Effects of Beet Juice and Diet in Female Rowers

Sponsor

University of Kansas Medical Center (Other)

Overall Status

Not yet recruiting

CT.gov ID

NCT06045845

Collaborator

(none)

Enrollment

Arms

Anticipated Duration (Months)

Study Details

Study Description

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.

Condition or Disease	Intervention/Treatment	Phase
Dietary Habits Nitrates Exercise	Dietary Supplement: Beet Juice Dietary Supplement: Placebo	N/A

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

Anticipated Enrollment :

30 participants

Allocation:

Randomized

Intervention Model:

Crossover Assignment

Masking:

Triple (Participant, Investigator, Outcomes Assessor)

Primary Purpose:

Supportive Care

Official Title:

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

Anticipated Study Start Date :

Sep 1, 2023

Anticipated Primary Completion Date :

Nov 1, 2023

Anticipated Study Completion Date :

Nov 1, 2023

Arms and Interventions

Arm	Intervention/Treatment
Experimental: Standard Beet Juice First First Test: Beet Juice / Second Test: Placebo	Dietary Supplement: Beet Juice 70 milliliter (70mL) standard Beet Juice (Beet It Sport Shot) consumed 2.5 hours before exercise test Dietary Supplement: Placebo 70mL placebo Beet Juice (Beet It Sport Shot with nitrate removed) consumed 2.5 hours before exercise test
Experimental: Placebo Beet Juice First First Test: Placebo / Second Test: Beet Juice	Dietary Supplement: Beet Juice 70 milliliter (70mL) standard Beet Juice (Beet It Sport Shot) consumed 2.5 hours before exercise test Dietary Supplement: Placebo 70mL placebo Beet Juice (Beet It Sport Shot with nitrate removed) consumed 2.5 hours before exercise test

Arm

Intervention/Treatment

Experimental: Standard Beet Juice First

First Test: Beet Juice / Second Test: Placebo

Dietary Supplement: Beet Juice

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

Dietary Supplement: Placebo

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

Experimental: Placebo Beet Juice First

First Test: Placebo / Second Test: Beet Juice

Dietary Supplement: Beet Juice

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

Dietary Supplement: Placebo

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

Outcome Measures

Primary Outcome Measures

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).

Eligibility Criteria

Criteria

Ages Eligible for Study:

18 Years to 30 Years

Sexes Eligible for Study:

Female

Accepts 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