Dietary nitrate ingestion improves muscular endurance of bench press in males

Presentation Type

Poster

Presentation Type

Submission

Keywords

beetroot, ergogenic aid, dietary nitrate, nitric oxide, resistance training

Department

Sports Medicine

Major

Sports Medicine

Abstract

We assessed effects of acute and short-term nitrate-rich beetroot juice (BR) supplementation on muscular power, speed, and endurance and muscle oxygenation during resistance exercise. Fourteen recreationally active males were assigned in a randomized, double-blind, crossover design to supplement for 4 days in two conditions: 1) nitrate-depleted beetroot juice (PL; negligible nitrate) and 2) BR (12.0 mmol nitrate per day). On days 1 and 4 of the supplementation periods, a resting blood sample was obtained and participants completed 2 sets of 2 × 70%1RM interspersed by 2 min of recovery, followed by 1 set of repetitions-to-failure (RTF) at 60%1RM. Quadriceps and pectoralis major tissue oxygenation was measured throughout exercise. Plasma [nitrate] and [nitrite] were higher in BR on both day 1 and day 4 compared to all PL trials (P < 0.05). RTF improved by 5% in bench press after BR (day 1: 23.9 ± 4.5 vs. day 4: 24.4 ± 4.9) compared to PL (day 1: 22.7 ± 4.4 vs. day 4: 23.9 ± 4.0, P < 0.05) with no difference between days in both conditions. There were no differences in RTF for back squat or power and velocity for back squat or bench press (P > 0.05). There was no difference in muscle oxygenation between conditions (P > 0.05) These data indicate that acute and multi-day BR supplementation improves muscular endurance during bench press exercise.

Faculty Mentor

Dr. Rachel Tan

Funding Source or Research Program

Not Identified

Location

Waves Cafeteria

Start Date

24-3-2023 2:00 PM

End Date

24-3-2023 4:00 PM

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Mar 24th, 2:00 PM Mar 24th, 4:00 PM

Dietary nitrate ingestion improves muscular endurance of bench press in males

Waves Cafeteria

We assessed effects of acute and short-term nitrate-rich beetroot juice (BR) supplementation on muscular power, speed, and endurance and muscle oxygenation during resistance exercise. Fourteen recreationally active males were assigned in a randomized, double-blind, crossover design to supplement for 4 days in two conditions: 1) nitrate-depleted beetroot juice (PL; negligible nitrate) and 2) BR (12.0 mmol nitrate per day). On days 1 and 4 of the supplementation periods, a resting blood sample was obtained and participants completed 2 sets of 2 × 70%1RM interspersed by 2 min of recovery, followed by 1 set of repetitions-to-failure (RTF) at 60%1RM. Quadriceps and pectoralis major tissue oxygenation was measured throughout exercise. Plasma [nitrate] and [nitrite] were higher in BR on both day 1 and day 4 compared to all PL trials (P < 0.05). RTF improved by 5% in bench press after BR (day 1: 23.9 ± 4.5 vs. day 4: 24.4 ± 4.9) compared to PL (day 1: 22.7 ± 4.4 vs. day 4: 23.9 ± 4.0, P < 0.05) with no difference between days in both conditions. There were no differences in RTF for back squat or power and velocity for back squat or bench press (P > 0.05). There was no difference in muscle oxygenation between conditions (P > 0.05) These data indicate that acute and multi-day BR supplementation improves muscular endurance during bench press exercise.