Abstract

ARTEAGA-SACRO, Amy Andrea  and  VILLOTA-BEDOYA, Diego Fernando. Effect of acute caffeine consumption on the maximum force and blood lactate levels in sedentary young: Randomized clinical trial. Univ. Salud [online]. 2016, vol.18, n.2, pp.266-275. ISSN 0124-7107.

Objective: The aim of this study was to demonstrate the effect of caffeine in acute consumption on the maximum force and lactate levels. Material and methods: A randomized controlled trial of single-blind parallel group (participant) was done where 92 subjects were selected, 43 were assigned randomly to the caffeine intake group (1, 3 mg/Kg) or placebo control. The 1RM test was used to measure the maximum force and the lactate was determined by spectrophotometry (Sigma Kit commercial) before and after an hour of caffeine intake (1, 3 mg/Kg) or placebo. The statistical analysis was performed using the student t- test, and the percentage change and the effect size with Cohen's d-p ≤; 0.05. Results: There was a significant improve in the maximum force of upper limb of 1RM 8.3 ± 6.0 kg with an average effect size (26.2%; d = 0.64, t = -4.36, df = 41, p < 0.01; CI: -16.9 to -6.2); and lower limb 1RM 9.2 ± 4.9 kg with a medium effect size (25.8%; d = 0.51, t = -3.16, df = 41, p < 0.01, CI : -17.0 to -3.7). An increase in the lactate levels was observed in the experimental group 0.96 ± 0.10 mmol/L with a small effect size (64.9%; d = 0, 39; t = 10.8; gl = 41; p < 0.01;) CI: 0.55 to 0.81). Conclusions: Caffeine in low doses produces a higher increase in the maximum strength of upper limb, followed by the maximum force of lower limb and favors a smaller increase in lactate levels.

Keywords : Caffeine; muscular strength; lactate; exercise.

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