Thermal Regulation During Acclimatization in a Hot, Dry (Desert Type) Environment

Eichna, Ludwig W.; Park, Charles R.; Nelson, Norton; Horvath, Steven M.; Palmes, E. D.

doi:10.1152/ajplegacy.1950.163.3.585

Cited by 125 publications

(65 citation statements)

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“…15), who showed that if the work rate is constant, the rectal temperature rises to the same value within a wide range of ambient temperatures. From this well confirmed observation (ref, 6,16,19)s he surmised that what was occurring was an elevation of the set point temperature. Although this interpretation was well received$ it has never been definitely proven from a regulatory point of view, Hammel et al (ref.…”

Section: Introductionmentioning

confidence: 53%

Reduced Set Point Temperature in Exercising Dog

Jackson¹,

Hammel²

1963

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Section: Introductionmentioning

confidence: 53%

Reduced Set Point Temperature in Exercising Dog

Jackson¹,

Hammel²

1963

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“…It is well-known that exercise heat acclimation induces a significant reduction in HR, and core and skin temperatures during exercise, as well as a significant increase in SR (Gisolfi and Cohen 1979;Eichna et al 1950;Mitchell et al 1976;Wyndham et al 1976). As we did not observe a significant increase in whole-body SR throughout exercise heat acclimation, or an increase in local SR during passive heating, it is likely that the magnitude of the adaptation induced by heat acclimation was mild in the present study.…”

Section: Discussionmentioning

confidence: 99%

Determination of the maximum rate of eccrine sweat glands’ ion reabsorption using the galvanic skin conductance to local sweat rate relationship

et al. 2015

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Purpose The purpose of the present study was to develop and describe a simple method to evaluate the rate of ion reabsorption of eccrine sweat glands in human using the measurement of galvanic skin conductance (GSC) and local sweating rate (SR). This purpose was investigated by comparing the SR threshold for increasing GSC with following two criteria of sweat ion reabsorption in earlier studies such as 1) the SR threshold for increasing sweat ion was at approximately 0.2 to 0.5 mg/cm 2 /min and 2) exercise-heat acclimation improved the sweat ion reabsorption ability and would increase the criteria 1.Methods Seven healthy non-heat-acclimated male subjects received passive heat treatment both before and after 7 days of cycling in hot conditions (50% maximum oxygen uptake, 60 min/day, ambient temperature 32°C, and 50% relative humidity).Results Subjects became partially heat-acclimated, as evidenced by the decreased end-exercise heart rate (p<0.01), rate of perceived exhaustion (p<0.01), and oesophageal temperature (p=0.07), without alterations in whole-body sweat loss, from the first to the last day of training. As hypothesised, we confirmed that the SR threshold for increasing GSC was near the predicted SR during passive heating before exercise heat acclimation, and increased significantly after training (0.19 ± 0.09 to 0.32 ± 0.10 mg/cm 2 /min, p<0.05).Conclusions The reproducibility of sweat ion reabsorption by the eccrine glands in the present study suggests that the relationship between GSC and SR can serve as a new index for assessing the maximum rate of sweat ion reabsorption of eccrine sweat glands in humans.

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“…When the blood volume is unchanged, as was true of the basal blood volume in experiments similar to those of the present study (8), the further conclusion that blood has shifted from the veins of the forearm to some other area is reasonable. (14).…”

Section: Discussionmentioning

confidence: 99%