]>
IRCT20231004059615N5 IRCT 2025-07-18 INTERNATIONAL SCIENCE AND TECHNOLOGY UNIVERSITY Effect of caffeine and beetroot juice supplementation on specific judo performance The effect of caffeine and beetroot juice supplementation on specific judo performance during simulated competition-day conditions in judo athletes 2025-07-23 anticipated 24 Complete https://irct.ir/trial/84708 interventional Randomization: Randomized, Blinding: Double blinded, Placebo: Used, Assignment: Crossover, Purpose: Other, Randomization description: The names of the subjects will be entered in one column of Excel; in another column, each subject will be randomly assigned a number using the RAND function (=RAND()); then, the numbers will be sorted from smallest to largest; 25% of the subjects will receive Intervention 1 (caffeine supplement), 25% of the subjects will receive Intervention 2 (beetroot juice supplement), 25% of the subjects will receive Intervention 3 (caffeine + beetroot juice), and the remaining 25% will receive placebo. In the second to fourth sessions of the experiment, the subjects will be switched (for example, subjects who received Intervention 1 in the first session will be randomly assigned to Intervention 2, 3, or placebo in the second session), Blinding description: The order in which the beetroot juice supplement or placebo was administered will be determined by one outside the study and will not be disclosed to participants or researchers until after the data analysis. Participants will also receive the supplements and placebo in a capsule (caffeine) and a bottle (beetroot juice) that are opaque and look similar. In addition, the color and taste of the placebo will be simulated by adding food coloring and flavoring to the supplement. 3 Improve exercise performance. Intervention 1: Intervention group1: Beetroot juice supplement (BEET It Sport®; James White Drinks Ltd., Ipswich, UK); 2 days before the test: 2 servings, 70 ml each, containing approximately 6.4 mmol nitrate;1 day before the test: 2 servings, 70 ml each, containing approximately 6.4 mmol nitrate;Test day: 2 servings, 2 hours before the test and after the second randori, 70 ml, containing approximately 6.4 mmol nitrate. Intervention 2: Intervention group 2: Caffeine supplement (Caffeine®, Olimp Laboratories, Poland); Test day: 3 servings, 1 hour before the test and after the second and fourth attempts, 2 mg/kg body weight each. Intervention 3: Intervention group 3: Beetroot juice supplement (BEET It Sport®; James White Drinks Ltd., Ipswich, UK); 2 days before the test: 2 servings, each 70 ml, containing approximately 6.4 mmol nitrate; 1 day before the test: 2 servings, each 70 ml, containing approximately 6.4 mmol nitrate; Test day: 2 servings, 2 hours before the test and after the second attempt, 70 ml, containing approximately 6.4 mmol nitrate. Caffeine supplement (Caffeine®, Olimp Laboratories, Poland); Test day: 3 servings, 1 hour before the test and after the second and fourth attempts, 2 mg/kg body weight each. Intervention 4: Control group: Similar to the intervention condition, they will receive placebo (colored water instead of beetroot juice and a capsule containing cellulose instead of caffeine). Yes - There is a plan to make this available What will be shared: All data collected during the study will be shareable after de-identifying the subjects. When: The data will be published after the extracted articles are accepted. To whom: All people Conditions: All data collected during the study will be shareable after de-identifying the subjects. The requester will only be permitted to use the data for meta-analysis reviews. Where to obtain: Corresponding author: Davar Khodadadi, Faculty of Physical Education and Sports Sciences, Islamic Azad University Central Tehran Branch, Tehran, Iran Email: davar.khodadadi@yahoo.com How to obtain: Sending an email request to the corresponding author: Davar Khodadadi Email: davar.khodadadi@yahoo.com Comments:
public Davar Khodadadi
Faculty of Physical Education and Sports Sciences, Velayat University Complex, Shahid Sohani St., Sohank
Tehran Iran (Islamic Republic of) 1955847781 +98 21 2263 3583 davar.khodadadi@yahoo.com Islamic Azad University scientific Davar Khodadadi
Faculty of Physical Education and Sports Sciences, Velayat University Complex, Shahid Sohani St., Sohank
Tehran Iran (Islamic Republic of) 1955847781 +98 21 2263 3583 davar.khodadadi@yahoo.com Islamic Azad University Turkey All male judokas between the ages of 18 and 30. Have a training history of more than 5 years. Have at least a brown belt in judo. Do not smoke. Do not drink alcohol. Have a daily caffeine intake of less than 100 mg. 18 years 30 years Both Have any illness or injury in the past 3 months Take any medication or nutritional supplement in the past 3 months Other Other Other Other Intervention group1: Beetroot juice supplement (BEET It Sport®; James White Drinks Ltd., Ipswich, UK); 2 days before the test: 2 servings, 70 ml each, containing approximately 6.4 mmol nitrate;1 day before the test: 2 servings, 70 ml each, containing approximately 6.4 mmol nitrate;Test day: 2 servings, 2 hours before the test and after the second randori, 70 ml, containing approximately 6.4 mmol nitrate. Intervention group 2: Caffeine supplement (Caffeine®, Olimp Laboratories, Poland); Test day: 3 servings, 1 hour before the test and after the second and fourth attempts, 2 mg/kg body weight each. Intervention group 3: Beetroot juice supplement (BEET It Sport®; James White Drinks Ltd., Ipswich, UK); 2 days before the test: 2 servings, each 70 ml, containing approximately 6.4 mmol nitrate; 1 day before the test: 2 servings, each 70 ml, containing approximately 6.4 mmol nitrate; Test day: 2 servings, 2 hours before the test and after the second attempt, 70 ml, containing approximately 6.4 mmol nitrate. Caffeine supplement (Caffeine®, Olimp Laboratories, Poland); Test day: 3 servings, 1 hour before the test and after the second and fourth attempts, 2 mg/kg body weight each Control group: Similar to the intervention condition, they will receive placebo (colored water instead of beetroot juice and a capsule containing cellulose instead of caffeine). SJFT index. Timepoint: In the 6 stages after judo randori. Method of measurement: Using the following formula: SJFT index = HR0 + HR1 / total number of throws. Cognitive function. Timepoint: At baseline and after SJFT. Method of measurement: Using the Psychomotor Vigilance Test. Number of throws. Timepoint: In the 6 stages after SJFT. Method of measurement: Counting the number. Heart rate. Timepoint: In the 6 stages immediately at the end of SJFT and 1 minute after SJFT. Method of measurement: Using a Polar heart rate monitor. Rate of perceived exertion. Timepoint: In the 6 stages after SJFT. Method of measurement: Using the Borg scale. Jump height. Timepoint: In the 6 stages (pre-exercise and after SJFT). Method of measurement: CMJ Test. Muscular strength. Timepoint: In the 6 stages (pre-exercise and after SJFT). Method of measurement: Isometric strength testing device for hand muscles. Blood lactate. Timepoint: At baseline, pre-exercise, mid-exercise, pre-final SJFT and post-exercise. Method of measurement: Via Enzyme-Linked Immunosorbent Assay. Muscle oxygenation. Timepoint: During the final SJFT. Method of measurement: Near-infrared spectroscopy. Blood glucose. Timepoint: At baseline, pre-exercise, mid-exercise, pre-final SJFT and post-exercise. Method of measurement: Via hexokinase method. Plasma nitrate and nitrite. Timepoint: At baseline, pre-exercise, mid-exercise, pre-final SJFT and post-exercise. Method of measurement: Via chemiluminescence assay. Blood caffeine. Timepoint: At baseline, pre-exercise, mid-exercise, pre-final SJFT and post-exercise. Method of measurement: Via High-Performance Liquid Chromatography. Blood PH. Timepoint: At baseline and post-exercise. Method of measurement: Blood gas analyzer. INTERNATIONAL SCIENCE AND TECHNOLOGY UNIVERSITY Approved 2025-07-03 Ethics Committee of the International Science and Technology University Tunahan Mah. Dumlupinar 30 Agustos Cad. No:2, Metromal Business F Blok Office Ankara Ankara Turkey