Acute effects of beetroot juice supplementation on judo performance

Acute effects of beetroot juice supplementation on the Special Judo Fitness Test performance in judokas: a randomized double-blinded crossover trial

Status

Active, not recruiting

Phases

Phase 3

Study type

Interventional

Source

IRCT

Registry ID

IRCT20231004059615N3

Enrollment

Registered

2025-05-22

Start date

2025-05-22

Completion date

Unknown

Last updated

2026-06-01

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Improve exercise performance.

Interventions

Intervention 1: Intervention group: Beetroot juice supplement (140 ml, containing approximately 12.8 mmol nitrate) in opaque bottles will be consumed 2 hours before exercise. Commercial beetroot juice

James White Drinks Ltd., Ipswich, UK) will be used in this study. Intervention 2: Placebo (140 ml) will be consumed 2 hours before exercise in opaque bottles. Commercial nitrate-depleted beetroot juic

Eligibility

Sex/Gender

All

Age

20 Years to 30 Years

Inclusion criteria

Inclusion criteria: Having at least a Purple Belt in Judo Free from neuromuscular and musculoskeletal disorders Non-smokers Non-alcoholic Not consumers of medicine

Exclusion criteria

Exclusion criteria: Having any injuries or pain Inability to perform tests

Design outcomes

Primary

Measure	Time frame
SJFT index. Timepoint: ?After SJFT. Method of measurement: Using the following formula: SJFT index = HR0 + HR1 / total number of throws.	—

Secondary

Measure	Time frame
Rate of perceived exertion. Timepoint: Following SJFT. Method of measurement: Using the Borg scale.;Number of throws. Timepoint: During the SJFT. Method of measurement: Counting the number.;Heart rate. Timepoint: Immediately at the end of SJFT and 1 minute after SJFT. Method of measurement: Using a Polar heart rate monitor.;Plasma nitrate concentration. Timepoint: At baseline, pre-test, and post-test (5 minutes after exercise). Method of measurement: By high-performance liquid chromatography method (ENO-20; EiCom, Kyoto, Japan).;Plasma nitrite concentration. Timepoint: At baseline, pre-test, and post-test (5 minutes after exercise). Method of measurement: By high-performance liquid chromatography method (ENO-20; EiCom, Kyoto, Japan).;Plasmalactate. Timepoint: At baseline, pre-test, and post-test (5 minutes after exercise). Method of measurement: Using a lactate ELISA kit.;Muscle oxygenation. Timepoint: During the SJFT. Method of measurement: Near-infrared spectroscopy.	—

Measure

Time frame

Rate of perceived exertion. Timepoint: Following SJFT. Method of measurement: Using the Borg scale.;Number of throws. Timepoint: During the SJFT. Method of measurement: Counting the number.;Heart rate. Timepoint: Immediately at the end of SJFT and 1 minute after SJFT. Method of measurement: Using a Polar heart rate monitor.;Plasma nitrate concentration. Timepoint: At baseline, pre-test, and post-test (5 minutes after exercise). Method of measurement: By high-performance liquid chromatography method (ENO-20; EiCom, Kyoto, Japan).;Plasma nitrite concentration. Timepoint: At baseline, pre-test, and post-test (5 minutes after exercise). Method of measurement: By high-performance liquid chromatography method (ENO-20; EiCom, Kyoto, Japan).;Plasmalactate. Timepoint: At baseline, pre-test, and post-test (5 minutes after exercise). Method of measurement: Using a lactate ELISA kit.;Muscle oxygenation. Timepoint: During the SJFT. Method of measurement: Near-infrared spectroscopy.

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Countries

Turkey

Contacts

Public ContactDavar Khodadadi

Islamic Azad University

davar.khodadadi@yahoo.com+98 21 2263 3583

Outcome results

None listed

Source: IRCT (via WHO ICTRP) · Data processed: Jun 11, 2026