Title page for ETD etd-09182008-063227
|Type of Document
||Fritsch, LeaAnn Thompson
||Effects of chronic suboptimal energy intake on constant-load exercise in young women
||Master of Science
||Human Nutrition, Foods, and Exercise
|Davis, Shala E.
|Sebolt, Don R.
|Thomas, Elizabeth A.
- resting metabolic rate
- suboptimal energy intake
|Date of Defense
The physiologic and metabolic effects of chronic consumption of energy
below recommended levels on constant-load exercise was studied in women
age 19-24 years. Ten controls (average caloric intake ~ 35 kcal/kg body
weight) and 10 subjects with suboptimal energy intake (average caloric intake -
25 kcal/kg body weight) were matched for age, exercise caloric expenditure and
percentage of HB-predicted RMR. Subjects (n=20) completed a maximal
incremental cycle ergometer test and a 30-minute cycle ergometer test at 75 %
of peak oxygen consumption. Although both groups presented a significant
increase in ventilation (VE) over time of exercise, the rate of change in VE and
end-exercise VE value was significantly greater, F (1 J 18) = 5.63, P < .05, for the
suboptimal energy intake group than for the controls. Although not statistically
significant (p = 0.454), heart rate (HR) tended to be continuously higher for the
suboptimal energy intake group than the control group during the constant-load
cycle test. Peripheral ratings of perceived exertion (RPE-L) also tended to be
higher for the suboptimal energy intake group at the end of constant-load
exercise, however, not significantly (p = 0.072). Two subjects in the suboptimal
energy intake group failed to cornplete the 30-minute submaximal constant-load
cycle test; one completed 15 minutes and the other 20 minutes. All subjects in
the control group completed the entire submaximal constant-load test (30
minutes). These results suggest that women with chronic suboptimal energy
intake have increased difficulty tolerating moderate intensity exercise for 30
minutes (an intensity and duration that mimics a typical exercise session).
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