Date Approved


Graduate Degree Type


Degree Name

Physical Therapy (M.S.)

Degree Program

Physical Therapy


The purpose of this study was to compare the effect of natural and refined sugar at an instantaneous, pre-absorptive level on quadriceps peak torque and to measure any prolonged effect on normal, healthy subjects. The experimental group (n=40) was randomly assigned to sugar testing order, with refined sugar testing occurring on one day and natural sugar testing occurring on the opposite day. The control group (n=10) followed the same protocol but held distilled water in their mouth. Isokinetic peak torque was recorded for each subject at three intervals, pretest, post-test I (~1 min.), and posttest n (-15 min.). Results showed that neither the sugars nor the placebo had a significant effect on peak torque in under one minute. However, both sugars produced a significant decrease (p<0.05) in peak torque at the fifteen-minute interval, while the placebo did not. The authors concluded that both natural and refined sugar had a negative effect on peak torque approximately fifteen minutes after its administration.


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