Efeito de uma sessão de exercício intervalado de alta intensidade e exercício contínuo de moderada intensidade sobre o tempo de prática de atividade física e comportamento sedentário de homens com obesidade

Abstract

INTRODUCTION: There is some evidence on literature that obese individuals placed under intense high volume physical training sessions have a tendency to reduce their level of usual physical activity and increase their sedentary behavior up to 6 days after the interventions. However, there is little know-how about the effects of high-intensity interval exercise (HIIE) with low volume and moderate-intensity continuous exercise (MICE) about regarding the level of physical activity and sedentary behavior in obese adults. OBJECTIVE: To compare the effects in a session of HIIE and MICE with low volume concerning physical activity in obese individuals. METHODS: Fourteen obese (BMI > 30 Kg/m2 < 39,9 Kg/m2 ) adult men (25-35 y/o) and physically inactive (< 150 min/week moderate-vigorous physical activity) participated in the study. Through a controlled and randomized clinic assay with delimitation, the individuals performed two exercise sessions (HIIE and MICE) and one control session with a week interval. The HIIE was done by 10 stimuli x 60 seconds with 90% of peak speed (Vpeak) reached in the incremental test and active recovery with 60 seconds and 30% of Vpeak. The MICE was performed with a correspondent intensity to approximately 70% of HR max calculated from the incremental test on a treadmill. Both sessions were 20 minutes long. After the exercise and control sessions, the accelerometer was inserted in the volunteers' hip, positioned on right side. The volunteers were instructed to use the accelerometer for seven consecutive days. The ANOVA two-way (conditions vs. time) with repeated measurements for the second factor was used to analyze possible differences on the usual physical activity level along seven days. RESULTS: There was no significate interaction condition vs time in the number of counts [F(12, 156) = 0,977, p = 0,473, η2 parcial = 0,07; HIIE: 217,4 ± 29,5; MICE: 203,4 ± 40,3; control: 203 ± 31,6], breaks [F(12, 940) = 0,556, p = 0,874, η2 parcial = 0,041; HIIE: 20,4 ± 2,4; MICE: 21,2 ± 2,8; control: 21,6 ± 2,9] and bouts [F(12, 816) = 0,425, p = 0,952, η2 parcial = 0,032; HIIE: 20,5 ± 2,2; ECMI: 20,5 ± 3,1; control: 21,7 ± 2,8], time spent on sedentary behavior [F(12, 156) = 1,404, p = 0,169, η2 parcial = 0,097]; HIIE: 750 ± 109 min; ECMI: 773,1 ± 119,9 min; control: 814,7 ± 149,2 min], light physical activity [F(12,156) = 0,647, p = 0,80, η2 parcial = 0,047]; HIIE: 27,5 ± 27,3 min; MICE: 288 ± 27 min; control: 284,1 ± 25 min], moderate [F(12, 156) = 0,821, p = 0,629, η2 parcial = 0,059]; HIIE: 19,7 ± 3 min; MICE: 18,4 ± 5,5 min; control: 15,3 ± 2,3 min] and vigorous [F(12, 156) = 1,692, p = 0,073, η2 parcial = 0,115]; HIIE: 0,7 ± 0,8 min; ECMI: 0,4 ± 0,4 min; control: 0,3 ± 0,4 min] along seven days. CONCLUSION: A HIIE session with low volume and MICE did not altered the level of the physical activity and sedentary behavior in obese men.