Acute Effects of Previous Carbohydrate Intake on Perceived Exertion and Muscle Strength in Jiu-jitsu Athletes

The study will be conducted at the "Team Base" training center, located in the western zone of Rio de Janeiro. All procedures were performed under standard conditions (temperature: 21-23 ° C, relative humidity: 40-60%). Participants were previously instructed not to perform vigorous exercise 24 hours prior to data collection and to fast 8 hours prior.

All procedures will be performed in one day. Before the study procedures, participants will be evaluated for anthropometric characteristics using a scale (GAMA ITALY® brand) and a portable stadiometer (Sanny® brand, Personal model). Then, manual palmar grip strength (FPM) will be measured in pre and post fight moments. And, after the fight will also be verified the participants' perception of effort through the adapted Borg scale.

Procedures Fights The struggles (Handori) began respecting the schedules stipulated between the components of the same group. Thus, each fight lasted five minutes, without intervals, where the athletes were instructed to perform dynamic movements, and maintain high movement, aiming to raise the intensity to the maximum during this period.

Carbohydrate Supplementation For the administration of carbohydrate supplementation, the "Advanced Nutrition®" pack containing 30g (1 sachet), energy of 83kcal = 349kJ, carbohydrates 21g, sodium 82mg, vitamin C 4, 2mg and vitamin E 0.90mg.

Palmar Manual Holding Force (FPM) Measurement of the Manual Holding Force (FPM) was performed using the JAMAR® analog hydraulic dynamometer (Asimow Engineering®, USA), with an accuracy of 0.5 kg / f and a maximum capacity of 100 kg / f. Thus, the position suggested by the American Society of Hand Therapists (ASHT) [8] was used, with the participants positioned in a seated position with their hips and knees at 90 ° flexion, shoulder in adduction, elbow flexed at 90 °, wrist and forearm in neutral position. The participant was instructed to perform the greatest possible force and the peak value was subsequently recorded.