Whey protein isolate attenuates strength decline after eccentrically-induced muscle damage in healthy individuals
Open Access
- 5 January 2010
- journal article
- Published by Taylor & Francis Ltd in Journal of the International Society of Sports Nutrition
- Vol. 7 (1), 30
- https://doi.org/10.1186/1550-2783-7-30
Abstract
We examined the effects of short-term consumption of whey protein isolate on muscle proteins and force recovery after eccentrically-induced muscle damage in healthy individuals. Seventeen untrained male participants (23 ± 5 yr, 180 ± 6 cm, 80 ± 11 kg) were randomly separated into two supplement groups: i) whey protein isolate (WPH; n = 9); or ii) carbohydrate (CHO; n = 8). Participants consumed 1.5 g/kg.bw/day supplement (~30 g consumed immediately, and then once with breakfast, lunch, in the afternoon and after the evening meal) for a period of 14 days following a unilateral eccentric contraction-based resistance exercise session, consisting of 4 sets of 10 repetitions at 120% of maximum voluntary contraction on the leg press, leg extension and leg flexion exercise machine. Plasma creatine kinase and lactate dehydrogenase (LDH) levels were assessed as blood markers of muscle damage. Muscle strength was examined by voluntary isokinetic knee extension using a Cybex dynamometer. Data were analyzed using repeated measures ANOVA with an alpha of 0.05. Isometric knee extension strength was significantly higher following WPH supplementation 3 (P < 0.05) and 7 (P < 0.01) days into recovery from exercise-induced muscle damage compared to CHO supplementation. In addition, strong tendencies for higher isokinetic forces (extension and flexion) were observed during the recovery period following WPH supplementation, with knee extension strength being significantly greater (P < 0.05) after 7 days recovery. Plasma LDH levels tended to be lower (P = 0.06) in the WPH supplemented group during recovery. The major finding of this investigation was that whey protein isolate supplementation attenuated the impairment in isometric and isokinetic muscle forces during recovery from exercise-induced muscle injury.Keywords
This publication has 42 references indexed in Scilit:
- Comparison of Different Sources and Degrees of Hydrolysis of Dietary Protein: Effect on Plasma Amino Acids, Dipeptides, and Insulin Responses in Human SubjectsJournal of Agricultural and Food Chemistry, 2010
- Creatine supplementation enhances muscle force recovery after eccentrically-induced muscle damage in healthy individualsJournal of the International Society of Sports Nutrition, 2009
- Protein for adaptations to exercise trainingEuropean Journal of Sport Science, 2008
- Effect of carbohydrate-protein supplement timing on acute exercise-induced muscle damageJournal of the International Society of Sports Nutrition, 2008
- No effect of menstrual cycle on myofibrillar and connective tissue protein synthesis in contracting skeletal muscleAmerican Journal of Physiology-Endocrinology and Metabolism, 2006
- Branched-chain amino acids increase p70S6k phosphorylation in human skeletal muscle after resistance exerciseAmerican Journal of Physiology-Endocrinology and Metabolism, 2004
- Protein and amino acids for athletesJournal of Sports Sciences, 2004
- PROTEIN AND AMINO ACID METABOLISM DURING AND AFTER EXERCISE AND THE EFFECTS OF NUTRITIONAnnual Review of Nutrition, 2000
- Response of males and females to high-force eccentric exerciseJournal of Sports Sciences, 2000
- Recommended method for the determination of creatine kinase in blood modified by the inclusion of EDTA: The Committee on Enzymes of The Scandinavian Society for Clinical Chemistry and Clinical Physiology (SCE)Scandinavian Journal of Clinical and Laboratory Investigation, 1979