Human thermoregulatory responses during cold-water immersion after artificially-induced sunburn
- Army Research Inst., Natick, MA (United States) Massachusetts General Hospital, Boston (United States)
Thermoregulatory responses during cold-water immersion (T{sub w} = 22C) were compared in 10 men prior to artificially-induced sunburn (CONB), as well as 24-h, and 1-wk after a 2 minimal erythemal dose of UV-B radiation (SUNB) which covered {approximately}85% of the body. After 10 min of rest in cold water, these men exercised for 50 min ({approximately}51% {dot V}O{sub 2}max). Esophageal (T{sub es}), rectal (T{sub re}), and mean skin ({bar T}{sub sk}) temperatures, mean heat flow ({bar h}{sub c}), and heart rate (HR) were measured. Venous blood samples were collected before and after immersion. The {bar T}{sub sk} was higher throughout the 60-min immersion both 24-h and 1-wk after SUNB compared to CONB. The {anti h}{sub c} was higher after 10 min resting immersion and during the first 10 min of exercise when 24-h SUNB waqs compared to CONB with the difference attributed to higher h{sub c} from the back and chest. While T{sub re} and HR did not differ between conditions, T{sub es} prior to and throughout the 60-min immersion was higher when 24-h SUNB was compared to CONB. Plasma volume increased after 1-wk SUNB compared to CONB while plasma protein was reduced. Post-exercise cortisol was greater 24-h SUNB compared to either CONB or 1-wk SUNB. In conclusion, sunburn impaired the ability of these men to vasoconstrict during cold-water immersion resulting in greater heat loss. These adverse effects were still present 1 wk after sunburn when the associated erythema had disappeared.
- OSTI ID:
- 5376074
- Report Number(s):
- CONF-9104107-; CODEN: FAJOE
- Journal Information:
- FASEB Journal (Federation of American Societies for Experimental Biology); (United States), Vol. 5:4; Conference: 75. annual meeting of the Federation of American Societies for Experimental Biology (FASEB), Atlanta, GA (United States), 21-25 Apr 1991; ISSN 0892-6638
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BLOOD VESSELS
VASOCONSTRICTION
HYPOTHERMIA
BIOLOGICAL EFFECTS
MAN
BLOOD
BODY TEMPERATURE
EXERCISE
INHIBITION
METABOLISM
TEMPERATURE EFFECTS
ULTRAVIOLET RADIATION
ANIMALS
BIOLOGICAL MATERIALS
BODY
BODY FLUIDS
CARDIOVASCULAR SYSTEM
ELECTROMAGNETIC RADIATION
MAMMALS
MATERIALS
ORGANS
PRIMATES
RADIATIONS
VERTEBRATES
560200* - Thermal Effects