Acute hemodynamic responses of spinal cord injured individuals to functional neuromuscular stimulation-induced knee extension exercise

S. F. Figoni, R. M. Glaser, M. M. Rodgers, S. P. Hooker, B. N. Ezenwa, S. R. Collins, T. Mathews, A. G. Suryaprasad, S. C. Gupta

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46 Scopus citations

Abstract

The purpose of this study was to determine and compare acute hemodynamic responses of spinal cord injured (SCI) quadriplegics (quads), and paraplegics (paras) during a graded-intensity knee extension (KE) exercise test utilizing functional neuromuscular stimulation (FNS) of paralyzed quadriceps muscles. Seven quads and seven paras (N=14) performed a series of 4-minute stages of bilateral alternating FNS-KE exercise (approximately zero to 70 degree range of motion at the knee and 6 KE/min/leg) at ankle loads of 0, 5, 10, and 15 kg/leg. Physiologic responses were determined with open-circuit spirometry, impedance cardiography, and auscultation. Comparing rest with peak FNS-KE for both groups combined, FNS-KE exercise elicited significant (p<0.05) increases in oxygen uptake (130 percent), pulmonary ventilation (120 percent), respiratory exchange ratio (37 percent), arteriovenous oxygen difference (57 percent), cardiac output (32 percent), stroke volume (41 percent), mean arterial pressure (18 percent), and rate-pressure product (23 percent). Heart rate increased significantly by 11 percent from the 5- to the 15-kg/leg stages. Physiologic responses of quads and puras were very similar, except for lower (p<0.05) arterial pressures, rate-pressure product, and peripheral vascular

Original languageEnglish (US)
Pages (from-to)9-18
Number of pages10
JournalJournal of Rehabilitation Research and Development
Volume28
Issue number4
DOIs
StatePublished - 1991

ASJC Scopus subject areas

  • Rehabilitation

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    Figoni, S. F., Glaser, R. M., Rodgers, M. M., Hooker, S. P., Ezenwa, B. N., Collins, S. R., Mathews, T., Suryaprasad, A. G., & Gupta, S. C. (1991). Acute hemodynamic responses of spinal cord injured individuals to functional neuromuscular stimulation-induced knee extension exercise. Journal of Rehabilitation Research and Development, 28(4), 9-18. https://doi.org/10.1682/jrrd.1991.10.0009