- 近畿大学教養・外国語教育センター紀要. 一般教養編 = Kinki university center for liberal arts and foreign language education journal. Liberal arts edition (ISSN:21857032)
- vol.1, no.1, pp.3-13, 2011-03-01
【Abstract】 The aims of the present study were to investigate characteristics of variations in substrate metabolism with time during prolonged exercise in trained women and to examine the optimal exercise intensity and duration of endurance training in women as exercise prescription. Expired gas was measured in ten trained women who performed 120-min treadmill walking and running at several exercise intensities. Substrate oxidation was computed by substituting determined oxygen uptake and carbon-dioxide output into stoichiometric equations. A constant level of energy expenditure was needed during prolonged exercise at the same intensity, but the enhancement of lipid metabolism with exercise duration led to an increase in fat-derived energy provision and a decrease in the dependency ratio of carbohydrate-derived energy to required energy. Lipid metabolism during low-intensity exercise wasconstantly-enhanced with duration whereas that during moderate- and high-intensity exercise was slowly increased beyond 60 min after initiating exercise and the proportion of fat-derived energy to required energy decreased with increasing exercise intensity. These findings suggest that women inendurance training should continue low-intensity exercise for as long time as possible and that they should select the moderate-intensity to sustain exercise beyond 60 min in order to increase the total volume of energy expenditure.