Human heat tolerance in simulated environment.

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dc.contributor.authorNag, P Ken_US
dc.contributor.authorAshtekar, S Pen_US
dc.contributor.authorNag, Aen_US
dc.contributor.authorKothari, Den_US
dc.contributor.authorBandyopadhyay, Pen_US
dc.contributor.authorDesai, Hen_US
dc.date.accessioned1997-05-01en_US
dc.date.accessioned2009-05-27T08:34:50Z
dc.date.available1997-05-01en_US
dc.date.available2009-05-27T08:34:50Z
dc.date.issued1997-05-01en_US
dc.description.abstractThe heat tolerance of 11 male volunteers were examined under seven climatic conditions in a climatic chamber. The conditions were 38 to 49 degrees C dry bulb temperature and 45 to 80 per cent relative humidity, i.e., 32.3 to 40 degrees C effective temperature-basic [ET(B)]. The ET(B) values were equated to other heat stress indices, e.g., WBGT (Wet-bulb Globe Temperature Index) and Oxford Index. The subjects did ergometric work at an intensity of 60 per cent VO2max. The exposure durations were decided by the cardiorespiratory, body temperature and sweating responses. Of the climatic conditions studied, at 35.4, 38, 39 and 40 degrees C ET(B), the body core temperature (Tcr) reached over 39 degrees C and heart rates attained 172 to 182 beats/min, which were taken as the tolerance limit. The total oxygen demand significantly varied with the increase in environmental warmth, i.e., increase or decrease of one litre of oxygen demand was equivalent to one minute change in tolerance time. The volunteers were not susceptible to heat; only in extreme hot situations beyond 35.4 degrees C ET(B), were unacceptable levels of physiological and psychophysical reactions seen. The study suggests the acceptable and tolerable limits for human exposure in heat: (i) acceptable at 38 to 38.2 degrees C Tcr for a tolerance time of 80 to 85 min; and (ii) the tolerable limit of short duration (40-45 min) at 39 degrees C Tcr that corresponded to 31.5 and 36.5 degrees C ET(B).en_US
dc.description.affiliationErgonomics Division, National Institute of Occupational Health, Ahmedabad.en_US
dc.identifier.citationNag PK, Ashtekar SP, Nag A, Kothari D, Bandyopadhyay P, Desai H. Human heat tolerance in simulated environment. Indian Journal of Medical Research. 1997 May; 105(): 226-34en_US
dc.identifier.urihttps://imsear.searo.who.int/handle/123456789/24940
dc.language.isoengen_US
dc.source.urihttps://icmr.nic.in/ijmr/ijmr.htmen_US
dc.subject.meshAdolescenten_US
dc.subject.meshAdulten_US
dc.subject.meshBody Temperature Regulationen_US
dc.subject.meshExercise Testen_US
dc.subject.meshHeat Stress Disorders --physiopathologyen_US
dc.subject.meshHumansen_US
dc.subject.meshMaleen_US
dc.subject.meshOxygen Consumptionen_US
dc.subject.meshRandom Allocationen_US
dc.subject.meshTime Factorsen_US
dc.subject.meshTropical Climateen_US
dc.titleHuman heat tolerance in simulated environment.en_US
dc.typeJournal Articleen_US
dc.typeResearch Support, Non-U.S. Gov'ten_US
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