title: Effects of an amino acid carbohydrate drink on exercise performance after consecutive-day exercise bouts.
abstract: This study examined the effect of amino acids in a carbohydrate beverage on cycling performance. Twelve male athletes (28.5 +/- 2.1 yr) cycled at 75% VO2peak for 90 min followed by a ride to exhaustion at 85% VO2peak, before (T1) and on 2 consecutive days (T2 and T3) after 2 weeks of supplementation with 3.6% carbohydrate plus 1% amino acids (AA) or 4.6% carbohydrate-only (CHO) isocaloric beverages. Muscle damage was assessed by plasma creatine kinase (CK), and muscle fatigue by changes in vertical jump pre- to postexercise. Muscle soreness, overall fatigue, and changes in mood state were assessed using questionnaires. Plasma CK was lower for AA in T3 (214.0 +/- 13.5 vs. 485.9 +/- 191.4 U/L immediately post, 213.9 +/- 13.1 vs. 492.0 +/- 199.4 U/L 5 hr post, and 194.9 +/- 17.9 vs. 405.9 +/- 166.6 U/L 24 hr postexercise in AA and CHO, respectively). Time to exhaustion decreased from T2 to T3 only in CHO (10.9 +/- 2.5 to 12.6 +/- 3.2 vs. 13.8 +/- 2.8 to 7.8 +/- 1.5 min in AA and CHO, respectively). Vertical-jump change from pre- to postexercise was greater in T3 for the CHO treatment. Total fatigue score and mood disturbance decreased significantly only with AA in T3. The addition of AA to a carbohydrate beverage after consecutive-day exercise bouts reduced muscle damage as indicated by CK levels, decreased fatigue, and maintained exercise performance compared with consuming carbohydrate alone.
authors.affiliation: Sports Performance Laboratory, University of California-Davis, Sacramento, CA, USA.
authors.forename: Rebecca A
authors.initials: RA
authors.lastname: Skillen
authors.forename: Massimo
authors.initials: M
authors.lastname: Testa
authors.forename: Elizabeth A
authors.initials: EA
authors.lastname: Applegate
authors.forename: Eric A
authors.initials: EA
authors.lastname: Heiden
authors.forename: Andrea J
authors.initials: AJ
authors.lastname: Fascetti
authors.forename: Gretchen A
authors.initials: GA
authors.lastname: Casazza
mesh_terms: D000328:Adult; D000339:Affect; D001628:Beverages; D001642:Bicycling / Q000502:physiology; D003402:Creatine Kinase / Q000097:blood; D018592:Cross-Over Studies; D004040:Dietary Carbohydrates / Q000008:administration & dosage*; D004044:Dietary Proteins / Q000008:administration & dosage*; D015444:Exercise / Q000502:physiology*; D005221:Fatigue / Q000453:epidemiology; D006801:Humans; D008297:Male; D009751:Nutritional Requirements; D010101:Oxygen Consumption; D005082:Physical Exertion / Q000187:drug effects* / Q000502:physiology; D011795:Surveys and Questionnaires; D013997:Time Factors
chemical_list: D004040:Dietary Carbohydrates; D004044:Dietary Proteins; D003402:Creatine Kinase