title: The efficacy of protein supplementation during recovery from muscle-damaging concurrent exercise.
abstract: This study investigated the effect of protein supplementation on recovery following muscle-damaging exercise, which was induced with a concurrent exercise design. Twenty-four well-trained male cyclists were randomised to 3 independent groups receiving 20 g protein hydrolysate, iso-caloric carbohydrate, or low-calorific placebo supplementation, per serve. Supplement serves were provided twice daily, from the onset of the muscle-damaging exercise, for a total of 4 days and in addition to a controlled diet (6 g·kg-1·day-1carbohydrate, 1.2 g·kg-1·day-1protein, remainder from fat). Following the concurrent exercise session at time-point 0 h, comprising a simulated high-intensity road cycling trial and 100 drop-jumps, recovery of outcome measures was assessed at 24, 48, and 72 h. The concurrent exercise protocol was deemed to have caused exercise-induced muscle damage (EIMD), owing to time effects (p < 0.001), confirming decrements in maximal voluntary contraction (peaking at 15% ± 10%) and countermovement jump performance (peaking at 8% ± 7%), along with increased muscle soreness, creatine kinase, and C-reactive protein concentrations. No group or interaction effects (p > 0.05) were observed for any of the outcome measures. The present results indicate that protein supplementation does not attenuate any of the indirect indices of EIMD imposed by concurrent exercise, when employing great rigour around the provision of a quality habitual diet and the provision of appropriate supplemental controls.
authors.affiliation: a GlaxoSmithKline Human Performance Laboratory, Brentford TW8 9DA, UK.|b Department of Sport, Exercise and Rehabilitation, Northumbria University, Newcastle upon Tyne NE1 8ST, UK.
authors.forename: Lee
authors.initials: L
authors.lastname: Eddens
authors.affiliation: a GlaxoSmithKline Human Performance Laboratory, Brentford TW8 9DA, UK.|b Department of Sport, Exercise and Rehabilitation, Northumbria University, Newcastle upon Tyne NE1 8ST, UK.
authors.forename: Sarah
authors.initials: S
authors.lastname: Browne
authors.affiliation: c Institute of Cellular Medicine, Faculty of Medical Sciences, Newcastle University, Newcastle upon Tyne NE2 4HH, UK.
authors.forename: Emma J
authors.initials: EJ
authors.lastname: Stevenson
authors.affiliation: a GlaxoSmithKline Human Performance Laboratory, Brentford TW8 9DA, UK.
authors.forename: Brad
authors.initials: B
authors.lastname: Sanderson
authors.affiliation: a GlaxoSmithKline Human Performance Laboratory, Brentford TW8 9DA, UK.
authors.forename: Ken
authors.initials: K
authors.lastname: van Someren
authors.affiliation: b Department of Sport, Exercise and Rehabilitation, Northumbria University, Newcastle upon Tyne NE1 8ST, UK.|d Water Research Group, North West University, Potchefstroom 2520, South Africa.
authors.forename: Glyn
authors.initials: G
authors.lastname: Howatson
mesh_terms: D000328:Adult; D001642:Bicycling; D015992:Body Mass Index; D002097:C-Reactive Protein / Q000378:metabolism; D003402:Creatine Kinase / Q000097:blood; D004032:Diet; D004044:Dietary Proteins / Q000008:administration & dosage*; D019587:Dietary Supplements; D004311:Double-Blind Method; D015444:Exercise; D006801:Humans; D008297:Male; D018482:Muscle, Skeletal / Q000187:drug effects / Q000502:physiology*; D063806:Myalgia / Q000188:drug therapy; D010101:Oxygen Consumption; D055815:Young Adult
chemical_list: D004044:Dietary Proteins; D002097:C-Reactive Protein; D003402:Creatine Kinase
keywords: EIMD; concurrent training; douleur musculaire; entraînement concurrent; exercise recovery; muscle soreness; protein supplementation; récupération à l’effort; supplémentation protéique