Health Professions & Wellness

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Background: Beetroot juice (BJ) and caffeine (CAF) are considered as ergogenic aids among athletes to enhance performance, however, the ergogenic effects of BJ and CAF co-ingestion are unclear during team-sport-specific performance. This study aimed to investigate the acute effects of BJ and CAF co-ingestion on team-sport-specific performance, compared with placebo (PL), BJ, and CAF alone.

Method: Sixteen semi-professional male soccer players (age: 19.8±2.2 years, body mass: 69.2±6.1 kg, height: 177.3±6.0 cm) completed four experimental trials using a randomized, double-blind study design: BJ+CAF, CAF+PL, BJ+PL, and PL+PL. Countermovement jump with arm swing (CMJAS) performance and cognitive function by Stroop Word-Color test were evaluated before and after the Yo–Yo Intermittent Recovery Test level 1 (YYIR1). Also, rate of perceived exertion (RPE), heart rate, and gastrointestinal (GI) discomfort were measured during each session.

Results: No significant differences were shown between test conditions for total distance covered in YYIR1 (BJ+CAF: 1858±455 m, CAF+PL: 1798±422 m, BJ+PL: 1845±408 m, PL+PL 1740±362 m; p=0.55). Moreover, CMJAS performance, cognitive function, and RPE during the YYIR1 were not significantly different among conditions (p>0.05). However, the average heart rate during the YYIR1 was higher in CAF+PL compared to PL+PL (by 6±9 beats/min; p<0.05), and GI distress was greater in BJ+CAF compared to PL+PL (by 2.4±3.6 a.u.; p<0.05).

Conclusion: These results suggest, neither acute co-ingestion of BJ+CAF nor BJ or CAF supplementation alone significantly affected team-sport-specific performance compared to the PL treatment.

Publication/Presentation Information

Acute effects of beetroot juice and caffeine co-ingestion during a team-sport-specific intermittent exercise test in semi-professional soccer players: a randomized, double-blind, placebo-controlled study. BMC Sports Science, Medicine and Rehabilitation, 14(1), 2022, 1-11.



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