| Peripheral vascular tone during heat load is modified by exercise intensity. | |
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MedLine Citation:
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PMID: 6684035 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Nonevaporative heat loss [ radiation (R) and convection (C) ] and evaporative heat loss [ evaporation (E) ] from the hand (Rh + Ch) and (Eh) were measured in four healthy men exercised on a bicycle ergometer at 20, 35, and 45% of VO2max at an ambient temperature (Ta) of 20 degrees C with a gradient layer type direct hand calorimeter. Esophageal (Tes) and mean skin temperatures (Tsk) were continuously measured. Leg exercise at these intensities produced initially a fall followed by an increase in (Rh + Ch). Tes was positively correlated to % VO2max during exercise. Thermal conductance in the hand (k) was computed by dividing the total heat loss from the hand (Rh + Ch + Eh) by the difference between Tes and mean hand temperature. All subjects had significantly lower (Rh + Ch) and k at a given Tes during exercise with a higher intensity. The slope indicating the relation between (Rh + Ch) and Tes was 9.18, 6.25, and 5.04 W per degree C at 20, 35, and 45% VO2max, respectively. The slope of k vs. Tes was 28.64, 20.82, and 16.61 W/m2 X degree C degree C at 20, 35, and 45% VO2max, respectively. These results indicated that thermoregulatory vasodilation was reduced by the increasing reflex vasoconstrictor tone caused by increasing intensity of exercise as a non-thermal factor. |
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Authors:
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K Hirata; T Nagasaka; A Hirai; M Hirashita; T Takahata |
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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: European journal of applied physiology and occupational physiology Volume: 51 ISSN: 0301-5548 ISO Abbreviation: Eur J Appl Physiol Occup Physiol Publication Date: 1983 |
Date Detail:
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Created Date: 1983-10-08 Completed Date: 1983-10-08 Revised Date: 2008-11-21 |
Medline Journal Info:
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Nlm Unique ID: 0410266 Medline TA: Eur J Appl Physiol Occup Physiol Country: GERMANY |
Other Details:
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Languages: eng Pagination: 7-15 Citation Subset: IM; S |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Body Temperature Body Temperature Regulation Calorimetry / instrumentation Capillaries Esophagus / physiology Hand Hot Temperature* Humans Male Muscle Tonus* Physical Exertion* Physiology Skin / blood supply* Skin Temperature |
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