Abstract

Effect of Caffeine Contained in Sports Drink on Hormones Producing Energy Following Sprint Test Performance in Male Soccer Players

Author(s):Mohammad Fayiz Abumoh'd, Laila M. Ali Matalqah and Samir Qasim

This study investigated the effect of caffeine contained in sports drink on hormones producing energy and sprint test performance in male soccer players. Twelve participants (25.97 ± 2.70 y) performed the test under three conditions (one week apart): caffeine with sports drink (SD-CAF), sports drink (SD), and placebo (PLA). Using a double-blind, placebo-controlled, randomized, crossover protocol, participants performed SD-CAF trial (5 mg/kg of caffeine contained in 300 ml of sports drink 30 minutes prior to sprinting test (7 × 30 m), SD trial (solely 300 ml of sports drink 30 minutes prior to sprinting test), or placebo. Blood analysis indicated significantly higher level of free thyroxine in SD-CAF (21.450 ± 3.048) compared to SD (18.742 ± 1.151) and PLA (16.983 ± 1.783). Similar findings existed regarding insulin (P < 0.05). However, DHEAs was significantly higher in PLA compared to SDCAF and SD. No statistical differences were observed between trials in testosterone and blood lactate (P > 0.05). No significant differences were observed between trials in first–fourth repetitions (P > 0.05). Time of fifth-seventh repetitions were significantly lower in SD-CAF compared to SD and PLA (P < 0.05), and were significantly lower in SD than that in PLA (P < 0.05). The time of 7th repetition was (4.331 ± 0.210, 4.610 ± 0.197, 4.816 ± 0.171 s for SD-CAF, SD, and PLA, respectively; P < 0.05). In conclusion, caffeine interferes hormones that are responsible for producing energy which in turn have a positive effect on repeated sprint bouts.

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