Abstract
Hoffmann<sup>1</sup>originally suggested that the electrically induced stretch reflex in man is a monosynaptic one. Later Lloyd<sup>2</sup>proved in cats that the simple reflex twitch which resulted from muscle nerve stimulation is in fact monosynaptic, and, in 1951, Magladery and others<sup>3</sup>confirmed this observation for the H reflex in man. It soon became evident that even among normal human volunteers there is considerable variation of H reflex amplitude.<sup>4,5</sup>Moreover, the reflex in individual subjects varies spontaneously, as well as with changes in muscle length, tonic contraction, the Jendrassik maneuver, and post-tetanic potentiation (PTP). Attempts to correlate H reflexes with specific pathological conditions have met with limited success.<sup>6-9</sup>The H reflex is absent, or markedly reduced, when the myotatic reflex is itself absent due to a disorder of the reflex arc. An exception to this rule is spinal shock.<sup>10</sup>Significant augmentation of the H
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