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
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.