Armaghane Danesh Bimonthly Journal (Oct 2020)
Metabolic Rate and Lipid Oxidation During and After Intense Intermittent Activity in Active Male Students
Abstract
Background & aim: Considering the role of blood flow restriction in causing more hemodynamic stress and its possible effect on increasing the metabolism rate and fat oxidation in the recovery period, the aim of the present study was to investigate the effect of blood flow restriction on the metabolic rate and substrate oxidation during and after high-intensity intermittent exercise(HIIE) in male active students. Methods: The present study was a quasi-experimental cross-sectional study. The statistical sample of the present study were 10 active male students who were voluntarily selected and randomly assigned to a cross-sectional research project in two groups of intermittent rapid activity with and without blood flow restriction. The intermittent speed exercise program consisted of four 30-second Winggit tests (with a working load of 75gr/kg body weight) performed at a 5-minute break. To restrict blood flow, their systolic and diastolic blood pressure was measured in a separate session using a digital sphygmomanometer and hip circumference using a tape measure. At that point, by placing the obtained values in the formula (femoral artery occlusion), the occlusion point of blood flow was determined. In conditions of restricted blood flow only during the tests, the blood flow around the thigh was restricted by an elastic band up to 40% of the occlusion point. 5 minutes before, during the performance and 30 minutes after the activity, the volume of oxygen consumption and carbon dioxide produced by the subjects were collected in a breath-by-breath manner per liter per minute by a respiratory gas analyzer. Repeated analysis of variance test was used for statistical analysis of data. Results: According to the results, no significant differences were observed between the two groups of the studied variables. Although, restriction of blood flow significantly increased oxygen consumption during(p=0.0001) and after HIIE(p=0.045), however, fat utilization Increased only after HIIE(p=0.002). Conclusion: Given the higher oxygen consumption and energy expenditure in the post-workout period in the restricted blood group, this intervention may be useful for people seeking to lose or control weight if used over a longer period.
