Document Detail

Alterations of calf venous and arterial compliance following acclimation to heat administered at a fixed daily time in humans.
MedLine Citation:
PMID:  16450115     Owner:  NLM     Status:  MEDLINE    
We investigated the effects of heat acclimation on venous and arterial compliance in humans. Four male and four female volunteers were exposed to an ambient temperature of 40 degrees C and relative humidity of 40% for 4 h (1330-1730 hours) per day for 9-10 consecutive days. The calf venous compliance (CV) was estimated using venous occlusion plethysmography with a mercury-in-silastic strain gauge placed around the right calf at its maximum girth. The compliance of the small (CSA) and large (CLA) arteries were assessed by reflective and capacitance compliance by analyzing the radial artery blood pressure waveforms, basing on the use of a modified Windkessel model. The calf CV, CSA, CLA, systolic and diastolic blood pressures, heart rate and core temperature were determined twice a day, 0930-1100 hours (AM test) and 1500-1630 hours (PM test), in both heat-acclimated and non-heat-acclimated (control) conditions. Heat acclimation appeared to decrease blood pressures, heart rate and significantly lowered core temperature only in the PM test. In the control condition, the calf CV was not affected by the time of day and the CSA was significantly depressed in the PM test. After acclimation to heat, the calf CV significantly increased and the CSA did not decrease in the PM test. The results presented suggest that repeated heat exposure in humans, for 4 h at a fixed time daily, increases the calf CV and the CSA particularly during the period when the subjects were previously exposed to heat.
Megumi Maruyama; Toshiko Hara; Michio Hashimoto; Miki Koga; Osamu Shido
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2006-02-01
Journal Detail:
Title:  International journal of biometeorology     Volume:  50     ISSN:  0020-7128     ISO Abbreviation:  Int J Biometeorol     Publication Date:  2006 May 
Date Detail:
Created Date:  2006-05-03     Completed Date:  2006-12-20     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0374716     Medline TA:  Int J Biometeorol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  269-74     Citation Subset:  IM    
Department of Environmental Physiology, School of Medicine, Shimane University, Izumo, 693-8501, Japan.
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MeSH Terms
Arteries / physiopathology*
Blood Pressure / physiology
Body Temperature Regulation / physiology*
Hot Temperature*
Leg / blood supply,  physiology*
Plethysmography / methods
Time Factors
Veins / physiopathology*

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