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PHYSIOLOGY Vol. 24, No. 4, April Prted U.S.A. depletion and oxygen the divg â DONALD C. JACKSOX Department of Physiology, School of Medice, Philadelbhia, Pennsylvania University of Pennsylvania, C. and oxygen depletion .JACKSON, DONALD the divg . J. Appl. Physiol. 24(4) : 503-509. 1968.Heat loss from the , Pseudemys scripta elegans, was measured by direct calorimetry durg experimental dives lastg 4 hr at 24 C and was correlated with the depletion rate of blood and lung oxygen. On the basis of this correlation the divg period was subdivided to three phases: I, heat loss at the predive rate persisted 20-25 m while oxygen concentrations were rapidly fallg; II, the rate of heat loss rapidly decled to 40% of the itial rate from 25-45 m while available oxygen reserves were exhausted; III, for the remader of the dive the rate of heat loss gradually decled to 15 % of the predive rate while oxygen reserves remaed low and constant. Central body temperature and muscle electrical activity decreased parallel fashion to heat loss when measured simultaneously durg divg. These results provide evidence for the hypothesis that rate falls durg divg due to reduction tissue oxygen supply. anaerobic calorimetry; metabolism; heat
Journal of Applied Physiology – The American Physiological Society
Published: Apr 1, 1968
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