Practical precooling: Effect on cycling time trial performance in warm conditions
| Autor: | Marc J. Quod, Paul B. Laursen, Andrew S. Gardner, Allan G. Hahn, David T. Martin, Christopher J. Gore, Frank E. Marino, Shona L. Halson, Margaret Tate, David E. Mainwaring |
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| Rok vydání: | 2008 |
| Předmět: |
Adult
Male Materials science Physical Therapy Sports Therapy and Rehabilitation Body Temperature law.invention Animal science Time trial Randomized controlled trial Heart Rate law Immersion Task Performance and Analysis Humans Orthopedics and Sports Medicine Exercise physiology Exercise Simulation Cross-Over Studies Rectal temperature Skin cooling Crossover study Cold Temperature Water immersion Physical Endurance Cycling Body Temperature Regulation |
| Zdroj: | Journal of Sports Sciences. 26:1477-1487 |
| ISSN: | 1466-447X 0264-0414 |
| Popis: | The purpose of this study was to compare the effects of two practical precooling techniques (skin cooling vs. skin + core cooling) on cycling time trial performance in warm conditions. Six trained cyclists completed one maximal graded exercise test (VO2(peak) 71.4 +/- 3.2 ml x kg(-1) x min(-1)) and four approximately 40 min laboratory cycling time trials in a heat chamber (34.3 degrees C +/- 1.1 degrees C; 41.2% +/- 3.0% rh) using a fixed-power/variable-power format. Cyclists prepared for the time trial using three techniques administered in a randomised order prior to the warm-up: (1) no cooling (control), (2) cooling jacket for 40 min (jacket) or (3) 30-min water immersion followed by a cooling jacket application for 40 min (combined). Rectal temperature prior to the time trial was 37.8 degrees C +/- 0.1 degrees C in control, similar in jacket (37.8 degrees C +/- 0.3 degrees C) and lower in combined (37.1 degrees C +/- 0.2 degrees C, P0.01). Compared with the control trial, time trial performance was not different for jacket precooling (-16 +/- 36 s, -0.7%; P = 0.35) but was faster for combined precooling (-42 +/- 25 s, - .8%; P = 0.009). In conclusion, a practical combined precooling strategy that involves immersion in cool water followed by the use of a cooling jacket can produce decrease in rectal temperature that persist throughout a warm-up and improve laboratory cycling time trial performance in warm conditions. |
| Databáze: | OpenAIRE |
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