The Effects of Beetroot Supplementation and Habitual Dietary Nitrate Intake on Exercise Performance in Collegiate Female Rowing Athletes
Trial Snapshot
- Phase
- Not Applicable
- Status
- Completed
- Enrollment
- 15
- Locations
- 1
- Primary Endpoint
- Rowing Test Average Heart Rate
Study Overview
Brief Summary
The purpose of this study is to determine the effects of nitrate-rich beetroot juice supplementation on exercise performance in female rowers when accounting for habitual vegetable nitrate consumption.
Detailed Description
The objective is to use a stratified block randomization, double-blind crossover trial to test rowing ergometer exercise performance after drinking a beetroot juice supplement and compare it to the same test after consuming a placebo (a nitrate-free version of the beetroot juice supplement) in a convenience sample of athletes from a single Division 1-A collegiate women's rowing team.
Before testing, the participants' habitual vegetable nitrate consumption will be assessed from their report of foods consumed in the past 24 hours. Estimates of dietary nitrate intake will be calculated from the quantity of vegetables consumed and used to determine whether dietary nitrate intake influences the efficacy of the beetroot juice supplement.
Study Design
- Study Type
- Interventional
- Allocation
- Randomized
- Intervention Model
- Crossover
- Primary Purpose
- Supportive Care
- Masking
- Triple (Participant, Investigator, Outcomes Assessor)
Eligibility Criteria
- Ages
- 18 Years to 30 Years (Adult)
- Sex
- Female
- Accepts Healthy Volunteers
- Yes
Inclusion Criteria
- •Athletes currently on the university's rowing team
Exclusion Criteria
- •Injuries or medical conditions that prevent participation in their team's rowing training program
- •Diagnosis of stage 2 iron deficiency
- •Unable to consume beet juice for any reason
Arms & Interventions
Standard Beet Juice First
First Test: Beet Juice / Second Test: Placebo
Intervention: Beet Juice (Dietary Supplement)
Standard Beet Juice First
First Test: Beet Juice / Second Test: Placebo
Intervention: Placebo (Dietary Supplement)
Placebo Beet Juice First
First Test: Placebo / Second Test: Beet Juice
Intervention: Beet Juice (Dietary Supplement)
Placebo Beet Juice First
First Test: Placebo / Second Test: Beet Juice
Intervention: Placebo (Dietary Supplement)
Outcomes
Primary Outcomes
Rowing Test Average Heart Rate
Time Frame: Recorded during each of the 4 500-meter intervals during rowing time trial tests on day 7 and day 14.
Mean heart rate (beets per minute) during 500-meter rowing time trial tests.
Rowing Test Average Power Output
Time Frame: Recorded during each of the 4 500-meter intervals during rowing time trial tests on day 7 and day 14.
Mean power (watts) during 500-meter rowing time trial tests
Rowing Test Peak Heart Rate
Time Frame: Recorded during each of the 4 500-meter intervals during rowing time trial tests on day 7 and day 14.
Maximum heart rate (beats per minute) during 500-meter rowing time trial tests. The Maximum is the single highest heart rate recorded during that 500-meter interval.
Rowing Test Peak Power Output
Time Frame: Recorded during each of the 4 500-meter intervals during rowing time trial tests on day 7 and day 14.
Maximum power (watts) during 500-meter rowing time trial tests
Dietary Nitrate Habitual Consumption Category
Time Frame: Collected after each rowing time trial test for the preceding 24-hour period (day 6 and day 13). Median and categories determined in post-testing analysis.
Categorization of Dietary Nitrate Habitual Consumption Amount. The median of all participants' Amounts will be determined to categorize each participant as "high" (above median) or "low (below median).
Rowing Test Time
Time Frame: Recorded immediately upon completion of each of the 4 500-meter intervals during rowing time trial tests on day 7 and day 14.
Time (seconds) to complete 500-meter rowing time trial tests.
Rowing Test Perceived Exertion
Time Frame: Recorded immediately upon completion of each of the 4 500-meter intervals during rowing time trial tests on day 7 and day 14.
Rating of perceived exertion reported by participant during rowing time trial tests. The Borg Scale is used, in which participants choose a number between 6 ("Rest") and 20 ("Maximal Effort") to indicate their perceived exertion at the completion of each 500-meter segment.
Dietary Nitrate Habitual Consumption Amount
Time Frame: Collected after each rowing time trial test for the preceding 24-hour period (day 6 and day 13). Means determined in post-testing analysis.
Mean vegetable nitrate consumption (mg/day) from two different self-administered 24-hour dietary recalls (ASA24).
Secondary Outcomes
No secondary outcomes reported
Investigators
Jessica Provost
Principal Investigator, Doctoral Candidate, Graduate Teaching Assistant
University of Kansas Medical Center