Abstract
Powered tools are widely used in industries and they produce reaction forces that may be associated with upper extremity musculoskeletal disorders. The handle displacement, grip force, and upper limb EMG during impulsive torque reactions due to the effect of operator experience was examined in the study with 15 experienced and 15 novice tool users. The results show that experienced users allowed an average of 7.9° of handle displacement, while novice users allowed 11.5° when pistol grip tools were used on a horizontal surface. Experienced users exerted more grip force than novice users when using right angle tools, but less when using pistol grip tools. Average EMG magnitudes at flexors, extensors, and biceps were greater for experienced users. Recommendations regarding tool selection and workstation design can be derived from the results to minimize physical exposure for both user groups during power tool usage.
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