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Cited by 44Thermoregulation and physiological responsesCardiovascular and exercise physiologyEffects of Environmental Stressors on Livestock

Responses of Lean and Obese Boys to Repeated Summer Exercise in the Heat Bouts

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DOUGHERTY, KELLY A., CHOW, MOSUK, KENNEY, W. LARRY·2009·Medicine & Science in Sports & Exercise
DOI 10.1249/mss.0b013e318185d341PMC PMC2629500
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Abstract

PURPOSE: To determine the degree of natural acclimatization and artificially induced acclimation-related changes during repeated exercise in the heat bouts in seven lean and seven obese 9- to 12-yr-old boys during summer months. METHODS: Beginning at random times during the summer, subjects underwent a 70-min exercise (30% VO(2max)) in the heat exposure (38 degrees C, 50% relative humidity) on six separate days. RESULTS: On day 1, obese children were less naturally acclimatized as indicated by significantly higher baseline core temperatures (T(c)) (obese = 37.62 +/- 0.06 vs lean = 37.41 +/- 0.06; P < 0.004). By day 6 versus day 1, significant reductions in baseline T(c) were evident in both groups (obese = 37.41 +/- 0.04 vs lean = 37.18 +/- 0.04; both P < 0.05). Baseline T(c) in obese subjects by day 6 was similar to that of lean subjects on day 1. Daily reductions in exercise T(c) were evident in both groups (final exercising T(c) day 1 vs day 6: obese = 38.15 +/- 0.05 vs 37.89 +/- 0.05; lean = 38.17 +/- 0.09 vs 37.72 +/- 0.06 degrees C; both P < 0.001), occurring at a significantly slower rate in obese subjects (final exercise T(c) day 6 - day 1: obese vs lean = -0.26 +/- 0.04 vs -0.45 +/- 0.08 degrees C; P < 0.05). Significant reductions in exercising heart rate (HR) occurred in the lean but not the obese subjects by day 6 (final exercising HR day 1 vs day 6: obese = 132 +/- 3 vs 131 +/- 3, P > 0.05; lean = 138 +/- 3 vs 127 +/- 3 bpm; P < 0.001). CONCLUSIONS: During summer months, obese children are less naturally heat-acclimatized and subsequently acclimate at a slower rate.

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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 [70]

  • 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 [70]

  • Several earlier physiological researches report higher body temperatures in obese individuals when compared with lean counterparts upon heat exposure and exercise.

    “Several earlier physiological researches report higher body temperatures in obese individuals when compared with lean counterparts upon heat exposure and exercise [69–71].”

    From Drivers of diversity in human thermal perception – A review for holistic comfort models (2018) · cites this paper as [70]

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Research works printed but not linked: 4

  1. [4]Bar-Or O Inbar O Lavallee H Shephard R 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 Ottawa, Canada Editions du Pelican 1977 205 214
  2. [14]Inbar O Acclimatization to dry and hot environment in young adults and children 8–10 years old [dissertation] Columbia University 1978 170
  3. [32]Sawka MN Wenger CB Pandolf KB Fregly MJ Blatteis CM Thermoregulatory responses to acute exercise-heat stress and heat acclimation Section 4: Environmental Physiology I New York Oxford University Press 1996 157 185
  4. [35]Tanner JM The development of the reproductive system Growth at Adolescence Oxford Blackwell Science 1962 28 39

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Authors
DOUGHERTY, K. A., CHOW, M., & KENNEY, W. L.
Affiliations
Pennsylvania State University (US)
ORCID
KENNEY, W. LARRY
Venue
Medicine & Science in Sports & Exercise
Publisher
Ovid Technologies (Wolters Kluwer Health)
Published
2009-02
Volume
41
Issue
2
Pages
279-289
ISSN
0195-9131 (ISSN-L)
DOI
10.1249/mss.0b013e318185d341
PMC
PMC2629500
OpenAlex
W1995707346
Cited by
44
References
32
Citations by year
2026: 6 · 2025: 1 · 2024: 2 · 2023: 4 · 2022: 3 · 2021: 2 · 2020: 5 · 2019: 3 · 2018: 2 · 2017: 2 · 2016: 1 · 2015: 1 · 2014: 2 · 2013: 4 · 2012: 1
FWCI
1.33
Type
journal article
Language
en
Open access
Locations
  • Medicine & Science in Sports & Exercise (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 acclimatization, obesity, children, repeated heat exposure, core body temperature, heart rate, thermoregulation
MeSH terms
Acclimatization, Body Temperature Regulation, Child, Exercise Test, Heart Rate, Humans, Male, Obesity, Sweating, Case-Control Studies, Exercise Tolerance

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