Oxygen consumption and substrate utilization during and after ...
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Oxygen consumption and substrate utilization during and after ...
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Original Research
Oxygen Consumption and Substrate Utilization During and After Resistance Exercises Performed with Different Muscle Mass PAULO FARINATTI‡1,2, ANTONIO G. CASTINHEIRAS NETO†2, and PAULO R.S. AMORIM‡3 1 Laboratory
of Physical Activity and Health Promotion/ State University of Rio de Janeiro, Rio de Janeiro, Brazil; 2 Salgado de Oliveira University, Niteroi, Brazil 3 Physical Education Department /Viçosa Federal University, Minas Gerais, Brazil *Denotes undergraduate student author, †Denotes graduate student author, ‡Denotes professional author
ABSTRACT International Journal of Exercise Science 9(1): 77-88, 2016. This study investigated the energy expenditure (EE) and substrate utilization reflected by the respiratory-exchange ratio (RER) during and after resistance exercises performed with different muscle mass. Ten male volunteers (mean±SD; 26±4yr, 179±6cm, 77±8kg) performed multiple sets of the horizontal leg press (LP) and chest fly (CF) (5 sets of 10 repetitions with 15 repetition-maximum, 1-minute between-set intervals) in a counterbalanced design. Oxygen uptake and carbon dioxide production were measured during 40 minutes of resting; resistance exercise protocols (sets and intervals); 90 minutes of postexercise recovery. Total fat and carbohydrate oxidation rates were calculated according to the nonprotein respiratory quotient. Both exercise conditions elicited net excess post-exercise oxygen consumption (EPOC) of similar duration (approximately 40min). The EPOC magnitude at 40 minutes was greater after LP than after CF (7.36±1.10L vs. 4.73±0.99L; P0.05) and lower than pre-exercise (Pre-exercise=0.78±0.04 vs. CF40min=0.74±0.04; CF90min=0.68±0.02 and LP50min=0.73±0.06; LP90min=0.65±0.04, P
