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Effect of whey protein or carbohydrate supplementation on markers of muscle damage, muscular dysfunction and leg soreness
Author(s) -
Witard Oliver Charles,
Jackman Sarah R,
Jeukendrup Asker E,
Tipton Kevin D
Publication year - 2008
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fasebj.22.1_supplement.1175.6
Subject(s) - creatine kinase , placebo , muscle damage , myoglobin , isometric exercise , medicine , delayed onset muscle soreness , whey protein , eccentric , physical therapy , endocrinology , chemistry , biochemistry , pathology , physics , quantum mechanics , alternative medicine
This study aimed to determine the impact of whey protein (WP) or carbohydrate (CHO) supplementation on recovery from exercise‐induced muscle damage. In a parallel, placebo‐controlled, single‐blind experimental trial, untrained males were randomly assigned to a WP (n=12), CHO (n=12) or placebo (n=12) supplementary group. Muscle damage was elicited by implementing an eccentric unilateral leg extensor protocol (15×10 repetitions at 170% peak isokinetic torque) using an isokinetic dynamometer. Diet was strictly controlled throughout the trial. Measures of muscle function, muscle damage, leg soreness and inflammation were taken pre‐ and post‐ (1, 8, 24, 48 and 72h) exercise. Maximal isometric strength (MIS) decreased by ~32% at 48h post‐ (662.3±32.2N) compared to pre‐exercise (451.2±38.9N) (P<0.01). Ratings of leg soreness peaked 24h following exercise. No effect of supplement was observed on post‐exercise plasma creatine kinase (CK) or myoglobin responses, MIS, visual analogue scale ratings or leg volume (P>0.05). Measures of muscle function and CK showed no correlation (r=−0.211) (P=0.402). These data suggest the chosen experimental model successfully increased muscular dysfunction, leg soreness and putative markers of muscle damage. However, supplementation with 40g/d WP or CHO failed to ameliorate these symptoms of muscle damage under conditions of dietary control. Protarmor 907 LSI whey protein was supplied by Armor Proteines, Saint‐Brice‐en‐Cogles‐FRANCE