Age Dependency of Infradian Rhythms in Enzymuria of Female Volunteers

Abstract

Summary:The enzyme excretion of dipeptidylpeptidase IV (EC 3.4.14.5), γ-glutamyltransferase (EC 2.3.2.2), and alanine aminopeptidase (EC 3.4.11) was pursued in three different age groups of female volunteers over a period of 70 days. The first group (1-3 years: n = 6) consisted of girls living in a children's home, the second (26-50 years, n = 7) of medical staff and the third (65-87 years, n = 7) of the inhabitants of an old-age home. Subsequent to basic statistics the excretion patterns were analyzed by spectral analysis with the maximum entropy method.The mean values of all enzymes displayed a distinct age-dependency. The highest levels of enzyme excretion were found in the early childhood. In all groups infradian changes of enzyme excretion were detected. In excretion of γ-glutamyltransferase, longer periods between 12 and 24 days predominated during the early childhood, whereas in the middle, and in particular in the higher age, shorter dominant periods occurred more frequently. The excretion of alanine aminopeptidase displayed a similar tendency. Circaseptan periods (7 ± 1 days) were rarely observed among the dominant periods of the maximum entropy method spectra. A correlation analysis of the individual excretion patterns revealed that the excretion of all three brush-border enzymes is most tightly correlated in the early childhood (coefficients of correlation up to 0.9). In contrast, the correlation between enzyme and creatinine excretion was low in all age groups.

Physiological Rhythms and Biological Variation of Biomolecules: The Road to Personalized Laboratory Medicine

“…Moreover, infradian variations have been observed in various measurands including TSH and thyroid hormones [ 85 , 112 ], sperm physiology [ 113 ], urinary excretion of growth hormone [ 114 ], enzymes [ 115 , 116 ], etc.…”