The Influence of Relative Exercise Intensity on Substrate Use
Cardiff Metropolitan University
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The purpose of the present study was to examine the physiological and metabolic responses to two different submaximal exercise scenarios which equated to the same total amount of work done. The specific focus of the study was to examine the influence of relative exercise intensity on substrate use and energy expenditure. Eight healthy physically active males completed a 60 min and 30 min submaximal exercise test using cycle ergometry at 25% and 50% peak aerobic power. The individual exercise intensities were calculated following a preliminary peak oxygen uptake (VO2peak) test. Respiratory parameters were recorded during all exercise tests to allow for calculation of energy expenditure (EE) as well as the proportional use of fat and carbohydrate (CHO) metabolism. Statistical analysis revealed that heart rate (HR), oxygen consumption (VO2), respiratory exchange ratio (RER), EE and fat metabolism were different between protocols. No difference in CHO metabolism was observed between protocols. An increase in fat metabolism and a decrease in CHO metabolism was observed as each protocol progressed.
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