caa a22 4500 469054379 CHVBK 20180323132839.0 cr unu---uuuuu 170328e19920501xx s 000 0 eng 10.1007/BF00705095 doi (NATIONALLICENCE)springer-10.1007/BF00705095 How should body heat storage be determined in humans: by thermometry or calorimetry? [Elektronische Daten] [André Vallerand, Gustave Savourey, Anne-Marie Hanniquet, Jacques Bittel] Summary: The aim of this study was to determine whether in humans there are differences in the heat storage calculated by partitional calorimetry (S, the balance of heat gains and heat losses) compared to the heat storage obtained by conventional methods (thermometry) via either core temperature or mean body temperatures ( $$\bar T_b = 0.8T_c + 0.2\bar T_{sk} $$ , whereT c is core temperature and $$\bar T_{sk} $$ is mean skin temperature) when two different sites are used as an index ofT c [rectal (T re) and auditory canal (T ac) temperatures]. Since women respond to the heat differently than men, both sexes were studied. After a stabilisation period at thermal neutrality, six men and seven women were exposed to a globe temperature of 50°C, relative humidity of 17% and wind speed of 0.8-1.0 m·s−1 for 90 min semi-nude at rest, whereT re,T ac, $$\bar T_{sk} $$ , metabolic rate, dry (radiant+convective heat exchange) and evaporative heat losses,S, heat storage byT c ( $$S_{T_c } $$ ) and heat storage by $$\bar T_b (S_{\bar T_b } )$$ were assessed every minute. In the men,S was equal to 350.8(SEM 49.6) kJ whereas $$S_{T_c } $$ amounted to only 114.6(SEM 16.2) and 196.7(SEM 32.3) kJ forT re andT ac, respectively (P<0.05). Final $$S_{\bar T_{b(re)} } $$ underestimatedS by 49% [177.7(SEM 23.0) kJ;P<0.05] whereas $$S_{\bar T_{b(ac)} } $$ was not significantly different than S [255.7(SEM 37.9) kJ]. In the women,S corresponded to a total of 294.3(SEM 23.2) kJ, a value that was very similar to the $$S_{\bar T_{b(ac)} } $$ 262.6(SEM 31.0) kJ], whereas $$S_{\bar T_{b(re)} } $$ underpredicted by 35% [190.4(SEM 26.3) kJ;P<0.05]. As in the men,S T c was much lower thanS [116.6(SEM 19.9) and 190.3(SEM 24.2) kJ forT re andT ac, respectively;P<0.05]. Using seven other well-known $$\bar T_b $$ weighting coefficients, $$S_{\bar T_b } $$ could under- and overestimateS by up to 55% and 11%, respectively. In all subjects, a large portion of the variance (68% and 75%) in the difference betweenS and $$S_{\bar T_b } $$ , could be explained primarily by the ΔT ac. The results demonstrated that although some estimates of thermometric heat storage matched the calorimetricS, other predictions underestimated it by up to 67% during passive heating. It is suggested that these differences can be explained in part by he site chosen to representT c, the use of eitherT c or $$\bar T_b $$ in the heat storage calculation, and the thermoneutral/hot weighting coefficient(s) chosen to determine $$\bar T_b $$ . Until more representative measurements of body temperatures at different depths (core, shell and intermediate) are possible, the use of $$\bar T_b $$ and $$\bar T_b $$ -derived heat storage is difficult to justify. Springer-Verlag, 1992 Core temperature nationallicence Heat balance nationallicence Heat exchanges nationallicence Heat stress nationallicence Mean body temperature nationallicence Vallerand André Defence and Civil Institute of Environmental Medicine, P. O. Box 2000, M3M 3B9, North York, Ontario, Canada aut Savourey Gustave Centre de Recherches du Service de Santé des Armées, Unité de Thermophysiologie, 24 Avenue des Maquis du Grésivaudan, B. P. 87, F-38702, Ła Tronche, Cedex, France aut Hanniquet Anne-Marie Centre de Recherches du Service de Santé des Armées, Unité de Thermophysiologie, 24 Avenue des Maquis du Grésivaudan, B. P. 87, F-38702, Ła Tronche, Cedex, France aut Bittel Jacques Centre de Recherches du Service de Santé des Armées, Unité de Thermophysiologie, 24 Avenue des Maquis du Grésivaudan, B. P. 87, F-38702, Ła Tronche, Cedex, France aut European Journal of Applied Physiology and Occupational Physiology Springer-Verlag 65/3(1992-05-01), 286-294 0301-5548 65:3<286 1992 65 421 https://doi.org/10.1007/BF00705095 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00705095 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Vallerand André Defence and Civil Institute of Environmental Medicine, P. O. Box 2000, M3M 3B9, North York, Ontario, Canada aut NATIONALLICENCE 700 1- Savourey Gustave Centre de Recherches du Service de Santé des Armées, Unité de Thermophysiologie, 24 Avenue des Maquis du Grésivaudan, B. P. 87, F-38702, Ła Tronche, Cedex, France aut NATIONALLICENCE 700 1- Hanniquet Anne-Marie Centre de Recherches du Service de Santé des Armées, Unité de Thermophysiologie, 24 Avenue des Maquis du Grésivaudan, B. P. 87, F-38702, Ła Tronche, Cedex, France aut NATIONALLICENCE 700 1- Bittel Jacques Centre de Recherches du Service de Santé des Armées, Unité de Thermophysiologie, 24 Avenue des Maquis du Grésivaudan, B. P. 87, F-38702, Ła Tronche, Cedex, France aut NATIONALLICENCE 773 0- European Journal of Applied Physiology and Occupational Physiology Springer-Verlag 65/3(1992-05-01), 286-294 0301-5548 65:3<286 1992 65 421 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer