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Cited by 48Thermoregulation and physiological responsesCardiovascular and exercise physiologyEffects of Environmental Stressors on Livestock

Critical environmental limits for exercising heat-acclimated lean and obese boys

Open access
Dougherty, Kelly Anne, Chow, Mosuk, Larry Kenney, W.·2010·European Journal of Applied Physiology
DOI 10.1007/s00421-009-1290-4PMC PMC2948628
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Abstract

Environmental limits for uncompensable heat stress, above which an imbalance between heat gain and heat loss forces body core temperature upward (i.e., the upper limits of the prescriptive zone), are unknown for children. To determine these limits, 7 lean and 7 obese 9- to 12-year-old heat-acclimated boys performed four randomized trials each on separate days to determine the critical water vapor pressure (P (crit)) forcing an upward inflection of body core temperature at several ambient temperatures. Subjects walked continuously on a treadmill at 30% maximal aerobic capacity at a constant dry bulb temperature (T (db) = 34, 36, 38 or 42 degrees C). After a 30-min equilibration period at 9 torr, ambient water vapor pressure increased approximately 1 torr every 5-min until a distinct breakpoint in the core temperature versus time curve was evident. Compared to the lean subjects, obese subjects had significantly lower environmental limits (P < 0.03) in warm environments (P (crit), for lean vs. obese, respectively = 32.9 +/- 0.7 vs. 30.3 +/- 0.8 torr at T (db) = 34 degrees C; 29.6 +/- 0.6 vs. 27.2 +/- 0.9 torr at T (db) = 36 degrees C; 27.8 +/- 0.6 vs. 24.7 +/- 0.9 torr at T (db) = 38 degrees C; 25.5 +/- 0.7 vs. 24.5 +/- 1.5 torr at T (db) = 42 degrees C). These results suggest that separate critical environmental guidelines should be tailored to lean and obese children exercising in the heat.

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  • Out of four laboratory studies in normal-weight and overweight children, three show significant differences in thermal sensation between the two groups.

    “Out of four laboratory studies in normal-weight and overweight children, three show significant differences in thermal sensation between the two groups [70,74,77].”

    From Drivers of diversity in human thermal perception – A review for holistic comfort models (2018) · cites this paper as [77]

  • Overweight children perceived the thermal environment as being hotter than the non-overweight group, with corresponding higher body temperatures in the overweight children.

    “Overweight children perceived the thermal environment as being hotter than the non-overweight group, with corresponding higher body temperatures in the overweight children.”

    From Drivers of diversity in human thermal perception – A review for holistic comfort models (2018) · cites this paper as [77]

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1 of the 46 references couldn’t be matched to a known paper.

Research works printed but not linked: 1

  1. Bar-Or O Inbar O Lavallee H Shephard R 1977 Relationship between perceptual and physiological changes during heat acclimatization in 8–10 year old boys Frontiers of activity and child health: proceedings of the VIIth international symposium of paediatric work physiology Editions du Pelican Ottawa, Canada 205 214

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Authors
Dougherty, K. A., Chow, M., & Larry Kenney, W.
Affiliations
  • Children's Hospital of Philadelphia (US)
  • Pennsylvania State University (US)
Corresponding author
Dougherty, Kelly Anne
Venue
European Journal of Applied Physiology
Publisher
Springer Science and Business Media LLC
Published
2009-11-17
Volume
108
Issue
4
Pages
779-789
ISSN
  • 0020-9376 (ISSN-L)
  • 1439-6319
  • 1439-6327
DOI
10.1007/s00421-009-1290-4
PMC
PMC2948628
OpenAlex
W2023639274
Cited by
48
References
46
Citations by year
2026: 3 · 2025: 4 · 2024: 4 · 2023: 4 · 2022: 4 · 2021: 1 · 2020: 6 · 2019: 2 · 2018: 3 · 2017: 1 · 2016: 2 · 2014: 2 · 2013: 5 · 2012: 2
FWCI
1.55
Type
journal article
Language
en
Open access
Licence
www.springer.com/tdm (tdm)
Locations
  • European Journal of Applied Physiology (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institute on Aging (R01-AG-07004-14, R01AG007004)
  • National Center for Research Resources (M01 RR10732, M01RR010732)
Topics
  • Health Sciences › Medicine › Physiology › Thermoregulation and physiological responses
  • Health Sciences › Medicine › Complementary and alternative medicine › Cardiovascular and exercise physiology
  • Life Sciences › Agricultural and Biological Sciences › Animal Science and Zoology › Effects of Environmental Stressors on Livestock
Keywords
heat stress, core body temperature, heat acclimation, childhood obesity, children, treadmill exercise, dry bulb temperature
MeSH terms
Acclimatization, Body Temperature, Body Temperature Regulation, Child, Environment, Exercise Test, Physical Exertion, Hot Temperature, Humans, Male, Obesity, Oxygen Consumption, Sweating, Thinness, Exercise

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