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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 and 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, p.~504-511. ISSN~1988-5202. Available from: https://dx.doi.org/10.14198/jhse.2014.9.Proc1.39.
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