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@inproceedings{1203331,
author = {Namešanský, Ján and Hrnčiříková, Iva and Smolka, Ondřej},
address = {Alicante},
booktitle = {Special Issue; Supplementary Issue: 8th INSHS International Christmas Sport Scientific Conference, 5-7 December 2013},
doi = {http://dx.doi.org/10.14198/jhse.2014.9.Proc1.39},
keywords = {endurance performance; cycling; nutrition supplements},
howpublished = {elektronická verze "online"},
language = {eng},
location = {Alicante},
pages = {504-511},
publisher = {University of Alicante},
title = {Caffeine effect on extending time to exhaustion},
year = {2014}
}
TY - JOUR
ID - 1203331
AU - Namešanský, Ján - Hrnčiříková, Iva - Smolka, Ondřej
PY - 2014
TI - Caffeine effect on extending time to exhaustion
PB - University of Alicante
CY - Alicante
KW - endurance performance
KW - cycling
KW - nutrition supplements
N2 - The purpose of this study was to determine the effect of different doses of caffeine on extending time to exhaustion in long-term endurance exercise. Using a placebo-controlled, double-blind crossover study design, 10 hobby male cyclists (30.3 ± 5.8 y; BMI = 23.5 ± 1.6, VO2max = 56.9 ± 6.6 ml x kg x min) completed three experimental tests. Each test consisted of 1-h steady-state cycling on static ergometer at 70% VO2max load immediately followed by graded exercise test to exhaustion (2.3 W x s). Either placebo or 0 or 7 mg x kg BM of synthetic caffeine with 0.5 l water and maximum of 0.5 mg x kg BM of carbohydrate gel were administered 70 minutes prior to the test. Total exercise time was significantly (p < 0.05) extended by the 7 mg x kg BM of caffeine compared with placebo. Significant (p < 0.05) extension of total exercise time was observed also by the 7 mg x kg compared with 2 mg x kg. No statistically (p = 0.97) significant differences were observed between 2 mg x kg compared with placebo. Positive effect of caffeine on long-term endurance in hobby cyclist was observed only after ingestion of high dosage (7 mg x kg BM). Low dosage (2 mg x kg) didn’t show any ergogenic effect compared with placebo. This result might not be generalized, but rather shows ambiguous effects of this substance.
ER -
NAMEŠANSKÝ, Ján, Iva HRNČIŘÍKOVÁ a Ondřej SMOLKA. Caffeine effect on extending time to exhaustion. Online. In \textit{Special Issue; Supplementary Issue: 8th INSHS International Christmas Sport Scientific Conference, 5-7 December 2013}. Alicante: University of Alicante, 2014, s.~504-511. ISSN~1988-5202. Dostupné z: https://dx.doi.org/10.14198/jhse.2014.9.Proc1.39.
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