| Aldosterone and prolactin response to exercise in the heat in circumpubertal boys. | |
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MedLine Citation:
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PMID: 1761469 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Thermoregulatory responses to exercise in the heat, especially sweating pattern, differ between children and adults. To determine whether such differences may be related to hormonal responses and to assess the possible association between this response and physical maturation, three groups of circumpubertal boys cycled at 50% of maximal O2 uptake (three 20-min bouts with 10 min of rest between bouts) in 42 degrees C at 20% relative humidity. On the basis of Tanner staging, 11 were prepubertal (PP), 12 midpubertal (MP), and 7 late pubertal (LP). Water ingestion was encouraged to minimize dehydration. Venous blood was sampled before and immediately after the session. Changes in heart rate, rectal temperature, and percent decrease in plasma volume did not differ among groups. There was no change in plasma osmolality in any of the groups. Resting testosterone concentrations were higher with increased level of physical maturity (PP = 0.4 +/- 0.1, MP = 8.2 +/- 1.9, LP = 13.8 +/- 1.2 nmol/l; P less than 0.05). In all groups, both aldosterone (ALD) and prolactin (PRL) markedly increased after exercise in the heat (ALD: PP = 161 +/- 40 vs. 1,289 +/- 263, MP = 173 +/- 47 vs. 1,245 +/- 153, LP = 250 +/- 76 vs. 1,681 +/- 400 pmol/l; PRL: PP = 8.1 +/- 1.2 vs. 24.9 +/- 4.2, MP = 8.8 +/- 1.0 vs. 22.0 +/- 8.9, LP = 8.4 +/- 0.8 vs. 39.0 +/- 3.6 micrograms/l; P less than 0.05).(ABSTRACT TRUNCATED AT 250 WORDS) |
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Authors:
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B Falk; O Bar-Or; J D MacDougall |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Journal of applied physiology (Bethesda, Md. : 1985) Volume: 71 ISSN: 8750-7587 ISO Abbreviation: J. Appl. Physiol. Publication Date: 1991 Nov |
Date Detail:
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Created Date: 1992-02-07 Completed Date: 1992-02-07 Revised Date: 2008-11-21 |
Medline Journal Info:
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Nlm Unique ID: 8502536 Medline TA: J Appl Physiol Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 1741-5 Citation Subset: IM |
Affiliation:
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Children's Exercise and Nutrition Centre, Faculty of Health Sciences, McMaster University, Hamilton, Ontario, Canada. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adolescent Aldosterone / blood* Body Temperature Regulation / physiology Child Chlorides / metabolism Exercise / physiology Hot Temperature Humans Male Prolactin / blood* Puberty / physiology* Sweat / metabolism Sweating / physiology Testosterone / blood |
| Chemical | |
Reg. No./Substance:
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0/Chlorides; 52-39-1/Aldosterone; 58-22-0/Testosterone; 9002-62-4/Prolactin |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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