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Effects of caffeine, L-carnitine and their combination on 400-m freestyle performance in female swimmers

Research Paper | November 1, 2014

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Mitra Azizimasouleh, Kobra Sharifi, Sahar Razmjoo, Pezhman Ahmadi

Key Words: Supplement, Performance, Adolescent swimmers, Blood lactate

Int. J. Biosci.5( 9), 1-8, November 2014

DOI: http://dx.doi.org/10.12692/ijb/5.9.1-8


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This study is aimed to examine the effect of caffeine ,L- carnitine, and their combination on lactate blood level, and exercise time during a 400 m freestyle swimming trial. 16 adolescent female freestyle swimmers were randomly divided into 4 groups; caffeine (3mg/kg), carnitine (1.5g), caffeine + carnitine (3 mg/kg + 1.5 g), and placebo. Supplements were consumed on 4 separate occasions before completing maximal 400-m freestyle trial. In each of the trials, Supplements were consumed 30 min prior to testing by Applying a single blind experimental design then the Statistical analysis was carried out on the relevant data using anova test. No significant differences (p =0 .05) were observed for performance in all groups whereas blood blood lactate concentration values in min 1 were lower in the caffeine trials compare to other groups. These findings showing that consuming 3mg/kg caffeine ,1.5 g L-carnitine and their combination has no meaningful effect on performance.


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Effects of caffeine, L-carnitine and their combination on 400-m freestyle performance in female swimmers

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