The objectives are to test the acute effects of different cereals containing pulse ingredients on: 1) aerobic endurance and substrate oxidation during exercise 2) response of blood glucose, insulin and appetite to an aerobic exercise session, and 3) food intake two hours following the exercise session. The investigators hypothesize that consumption of cereals containing pulse ingredients 60 minutes before exercise will increase aerobic endurance (lower oxygen consumption), decrease carbohydrate oxidation (greater respiratory quotient), and a reduction in lactate production during compared to the same exercise session following the ingestion of a non-pulse food. The investigators also hypothesize that consumption of cereals containing pulse ingredients will lead to lower blood glucose, insulin, appetite and food intake, suggesting lower calorie compensation, following a 60-minute aerobic exercise session compared to the same exercise session following the ingestion of a non-pulse food.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
PREVENTION
Masking
TRIPLE
Enrollment
30
Non pulse extruded cereal
Pulse extruded cereal
Pulse extruded cereal
Pulse extruded cereal
Pulse extruded cereal
Pulse extruded cereal
Richardson Centre for Functional Foods and Nutraceuticals
Winnipeg, Manitoba, Canada
Plasma Glucose Concentrations
Measured in blood using intravenous catheter. Glucose will be determined by automated methods using Abbot Spectrum Clinical Chemistry-X Analyzer,
Time frame: 0-240 minutes
Food Intake
Ad-libitum meal
Time frame: at 240 minutes
Subjective Appetite
Motivation-to-eat Visual Analog Scale questionnaire
Time frame: 0-240 minutes
Exercise intensity
Oxygen consumption measured during exercise at 3 time points
Time frame: 60-120 minutes
Insulin concentrations
Measured in blood using intravenous catheter. and Insulin will be measured by commercially available radioimmunoassay (RIA) kits
Time frame: 0-240 minutes
Palatability measured by Visual Analog Scale questionnaire
Food tasting
Time frame: 5 and 260 minutes
Physical comfort measured by Visual Analog Scale questionnaire
Contributions from energy intake
Time frame: 0-240 minutes
Energy/fatigue measured by Visual Analog Scale questionnaire
Estimate of energy expenditure
Time frame: 0 - 240 minutes
Heart rate
To monitor exercise intensity and give a measure of fatigue (cardiovascular drift)
Time frame: 60-120 minutes
Substrate Oxidation
Respiratory quotient measured during exercise at 3 time points
Time frame: 60-120 minutes
Lactate concentration
Measured before, during, and after exercise exercise at 3 time points
Time frame: 60-120 minutes
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