title: Preexercise feeding in untrained adolescent boys does not affect responses to endurance exercise or performance.
abstract: The effects of preexercise feeding on responses to endurance exercise and performance were investigated. Untrained adolescent boys (N = 13, age 14.9 +/- 0.5 years) completed three endurance test sessions separated by a minimum of 72 hr. Each session consisted of 75 min of cycling at 60% of VO2 max followed by a high-intensity performance test. Dietary conditions were a candy bar (C1: 280 kcal, 36 g CHO), fat-free fig bars (C2: 200 kcal, 44 g CHO), and a nonnutritive sweetened drink (C3: placebo), ingested 10 min prior to exercise. Respiratory gases, heart rate, blood glucose, and lactate concentrations were measured throughout the test. ANOVA results revealed significant time effects for all variables; however, no differences were seen among the conditions. Performance times, 311.9 +/- 38.5 s in C1, 316.2 +/- 37.3 s in C2, and 328.1 +/- 46.4 s in C3, were not significantly different among conditions. Thus, preexercise feeding did not affect responses to endurance exercise or performance in adolescent boys.
authors.affiliation: Department of Exercise Science, University of Massachusetts, Amherst 01003, USA.
authors.forename: D L
authors.initials: DL
authors.lastname: Hendelman
authors.forename: K
authors.initials: K
authors.lastname: Ornstein
authors.forename: E P
authors.initials: EP
authors.lastname: Debold
authors.forename: S L
authors.initials: SL
authors.lastname: Volpe
authors.forename: P S
authors.initials: PS
authors.lastname: Freedson
mesh_terms: D000293:Adolescent; D001786:Blood Glucose / Q000378:metabolism; D004032:Diet; D004435:Eating / Q000502:physiology*; D015444:Exercise / Q000502:physiology; D006339:Heart Rate; D006801:Humans; D007773:Lactates / Q000097:blood; D008297:Male; D010101:Oxygen Consumption; D010807:Physical Endurance / Q000502:physiology*
chemical_list: D001786:Blood Glucose; D007773:Lactates