Evidence of a myogenic response in vasomotor control of forearm and palm cutaneous microcirculations

S. Durand, R. Zhang, J. Cui, T. E. Wilson, C. G. Crandall

Research output: Contribution to journalArticle

17 Scopus citations

Abstract

Previous investigations of autoregulatory mechanisms in the control of skin blood flow suffer from the possibility of interfering effects of the autonomic nervous system. To address this question, in 11 subjects cutaneous vascular responses were measured during acute changes in perfusion pressure (using Valsalva maneuver; VM) before and after ganglionic blockade via systemic trimethaphan infusion. Cutaneous vascular conductance at baseline (CVC base) and during the last 5 s of the VM (CVCVM) were measured from forearm (nonglabrous) and palm (glabrous) skin. During the VM without ganglionic blockade, compared with CVCbase, CVCVM decreased significantly at the palm [0.79 ± 0.17 to 0.55 ± 0.17 arbitrary units (AU)/mmHg; P = 0.002] but was unchanged at the forearm (0.13 ± 0.02 to 0.16 ± 0.02 AU/mmHg; P = 0.50). After ganglionic blockade, VM induced pronounced decreases in perfusion pressure, which resulted in significant increases in CVCVM at both forearm (0.19 ± 0.03 to 0.31 ± 0.07 AU/mmHg; P = 0.008) and palm (1.84 ± 0.29 to 2.76 ± 0.63 AU/mmHg; P = 0.003) sites. These results suggest that, devoid of autonomic control, both glabrous and nonglabrous skin are capable of exhibiting vasomotor autoregulation during pronounced reductions in perfusion pressure.

Original languageEnglish (US)
Pages (from-to)535-539
Number of pages5
JournalJournal of applied physiology
Volume97
Issue number2
DOIs
StatePublished - Aug 1 2004

Keywords

  • Autoregulation
  • Skin blood flow
  • Valsalva maneuver

ASJC Scopus subject areas

  • Physiology
  • Physiology (medical)

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