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Comparison of heat dissipation response between Malaysian and Japanese males during exercise in humid heat stress

Published on Jul 1, 2011in International Journal of Biometeorology2.38
· DOI :10.1007/s00484-010-0374-5
Hitoshi Wakabayashi14
Estimated H-index: 14
(Kyushu University),
Titis Wijayanto7
Estimated H-index: 7
(Kyushu University)
+ 3 AuthorsYutaka Tochihara20
Estimated H-index: 20
(Kyushu University)
Cite
Abstract
This study investigated the differences in heat dissipation response to intense heat stress during exercise in hot and humid environments between tropical and temperate indigenes with matched physical characteristics. Ten Japanese (JP) and ten Malaysian (MY) males participated in this study. Subjects performed exercise for 60 min at 55% peak oxygen uptake in 32°C air with 70% relative humidity, followed by 30 min recovery. The increase in rectal temperature (T re) was smaller in MY during exercise compared to JP. The local sweat rate and total body mass loss were similar in both groups. Both skin blood flow and mean skin temperature was lower in MY compared to JP. A significantly greater increase in hand skin temperature was observed in MY during exercise, which is attributable to heat loss due to the greater surface area to mass ratio and large number of arteriovenous anastomoses. Also, the smaller increase in T re in MY may be explained by the presence of a significantly greater core–skin temperature gradient in MY than JP. The thermal gradient is also a major factor in increasing the convective heat transfer from core to skin as well as skin blood flow. It is concluded that the greater core–skin temperature gradient observed in MY is responsible for the smaller increase in T re.
  • References (32)
  • Citations (20)
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References32
Newest
Published on Jul 1, 2011in International Journal of Biometeorology2.38
Titis Wijayanto7
Estimated H-index: 7
(Kyushu University),
Hitoshi Wakabayashi14
Estimated H-index: 14
(Kyushu University)
+ 3 AuthorsYutaka Tochihara20
Estimated H-index: 20
(Kyushu University)
The objective of this study was to investigate thermoregulatory responses to heat in tropical (Malaysian) and temperate (Japanese) natives, during 60 min of passive heating. Ten Japanese (mean ages: 20.8 ± 0.9 years) and ten Malaysian males (mean ages: 22.3 ± 1.6 years) with matched morphological characteristics and physical fitness participated in this study. Passive heating was induced through leg immersion in hot water (42°C) for 60 min under conditions of 28°C air temperature and 50% RH. Loc...
Published on Jan 1, 2011in Comprehensive Physiology6.25
A. Pharo Gagge4
Estimated H-index: 4
(Yale University),
Yasunobu Nishi1
Estimated H-index: 1
(Yale University)
The sections in this article are: 1 Body Heat Balance Equations 2 Independent Variables in Human Thermal Environment 2.1 Ambient Temperature 2.2 Dew-point Temperature and Ambient Vapor Pressure 2.3 Air (and Fluid) Movement 2.4 Mean Radiant Temperature or Effective Radiant Field 2.5 Clothing Insulation 2.6 Barometric Pressure 2.7 Time of Exposure 3 Dependent Physiological Variables in Body Heat Balance Equation 3.1 Mean Skin Temperature 3.2 Skin Wettedness 3.3 Body Heat Storage and Rate Change of...
Published on Feb 1, 2010in Journal of Thermal Biology1.90
Joo-Young Lee24
Estimated H-index: 24
(Kyushu University),
Mohamed Saat8
Estimated H-index: 8
(RMIT: RMIT University)
+ 4 AuthorsYutaka Tochihara20
Estimated H-index: 20
(Kyushu University)
Abstract The purpose of this study was to investigate ethnic differences in cutaneous thermal sensation thresholds and the inter-threshold sensory zone between tropical (Malaysians) and temperate natives (Japanese). The results showed that (1) Malaysian males perceived warmth on the forehead at a higher skin temperature ( T sk ) than Japanese males ( p T sk in Malaysians ( p p T sk and slower at an identical speed of warming, and had a wider range of the inter-threshold sensory zone than tempera...
Published on Mar 1, 2009in International Journal of Biometeorology2.38
Jeong-Beom Lee12
Estimated H-index: 12
(SCH: Soonchunhyang University),
Jun-Sang Bae7
Estimated H-index: 7
(SCH: Soonchunhyang University)
+ 2 AuthorsMinYoung-Ki13
Estimated H-index: 13
(SCH: Soonchunhyang University)
Natives of the tropics are able to tolerate high ambient temperatures. This results from their long-term residence in hot and often humid tropical climates. This study was designed to compare the peripheral mechanisms of thermal sweating in tropical natives with that of their temperate counterparts. Fifty-five healthy male subjects including 20 native Koreans who live in the temperate Korean climate (Temperate-N) and 35 native tropical Malaysian men that have lived all of their lives in Malaysia...
Published on Jan 1, 2008
Nigel A. S. Taylor34
Estimated H-index: 34
,
Narihiko Kondo30
Estimated H-index: 30
,
W. Larry Kenney1
Estimated H-index: 1
Published on Jan 1, 2006in Journal of Thermal Biology1.90
Nigel A. S. Taylor34
Estimated H-index: 34
(UOW: University of Wollongong)
Abstract This paper focusses upon evidence of thermoregulatory differences among racially divergent humans. Thermal habituation is a central theme, explored first in the cold, and then within hot environments. The thermoeffector of primary interest is the eccrine sweat gland. It is hypothesised, with supporting evidence discussed, that the lower sweat secretion observed in indigenes from hot regions represents a form of thermoregulatory habituation. Finally, elements of experimental design are d...
Mohamed Saat8
Estimated H-index: 8
(Kyushu University),
Yutaka Tochihara20
Estimated H-index: 20
(Kyushu University)
+ 3 AuthorsChinmei Chou6
Estimated H-index: 6
(Kyushu University)
Published on Oct 1, 2004in Journal of Thermal Biology1.90
Jeong-Beom Lee12
Estimated H-index: 12
(SCH: Soonchunhyang University),
Jun-Sang Bae7
Estimated H-index: 7
(SCH: Soonchunhyang University)
+ 6 AuthorsTakaaki Matsumoto12
Estimated H-index: 12
(Aichi Medical University)
Abstract Tropical subjects regulate core temperature with less amount of sweat against heat compared to temperate subjects through long-term heat-acclimatization. The purpose of the study is to determine whether acclimatization in tropical subjects decay during a stay in temperate area. The aim of this study, therefore, was to investigate the possible changes in the peripheral sweating mechanisms. Local sweating response activated by acetylcholine (ACh) applied iontophoretically among Malaysians...
Published on Jan 1, 2003in Journal of human ergology
MyHang Nguyen3
Estimated H-index: 3
(Nara Women's University),
Hiromi Tokura12
Estimated H-index: 12
(PolyU: Hong Kong Polytechnic University)
3The present study compared between Japanese and Vietnamese subjects living in Hanoi, the local evaporation rate by sweating and the tympanic temperature during legs immersion in warm water. Seven Vietnamese and seven Japanese (who had lived in Hanoi for 1-2 years) participated in the experiments, which were performed in April, 2001 in Hanoi (Vietnam). It was found that the tympanic temperature at which subjects started to sweat in the forearm was significantly higher in Vietnamese than in Japan...
MyHang Nguyen3
Estimated H-index: 3
(Nara Women's University),
Hiromi Tokura19
Estimated H-index: 19
(Nara Women's University)
The observations described in this paper were made during a study of the effects of tropical climate upon Vietnamese and Japanese. We measured rectal and skin temperatures every 10 min for 26 hrs in 6 Vietnamese and 6 Japanese. The experiments have been conducted for 2 hot months, June and July 1999 and 2000 in Hanoi, Vietnam. The ambient temperatures ranged from 33 to 36°C. The results obtained are summarized as follows: 1) Skin temperatures at thigh, forearm and hand during the daytime were si...
Cited By20
Newest
Marco Morabito15
Estimated H-index: 15
,
Alessandro Messeri6
Estimated H-index: 6
+ 7 AuthorsBoris R.M. Kingma
Existing heat–health warning systems focus on warning vulnerable groups in order to reduce mortality. However, human health and performance are affected at much lower environmental heat strain levels than those directly associated with higher mortality. Moreover, workers are at elevated health risks when exposed to prolonged heat. This study describes the multilingual “HEAT-SHIELD occupational warning system” platform (https://heatshield.zonalab.it/) operating for Europe and developed within the...
Published on May 1, 2019in Building and Environment4.82
Toshiki Kamiya , Kazuma Hasegawa1
Estimated H-index: 1
+ 3 AuthorsAkimasa Hirata30
Estimated H-index: 30
Abstract Long-term heat acclimation in the tropics is a well-known positive response to cope with heat stress. A computational model of thermoregulatory responses from the population in the tropics has not yet been developed. This is partially because only a limited number of comparisons between the thermoregulation of people from different regions have been reported. Our group developed an integrated computational code of thermodynamics and thermoregulatory responses (blood flow and sweating ra...
Published on May 16, 2018in Frontiers in Physiology3.20
Martin Burtscher30
Estimated H-index: 30
(University of Innsbruck),
Hannes Gatterer17
Estimated H-index: 17
(University of Innsbruck)
+ 1 AuthorsHeimo Mairbäurl7
Estimated H-index: 7
(University Hospital Heidelberg)
Living, working and exercising in extreme terrestrial environments are challenging tasks even for healthy humans of the modern new age. The issue is not just survival in remote environments but rather the achievement of optimal performance in everyday life, occupation, and sports. Various adaptive biological processes can take place to cope with the specific stressors of extreme terrestrial environments like cold, heat and hypoxia (high altitude). This review provides an overview of the physiolo...
Published on Jan 30, 2018in Frontiers in Physiology3.20
Braid A. MacRae2
Estimated H-index: 2
(ETH Zurich),
Simon Annaheim10
Estimated H-index: 10
(Empa: Swiss Federal Laboratories for Materials Science and Technology)
+ 1 AuthorsRené M. Rossi24
Estimated H-index: 24
(Empa: Swiss Federal Laboratories for Materials Science and Technology)
Background. Skin temperature (Tskin) is commonly measured using Tskin sensors affixed directly to the skin surface, although the influence of setup variables on the measured outcome requires clarification. Objectives. The two distinct objectives of this systematic review were 1) to examine measurements from contact Tskin sensors considering equilibrium temperature and temperature disturbance, sensor attachments, pressure, environmental temperature, and sensor type, and 2) to characterise the con...
Published on Dec 1, 2017in Journal of Physiological Anthropology1.74
Titis Wijayanto7
Estimated H-index: 7
(Kyushu University),
Sayo Toramoto3
Estimated H-index: 3
(Kyushu University)
+ 3 AuthorsYutaka Tochihara20
Estimated H-index: 20
(Kyushu University)
Background Heat acclimatization studies have reported that tropical natives have better physiological function to tolerate heat exposure compared to those from temperate natives, in which may result in a better ability to show a better resistance to performance losses during heat stress. In this study, we investigate whether the degree of heat acclimatization affects cognitive abilities during heat exposure by comparing heat acclimatization level of subjects from Southeast Asia and temperate nat...
Published on Jul 1, 2017in Autonomic Neuroscience: Basic and Clinical2.25
Jeong-Beom Lee12
Estimated H-index: 12
(SCH: Soonchunhyang University),
Young-Oh Shin6
Estimated H-index: 6
(SCH: Soonchunhyang University)
Abstract Modification of sweating could be due to changes in activated sweat gland density (ASGD) and/or activated sweat gland output (ASGO). The present study determined regional and inter-ethnic differences in ASGD and ASGO during passive heating between tropical natives (African, n = 22) and temperate natives (Republic of Korean, n = 25). Heat load was carried out by immersing the half body into a hot water bath for 30 min. Tympanic temperature (Tty) and skin temperature (Ts) were measured. M...
Published on Apr 1, 2016in Journal of Paediatrics and Child Health1.69
Ming Ann Sim1
Estimated H-index: 1
(NUS: National University of Singapore),
Syen Yee Leow1
Estimated H-index: 1
(Boston Children's Hospital)
+ 1 AuthorsCheo Lian Yeo1
Estimated H-index: 1
(NUS: National University of Singapore)
Aim Thermoregulatory stability and monitoring are crucial in neonatal care. However, the current standard of temperature measurement using Axillary Thermometry (AT) poses multiple limitations. Temporal Artery Thermometry (TT) is a promising new method, which thus begs the question: Can TT replace AT in neonates? Previous studies reveal conflicting results, with none involving a Southeast-Asian multi-ethnic neonatal population under different environments. Methods A 6-month prospective comparativ...
Published on Jan 1, 2016in American Journal of Climate Change
Yoshihito Kurazumi6
Estimated H-index: 6
(Sugiyama Jogakuen University),
Jin Ishii5
Estimated H-index: 5
(Gidai: Gifu University)
+ 2 AuthorsAriya Aruninta2
Estimated H-index: 2
(Chula: Chulalongkorn University)
The outdoor thermal environment might become worse than at present. It causes health injuries through the deterioration of the outdoor thermal condition. It is necessary to study how humans stay outdoors and adjust to thermal conditions. The purpose of this study was to clarify the influence of the outdoor tropical urban thermal environment on a subject who has been acclimatized to the environment studied using the outdoor thermal environment evaluation index ETFe. In addition, the tendency of h...
Published on Oct 1, 2015in International Journal of Biometeorology2.38
Jun’ya Takakura2
Estimated H-index: 2
(Kyushu University),
Takayuki Nishimura7
Estimated H-index: 7
(Nagasaki University)
+ 2 AuthorsShigeki Watanuki12
Estimated H-index: 12
(Kyushu University)
A recent study showed that thermoregulatory-like cardiovascular responses can be invoked simply by exposure to visual information, even though the thermal environments are neutral and unchanged. However, it was not clear how such responses affect actual human body temperature regulation. We investigated whether such visually invoked physiological responses can substantively affect human core body temperature in a thermally challenging cold environment. Participants comprised 13 graduate or under...
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