Author/Editor		Mittleman, KD; Mekjavić, IB
Title		Effect of occluded venous return on core temperature during cold water immersion
Type		članek
Source		J Appl Physiol
Vol. and No.		Letnik 65, št. 6
Publication year		1988
Volume		str. 2709-13
Language		eng
Abstract		Recent studies using inanimate and animal models suggest that the afterdrop observed upon rewarming from hypothermia is based entirely on physical laws of heat flow without involvement of the returning cooled blood from the limbs. During the investigation of thermoregulatory responses to cold water immersion (15 degrees C), blood flow to the limbs (minimized by the effects of hydrostatic pressure and vasoconstriction) was occluded in 17 male subjects (age, 29.0 +/- 3.3 yr). Comparisons of rectal (Tre) and esophageal temperature (Tes) responses were made during the 5 min before occlusion, during the 10-min occlusion period, and for 5 min immediately after the release of the cuffs (postocclusion). In the preocclusion phase, Tre and Tes showed similar cooling rates. The occlusion of blood flow to the extremities significantly arrested the cooling of Tes (P less than 0.05) with little effect on Tre. Upon release of the pressure cuffs, the returning extremity blood flow resulted in an increased rate of cooling, that was three times greater at the esophageal site (-0:149 +/- 0.052 vs. -0.050 +/- 0.026 degrees C.min-1). These results suggest that the cooled peripheral circulation, minimized during cold water immersion, may dramatically affect esophageal temperature and the complete neglect of the circulatory component to the afterdrop phenomenon is not warranted.
Descriptors		BLOOD CIRCULATION BODY TEMPERATURE REGULATION COLD IMMERSION ADULT CONSTRICTION EXTREMITIES HYPOTHERMIA VEINS