Issn Print: 0195-9131
Publication Date: 1996/05/01
INFLUENCE OF FITNESS LEVEL ON THE RELATIVE INTENSITY FOR PEAK FAT UTILIZATION 85
V. J. Jackson; S. C. Glass
Excerpt
The purpose of this study was to determine the difference in relative intensity for peak fat utilization between high fit (HF) and low fit (LF) individuals. Twenty-four subjects (6 men, 18 women; age = 26.24 ± 10.70 y, ht = 171.59 ± 7.32 cm, mass = 76.77 ± 14.32 kg, fat = 21.89± 6.79%) were divided into HF groups (VO2peak Men > 45.0, Women > 40.0 ml·kg-1·min-1) and LF groups (VO2peak Men< 40.0, Women < 35.0 ml·kg-1·min-1). Subjects completed a maximal graded exercise test on a treadmill, and within 48h also completed a submaximal protocol. The submaximal protocol consisted of 3 min. stages, with 1.5 MET increments each stage. During the submaximal exercise VO2, RPE, RER and HR was measured. Total calorie expenditure and fat utilization was determined using RER values, VO2 and the Lusk table. Results showed that the HF group had a higher VO2peak (54.52 ± 10.58) than the LF group (30.60 ± 5.09; p < 0.05). Relative intensity for fat utilization did not differ between the HF (42.77 ± 20.14% VO2peak) and the LF (39.04 ± 6.69%) group. During the initial submaximal intensities absolute fat utilization did not differ between groups, however the HF group was able to exercise at significantly higher submaximal workrates than the LF group, and thus was able to expend more total calories and fat calories at a similar relative intensity. We conclude that fitness level does not influence the relative intensity for peak fat utilization, however HF individuals are better able to expend fat calories by exercising at a higher absolute intensity.
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