| Autor: |
Doherty, Mike, Smith, Paul M, Hughes, Michael G, Davison, RC Richard |
| Předmět: |
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| Zdroj: |
Journal of Sports Sciences; Jul2004, Vol. 22 Issue 7, p637-643, 7p, 2 Graphs |
| Abstrakt: |
The aim of this study was to determine the effects of caffeine ingestion on a 'preloaded' protocol that involved cycling for 2 min at a constant rate of 100% maximal power output immediately followed by a 1-min 'all-out' effort. Eleven male cyclists completed a ramp test to measure maximal power output. On two other occasions, the participants ingested caffeine (5 mg · kg -1 ) or placebo in a randomized, double-blind procedure. All tests were conducted on the participants' own bicycles using a Kingcycle™ test rig. Ratings of perceived exertion (RPE; 6-20 Borg scale) were lower in the caffeine trial by approximately 1 RPE point at 30, 60 and 120 s during the constant rate phase of the preloaded test ( P <0.05). The mean power output during the all-out effort was increased following caffeine ingestion compared with placebo (794±164 vs 750±163 W; P = 0.05). Blood lactate concentration 4, 5 and 6 min after exercise was also significantly higher by approximately 1 mmol · l -1 in the caffeine trial ( P <0.05). These results suggest that high-intensity cycling performance can be increased following moderate caffeine ingestion and that this improvement may be related to a reduction in RPE and an elevation in blood lactate concentration. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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