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Updated: Jun 22, 2026

Assessment of Neuromuscular Function Using Percutaneous Electrical Nerve Stimulation
Published on: September 13, 2015
The effect of chemoreceptor stimulation upon muscle sympathetic nerve activity
Gregory J Gates1, Matthew N Bartels, John A Downey
1Department of Rehabilitation Medicine, Columbia University College of Physicians and Surgeons, New York, NY 10032, USA. Ggates@montefiore.org
Abstract:
The aim of this investigation was to quantify the combined peripheral and central chemoreceptor contribution to sympathetic outflow above (post) and below (pre) the chemoreceptor ventilatory threshold (CVT). We measured muscle sympathetic nerve activity (MSNA) in seven subjects during hypoxic/hypercapnic and room air rebreathe protocols. Comparisons were made using a repeated measures analysis of variance with two within subject factors. One factor contained three levels--hyperventilation, pre-CVT, and post-CVT. The other factor contained two levels--rebreathe and control. Total MSNA increased from hyperventilation to pre-CVT to post-CVT in the rebreathe trial (385.7+/-95.9, 592.4+/-155.7, 882.0+/-235.4 au/15s respectively) and remained constant in the control trial (433.0+/-189.3, 409.1+/-183.4, 406.1+/-161.4 au/15s respectively). Ventilation increased in the rebreathe trial only. Heart rate and blood pressure did not change in either trial. These data suggest that the chemoreceptors significantly contribute to the modulation of sympathetic outflow.
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