A three part experiment was designed to examine interactions between local and reflex influences on forearm skin blood flow (SkBF). In part I locally increasing arm skin temperature (T(sk)) to 42.5°C was not associated with increases in underlying muscle blood flow, esophageal temperature (T(es)), or forearm blood flow in the contralateral cool arm. In part II whole body T(sk) was held at 38 or 40°C and the surface temperature of one arm held at 38 or 42°C for prolonged periods. SkBF in the heated arm rose rapidly with the elevation in body Tsk T(sk) and arm T(sk) continued to rise as T(es) rose. SkBF in the arm kept at 32°C paralleled rising T(es) In six studies, SkBF in the cool arm ultimately converged with SkBF in the heated arm. In eight other studies, heated arm SkBF maintained an offset above cool arm SkBF throughout the period of whole body heating. In part III, local arm T(sk) of 42.5°C did not abolish skin vasoconstrictor response to lower body negative pressure. The authors conclude that local and reflex influences to skin interact so as to modify the degree but not the pattern of skin vasomotor response.
ASJC Scopus subject areas
- Physiology (medical)