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Completed

NCT Number: NCT06073275

Effects of Beetroot Juice Intake on Performance and Physiological Parameters

This study was a randomized, double-blind, crossover design for 3 weeks. In the first week, a researcher explained all the experimental procedures to the participants. In the following two weeks, the participants attended the Exercise Physiology laboratory to be assessed in 2 rowing ergometer sessions, separated from each other by a washout period of 7 days, under the same environmental conditions.

In both strictly identical sessions, the participants randomly ingested beetroot juice (BRJ) or placebo (PL) 3 hours before the start of the tests.

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Key information

Conditions

Pulmonary Function Nutrition, Healthy

Age range

30 year and older

Sex eligibility

Male

Study type

Interventional

Phase

Not applicable

Primary location

Campus Docent Sant Joan de Déu. Universitat de Barcelona

Sant Boi de Llobregat, Barcelona, 08830, Spain

About this study

Three hours after BRJ or PL intake, the participants began the 2,000-meter rowing ergometer test. Before starting (pretest) and at the end of the tests (posttest), blood oxygen saturation, rating of perceived exertion (RPE), and blood lactate measurements were taken. During the rowing ergometer tests, performance parameters and cardiorespiratory variables were recorded.

Who can participate

Healthy volunteers accepted: Yes

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

Inclusion criteria

  • national and/or international level;
  • without cardiovascular, respiratory, metabolic, neurological or orthopedic disorders that may affect the performance of the rowing ergometer test;
  • no consumption of drugs or medicines;
  • no smoking;
  • Informed consent to participate in the study signed by all rowers

Exclusion criteria

  • Ingestion of nutritional supplements taken in the three months prior to the start of the study;
  • no following the guidelines established by the nutrition professional.

Treatment and study plan

Beetroot juice ingestion

Dietary Supplement

Beetroot juice ingestion was randomly administered 3 h before the start of the test to the participants in two assessment sessions with a one-week washout between both sessions.

Placebo ingestion

Dietary Supplement

Placebo ingestion was randomly administered 3 h before the start of the test to the participants in two assessment sessions with a one-week washout between both sessions.

Primary outcomes

  1. Rowing performance: Time trial

    Time frame: through study completion, an average of 3 weeks

    minutes:seconds (mm:ss)

  2. Rowing performance: Mean Power output

    Time frame: through study completion, an average of 3 weeks

    Watts

  3. Rowing performance: meter per stroke

    Time frame: through study completion, an average of 3 weeks

    Meters

  4. Cardiorespiratory performance: absolute oxygen uptake

    Time frame: through study completion, an average of 3 weeks

    V̇O2max (L/min)

  5. Cardiorespiratory performance: relative oxygen uptake

    Time frame: through study completion, an average of 3 weeks

    V̇O2max (mL/kg/min)

  6. Cardiorespiratory performance: ventilatory efficiency

    Time frame: through study completion, an average of 3 weeks

    slope of Ventilation/Carbon dioxide production

  7. Metabolic performance: lactate

    Time frame: through study completion, an average of 3 weeks

    mmol/L

Secondary outcomes

  1. Cardiorespiratory performance: Maximum heart rate

    Time frame: through study completion, an average of 3 weeks

    beats/min

  2. Cardiorespiratory performance: Mean heart rate

    Time frame: through study completion, an average of 3 weeks

    beats/min

  3. Saturation

    Time frame: through study completion, an average of 3 weeks

    percentage

  4. Cardiorespiratory performance: minute ventilation

    Time frame: through study completion, an average of 3 weeks

    minute ventilation in L/min

  5. Scale of Perceived exertion ratio (RPE)

    Time frame: through study completion, an average of 3 weeks

    Scale from 0 to 10. 0 = rest; 10 = maximum effort

  6. Rowing performance: strokes

    Time frame: through study completion, an average of 3 weeks

    Mean strokes per minute

Sponsors and collaborators

Lead sponsor

Campus docent Sant Joan de Déu-Universitat de Barcelona

Other

Registry information

Official study title

Effects of Acute Beetroot Juice Intake on Performance, Maximal Oxygen Uptake, and Ventilatory Efficiency in Well-trained Master Rowers: A Randomized, Double-blinded Crossover Study

Important dates

Study start
2018
Primary completion
2019
Study completion
2019
First posted
Oct 10, 2023
Registry last updated
Oct 10, 2023

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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