Comparison of Effects of Pincer- and Scissor-pinching Modes of Chopstick Operation on Shoulder and Forearm Muscle Activationduring a Simulated Eating Task

Abstract

Purpose] This study investigated the best training method for chopsticks manipulation through a comparison of muscle activations of the shoulder and forearm between pincer-pinching and scissor-pinching operations.[Subjects] Thirteen participants were recruited. [Methods] They performed simulated eating tasks using two different chopstick operations. The EMG activities of the right side upper trapezius, flexor and extensor carpi radialis were measured.[Results] Electromyographic activity of the upper trapezius muscles was significantly lower in scissor-pinching than in pincer-pinching. The activity of the flexor carpi radialis muscle was significantly higher in scissor-pinching than in pincer-pinching. [Conclusion] We consider that persons with fine-motor impairment of the hands would be able to use chopsticks more effectively if the chopsticks operation were properly selected.