JARVIS, J. K., D. PEARSALL, C. M. OLINER, and D. A. SCHOELLER. 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% &OV0312;O2max. 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< 0.05) peak plasma glucose responses than meal G (0.8, 0.9, 1.0, and 2.4 mmol ·1-1, respectively). Meals R, O, and R/F had significantly lower (P< 0.01) peak insulin responses than meal G (135, 150, 190, and 340 pmol ·1-1, respectively). All meals except P contained an extrinsic tracer of 200 mg UL-13C-glucose. Mean (±SD) total recovery of the administered dose of13C 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< 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.