The urinary excretion of collagen degradation products by quadriplegic patients and during weightlessness

Abstract
Urinary total hydroxyproline, peptide-bound hydroxyproline, hydroxylysine glycosides and Ca were measured in 3 healthy individuals subjected to weightlessness for 84 days and in 3 young quadriplegic patients. The former group had significant calciuria but no evidence of collagen degradation. The latter group had conspicuous calciuria and excreted large amounts of collagen breakdown products. This documented degradation of matrix may be related to the continuous calciuria, osteoporosis and cutaneous dystrophic changes occurring in quadriplegics.

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