Document Detail

Sweat rate vs. forearm blood flow during lower body negative pressure.
MedLine Citation:
PMID:  3997719     Owner:  NLM     Status:  MEDLINE    
Skin blood flow is inhibited when hyperthermia and added hypovolemic stresses are superimposed. We tested the hypothesis that part of this inhibition is a reduced drive for cutaneous active vasodilatation (AVD) with sweat rate (SR) taken as an indirect measure of the efferent drive for cutaneous AVD. We also inquired whether SR itself changes with redistribution of blood volume. Six healthy supine men were subjected to lower body negative pressure (LBNP) after heating in water-perfused suits increased esophageal temperatures (Tes) to a mean of 37.2 degrees C and at least doubled SR and forearm vascular conductance (FVC). Heating continued throughout LBNP and recovery. Sweat rate did not decrease with LBNP onset, although SR-Tes slopes during LBNP were reduced 28% from control. In four subjects the SR-Tes slope did not recover when LBNP was discontinued. These observations suggest that SR is not an effector of the low-pressure baroreflex. In contrast to SR, FVC abruptly fell 22% at the onset of LBNP. Thereafter, FVC-Tes slopes near zero or less occurred. The major effector for FVC inhibition with LBNP appears to be the neural vasoconstrictor system. A minor component due to reduced drive for cutaneous AVD probably occurs as well.
S D Solack; G L Brengelmann; P R Freund
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Journal of applied physiology (Bethesda, Md. : 1985)     Volume:  58     ISSN:  8750-7587     ISO Abbreviation:  J. Appl. Physiol.     Publication Date:  1985 May 
Date Detail:
Created Date:  1985-07-11     Completed Date:  1985-07-11     Revised Date:  2013-09-26    
Medline Journal Info:
Nlm Unique ID:  8502536     Medline TA:  J Appl Physiol (1985)     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1546-52     Citation Subset:  IM; S    
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MeSH Terms
Blood Volume
Forearm / blood supply
Hot Temperature
Lower Body Negative Pressure*
Reflex / physiology
Regional Blood Flow
Skin / blood supply*
Skin Temperature
Grant Support

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