Journal of Applied Physiology
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J Appl Physiol 88: 957-965, 2000;
8750-7587/00 $5.00
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Vol. 88, Issue 3, 957-965, March 2000

Carotid baroreflex control of heart rate and blood pressure during ES leg cycling in paraplegics

Jacqui Raymond1, Glen M. Davis1, Martinus N. van der Plas3, Herbert Groeller2, and Scott Simcox1

1 Rehabilitation Research Centre, University of Sydney, Lidcombe, New South Wales 2141; 2 Department of Biomedical Science, University of Wollongong, Wollongong, New South Wales 2522, Australia; and 3 Faculty of Human Movement Sciences, Vrije University, 1081 BT Amsterdam, The Netherlands

This study investigated control of heart rate (HR) and mean arterial pressure (MAP) at rest and during electrical stimulation (ES) leg cycling exercise (LCE) in paraplegics (Para). Seven men with complete spinal lesions (T5-T11) and six able-bodied (AB) men participated in this study. Beat-to-beat changes in HR and MAP were recorded during carotid sinus perturbation. Carotid baroreflex function curves were derived at rest and during ES-LCE for Para and during voluntary cycling (Vol) for AB. From rest to ES-LCE, oxygen uptake (VO2) increased (by 0.43 l/min) and HR rose (by 11 beats/min), yet MAP remained unchanged. In AB, Vol increased VO2 (by 0.53 l/min), HR (by 22 beats/min), and MAP (by 8 mmHg). ES-LCE did not alter the carotid sinus pressure (CSP)-MAP relationship, but it displaced the CSP-HR relationship upward relative to rest. No rightward shift was observed during ES-LCE. Vol by AB produced an upward and rightward displacement of the CSP-MAP and CSP-HR relationships relative to rest. These findings suggested that the carotid sinus baroreflex was not reset during ES-LCE in Para.

spinal cord injury; cardiovascular control; hemodynamic; functional electrical stimulation


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