8[1]Hagood S, Solomonow M, Baratta R, et al. The effect of joint velocity on the contribution of the antagonist musculature to knee stiffness and laxity[J] . Am J Sports Med, 1990,18(2):182-187.
9[2]Gerdle B, Karlsson, A G, Crenshaw, A G, et al. The relationships between EMG and muscle morphology throughout sustained static knee extension at two submaximal force levels[J] . Acta Physiol Scand, 1997,160:341-351.
10[3]Hkkinen K, Alen M, Kallinen M, et al. Muscle CSA, force production, and activation of leg extensors during isometric and dynamic actions in middle-aged and elderly men and women[J] . J of Aging and Physical Activity, 1998,6:232-247.