Study of energy demand in resistance exercise sessions with intensity, density and workload equal

• Grant number: 16/18572-9
• Support Opportunities: Regular Research Grants
• Start date: March 01, 2017
• End date: February 28, 2019
• Field of knowledge: Health Sciences - Physical Education
• Principal Investigator: Vilmar Baldissera
• Grantee: Vilmar Baldissera
• Host Institution: Centro de Ciências Biológicas e da Saúde (CCBS). Universidade Federal de São Carlos (UFSCAR). São Carlos , SP, Brazil

Abstract

For reasons of health, esthetics and/or performance, many people around the world have as a goal the reduction or maintenance of fat mass, thus one of the strategies employed in training programs is the increase in body energy demand, induced by exercise e controlled food ingestion. The exercises made against the resistance of the body itself or an external resistance is called resistance exercise (RE) or strength training. Currently there is portable equipment to indirectly quantify energy expenditure that allows some mobility during the gas analyses. These characteristics make this method efficient and viable in the analysis of energy demand during a complete RE session. The purposes of the study are: a) To verify the possibility of elaborating two RE training sessions with equated intensity, volume and density, but a different internal load; b) To compare the total energy demand (sets + recovery) during RE training sessions with equated intensity, volume and density, but a different internal load; To investigate and compare the mobilization of free fatty acids (FFA) and glycerol during two RE training sessions with equated intensity, volume and density, but a different internal load; d) To verify if there is an alteration in the recruitment pattern of muscle fibers through surface electromyography (sEMG); e) To compare the kinetics of blood creatine kinase (CK) after the two sessions of different internal loads. The study is to be underwent by 25 healthy male volunteers with over three months of RE practice, thus familiarized with the exercises employed on the study. Participants must be aged 18 to 35 years and have no diagnosis of any diseases that may compromise exercising. Volunteers will show at the Exercise Physiology laboratory of the Federal University of São Carlos three times. In the first visit a body composition evaluation will be made, as well as the application of the PAR-Q questionnaire and the performance of one repetition maximum (1RM) tests on the following exercises and in this described order: 45-angled leg press, smith bench press, smith half-squat, wide-grip frontal pulley, leg curls, triceps extension, knee extension and biceps curls. The following sessions, made randomly, will consist of (A) three sets of 1o repetitions at 70% of 1RM and 2-minute intervals and (B) six sets of 5 repetitions at 70% of 1RM and 1-minute intervals. The parameters analyzed will be total energy expenditure, sEMG, blood glucose concentration and blood creatine kinase kinetics. (AU)