Accession Number : AD0720831

Title :   The Control of Human Thermoregulatory Heat Production.

Descriptive Note : Final scientific rept. (Part II), 1 Apr 66-30 Nov 70,

Corporate Author : INSTITUTE OF OCCUPATIONAL HEALTH HELSINKI (FINLAND) DEPT OF PHYSIOLOGY

Personal Author(s) : Piironen,Pekka ; Takalo,Kauko

Report Date : 30 NOV 1970

Pagination or Media Count : 32

Abstract : Experiments were carried out for the study of control of thermoregulatory heat production, in which continuous records were made of the test subject's oxygen consumption and of the different body temperatures. The skin temperature of the subject was controlled during the experiment by conducting temperature-controlled water onto the skin, with the aid of a special exposure suit. In the first experimental series, the subject's skin temperature was kept constant during the test and the blood temperature was allowed to decrease slowly; the results obtained by this procedure were considered to correspond to control in steady state situations. In the second series, the skin temperature was varied in programmed manner. Analysis of the results revealed that both the steady-state and dynamic experiments can not be explained with the same quantitative control assumptions if the hypothalamic and skin temperatures are assumed to be the sole controlling variables. When as a third controlling variable the gradient of skin temperature was taken into consideration, the dynamic experiments could be considerably better accounted for. (Author)

Descriptors :   (*HEAT PRODUCTION(BIOLOGY), CONTROL), (*BODY TEMPERATURE, CONTROL), SKIN(ANATOMY), TEMPERATURE, EXERCISE(PHYSIOLOGY), BLOOD, OXYGEN CONSUMPTION, PHYSIOLOGY, FINLAND

Subject Categories : Anatomy and Physiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE