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Ergogenic effects of betaine supplementation on strength and power performance

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Author(s): Lee Elaine | Maresh Carl | Kraemer William | Yamamoto Linda | Hatfield Disa | Bailey Brooke | Armstrong Lawrence | Volek Jeff | McDermott Brendon | Craig Stuart

Journal: Journal of the International Society of Sports Nutrition
ISSN 1550-2783

Volume: 7;
Issue: 1;
Start page: 27;
Date: 2010;
Original page

ABSTRACT
Abstract Background We investigated the ergogenic effects of betaine (B) supplementation on strength and power performance. Methods Twelve men (mean ± SD age, 21 ± 3 yr; mass, 79.1 ± 10.7 kg) with a minimum of 3 months resistance training completed two 14-day experimental trials separated by a 14-day washout period, in a balanced, randomized, double-blind, repeated measures, crossover design. Prior to and following 14 days of twice daily B or placebo (P) supplementation, subjects completed two consecutive days (D1 and D2) of a standardized high intensity strength/power resistance exercise challenge (REC). Performance included bench, squat, and jump tests. Results Following 14-days of B supplementation, D1 and D2 bench throw power (1779 ± 90 and 1788 ± 34 W, respectively) and isometric bench press force (2922 ± 297 and 2503 ± 28 N, respectively) were increased (p < 0.05) during REC compared to pre-supplementation values (1534 ± 30 and 1498 ± 29 W, respectively; 2345 ± 64 and 2423 ± 84 N, respectively) and corresponding P values (1374 ± 128 and 1523 ± 39 W; 2175 ± 92 and 2128 ± 56 N, respectively). Compared to pre-supplementation, vertical jump power and isometric squat force increased (p < 0.05) on D1 and D2 following B supplementation. However, there were no differences in jump squat power or the number of bench press or squat repetitions. Conclusion B supplementation increased power, force and maintenance of these measures in selected performance measures, and these were more apparent in the smaller upper-body muscle groups.
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