THE EFFECT OF ACUTE BEETROOT JUICE SUPPLEMENTATION ON MUSCULAR STRENGTH AND ENDURANCE

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Author
Thorburn, Jack
Date
2015Type
Thesis
Publisher
Cardiff Metropolitan University
Metadata
Show full item recordAbstract
Dietary nitrate (NO3
-) supplementation with beetroot juice (BRJ) has previously been
shown to reduce the oxygen cost of submaximal exercise and prolong the onset of fatigue.
Nitric-oxide stimulating supplements such as l-Arginine have been found to increase
muscular strength and endurance during resistance exercise. However, the effect of NO3
-
supplementation via BRJ on muscular strength and endurance is currently unknown.
Therefore the aim of this study was to investigate the effects of acute BRJ
supplementation on muscular strength and endurance during resistance exercise. Ten
physically active males (20 ± 1yrs, 180 ± 5cm, 84 ± 11kg) volunteered to participate within
the study. Following an initial measure of one repetition max (1RM) leg press participants
were randomly assigned to consume either 70ml BRJ (NO3
-: 4.0mmol) or 70ml placebo
(PLA) (containing negligible NO3
-) in a blind, crossover design. Participants were required
to consume the assigned supplement 2.5 hours prior to the performance of both 1RM leg
press and 60% 1RM to muscular failure (TLV). Leg press 1RM significantly increased
following BRJ, compared to PLA (BRJ =435 ± 52 vs. PLA = 423 ± 49kg). No significant
difference was observed in leg press TLV between BRJ and PLA (P=0.06). Additionally,
there was no effect of BRJ on heart rate, systolic and diastolic blood pressure at rest or
post-exercise. These results indicate that acute BRJ supplementation improves muscular
strength, but not muscular endurance. However increased doses of NO3
- and repeated
bouts of resistance exercise may be required to elicit further ergogenic effect of BRJ
supplementation.
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