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Advisor(s)
Abstract(s)
Despite the numerous scientific evidence on the topic, there is no
clear and consistent answer that clarifies the true effects of beet-
root juice (BJ) supplementation on different types of physical per-
formance. This study examined whether an acute intake of BJ im-
proves swimming performance, physiological variables of anaer-
obic metabolism, or subjective measures during high-intensity in-
terval exercise with incomplete rest in competitive swimmers.
Eighteen competitive swimmers (nine females and nine males)
participated in this cross-over randomized, placebo-controlled,
double-blind and counterbalanced study. In two trials, swimmers
ingested BJ (70 mL, 6.4 mmol/400 mg NO3-) or placebo (PLA)
(70 mL, 0.04 mmol/3 mg NO3-) three hours before a 2×6×100 m
maximal effort with 40 seconds rest between repetitions and three
minutes between blocks. The 100 m times showed no differences
between groups (p > 0.05), but there was an interaction between
block×repetition×condition (F5 = 3.10; p = 0.046; ηp2 = 0.54), in-
dicating that the BJ group decreased the time of the sixth repeti-
tion of block2 compared to block1 (p = 0.01). Lactate concentra-
tion showed no differences between conditions (p > 0.05), but
there was a main effect of block (ηp2 = 0.60) and a block×repeti-
tion interaction (ηp2 = 0.70), indicating higher values in block2
and increasing values between repetitions in block1. The subjec-
tive scales, perception of exertion (RPE) and Total Quality Re-
covery (TQR), showed no effects of condition (p > 0.05), but BJ
swimmers had a greater TQR in the last repetitions of each block.
In conclusion, a single dose of BJ did not enhance intermittent
swimming performance or modified the physiological (lactate
and heart rate) or subjective (RPE and TQR) variables; although
there was a possible positive effect on the exercise tolerance at
the end of effort.
Description
Keywords
Nitrate Ergogenic aids Intermittent efforts Swimming performance Exercise tolerance
Citation
Moreno-Heredero, Berta; Morencos, Esther; Morais, Jorge; Barbosa, Tiago M.; Veiga, Santiago (2024). A single dose of beetroot juice not enhance performance during intervallic swimming efforts. Journal of Sports Science & Medicine. eISSN 1303-2968. 23:1, p. 228-235
Publisher
Medical Faculty of Uludag University