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Laboratory
5: Influence
of Exercise on Post-Exercise Glucose Disposal
Background: Researchers
use either the euglycemic hyperinsulinemic clamp or the oral glucose tolerance
test to assess the body's ability to dispose of blood glucose.
Of the two methods, the OGTT is the easiest to perform as it only
requires the ingestion of 75 gm of carbohydrate, followed by repeated blood
draws for two hours for the latter assay of blood (serum) glucose. Purpose: The
purpose of this lab is to compare the blood glucose response to 75 g of ingested glucose in one individual after
multiple conditions. One trial will require the ingestion of the CHO after cycle
ergometry (lower body only) exercise, whereas the second trial will involve
whole body resistance exercise training. If you desire, you may want to do
a third control trial involving 45 min of prior supine rest. The blood glucose response will be compared by determining
the area under the 1.5 hour blood glucose curve for each trial. Alternatively, create your own methodology for comparing how two conditions influence peripheral glucose disposal. Experimental
Procedures:
Glucose will be assayed by an enzymatic assay, as posted to the assay page. The kit purchased is from Sigma, and the specification sheet for this assay is linked here. Data
Analyses: *
Graph the changes in blood glucose for each trial. *
Determine the area under the curve for the post-exercise data of each
trial using Prism. *
Explain the blood glucose differences between trials, and predict how
insulin would be different for each trial. *
Use the term insulin sensitivity and glucose disposal to describe the
differences in the blood glucose response between the subjects. *
Why does exercise increase insulin sensitivity and glucose disposal? *
How does this response aid the diabetic and prevent diabetes? References Beard
J., R. Bergman, W. Ward and D. Porte. The insulin sensitivity index in
nondiabetic man: corerlation between clamp-derived and IVGTT-derived values.
Diabetes. 35:362-369, 1986. Seals
D., J. Hagberg, W. Allen, B. Hurley, G. Dalsky, A. Ehsani and J. Holloszy.
Glucose tolerance in young and older athletes and sedentary men. J. Appl.
Physiol. 56(6):1521-1525, 1984. Young
J., J. Enslin and B. Kuca. Exercise training and glucose tolerance in trained
and non-trained subjects. J. Appl. Physiol. 67(1):39-43, 1989.
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