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The effect of ambient temperature on gross-efficiency in cycling
Time-trial performance deteriorates in the heat. This might potentially be the result of a temperature-induced decrease in gross-efficiency (GE). The effect of high ambient temperature on GE during cycling will be studied, with the intent of determining if a heat-induced change in GE could account f...
Autores principales: | , , , , , |
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Formato: | Texto |
Lenguaje: | English |
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Springer-Verlag
2007
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2039810/ https://www.ncbi.nlm.nih.gov/pubmed/17661069 http://dx.doi.org/10.1007/s00421-007-0519-3 |
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author | Hettinga, Florentina J. De Koning, Jos J. de Vrijer, Aukje Wüst, Rob C. I. Daanen, Hein A. M. Foster, Carl |
author_facet | Hettinga, Florentina J. De Koning, Jos J. de Vrijer, Aukje Wüst, Rob C. I. Daanen, Hein A. M. Foster, Carl |
author_sort | Hettinga, Florentina J. |
collection | PubMed |
description | Time-trial performance deteriorates in the heat. This might potentially be the result of a temperature-induced decrease in gross-efficiency (GE). The effect of high ambient temperature on GE during cycling will be studied, with the intent of determining if a heat-induced change in GE could account for the performance decrements in time trial exercise found in literature. Ten well-trained male cyclists performed 20-min cycle ergometer exercise at 60% [Formula: see text] (power output at which VO(2max) was attained) in a thermo-neutral climate (N) of 15.6 ± 0.3°C, 20.0 ± 10.3% RH and a hot climate (H) of 35.5 ± 0.5°C, 15.5 ± 3.2% RH. GE was calculated based on VO(2) and RER. Skin temperature (T(sk)), rectal temperature (T(re)) and muscle temperature (T(m)) (only in H) were measured. GE was 0.9% lower in H compared to N (19.6 ± 1.1% vs. 20.5 ± 1.4%) (P < 0.05). T(sk) (33.4 ± 0.6°C vs. 27.7 ± 0.7°C) and T(re) (37.4 ± 0.6°C vs. 37.0 ± 0.6°C) were significantly higher in H. T(m) was 38.7 ± 1.1°C in H. GE was lower in heat. T(m) was not high enough to make mitochondrial leakage a likely explanation for the observed reduced GE. Neither was the increased T(re). Increased skin blood flow might have had a stealing effect on muscular blood flow, and thus impacted GE. Cycling model simulations showed, that the decrease in GE could account for half of the performance decrement. GE decreased in heat to a degree that could explain at least part of the well-established performance decrements in the heat. |
format | Text |
id | pubmed-2039810 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2007 |
publisher | Springer-Verlag |
record_format | MEDLINE/PubMed |
spelling | pubmed-20398102007-10-29 The effect of ambient temperature on gross-efficiency in cycling Hettinga, Florentina J. De Koning, Jos J. de Vrijer, Aukje Wüst, Rob C. I. Daanen, Hein A. M. Foster, Carl Eur J Appl Physiol Original Article Time-trial performance deteriorates in the heat. This might potentially be the result of a temperature-induced decrease in gross-efficiency (GE). The effect of high ambient temperature on GE during cycling will be studied, with the intent of determining if a heat-induced change in GE could account for the performance decrements in time trial exercise found in literature. Ten well-trained male cyclists performed 20-min cycle ergometer exercise at 60% [Formula: see text] (power output at which VO(2max) was attained) in a thermo-neutral climate (N) of 15.6 ± 0.3°C, 20.0 ± 10.3% RH and a hot climate (H) of 35.5 ± 0.5°C, 15.5 ± 3.2% RH. GE was calculated based on VO(2) and RER. Skin temperature (T(sk)), rectal temperature (T(re)) and muscle temperature (T(m)) (only in H) were measured. GE was 0.9% lower in H compared to N (19.6 ± 1.1% vs. 20.5 ± 1.4%) (P < 0.05). T(sk) (33.4 ± 0.6°C vs. 27.7 ± 0.7°C) and T(re) (37.4 ± 0.6°C vs. 37.0 ± 0.6°C) were significantly higher in H. T(m) was 38.7 ± 1.1°C in H. GE was lower in heat. T(m) was not high enough to make mitochondrial leakage a likely explanation for the observed reduced GE. Neither was the increased T(re). Increased skin blood flow might have had a stealing effect on muscular blood flow, and thus impacted GE. Cycling model simulations showed, that the decrease in GE could account for half of the performance decrement. GE decreased in heat to a degree that could explain at least part of the well-established performance decrements in the heat. Springer-Verlag 2007-07-28 2007-11 /pmc/articles/PMC2039810/ /pubmed/17661069 http://dx.doi.org/10.1007/s00421-007-0519-3 Text en © Springer-Verlag 2007 |
spellingShingle | Original Article Hettinga, Florentina J. De Koning, Jos J. de Vrijer, Aukje Wüst, Rob C. I. Daanen, Hein A. M. Foster, Carl The effect of ambient temperature on gross-efficiency in cycling |
title | The effect of ambient temperature on gross-efficiency in cycling |
title_full | The effect of ambient temperature on gross-efficiency in cycling |
title_fullStr | The effect of ambient temperature on gross-efficiency in cycling |
title_full_unstemmed | The effect of ambient temperature on gross-efficiency in cycling |
title_short | The effect of ambient temperature on gross-efficiency in cycling |
title_sort | effect of ambient temperature on gross-efficiency in cycling |
topic | Original Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2039810/ https://www.ncbi.nlm.nih.gov/pubmed/17661069 http://dx.doi.org/10.1007/s00421-007-0519-3 |
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