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Effect of stimulus duration and recovery type on metabolic and cardiorrespiratory responses during and intermittent exercise performed at severe domain in active individuals

Grant number: 09/07700-2
Support Opportunities:Regular Research Grants
Duration: October 01, 2009 - September 30, 2011
Field of knowledge:Health Sciences - Physical Education
Principal Investigator:Camila Coelho Greco
Grantee:Camila Coelho Greco
Host Institution: Instituto de Biociências (IB). Universidade Estadual Paulista (UNESP). Campus de Rio Claro. Rio Claro , SP, Brazil

Abstract

The exercise domains (moderate, heavy and severe) are characterized by intensities ranges at which the behavior of blood lactate concentration ([La]) and oxygen uptake (VO2) throughout the exercise is similar. At the severe domain, [La] and VO2 don't present stabilization and the maximal oxygen uptake (VO2max) may be attained at the end of the exercise even at intensities bellow VO2max, by the VO2 slow component (SC), which emerges around 80-110 s after the beginning of the exercise. During intermittent exercise, the previous stimulus and the recovery type may accelerate the VO2 kinetics and anticipate the SC appearance. Thus, the manipulation of these variables and of the stimulus' duration may contribute for the attainment of VO2max during the exercise. With base on this information, the main objective of this study is to analyze and to compare the metabolic and cardiorrespiratory responses and the performance during an intermittent exercise in severe domain, at different conditions of stimulus' duration and recovery type, in active individuals. Healthy male subjects of 20-25 years will be divided into two groups (passive recovery - PR and active recovery - AR) and will be submitted to the following procedures: 1) progressive test until exhaustion in a cyclergometer with pedal cadence of 70 rpm, initial intensity of 1.5 W.kg-1 and increments of 0.5 W.kg-1 body mass at each 3 minutes; 2) constant workload test at 90%VO2max until exhaustion, to determine the moment of the beginning, the duration and the amplitude of the SC, and; 3) two intermittent tests performed in random order, one constituted by stimulus with duration corresponding to the moment of the beginning of SC (T1), and one with stimulus with duration established at the moment corresponding to the half of SC duration (T2), to determine the parameters of SC as mentioned in the procedure 2. Blood lactate response and the parameters of VO2 kinetics will be analyzed throughout the constant workload tests, to verify at which conditions VO2max is attained, how long it can be sustained and the possible modifications on the anaerobic and aerobic contributions during the exercise. (AU)

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
BARBOSA, LUIS F.; DENADAI, BENEDITO S.; GRECO, CAMILA C.. Endurance Performance during Severe-Intensity Intermittent Cycling: Effect of Exercise Duration and Recovery Type. FRONTIERS IN PHYSIOLOGY, v. 7, . (09/07700-2, 16/22907-6)

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