The effect of wrist posture on attenuation of vibration in the hand-arm system

Eight Male University students served as subjects in this experiment. Subjects were required to perform a simulated riveting task in three wrist postures (neutral, 1/3 maximum flexion, 2/3 maximum wrist flexion) while vibration was measured at the hand-handle interface and the styloid process of the ulna. Results indicated that wrist posture had a significant effect on vibration transmitted from the hand-handle interface to the wrist. The neutral wrist posture, in the majority of the cases, was associated with the highest degree of dampening. Decrements in vibration amplitude from the hand-handle interface to the wrist were as a high as 88.89%.