Honors College Thesis
 

The Relationship Between Percent Body Fat and Fat Metabolism During Moderate Exercise

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  • It has previously been shown that the proportion of fat metabolized during aerobic exercise is higher in trained subjects, and there is conflicting evidence as to whether or not gender or age influence fat utilization during exercise. PURPOSE: The primary objective of this study was to investigate whether body composition influenced fat utilization during exercise, using data from a larger study. METHOD: 80 participants were separated into groups by gender, age and fitness level. The younger group age frame was 18 to 24 years old, and the older group consisted of 38-44 year olds. Their body composition was measured by Bod Pod prior to running on the treadmill for 35 minutes. The respiratory exchange ratio (RER) was recorded during their last 30 minutes of the run, below their ventilatory threshold. The Pearson Product Moment correlation was determined between body fat percentages and RER of the participants in 11 different groupings: male/female, trained male (TM)/ untrained male (UTM), trained female (TF)/ untrained female (UTF), older male (OM)/ younger male (YM), older female (OF)/ younger female (YF), and all subjects. RESULTS: None of the correlations between percent body fat and RER was statistically significant except for the correlation in the younger trained and untrained male group (R=0.5053). DISCUSSION: The major finding of this study was that there was no consistent relationship between body fat percentages and fat metabolism during exercise.
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