title: Effects of isocaloric carbohydrate vs. carbohydrate-protein supplements on cycling time to exhaustion.
abstract: The purpose of this study was to investigate the effects of isocaloric carbohydrate (CHO) and carbohydrate-protein (CHO-Pro) supplements on time to exhaustion. Eleven moderately aerobically fit adults (V[Combining Dot Above]O2max= 48.3 ± 6.5 ml·kg·min) performed a maximal cycle ergometer test for the determination of V[Combining Dot Above]O2max. At least 72 hours later, the participants performed a time-to-exhaustion test at a power output equivalent to the power output when subjects were at 75% of their V[Combining Dot Above]O2max. Either the CHO or the CHO-Pro supplement was administered at 0, 30, 60, 90, and 120 minutes after this test. After 3 hours of recovery and supplement ingestion, a second time-to-exhaustion test was performed. This testing protocol was repeated for the third visit, but the supplement not given during the second visit was administered. The results indicated that there was no significant difference in time to exhaustion after isocaloric CHO (pretest 22.4 ± 2.84 minutes, posttest 25.4 ± 4.45 minutes) and CHO-Pro (pretest 22.3 ± 3.46 minutes, posttest 24.0 ± 5.08 minutes) supplementation. Carbohydrate and CHO-Pro ingestion after exercise appear to have similar effects on short-term recovery.
authors.affiliation: Exercise Physiology Laboratory, Department of Kinesiology, California State University, Fullerton, California, USA.
authors.forename: Kristy L
authors.initials: KL
authors.lastname: Richardson
authors.forename: Jared W
authors.initials: JW
authors.lastname: Coburn
authors.forename: William C
authors.initials: WC
authors.lastname: Beam
authors.forename: Lee E
authors.initials: LE
authors.lastname: Brown
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D004040:Dietary Carbohydrates / Q000494:pharmacology*; D004044:Dietary Proteins / Q000494:pharmacology*; D019587:Dietary Supplements; D005080:Exercise Test; D005260:Female; D006801:Humans; D008297:Male; D010807:Physical Endurance / Q000187:drug effects*; D055815:Young Adult
chemical_list: D004040:Dietary Carbohydrates; D004044:Dietary Proteins