Robbins et al. [7] reported that motor level stimulation has to be far above threshold for attainment of muscle contraction related to proprioception feedback in skin, muscles, and joints; and that sensory-level stimulation has to affect the afferent fibers of skin with no muscle contraction. Gravelle et al. [19] reported that sensory-level stimulation of a lower threshold stimulates skin or proprioceptors to increase skin or proprioception to increase standing posture stability. Dickstein et al. [20] reported that use of TENS led to an increase in somatosensory flow from the lower extremity