| Responses of lean and obese boys to repeated summer exercise in the heat bouts. | |
| | |
MedLine Citation:
|
PMID: 19127199 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
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. |
| | |
Authors:
|
Kelly A Dougherty; Mosuk Chow; W Larry Kenney |
Related Documents
:
|
15596699 - Exercise capacity in adult african-americans referred for exercise stress testing: is f... 19080359 - Correlation between obesity and female hyperostosis. 8772219 - Hes 200/0.5 is not hes 200/0.5. influence of the c2/c6 hydroxyethylation ratio of hydro... 10148719 - Exercise, lipids, and obesity in adolescents with parental history of coronary disease. 16350569 - Exercise and obesity. 6695339 - Basal and exercise tests on morbidly obese patients before and after gastric bypass. 2009849 - Effect of toeclip use during cycle ergometry on ventilatory threshold and vo2 max in tr... 14618539 - Fundamental predictability in multispecies competition: the influence of large disturba... 6812659 - Pulse injection, 13c tracer studies of lactate metabolism in humans during rest and two... |
Publication Detail:
|
Type: Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't |
Journal Detail:
|
Title: Medicine and science in sports and exercise Volume: 41 ISSN: 1530-0315 ISO Abbreviation: Med Sci Sports Exerc Publication Date: 2009 Feb |
Date Detail:
|
Created Date: 2009-01-20 Completed Date: 2009-05-08 Revised Date: 2012-06-28 |
Medline Journal Info:
|
Nlm Unique ID: 8005433 Medline TA: Med Sci Sports Exerc Country: United States |
Other Details:
|
Languages: eng Pagination: 279-89 Citation Subset: IM; S |
Affiliation:
|
Noll Laboratory, Department of Kinesiology, The Pennsylvania State University, University Park, PA 16802-6900, USA. kellydoc35@aol.com |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Acclimatization
/
physiology* Body Temperature Regulation / physiology* Case-Control Studies Child Exercise Test Exercise Tolerance / physiology* Heart Rate / physiology Humans Male Obesity / physiopathology* Sweating / physiology |
| Grant Support | |
ID/Acronym/Agency:
|
M01 RR010732-145069/RR/NCRR NIH HHS; M01-RR-10732/RR/NCRR NIH HHS; R01 AG007004/AG/NIA NIH HHS; R01 AG007004-18/AG/NIA NIH HHS; R01 AG007004-19A1/AG/NIA NIH HHS; R01-AG-07004-14/AG/NIA NIH HHS |
| Comments/Corrections | |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Bone density comparisons in male competitive road cyclists and untrained controls.
Next Document: Substrate utilization during and after exercise in mild cystic fibrosis.