title: Carbohydrate-protein drinks do not enhance recovery from exercise-induced muscle injury.
abstract: This study examined the effects of carbohydrate (CHO), carbohydrate-protein (CHO+PRO), or placebo (PLA) beverages on recovery from novel eccentric exercise. Female participants performed 30 min of downhill treadmill running (-12% grade, 8.0 mph), followed by consumption of a CHO, CHO+PRO, or PLA beverage immediately, 30, and 60 min after exercise. CHO and CHO+PRO groups (n=6 per group) consumed 1.2 g x kg body weight(-1) x hr(-1) CHO, with the CHO+PRO group consuming an additional 0.3 g x kg body weight(-1) x hr(-1) PRO. The PLA group (n=6) received an isovolumetric noncaloric beverage. Maximal isometric quadriceps strength (QUAD), lower extremity muscle soreness (SOR), and serum creatine kinase (CK) were assessed preinjury (PRE) and immediately and 1, 2, and 3 d postinjury to assess exercise-induced muscle injury and rate of recovery. There was no effect of treatment on recovery of QUAD (p= .21), SOR (p= .56), or CK (p= .59). In all groups, QUAD was reduced compared with PRE by 20.6%+/-1.5%, 17.2%+/-2.3%, and 11.3%+/-2.3% immediately, 1, and 2 d postinjury, respectively (p< .05). SOR peaked at 2 d postinjury (PRE vs. 2 d, 3.1+/-1.0 vs. 54.0+/-4.8 mm, p< .01), and serum CK peaked 1 d postinjury (PRE vs. 1 d, 138+/-47 vs. 757+/-144 U/L, p< .01). In conclusion, consuming a CHO+PRO or CHO beverage immediately after novel eccentric exercise failed to enhance recovery of exercise-induced muscle injury differently than what was observed with a PLA drink.
authors.affiliation: Kinesiology and Health Dept. Georgia State University, Atlanta, GA 30302-3975, USA.
authors.forename: Michael S
authors.initials: MS
authors.lastname: Green
authors.forename: Benjamin T
authors.initials: BT
authors.lastname: Corona
authors.forename: J Andrew
authors.initials: JA
authors.lastname: Doyle
authors.forename: Christopher P
authors.initials: CP
authors.lastname: Ingalls
mesh_terms: D000328:Adult; D001628:Beverages; D003402:Creatine Kinase / Q000097:blood; D018592:Cross-Over Studies; D004040:Dietary Carbohydrates / Q000008:administration & dosage*; D004044:Dietary Proteins / Q000008:administration & dosage*; D004311:Double-Blind Method; D015444:Exercise / Q000502:physiology*; D005260:Female; D006801:Humans; D053580:Muscle Strength; D018482:Muscle, Skeletal / Q000187:drug effects* / Q000293:injuries / Q000378:metabolism; D010919:Placebos; D012420:Running / Q000502:physiology
chemical_list: D004040:Dietary Carbohydrates; D004044:Dietary Proteins; D010919:Placebos; D003402:Creatine Kinase