Dynamic parameters of the wrist

Wrist response has been widely evaluated in order to classify the sources of wrist related disorders, or to evaluate the risk involved on wrist loading activities. These studies have been focused on a qualitative approach of the wrist response. The current study quantifies the wrist response based on a single degree of freedom model. The natural frequency and the damping were estimated from the data gathered during the experiments. The stiffness was calculated based on the model definition. No variation of the damping is related to the loading conditions or muscular activity. Both natural frequency and stiffness increase as muscle activity increases. However, these two model parameters values tend to level off at higher muscle activity levels.