NAMEŠANSKÝ, Ján (703 Slovakia, guarantor, belonging to the institution), Iva HRNČIŘÍKOVÁ (203 Czech Republic, belonging to the institution) and Ondřej SMOLKA (203 Czech Republic, belonging to the institution)
Edition
Alicante, Special Issue; Supplementary Issue: 8th INSHS International Christmas Sport Scientific Conference, 5-7 December 2013, p. 504-511, 8 pp. 2014
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.
Links
MUNI/A/0935/2012, interní kód MU
Name: Podávání kofeinu a jeho účinky na vytrvalostní výkon II (Acronym: KF II)