Recovery of endurance running capacity: effect of carbohydrate-protein mixtures.
Including protein in a carbohydrate solution may accelerate both the rate of glycogen storage and the restoration of exercise capacity following prolonged activity. Two studies were undertaken with nine active men in study A and seven in study B. All participants performed 2 trials, each involving a 90 min run at 70% VO2max followed by a 4 h recovery. During recovery, either a 9.3% carbohydrate solution (CHO) or the same solution plus 1.5% protein (CHO-PRO) was ingested every 30 min in volumes providing either 1.2 g CHO x kg(-1) x h(-1) (study A) or 0.8 g CHO x kg(-1) x h(-1) (study B). Exercise capacity was then assessed by run time to exhaustion at 85% VO2max. Ingestion of CHO-PRO elicited greater insulinemic responses than CHO (P< or = 0.05) but with no differences in run times to exhaustion. Within the context of this experimental design, CHO and CHO-PRO restored running capacity with equal effect.
Betts
James A
JA
School of Sport and Exercise Sciences, Loughborough University, UK.
Stevenson
Emma
E
Williams
Clyde
C
Sheppard
Catrin
C
Grey
Edwin
E
Griffin
Joe
J
D000328:Adult; D019540:Area Under Curve; D001628:Beverages; D018592:Cross-Over Studies; D004040:Dietary Carbohydrates / Q000008:administration & dosage*; D004044:Dietary Proteins / Q000008:administration & dosage*; D004305:Dose-Response Relationship, Drug; D004311:Double-Blind Method; D006003:Glycogen / Q000378:metabolism; D006801:Humans; D007328:Insulin / Q000097:blood* / Q000378:metabolism; D008297:Male; D010101:Oxygen Consumption / Q000187:drug effects / Q000502:physiology; D010807:Physical Endurance / Q000187:drug effects* / Q000502:physiology; D012420:Running / Q000502:physiology*; D013997:Time Factors
D004040:Dietary Carbohydrates; D004044:Dietary Proteins; D007328:Insulin; D006003:Glycogen