title: Variable inflammation and intramuscular STAT3 phosphorylation and myeloperoxidase levels after downhill running.
abstract: Individual responses in creatine kinase (CK) release after eccentric exercise are divergent. This study aimed to identify whether this could be related to selected humoral or intramuscular inflammatory factors. Twenty-three subjects were divided into non-exercising (n = 5) and downhill run (DHR; n = 18) groups (12 × 5 min, 10% decline at 15 km/h). Blood samples were analyzed for white blood cell differential count, CK, myoglobin, tumor necrosis factor-α, granulocyte colony-stimulating factor, interleukin (IL)-1β, IL-6, and IL-10. Muscle biopsies were analyzed for signal transducer and activator of transcription-3 (STAT3), IκBα, and myeloperoxidase (MPO). DHR participants clustered as early (DHR1) recovery, biphasic response (DHR2), or classic delayed exaggerated CK response (DHR3), with a delayed CK peak (4784 ± 1496 U/L) on day 4. For DHR1 and DHR2, CK peaked on day 1 (DHR1: 1198 ± 837 U/L) or on day 1 and day 4 (DHR2: 1583 ± 448 U/L; 1878 ± 427 U/L), respectively. Immediately post-DHR, IL-6 increased in DHR2 and DHR3 whereas IL-10 increased in all DHR groups. STAT3 signaling increased for DHR1 and DHR2 at 4 h, but MPO at day 2 only in DHR2. Objective cluster analysis uncovered a group of subjects with a characteristic biphasic CK release after DHR. The second elevation was related to their early cytokine response. The results provide evidence that early responses following eccentric exercise are indicative of later variation.
authors.affiliation: Department of Physiological Sciences, Stellenbosch University, Stellenbosch, South Africa.
authors.forename: M
authors.initials: M
authors.lastname: van de Vyver
authors.forename: K H
authors.initials: KH
authors.lastname: Myburgh
mesh_terms: D003402:Creatine Kinase / Q000097:blood; D016179:Granulocyte Colony-Stimulating Factor / Q000097:blood; D006801:Humans; D007249:Inflammation / Q000097:blood / Q000378:metabolism*; D016753:Interleukin-10 / Q000097:blood; D053583:Interleukin-1beta / Q000097:blood; D015850:Interleukin-6 / Q000097:blood; D007958:Leukocyte Count; D008297:Male; D018763:Muscle Fatigue / Q000502:physiology; D018482:Muscle, Skeletal / Q000473:pathology; D063806:Myalgia / Q000503:physiopathology; D009211:Myoglobin / Q000097:blood; D009195:Peroxidase / Q000378:metabolism*; D010766:Phosphorylation; D012420:Running / Q000502:physiology*; D050796:STAT3 Transcription Factor / Q000378:metabolism*; D015398:Signal Transduction; D013997:Time Factors; D014409:Tumor Necrosis Factor-alpha / Q000097:blood; D055815:Young Adult
chemical_list: D053583:Interleukin-1beta; D015850:Interleukin-6; D009211:Myoglobin; D050796:STAT3 Transcription Factor; C494086:STAT3 protein, human; D014409:Tumor Necrosis Factor-alpha; D016753:Interleukin-10; D016179:Granulocyte Colony-Stimulating Factor; D009195:Peroxidase; D003402:Creatine Kinase
keywords: Creatine kinase; MPO; interleukin-6