There are conflicting observations of the effects of fatigue on the sensitivity of large diameter
Ia afferents. Our goal was to characterize any fatigue-related changes in the spinal reflex
pathways during fatigue. Manipulation of the Ia afferent response by vibration and tendon
tap, in which the motor neuron pool is modulated by both short-and long-loop activation from
muscle spindles, were elicited before and after a fatigue task. The fatigue task consisted of
intermittent submaximal and maximal voluntary contractions (MVCs). Percent voluntary …