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Biomarkers
Year: 2010  |  Volume: 15  |  Issue: 1  |  Page No.: 80 - 85

Circadian pattern and the effect of standardized physical exercise on procollagen IIA N-peptide (PIIANP) in rheumatoid arthritis at different stages and in healthy individuals

A. F. Christensen, T. Lottenburger, H. M. Lindegaard, K. Junker, K. Horslev-Petersen and P. Junker    

Abstract: Background: Variant collagen IIA is re-expressed in diseased cartilage. Low procollagen IIA N-peptide (PIIANP) levels in serum have recently been reported in rheumatoid arthritis (RA). We investigated circadian rhythmicity and effect of physical activity on PIIANP in early and longstanding RA and in healthy subjects. Methods: Patients with early and longstanding RA and controls were included. Fasting and serial blood samples were collected during 24h. PIIANP response to physical activity was studied before and serially after standardized exercise. Results and conclusion: In RA at different stages and healthy individuals, PIIANP exhibited no circadian rhythmicity, and PIIANP in serum was not influenced by physical activity.

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