Effect of Carbohydrate Consumption on Fatigue and Muscle Damage in Jiu-Jitsu Athletes

Not Applicable

Completed

• Conditions: Exercise-induced Muscle Damage; Fatigue
• Interventions: Dietary Supplement: Carbohydrate (maltodextrin); Other: Placebo

• Registration Number: NCT03203785
• Lead Sponsor: Federal University of Health Science of Porto Alegre

Brief Summary

The study is a randomized, double-blinded, placebo-controlled trial that will include the participation of 14 Jiu-Jitsu athletes between 18 and 33 years. The aim of the study is to evaluate the effects of carbohydrate consumption on fatigue and exercise-induced muscle damage in Jiu-Jitsu athletes.

Detailed Description

Brazilian Jiu-Jitsu (BJJ) is a sport characterized by intermittent high-intensity efforts separated by periods of low intensity. Muscular strength is considered one of the most important physical components to be developed, especially in the upper limbs through dynamic and static actions. The activities of high intensity (relation effort-pause) carried out by the upper and lower limbs during BJJ can induce muscle fatigue. In order to minimize the glycogen depletion and to guarantee the availability of energy substrate to the athlete during the physical exercise, the carbohydrate intake before moderate intensity exercises should be between 5-7 g / kg of weight / day. The intervention group will receive a 30g maltodextrin beverage and the placebo group a non-carbohydrate drink. There will be 3 combat simulations of 8 min each, with intervals of 10 min between fights. Athletes will be instructed to remain with their usual intake during the study. The outcomes will be: manual grip strength (dynamometer), upper limb strength (KGST), lower limb strength (vertical jump), subjective exertion perception (Borg scale), pain perception (Nilsson scale), blood markers of muscle damage (CK and LDH), lactate, and glycemia.

Study Timeline

• Study Start: 2017-06-26
• Study First Submitted: 2017-06-26
• Study First Submitted QC: 2017-06-28
• Study First Posted: 2017-06-29
• Primary Completion: 2017-12-31
• Study Completion: 2017-12-31
• Status Verified: 2019-01
• Last Update Submitted: 2019-01-15
• Last Update Posted: 2019-01-16

Recruitment & Eligibility

• Status: COMPLETED
• Sex: Male
• Target Recruitment: 14

Inclusion Criteria

• Compete in the categories of weight between 70kg and 88,3kg (weight classification from light to medium heavy, belonging to the bands purple to brown).
• Age between 18 and 33 years.
• Be training at least three times a week, minimum of 1,5 hours per day, for at least 3 consecutive months.
• Have not used anabolic steroids in the last 6 months during the study period.
• Do not use any type of dietary supplement in the last 3 months.
• Self-declared healthy individuals.

Exclusion Criteria

• Recent muscle injury (within the last 3 months) that compromises and / or impedes the performance of the exercise requested in the study.
• Be in a time of rapid weight loss (pre-competition).

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: CROSSOVER

Arm && Interventions

Group	Intervention	Description
Carbohydrate	Carbohydrate (maltodextrin)	30g of carbohydrate (maltodextrin) diluted in 300ml of water. Athletes will drink 100ml before and 100ml in the first and second interval between exercise.
Placebo	Placebo	300 ml of a non-caloric drink. Athletes will drink 100ml before and 100ml in the first and second interval between exercise.

Primary Outcome Measures

Name	Time	Method
change in upper limbs strength	Pre-exercise; at 2 intervals during exercise; 24hour and 48hour after exercise	Kimono Grip Strength Test

Secondary Outcome Measures

Name	Time	Method
change in glucose	Pre-exercise; at 2 intervals during exercise; immediatly post-exercise	fingertip blood measured by Accutrend® Active glucose-specific reagent tape
change in creatine kinase	Pre-exercise; immediatly post-exercise; 24hour and 48hour after exercise	3 ml of blood samples
change in lactate dehydrogenase	Pre-exercise; immediatly post-exercise; 24hour and 48hour after exercise	3 ml of blood samples
change in lactate	At 2 intervals during exercise; immediatly post-exercise	fingertip blood measured by Accutrend Plus.
change in lower limbs power	Pre-exercise; at 2 intervals during exercise; 24hour and 48hour after exercise	Horizontal Countermovement Jump
change in hand grip strength	Pre-exercise; at 2 intervals during exercise; 24hour and 48hour after exercise	Grip Strength Test

Trial Locations

Locations (1)

Gabriella B. Möller; 🇧🇷 Pôrto Alegre, Rio Grande Do Sul, Brazil