Source:http://linkedlifedata.com/resource/pubmed/id/20724560
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| Predicate | Object |
|---|---|
| rdf:type | |
| lifeskim:mentions | |
| pubmed:issue |
4
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| pubmed:dateCreated |
2010-10-13
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| pubmed:abstractText |
This study examined the impact of heat acclimation on improving exercise performance in cool and hot environments. Twelve trained cyclists performed tests of maximal aerobic power (VO2max), time-trial performance, and lactate threshold, in both cool [13°C, 30% relative humidity (RH)] and hot (38°C, 30% RH) environments before and after a 10-day heat acclimation (?50% VO2max in 40°C) program. The hot and cool condition VO2max and lactate threshold tests were both preceded by either warm (41°C) water or thermoneutral (34°C) water immersion to induce hyperthermia (0.8-1.0°C) or sustain normothermia, respectively. Eight matched control subjects completed the same exercise tests in the same environments before and after 10 days of identical exercise in a cool (13°C) environment. Heat acclimation increased VO2max by 5% in cool (66.8 ± 2.1 vs. 70.2 ± 2.3 ml·kg(-1)·min(-1), P = 0.004) and by 8% in hot (55.1 ± 2.5 vs. 59.6 ± 2.0 ml·kg(-1)·min(-1), P = 0.007) conditions. Heat acclimation improved time-trial performance by 6% in cool (879.8 ± 48.5 vs. 934.7 ± 50.9 kJ, P = 0.005) and by 8% in hot (718.7 ± 42.3 vs. 776.2 ± 50.9 kJ, P = 0.014) conditions. Heat acclimation increased power output at lactate threshold by 5% in cool (3.88 ± 0.82 vs. 4.09 ± 0.76 W/kg, P = 0.002) and by 5% in hot (3.45 ± 0.80 vs. 3.60 ± 0.79 W/kg, P < 0.001) conditions. Heat acclimation increased plasma volume (6.5 ± 1.5%) and maximal cardiac output in cool and hot conditions (9.1 ± 3.4% and 4.5 ± 4.6%, respectively). The control group had no changes in VO2max, time-trial performance, lactate threshold, or any physiological parameters. These data demonstrate that heat acclimation improves aerobic exercise performance in temperate-cool conditions and provide the scientific basis for employing heat acclimation to augment physical training programs.
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| pubmed:grant | |
| pubmed:language |
eng
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| pubmed:journal | |
| pubmed:citationSubset |
IM
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| pubmed:chemical | |
| pubmed:status |
MEDLINE
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| pubmed:month |
Oct
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| pubmed:issn |
1522-1601
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| pubmed:author | |
| pubmed:issnType |
Electronic
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| pubmed:volume |
109
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| pubmed:owner |
NLM
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| pubmed:authorsComplete |
Y
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| pubmed:pagination |
1140-7
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| pubmed:dateRevised |
2011-10-3
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| pubmed:meshHeading |
pubmed-meshheading:20724560-Acclimatization,
pubmed-meshheading:20724560-Adaptation, Physiological,
pubmed-meshheading:20724560-Adolescent,
pubmed-meshheading:20724560-Adult,
pubmed-meshheading:20724560-Anaerobic Threshold,
pubmed-meshheading:20724560-Bicycling,
pubmed-meshheading:20724560-Cardiac Output,
pubmed-meshheading:20724560-Cold Temperature,
pubmed-meshheading:20724560-Exercise,
pubmed-meshheading:20724560-Female,
pubmed-meshheading:20724560-Heart Rate,
pubmed-meshheading:20724560-Hot Temperature,
pubmed-meshheading:20724560-Humans,
pubmed-meshheading:20724560-Hyperthermia, Induced,
pubmed-meshheading:20724560-Lactic Acid,
pubmed-meshheading:20724560-Male,
pubmed-meshheading:20724560-Muscle, Skeletal,
pubmed-meshheading:20724560-Muscle Contraction,
pubmed-meshheading:20724560-Muscle Strength,
pubmed-meshheading:20724560-Oxygen Consumption,
pubmed-meshheading:20724560-Plasma Volume,
pubmed-meshheading:20724560-Time Factors,
pubmed-meshheading:20724560-Young Adult
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| pubmed:year |
2010
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| pubmed:articleTitle |
Heat acclimation improves exercise performance.
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| pubmed:affiliation |
Dept. of Human Physiology, Univ. of Oregon, Eugene, OR 97403-1240, USA.
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| pubmed:publicationType |
Journal Article,
Randomized Controlled Trial,
Research Support, Non-U.S. Gov't,
Research Support, N.I.H., Extramural
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