THE EFFECTS OF ACUTE BEETROOT JUICE INGESTION ON DIURNAL VARIATION IN REPEATED JUMP ABILITY
Payton Benoit, Luke Harms, Rebecca R. Rogers, Tyler D. Williams, Christopher G. Ballmann, FACSM. Samford University, Birmingham, AL.
BACKGROUND: Time of day fluctuations in exercise capability may hinder training and competition performance during morning hours. Beetroot juice (BRJ) is a natural source of dietary nitrate which has been shown to increase force output of muscle and induce skeletal muscle hyperemia. BRJ has been shown to prevent morning-associated decrements in repeated sprint ability, but it remains unknown if this translates to repetitive and short explosive movements. Therefore, the purpose of this study was to investigate the effects of BRJ on time-of-day changes on repeated jump ability and blood lactate. METHODS: Physically active males participated in three counterbalanced exercise trials under the following conditions: 1) Morning-Placebo (AM-PL), 2) Morning-BRJ (AM-BRJ; 70 mL; 400 mg NO3), and 3) Afternoon-Control (PM). For each morning trial, participants ingested their respective treatment 2 hours before exercise while no treatment was given for the afternoon. Participants completed 3 sets ´ 10 multi-rebound jumps while atop ground force plates. Participants were instructed to jump as high as possible for all repetitions. Each set was separated by 1 minutes of rest. Jumps were averaged for analysis. Blood lactate [La] was measured pre- and post- exercise. Trials were separated by a minimum of 48 hours. RESULTS: Findings showed that peak jump height (p= 0.266), force (p=0.625), and peak force (p= 0.497) were not different between treatments. While [La] increased pre- to post-exercise (p=0.048), no differences were observed between treatments (p=0.387). CONCLUSION: These results suggest that BRJ does influence time-of-day performance for repetitive and short explosive movements.
Benoit, P; Harms, L; Rogers, RR; Williams, TD; and Ballmann, FACSM, CG
"THE EFFECTS OF ACUTE BEETROOT JUICE INGESTION ON DIURNAL VARIATION IN REPEATED JUMP ABILITY,"
International Journal of Exercise Science: Conference Proceedings: Vol. 16:
2, Article 166.
Available at: https://digitalcommons.wku.edu/ijesab/vol16/iss2/166