title: Maximal voluntary contraction force, SR function and glycogen resynthesis during the first 72 h after a high-level competitive soccer game.
abstract: The aim of this study was to examine maximal voluntary knee-extensor contraction force (MVC force), sarcoplasmic reticulum (SR) function and muscle glycogen levels in the days after a high-level soccer game when players ingested an optimised diet. Seven high-level male soccer players had a vastus lateralis muscle biopsy and a blood sample collected in a control situation and at 0, 24, 48 and 72 h after a competitive soccer game. MVC force, SR function, muscle glycogen, muscle soreness and plasma myoglobin were measured. MVC force sustained over 1 s was 11 and 10% lower (P < 0.05) after 0 and 24 h, respectively, compared with control. The rate of SR Ca(2+) uptake at 800 nM [Ca(2+)](free) was lower (P < 0.05) after 0 h (2.5 μmol Ca(2+) g prot(-1) min(-1)) than for all other time points (24 h: 5.1 μmol Ca(2+) g prot(-1) min(-1)). However, SR Ca(2+) release rate was not affected. Plasma myoglobin was sixfold higher (P < 0.05) immediately after the game, but normalised 24 h after the game. Quadriceps muscle soreness (0-10 VAS-scale) was higher (P < 0.05) after 0 h (3.6), 24 h (1.8), 48 h (1.1) and 72 h (1.4) compared with control (0.1). Muscle glycogen was 57 and 27% lower (P < 0.001) 0 and 24 h after the game compared with control (193 and 328 vs. 449 mmol kg d w(-1)). In conclusion, maximal voluntary contraction force and SR Ca(2+) uptake were impaired and muscle soreness was elevated after a high-level soccer game, with faster recovery of SR function in comparison with MVC force, soreness and muscle glycogen.
authors: Department of Exercise and Sport Sciences, Section of Human Physiology, University of Copenhagen, Copenhagen, Denmark.
authors: Peter
authors: P
authors: Krustrup
authors: Niels
authors: N
authors: Ortenblad
authors: Joachim
authors: J
authors: Nielsen
authors: Lars
authors: L
authors: Nybo
authors: Thomas P
authors: TP
authors: Gunnarsson
authors: F Marcello
authors: FM
authors: Iaia
authors: Klavs
authors: K
authors: Madsen
authors: Francis
authors: F
authors: Stephens
authors: Paul
authors: P
authors: Greenhaff
authors: Jens
authors: J
authors: Bangsbo
mesh_terms: D000328:Adult; D054874:Athletic Performance / Q000502:physiology; D001706:Biopsy / Q000379:methods; D001826:Body Fluids / Q000502:physiology; D002118:Calcium / Q000378:metabolism; D006003:Glycogen / Q000096:biosynthesis / Q000378:metabolism*; D006339:Heart Rate / Q000502:physiology; D006801:Humans; D007719:Knee Joint / Q000378:metabolism / Q000502:physiology; D008297:Male; D009119:Muscle Contraction / Q000502:physiology*; D009211:Myoglobin / Q000097:blood; D010807:Physical Endurance / Q000502:physiology; D012519:Sarcoplasmic Reticulum / Q000378:metabolism / Q000502:physiology*; D012916:Soccer / Q000502:physiology*
chemical_list: D009211:Myoglobin; D006003:Glycogen; D002118:Calcium