Caffeine effect on extending time to exhaustion

Ján Namešanský, Iva Hrnčiříková, Ondřej Smolka

Abstract

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⁻¹ x min⁻¹) 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⁻¹). Either placebo or 0 or 7 mg x kg⁻¹ BM of synthetic caffeine with 0.5 l water and maximum of 0.5 mg x kg⁻¹ 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⁻¹ BM of caffeine compared with placebo. Significant (p < 0.05) extension of total exercise time was observed also by the 7 mg x kg⁻¹ compared with 2 mg x kg⁻¹. No statistically (p = 0.97) significant differences were observed between 2 mg x kg⁻¹ 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⁻¹ BM). Low dosage (2 mg x kg⁻¹) didn’t show any ergogenic effect compared with placebo. This result might not be generalized, but rather shows ambiguous effects of this substance.


Keywords

endurance performance, cycling, nutrition supplements



DOI: https://doi.org/10.14198/jhse.2014.9.Proc1.39



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