title: The effect of food matrix on carbohydrate utilization during moderate exercise.
abstract: The effect of food matrix on carbohydrate utilization during moderate exercise. Med. Sci. Sports Exerc., Vol. 24, No. 3, pp. 320-326, 1992. To determine the effect of food type and form on the rate of assimilation and utilization of a meal given before exercise, five physically active adult males walked for 4 h on a 10% uphill graded treadmill at 40% VO2max. After a 12-h fast, and 30 min before exercise, subjects ingested 70 g of liquid glucose (G), a refined "hot cereal" (R), a refined "hot cereal" with water-soluble fiber (R/F), an oat bar (O), or placebo (P). Meals R/F, R, and O had significantly lower (P less than 0.05) peak plasma glucose responses than meal G (0.8, 0.9, 1.0, and 2.4 mmol.l-1, respectively). Meals R, O, and R/F had significantly lower (P less than 0.01) peak insulin responses than meal G (135, 150, 190, and 340 pmol.l-1, respectively). All meals except P contained an extrinsic tracer of 200 mg UL-13C-glucose. Mean (+/- SD) total recovery of the administered dose of 13C for all meals was 81 +/- 2%. Both O (34 +/- 4% dose.h-1) and R/F (30 +/- 3% dose.h-1) had significantly lower peak recoveries than did meal G (41 +/- 5% dose.h-1). Meal R/F had a significantly lower (P less than 0.05) rate of exogenous glucose oxidation than meal G during the first hour of exercise. These data suggest that meal R/F slows the rate of assimilation and utilization of exogenous glucose, but does not alter the cumulative 4-h utilization.
authors.affiliation: Department of Medicine, University of Chicago, IL 60637.
authors.forename: J K
authors.initials: JK
authors.lastname: Jarvis
authors.forename: D
authors.initials: D
authors.lastname: Pearsall
authors.forename: C M
authors.initials: CM
authors.lastname: Oliner
authors.forename: D A
authors.initials: DA
authors.lastname: Schoeller
mesh_terms: D000328:Adult; D001786:Blood Glucose / Q000378:metabolism*; D001944:Breath Tests; D002245:Carbon Dioxide / Q000032:analysis; D002247:Carbon Isotopes; D004040:Dietary Carbohydrates / Q000378:metabolism*; D015444:Exercise / Q000502:physiology*; D005080:Exercise Test; D005502:Food; D006801:Humans; D007328:Insulin / Q000097:blood; D008297:Male
chemical_list: D001786:Blood Glucose; D002247:Carbon Isotopes; D004040:Dietary Carbohydrates; D007328:Insulin; D002245:Carbon Dioxide