Accession Number:

ADA000631

Title:

Plasma Volume Changes During Acute Exposure to a High Environmental Temperature,

Descriptive Note:

Corporate Author:

FLYING PERSONNEL RESEARCH COMMITTEE LONDON (ENGLAND)

Personal Author(s):

Report Date:

1974-02-01

Pagination or Media Count:

26.0

Abstract:

Plasma volume change during a two hour exposure to 48C dry bulb, 35C wet bulb has been assessed in terms of alterations in the haematocrit, plasma protein concentration, plasma osmolality, and isotopically-labelled albumin in six, non-heat acclimatised subjects. There was no significant difference between the slopes of the regressions describing the haematocrit, plasma protein, and labelled albumin. The results indicate that water is lost at a constant rate from the intravascular space during heat-induced dehydration, and that the haematocrit, and plasma protein concentration, are quantitatively representative of plasma volume change. Capillary permeability to albumin was not influenced by the environmental conditions. Water lost from the body during exposure to heat may be predominantly extracellular in origin. Modified author abstract

Subject Categories:

  • Stress Physiology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE