Document Detail


Control of internal temperature threshold for active cutaneous vasodilation by dynamic exercise.
MedLine Citation:
PMID:  1778949     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Exercise induces shifts in the internal temperature threshold at which cutaneous vasodilation begins. To find whether this shift is accomplished through the vasoconstrictor system or the cutaneous active vasodilator system, two forearm sites (0.64 cm2) in each of 11 subjects were iontophoretically treated with bretylium tosylate to locally block adrenergic vasoconstrictor control. Skin blood flow was monitored by laser-Doppler flowmetry (LDF) at those sites and at two adjacent untreated sites. Mean arterial pressure (MAP) was measured noninvasively. Cutaneous vascular conductance was calculated as LDF/MAP. Forearm sweat rate was also measured in seven of the subjects by dew point hygrometry. Whole body skin temperature was raised to 38 degrees C, and supine bicycle ergometer exercise was then performed for 7-10 min. The internal temperature at which cutaneous vasodilation began was recorded for all sites, as was the temperature at which sweating began. The same subjects also participated in studies of heat stress without exercise to obtain vasodilator and sudomotor thresholds from rest. The internal temperature thresholds for cutaneous vasodilation were higher during exercise at both bretylium-treated (36.95 +/- 0.07 degrees C rest, 37.20 +/- 0.04 degrees C exercise, P less than 0.05) and untreated sites (36.95 +/- 0.06 degrees C rest, 37.23 +/- 0.05 degrees C exercise, P less than 0.05). The thresholds for cutaneous vasodilation during rest or during exercise were not statistically different between untreated and bretylium-treated sites (P greater than 0.05). The threshold for the onset of sweating was not affected by exercise (P greater than 0.05).(ABSTRACT TRUNCATED AT 250 WORDS)
Authors:
D L Kellogg; J M Johnson; W A Kosiba
Related Documents :
9451629 - Alterations in the surface properties of lung surfactant in the torpid marsupial sminth...
8052119 - Rating of perceived exertion and heart rate as indicators of exercise intensity in diff...
497899 - Effect of alcohol on thermal balance of man in cold water.
9451529 - The convective afterdrop component during hypothermic exercise decreases with delayed e...
11001349 - Core temperature measurement during supine exercise: esophageal, rectal, and intestinal...
12185609 - Thermoregulatory responses to exercise and warm water immersion in physically trained m...
14635509 - A case of indirect exposure to cat at school.
3424269 - Effectiveness of a heat and moisture exchanger in preventing hyperpnoea induced broncho...
15454399 - Heart-type fatty acid-binding protein reciprocally regulates glucose and fatty acid uti...
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:  71     ISSN:  8750-7587     ISO Abbreviation:  J. Appl. Physiol.     Publication Date:  1991 Dec 
Date Detail:
Created Date:  1992-03-12     Completed Date:  1992-03-12     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:  2476-82     Citation Subset:  IM    
Affiliation:
Department of Physiology and Geriatric Research, Education, and Clinical Center, University of Texas, Health Science Center, San Antonio 78284.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:
Adult
Blood Flow Velocity
Blood Pressure
Body Temperature Regulation / physiology*
Exercise / physiology*
Humans
Male
Reflex / physiology
Skin / blood supply*
Vasoconstriction / physiology
Vasodilation / physiology*
Grant Support
ID/Acronym/Agency:
HL-20663/HL/NHLBI NIH HHS

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  Transcapillary fluid shifts in tissues of the head and neck during and after simulated microgravity.
Next Document:  Hyaluronan in human skeletal muscle of lower extremity: concentration, distribution, and effect of e...