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Completed

NCT Number: NCT05470231

Effect of Beet Juice on Elite Swimmers.

Objective: To investigate whether an acute intake of Beetroot Juice (BJ) improved performance factors in a repeated swimming effort at maximum speed in elite swimmers.

Methods: A total of 13 elite swimmers (6 girls and 7 boys) participated in this randomised, double-blind study. In 2 different trials, the swimmers ingested an injection of Beet-It (70 ml placebo (PL) or an injection of Beet-It 70 ml beetroot juice (BJ)) 3 hours before undergoing a 6x100m crawl intermittent maximal speed performance test.

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Key information

Conditions

ergogéniques

Age range

18 year–25 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

Universidad Francisco de Vitoria

Madrid, Pozuelo de Alarcón, 28223, Spain

Who can participate

Healthy volunteers accepted: No

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

Inclusion criteria

  • national and international level swimmers
  • healthy swimmers
  • no breakfast
  • 48 hours with restricted diet of: other sports supplements and beetroot-rich foods

Exclusion criteria

  • be on medication
  • having had breakfast
  • have brushed your teeth

Treatment and study plan

Beetroot juice

Dietary Supplement

The swimmers drank 3 hours before the test, mL70 of BJ (containing mmol6.4 of NO-3) (Beet-It-Pro Elite Shot, James White Drinks Ltd., Ipswich, UK) or PLA (0.04 mmol of NO-3)

Primary outcomes

  1. Lactate concentration

    Time frame: 3 hours post-dose of Beetroot juice or Placebo

    After the swimmers exited the water, their finger was wiped dry and their blood lactate concentration was measured with a portable Lactate Pro2 analyzer 1 minute after completing each 100-meter set.

  2. Rate of Perceived Exertion

    Time frame: 3 hours after ingestion of the beetroot juice

    During the break between 100 and 100, they were asked how hard the effort had been using the subjective RPE scale as in other studies with BJ and swimming.

  3. Recovery Total Quality Scale

    Time frame: 3 hours after ingestion of the beetroot juice

    Just before these same swimmers performed the next 100, they were asked how recovered they felt, using another subjective TQR scale

  4. Total Time

    Time frame: 3 hours after ingestion of the beetroot juice

    The complete 6x100 main test was recorded with a JVC model GY-HM150E video camera placed on the stand of the facility itself at about 10 m from the start/turn wall (approximately 5 m above and 10 m from the swim lane) to record the entire session. The recording of the session made it possible to calculate the total times, with the program KINOVEA 0.9.5.

  5. Parcial Time

    Time frame: 3 hours after ingestion of the beetroot juice

    The complete 6x100 main test was recorded with a JVC model GY-HM150E video camera placed on the stand of the facility itself at about 10 m from the start/turn wall (approximately 5 m above and 10 m from the swim lane) to record the entire session. The recording of the session made it possible to calculate the split times, with the KINOVEA 0.9.5 program.

  6. Counter Movement Jump

    Time frame: 3 hours after ingestion of the beetroot juice

    Swimmers completed three repetitions of CMJ with hands on waist using an infrared jumping system (Optojump Next, Microgate, Bolzano, Italy)

Secondary outcomes

  1. Stroke rate

    Time frame: from the day of randomization to the last day of the intervention: up to day 18

    The complete 6x100 main test was recorded with a JVC model GY-HM150E video camera placed on the stand of the facility itself at about 10 m from the start/turn wall (approximately 5 m above and 10 m from the swim lane) to record the entire session. The recording of the session made it possible to calculate the stroke rate, with the KINOVEA 0.9.5 program.

  2. Underwater distance

    Time frame: from the day of randomization to the last day of the intervention: up to day 18

    The complete 6x100 main test was recorded with a JVC model GY-HM150E video camera placed on the stand of the facility itself at about 10 m from the start/turn wall (approximately 5 m above and 10 m from the swim lane) to record the entire session. The recording of the session made it possible to calculate the distances of the underwater swim at the start and the second turn, with the program KINOVEA 0.9.5.

  3. Underwater time

    Time frame: from the day of randomization to the last day of the intervention: up to day 18

    The complete 6x100 main test was recorded with a JVC model GY-HM150E video camera placed on the stand of the facility itself at about 10 m from the start/turn wall (approximately 5 m above and 10 m from the swim lane) to record the entire session. The recording of the session made it possible to calculate the underwater time, with the KINOVEA 0.9.5 program.

Sponsors and collaborators

Lead sponsor

Universidad Francisco de Vitoria

Other

Collaborators

  • Universidad Politecnica de Madrid

Registry information

Official study title

Effects of Beetroot Juice Intake on Repeated Performance of Elite Swimmers. A Randomized Controlled Study

Important dates

Study start
2020
Primary completion
2020
Study completion
2020
First posted
Jul 22, 2022
Registry last updated
Jul 22, 2022

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.