勞程度。因此，作業人員在重複性非動力手工具作業後，若搭配適當振動刺激，應可減少肌肉骨骼傷害風險。

A screwdriver is an essential tool in both households and factories. While electric screwdrivers have increased operational efficiency, they cannot completely replace traditional screwdrivers. Prolonged use of hand tools with repetitive motions or improper posture can lead to musculoskeletal injuries. Studies indicate that vibration may improve muscle strength, endurance, and bone density, commonly used in rehabilitation and sports training.This study recruited eight female participants (22±0.44 years) to investigate the effects of different vibration frequencies (no vibration, 20 Hz, 33 Hz, 50 Hz) and grip types (power grip, pinch grip) on upper limb muscles after performing screwing and unscrewing tasks with a non-powered screwdriver. The study aimed to assess whether localized vibration stimulation can alleviate muscle fatigue and soreness, and enhance hand muscle strength.The findings revealed that 50 Hz vibration significantly improved operational efficiency (p=0.026). Vibration frequencies of 20 Hz and 50 Hz reduced the subjective fatigue index of the extensor digitorum by 0.37 and 0.5, respectively, and the brachioradialis muscle by 0.75 for both frequencies. Vibration stimulation effectively restored upper limb muscle strength, increased grip strength, enhanced work efficiency, and reduced subjective fatigue. Therefore, applying appropriate vibration stimulation after repetitive non-powered hand tool operations can reduce the risk of musculoskeletal injuries for workers.