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

¹Institute for Exercise and Environmental Medicine, Presbyterian Hospital of Dallas, Dallas 75231; and ²Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, Texas 75235

Submitted 4 December 2003 ; accepted in final form 8 April 2004

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 (CVC_VM) were measured from forearm (nonglabrous) and palm (glabrous) skin. During the VM without ganglionic blockade, compared with CVC_base, CVC_VM 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 CVC_VM 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.

autoregulation; skin blood flow; Valsalva maneuver

This article has been cited by other articles:

				T. E. Wilson, R. Zhang, B. D. Levine, and C. G. Crandall Dynamic autoregulation of cutaneous circulation: differential control in glabrous versus nonglabrous skin Am J Physiol Heart Circ Physiol, July 1, 2005; 289(1): H385 - H391. [Abstract] [Full Text] [PDF]