Glucose Intolerance Clinical Trial
Official title:
Control of Postprandial Glycemia: the Roles of Diet and Exercise
Specific aims of the study are:
1. to evaluate whether a 24-h exposure to a 25%-carbohydrate diet will reduce postprandial
glycemia to the same extent in the evening (19 h) as in the morning (7 h),. and
2. to determine whether one hour of post-meal moderate intensity exercise (at 50% of
maximal effort) will further reduce postprandial glycemia.
The outcome measures are: plasma concentrations of glucose, insulin,
glucose-dependent-insulinotropic peptide (GIP), leptin, and the ketone body
beta-hydroxybutyrate.
The two hypotheses in this study are:
1. A 24-h exposure to a 25%-carbohydrate diet will reduce postprandial glycemia to the same
extent in the evening (19 h) as in the morning (7 h), and
2. One hour of moderate-intensity exercise (at 50% of maximal effort) will further reduce
postprandial glycemia to the same extent in the evening (19 h) as in the morning (7 h).
Eight postmenopausal subjects (age 58.5 years, BMI 25.6 kg/m2) participated in 4 24-h long
crossover trials, two terminating at 7h and the other 2 at 19h. At each circadian time one
trial required 60 minutes of moderate-intensity exercise (50% of maximal effort), and the
other two involved no exercise.
Three 25%-carbohydrate meals prepared by the Michigan Clinical Research Unit (MCRU) kitchen,
were eaten at subjects' home, and the fourth was eaten 20 minutes after subjects' arrival at
MCRU at either 19 h or 7 h. Blood was collected from antecubital catheter at 10-minute
intervals until 23:20 h or 11:20 h, respectively.Plasma was treated with protease inhibitor
to preserve GIP, frozen at -80o C until glucose measurements by glucose oxidase, hormone
measurements by chemiluminescence, and ketone measurements by Abbott meter strips.
Exercise intensity was determined before the exercise trials on a treadmill from oxygen
consumption (VO2) and carbon dioxide production (VCO2) by subjects walking on a treadmill at
3 mph with the treadmill slope increased by 2% every 3 minutes. Maximal effort was
established when respiratory exchange ratio (VCO2/VO2) reached or exceeded 1. The treadmill
speed and slope at half maximal effort was used during the one-hour exercise bout which was
initiated 40 minutes after the start of the meal.
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