Exercise-induced Muscle Damage, Fatigue
Conditions
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.
Interventions
DIETARY_SUPPLEMENTCarbohydrate (maltodextrin)
maltodextrin flavored
OTHERPlacebo
non-caloric drink
Sponsors
Federal University of Health Science of Porto Alegre
Study design
Allocation
RANDOMIZED
Intervention model
CROSSOVER
Primary purpose
DIAGNOSTIC
Masking
TRIPLE (Subject, Investigator, Outcomes Assessor)
Eligibility
Sex/Gender
MALE
Age
18 Years to 33 Years
Healthy volunteers
Yes
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).
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| change in upper limbs strength | Pre-exercise; at 2 intervals during exercise; 24hour and 48hour after exercise | Kimono Grip Strength Test |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| change in hand grip strength | Pre-exercise; at 2 intervals during exercise; 24hour and 48hour after exercise | Grip Strength Test |
| change in creatine kinase | Pre-exercise; immediatly post-exercise; 24hour and 48hour after exercise | 3 ml of blood samples |
| change in lower limbs power | Pre-exercise; at 2 intervals during exercise; 24hour and 48hour after exercise | Horizontal Countermovement Jump |
| change in lactate | At 2 intervals during exercise; immediatly post-exercise | fingertip blood measured by Accutrend Plus. |
| change in lactate dehydrogenase | Pre-exercise; immediatly post-exercise; 24hour and 48hour after exercise | 3 ml of blood samples |
| change in glucose | Pre-exercise; at 2 intervals during exercise; immediatly post-exercise | fingertip blood measured by Accutrend® Active glucose-specific reagent tape |
Countries
Brazil
Outcome results
None listed