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Completed

NCT Number: NCT06045845

Effects of Beet Juice and Diet in Female Rowers

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.

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Key information

Conditions

Dietary Habits Behavior Behavior, Animal Exercise Feeding Behavior Motor Activity Nitrates

Age range

18 year–30 year

Sex eligibility

Female

Study type

Interventional

Phase

Not applicable

Primary location

University of Kansas Rowing Boathouse

Lawrence, Kansas, 66044, United States

About this study

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.

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

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

Treatment and study plan

Beet Juice

Dietary Supplement

70 milliliter (70mL) standard Beet Juice (Beet It Sport Shot) consumed 2.5 hours before exercise test

Placebo

Dietary Supplement

70mL placebo Beet Juice (Beet It Sport Shot with nitrate removed) consumed 2.5 hours before exercise test

Primary outcomes

  1. 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.

  2. 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.

  3. 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.

  4. 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.

  5. 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

  6. 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

  7. 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).

  8. 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).

Sponsors and collaborators

Lead sponsor

University of Kansas Medical Center

Other

Registry information

Official study title

The Effects of Beetroot Supplementation and Habitual Dietary Nitrate Intake on Exercise Performance in Collegiate Female Rowing Athletes

Important dates

Study start
2023
Primary completion
2023
Study completion
2023
First posted
Sep 21, 2023
Registry last updated
Feb 2, 2024

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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