The relationship between the kinematics of passive movement, the stretch of extensor muscles of the leg and the change induced in the gain of the soleus H reflex in humans.

摘要: The gain of the H reflex attenuates during passive stepping and pedalling movements leg. We hypothesized that kinematics movement indirectly reflect receptor origin this attenuation. In first experiment, reflexes were evoked in soleus at 26 points cycle slow, leg 13 with static (the ankle was always immobilized). Maximum inhibition occurred as moved through its most flexed position (P < 0.05). Inhibition observed also strongest increase gradual flexion movement, rapid reversal extension. second length stretch vasti muscles modelled. Variable pedal crank lengths revolutions per minute (rpm) altered joint displacements angular velocities. Equivalent rates vasti, achieved different combinations velocities, elicited equivalent attenuations mean magnitudes Reflex exponentially related to rate (R2 = 0.98 P 0.01). results imply attenuation spinal sensorimotor path arises from spindle discharge heteronymous extensor knee and/or hip, concomitant movement.