The objectives are to test the acute effects of different extruded pulse snacks on: 1) aerobic endurance and substrate oxidation during exercise 2) response of blood glucose, insulin and appetite on an aerobic exercise session, and 3) food intake two hours following the exercise session. The investigators hypothesize that consumption of food products 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 extruded pulse snacks 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 snack
Pulse extruded snack
Pulse extruded snack
Pulse extruded snack
Pulse extruded snack
Pulse extruded snack
Richardson Centre for Functional Foods and Nutraceuticals
Winnipeg, Manitoba, Canada
Plasma Glucose and Insulin Concentrations
Measured in blood using intravenous catheter at 14 time points, used to calculate area under curve (AUC). Glucose will be determined by automated methods using Abbot Spectrum CCX Analyzer, and Insulin will be measured by commercially available RIA kits. (Composite measure)
Time frame: 0 - 240 min
Food Intake
Ad-libitum meal. Food consumed measured by weight.
Time frame: at 120 min
Subjective Appetite
Measured by VAS questionnaire at 14 time points, used to calculate area under curve (AUC).( Composite measure)
Time frame: 0-240 min
Exercise intensity
Sixty minute exercise protocol at minutes 60 to 120. Oxygen consumption measured during exercise at 3 time points.
Time frame: 60 minutes
Lactate concentration
60 minute exercise protocol at minutes 60 to 120. Measured before, during, and exercise exercise at 3 time points
Time frame: 60 minutes
Palatability of treatments
Measured by VAS questionnaire
Time frame: at 5 minutes
Palatability of meal
Measured by VAS questionnaire
Time frame: at 260 minutes
Physical comfort
Measured by VAS questionnaire at 13 time points, used to calculate area under curve (AUC) (Composite measure)
Time frame: 0-240 min
Energy/fatigue
Measured by VAS questionnaire at 13 time points, used to calculate area under curve (AUC) (Composite measure)
Time frame: 0-240 min
Heart rate
Heart rate monitored over a 60 minute exercise protocol. To monitor exercise intensity and give a measure of fatigue (cardiovascular drift)
Time frame: 60-120 min
Substrate Oxidation
Measured during 60 minute exercise protocol at minutes 60-120. Respiratory quotient measured during exercise at 3 time points.
Time frame: 60 minutes
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