title: Exercise training and dietary carbohydrate: effects on selected hormones and the thermic effect of feeding.
abstract: To determine relationships among dietary carbohydrate, aerobic exercise training, the thermic effect of food (TEF), and hormonal responses to feeding, 8 trained and 7 sedentary men consumed diets providing 15, 45, or 75% of energy as carbohydrate for 5 days. On Day 6, metabolic rate was measured before as well as 30, 60, 90, and 120 min after an 868-kcal liquid test breakfast. Blood was sampled hourly during Day 5 and during each metabolic rate measurement. The trained group had a larger TEF (40 +/- 2.4 vs. 31 +/- 3.0 kcal/2 hrs), greater insulin sensitivity, and greater plasma prolactin and cortisol levels. As carbohydrate in the treatment diet increased, carbohydrate utilization and thyroid stimulating hormone were higher and thyroxine was lower, but TEF was not significantly different. After the test meal, trained individuals had a higher TEF but the carbohydrate content of the treatment diet did not influence TEF.
authors.affiliation: Dept. of Natural Sciences, Messiah College, Grantham, PA 17027.
authors.forename: K A
authors.initials: KA
authors.lastname: Witt
authors.forename: J T
authors.initials: JT
authors.lastname: Snook
authors.forename: T M
authors.initials: TM
authors.lastname: O'Dorisio
authors.forename: D
authors.initials: D
authors.lastname: Zivony
authors.forename: W B
authors.initials: WB
authors.lastname: Malarkey
mesh_terms: D000293:Adolescent; D000328:Adult; D001831:Body Temperature / Q000502:physiology*; D002940:Circadian Rhythm; D004040:Dietary Carbohydrates / Q000494:pharmacology*; D004734:Energy Metabolism / Q000502:physiology; D015444:Exercise / Q000502:physiology*; D006728:Hormones / Q000378:metabolism*; D006801:Humans; D008297:Male
chemical_list: D004040:Dietary Carbohydrates; D006728:Hormones