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Invited Commentary

GE Carvell, PhD, PT, is Associate Professor, Department of Physical Therapy, and Associate Dean of Graduate Studies and Research, School of Health and Rehabilitation Sciences, University of Pittsburgh, Pittsburgh, PA 15260 (gcarvell+@pitt.edu)

This excerpt was created in the absence of an abstract.

The authors have compared 2 devices for evaluating electromyographic (EMG) responses to imposed plantar flexion in 9 subjects with chronic spinal cord injury. "Low" and "high" velocities of movement were chosen. Electromyographic data were obtained from surface electrodes placed over the anterior tibialis and soleus muscles according to the authors' description. Data are presented for the soleus muscle EMG activity only. The authors attempt to separate "reflex" and "nonreflex" components of the "stretch-induced" resistance to passive displacement. It is difficult to justify such a separation because so few muscles were included in the EMG sampling and data are presented for only a single recording site over the soleus muscle.

Figure 1 shows the placement of the hand-held dynamometer on the sole of the foot, a source of significant cutaneous input to hyperactive reflex circuitry within the isolated spinal cord....

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