The Effect of Simultaneous Grip on Wrist Flexion/Extension Strength

Abstract

This study quantifies the effect of a simultaneous grip on wrist strength. It was hypothesized that wrist flexion strength increases with an increasing grip and wrist extension strength decreases with an increasing grip. Twelve subjects performed maximum wrist flexion and extension exertions with a different level of simultaneous grip – minimum, preferred, and maximum. Wrist flexion strength increased 34% and wrist extension strength decreased 10% from minimum to maximum grip. This shows that measure of wrist strength for assessing strength capabilities or the efficacy of hand surgeries or rehabilitation programs requires control of finger flexor activities to ensure consistent and relevant results. When opening a bottle in an outward direction (right hand thread), wrist extension strength may be significantly limited by a simultaneous grip due to muscle antagonism. When twisting a fragile or uncomfortable object, reduced finger flexor activities can limit wrist flexion strength.