Forearm blood flow (FBF), sweat rate (SR), and heart rate (HR) were recorded in 4 men during 2 periods of controlled skin temperature (Ts) increase in a Ts range of 34-40°C. Ts, right atrial temperature (Tra), and esophageal temperature (Tes) were recorded continuously. Tra ranged from 36.5 to 38°C. Multiple linear regression analysis for FBF, SR, and HR against Tra, Ts, and rate of change of Ts revealed: SR was virtually independent of steady state Ts influence; FBF could be described by a linear combination of Tra and Ts where the Tra influence above a threshold Tra was more than 20 times the Ts influence; and negative rate of change of Ts showed a significant inhibitory influence on SR and HR but little or no influence on FBF. No positive rate of change of Ts effects were seen. Use of Tes as a measure of internal temperature overestimated the role of Ts in the control of SR, FBF and HR.
ASJC Scopus subject areas
- Physiology (medical)