Dietary Habits, Exercise, Nitrates
Conditions
Keywords
dietary nitrate, beetroot juice, sex differences, exercise, performance, muscle
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.
Interventions
DIETARY_SUPPLEMENTBeet Juice
70 milliliter (70mL) standard Beet Juice (Beet It Sport Shot) consumed 2.5 hours before exercise test
DIETARY_SUPPLEMENTPlacebo
70mL placebo Beet Juice (Beet It Sport Shot with nitrate removed) consumed 2.5 hours before exercise test
Sponsors
University of Kansas Medical Center
Study design
Allocation
RANDOMIZED
Intervention model
CROSSOVER
Primary purpose
SUPPORTIVE_CARE
Masking
TRIPLE (Subject, Investigator, Outcomes Assessor)
Eligibility
Sex/Gender
FEMALE
Age
18 Years to 30 Years
Healthy volunteers
Yes
Inclusion criteria
* Healthy * 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
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Rowing Test Time | 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 | 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. |
| Rowing Test Peak Heart Rate | 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 Average Heart Rate | 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 Peak Power Output | 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 |
| Rowing Test Average Power Output | 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 |
| Dietary Nitrate Habitual Consumption Amount | 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). |
| Dietary Nitrate Habitual Consumption Category | 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). |
Countries
United States
Outcome results
None listed