Several previous studies have shown that repeatedly ingesting carbohydrate supplements during exercise training sessions, over a period of days and weeks, can gradually increase carbohydrate oxidation and reduce gut discomfort during exercise. However, repeatedly ingesting large amounts of carbohydrate during training sessions can be burdensome and can cause gut distress. Thus, it would be advantageous if the same long-term benefits could be realized from consuming these carbohydrate supplements at rest instead of specifically during training sessions. Therefore, the goal of this study is to examine whether repeatedly ingesting a carbohydrate-rich beverage at rest over a 5-day period alters metabolism and gut symptoms while ingesting carbohydrate during exercise.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
OTHER
Masking
SINGLE
Enrollment
4
The carbohydrate beverage will supply approximately 100 grams of carbohydrate per day (in the form of glucose and fructose)
The placebo beverage will contain aspartame.
Human Performance Lab
Norfolk, Virginia, United States
Change in Gastrointestinal Symptom Ratings
Symptoms such as nausea, fullness, belching, reflux, abdominal cramps, flatulence, and urge to defecate will be recorded on a 0-10 scale (0 = no discomfort, 10 = unbearable discomfort).
Time frame: Symptoms will be collected during a 60 minute run on a treadmill at a baseline visit and at a second visit after ingesting the carbohydrate or placebo beverage for 5 days.
Change in Hydrogen Breath Production
Samples of expired air will be tested for hydrogen levels, a marker of carbohydrate malabsorption
Time frame: Samples will be collected before after a 60-minute run at a baseline visit and at a second visit after ingesting the carbohydrate or placebo beverage for 5 days.
Change in Carbohydrate Oxidation
Respiratory gases will be used to estimate carbohydrate oxidation rates.
Time frame: Respiratory gases will be collected during each 60-minute run at a baseline visit and at a second visit after ingesting the carbohydrate or placebo beverage for 5 days.
Change in Feeling Scale
A bipolar scale ranging from -5 (very bad) to +5 (very good)
Time frame: Ratings will be collected collected before and during each 60-minute run at a baseline visit and at a second visit after ingesting the carbohydrate or placebo beverage for 5 days.
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