Static exercise-induced increase in blood pressure in individuals with cervical spinal cord injury

Citation
M. Yamamoto et al., Static exercise-induced increase in blood pressure in individuals with cervical spinal cord injury, ARCH PHYS M, 80(3), 1999, pp. 288-293
Citations number
30
Categorie Soggetti
Ortopedics, Rehabilitation & Sport Medicine
Journal title
ARCHIVES OF PHYSICAL MEDICINE AND REHABILITATION
ISSN journal
00039993 → ACNP
Volume
80
Issue
3
Year of publication
1999
Pages
288 - 293
Database
ISI
SICI code
0003-9993(199903)80:3<288:SEIIBP>2.0.ZU;2-Z
Abstract
Objective: To compare the presser response to static exercise in subjects w ith cervical spinal cord injury (SCI) at the C6 to C8 level with that in ab le-bodied control subjects. In these SCI subjects, the descending supraspin al sympathetic neurons and afferent pathways from the contracting muscles t o peripheral vessels via the medullary cardiovascular center are damaged. Design: Mean arterial blood pressure, heart rate, and plasma concentrations of norepinephrine, epinephrine, renin activity, vasopressin, aldosterone, and human atrial natriuretic peptide were measured during a 2-minute period of sustained contraction of elbow flexor group muscle in 7 SCI subjects an d 7 age-marched able-bodied control subjects. Results: Static exercise resulted in a significant increase in mean blood p ressure (p < .05) in both SCI subjects (preexercise, 74.7 +/- 2.2 mmHg; sta tic exercise, 81.9 +/- 4.1 mmHg) and control subjects (pre-exercise, 101.0 +/- 4.2 mmHg; static exercise, 117.0 +/- 4.9 mmHg). In SCI subjects, there was no change in heart rate during exercise, whereas in control subjects he art rate increased during exercise (p < .05) (pre-exercise, 68.7 +/- 3.8 be ats/min; static exercise, 76.0 +/- 3.1 beats/min). There were no significan t changes in the hormone levels in the SCI subjects throughout the experime nt. Conclusion: The significant increase in mean blood pressure observed in the present study indicates the presence of peripheral control from muscle rec eptors and evoked presser response during static exercise in SCI subjects. (C) 1999 by the American Congress of Rehabilitation Medicine and the Americ an Academy of Physical Medicine and Rehabilitation.