The Effects of Acute Beetroot Juice Supplementation on Upper Body Strength and Endurance
Cardiff Metropolitan University
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An investigation into the ergogenic effects of acute beetroot juice (BR) supplementation on muscular strength and endurance performance. 10 male university students (mean ± SD age 20 ± 1 year; height 179.64 ± 4.91cm; mass 83.98 ± 11.04kg) with a minimum of 1 year resistance training completed 2 experimental trials T1 and T2, separated by a 3 day wash-out period, in a randomised, placebo controlled, crossover design. Participants completed an initial 1 repetition maximum (1RM) bench press test 2 days before T1. Following BR or placebo supplementation, participants performed the 1RM bench press test, followed by a maximum repetitions test of 60% of initial 1RM weight, separated by a 5 minute rest period. Following a 3 day wash-out period, groups were swapped and the tests repeated. Blood pressure (BP) was taken 5, 10 and 15 minutes post-exercise. Following a single 70ml dose of BR supplementation, T1 and T2 bench press 1RM (105.5 ± 23.2 and 130.6 ± 19.2 kg, respectively) and bench press total volume load (TLV) (1390.5 ± 152.5 and 1878 ± 388.1 N, respectively) increased (P<0.05) compared to placebo trials (130 ± 18.4 and 100 ± 20.6 kg; 1668.6 ± 457.1 and 1363.8 ± 147.1 N, respectively). Compared to placebo trials, BP 5, 10 and 15 minutes post-exercise decreased but not significantly (P>0.05) following BR supplementation. Conclusion: Acute BR supplementation increased strength and endurance in selected performance measures, specifically bench press.
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