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Effects of Isotonic Beetroot Supplementation on Sprint Interval Exercise Performance

Exercise Performance Clinical Trial

Official title:
The Effects of Isotonic Beetroot Supplementation on Sprint Interval Exercise Performance.

Clinical Trial Summary

This study aims to examine the effects of dietary nitrate supplementation via beetroot juice on sprint interval cycling exercise performance. Twenty-four participants (male or female) will undertake a randomized, crossover trial where they consume either (i) an isotonic beetroot juice drink containing nitrate (12.9 mmol) for 5 days or (ii) an isotonic sports drink (no nitrate) for 5 days. On Day 5 of each trial, participants will come to the laboratory and 2 hours after consuming their allocated drink will complete a 6 bouts of sprint interval exercise. Power output during cycling will be measured as the primary outcome measure. Salivary and plasma measures of nitrate and nitrite will be taken over the course of the morning on Day 5. After a 5-day washout period participants will crossover and begin their second trial.

Clinical Trial Description

This study aims to examine the effects of dietary nitrate supplementation via beetroot juice on sprint interval cycling exercise performance. Twenty-four participants (male or female) will undertake a randomized, crossover trial where they consume either (i) an isotonic beetroot juice drink containing nitrate (12.9 mmol) for 5 days or (ii) an isotonic sports drink (no nitrate) for 5 days. Drinks will be equivalent in isotonicity and colored the same so that participants and investigators will be blinded to each trial. Randomization and drink allocation will be completed by a third person not associated with the study team. On Day 5 of each trial, participants will come to the laboratory and 2 hours after consuming their allocated drink will complete a 6 bouts of sprint interval exercise (10 second all-out maximal sprints interspersed with 50 seconds rest). Power output (peak and mean) during cycling sprints will be measured as the primary outcome measure. Salivary measures of nitrate/nitrite will be taken at three time points over the course of the morning on Day 5 - (i) pre-drink consumption; (ii) 2 hours post-drink consumption; and (iii) post-exercise. Plasma measures of nitrate and nitrite will be taken at two time points over the course of the morning on Day 5 - (i) pre-drink consumption; and (ii) 2 hours post-drink consumption. Near infra-red spectroscopy (NIRS) will be used to measure muscle (vastus lateralis) oxygenation during cycling bouts. A Stroop test to measure inhibition (executive function) will be taken pre- and post-exercise. Sensory perception of the drink will be measured immediately post-consumption on Day 5. After a 5-day washout period participants will crossover and begin their second trial. ;

Study Design

Related Conditions & MeSH terms

Clinical Trial Details
NCT number NCT06349018
Study type Interventional
Source Nanyang Technological University
Contact Stephen Burns
Phone +65 67903354
Email stephen.burns@nie.edu.sg
Status Recruiting
Phase N/A
Start date February 20, 2024
Completion date February 28, 2025
View Details
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