Comparison of thermoregulatory responses to heat between Malaysian and Japanese males during leg immersion

Wijayanto, Titis; Wakabayashi, Hisao; Lee, Joo Young; Hashiguchi, Nobuko; Saat, Mohamed; Tochihara, Yutaka

doi:10.1007/s00484-010-0358-5

Cited by 26 publications

(29 citation statements)

References 34 publications

(74 reference statements)

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“…These findings are considered as heat adaptive traits of the Malaysian group which are common to various heat load tests. We summarized ethnic differences in Table 2 with data from Wijayanto et al (2011) and Wakabayashi et al (2011), to establish what the common and uncommon responses of heat adaptive traits in the three experimental conditions are. As heat acclimatization was intertwined by a multitude of physiological mechanisms, Table 2 would be beneficial in identifying mechanisms embracing morphological and functional adaptation in a holistic view.…”

Section: Discussionmentioning

confidence: 99%

“…The present study consisted of the following three experimental protocols: resting (Experiment 1), passive heating by legs immersion (Experiment 2 in Wijayanto et al 2011) and active heating by the cycle ergometer exercise (Experiment 3 in Wakabayashi et al 2011). Each subject participated all in the following four experiments ( _ VO 2 peak test, Experiments 1, 2, and 3) on 4 separate days.…”

Section: Methodsmentioning

confidence: 99%

“…The DT re were -0.23 ± 0.06°C and -0.09 ± 0.05°C for Japanese and Malaysians, respectively at rest; 0.66 ± 0.06°C and 0.31 ± 0.07°C (passive heating); 1.24 ± 0.09°C and 0.79 ± 0.04°C (the active heating). The time courses of T re during passive and active heating were presented in Wijayanto et al (2011) and Wakabayashi et al (2011), respectively.…”

Section: Rectal Temperaturementioning

confidence: 99%

“…Subjective responses were recorded every 10 min. More details on Experiment 2 were outlined in Wijayanto et al (2011).…”

Section: Experiments 1: Resting Conditionmentioning

confidence: 99%

“…difference on hand and foot skin temperatures diminished. The time courses of hand temperatures during passive and active heating were provided in Wijayanto et al (2011) and Wakabayashi et al (2011), respectively. At the end of passive heating, most skin temperatures showed no ethnic differences.…”

Section: Skin Temperaturesmentioning

confidence: 99%

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Ethnic differences in thermoregulatory responses during resting, passive and active heating: application of Werner’s adaptation model

et al. 2011

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For the coherent understanding of heat acclimatization in tropical natives, we compared ethnic differences between tropical and temperate natives during resting, passive and active heating conditions. Experimental protocols included: (1) a resting condition (an air temperature of 28°C with 50% RH), (2) a passive heating condition (28°C with 50% RH; leg immersion in a hot tub at a water temperature of 42°C), and (3) an active heating condition (32°C with 70% RH; a bicycle exercise). Morphologically and physically matched tropical natives (ten Malaysian males, MY) and temperate natives (ten Japanese males, JP) participated in all three trials. The results saw that: tropical natives had a higher resting rectal temperature and lower hand and foot temperatures at rest, smaller rise of rectal temperature and greater temperature rise in bodily extremities, and a lower sensation of thirst during passive and active heating than the matched temperate natives. It is suggested that tropical natives' homeostasis during heating is effectively controlled with the improved stability in internal body temperature and the increased capability of vascular circulation in extremities, with a lower thirst sensation. The enhanced stability of internal body temperature and the extended thermoregulatory capability of vascular circulation in the extremities of tropical natives can be interpreted as an interactive change to accomplish a thermal dynamic equilibrium in hot environments. These heat adaptive traits were explained by Wilder's law of initial value and Werner's process and controller adaptation model.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Rectal Temperaturementioning

confidence: 99%

“…Subjective responses were recorded every 10 min. More details on Experiment 2 were outlined in Wijayanto et al (2011).…”

Section: Experiments 1: Resting Conditionmentioning

confidence: 99%

Section: Skin Temperaturesmentioning

confidence: 99%

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Ethnic differences in thermoregulatory responses during resting, passive and active heating: application of Werner’s adaptation model

et al. 2011

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Human Heat Adaptation

Taylor

2014

Comprehensive Physiology

289

347

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In this overview, human morphological and functional adaptations during naturally and artificially induced heat adaptation are explored. Through discussions of adaptation theory and practice, a theoretical basis is constructed for evaluating heat adaptation. It will be argued that some adaptations are specific to the treatment used, while others are generalized. Regarding ethnic differences in heat tolerance, the case is put that reported differences in heat tolerance are not due to natural selection, but can be explained on the basis of variations in adaptation opportunity. These concepts are expanded to illustrate how traditional heat adaptation and acclimatization represent forms of habituation, and thermal clamping (controlled hyperthermia) is proposed as a superior model for mechanistic research. Indeed, this technique has led to questioning the perceived wisdom of body-fluid changes, such as the expansion and subsequent decay of plasma volume, and sudomotor function, including sweat habituation and redistribution. Throughout, this contribution was aimed at taking another step toward understanding the phenomenon of heat adaptation and stimulating future research. In this regard, research questions are posed concerning the influence that variations in morphological configuration may exert upon adaptation, the determinants of postexercise plasma volume recovery, and the physiological mechanisms that modify the cholinergic sensitivity of sweat glands, and changes in basal metabolic rate and body core temperature following adaptation.

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A century of exercise physiology: concepts that ignited the study of human thermoregulation. Part 4: evolution, thermal adaptation and unsupported theories of thermoregulation

Notley,

Mitchell,

Taylor

2023

Eur J Appl Physiol

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Comparison of thermoregulatory responses to heat between Malaysian and Japanese males during leg immersion

Cited by 26 publications

References 34 publications

Ethnic differences in thermoregulatory responses during resting, passive and active heating: application of Werner’s adaptation model

Ethnic differences in thermoregulatory responses during resting, passive and active heating: application of Werner’s adaptation model

Human Heat Adaptation

A century of exercise physiology: concepts that ignited the study of human thermoregulation. Part 4: evolution, thermal adaptation and unsupported theories of thermoregulation

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