Interrelation between Plasma Concentrations of Vitamins C and E along the Trajectory of Ageing in Consideration of Lifestyle and Body Composition: A Longitudinal Study over Two Decades
2020
Alexandra Jungert | Monika Neuhäuser-Berthold
Although the interrelation between vitamins C and E has been demonstrated on an experimental level, its impact on biomarkers in community-dwelling subjects along the trajectory of ageing has not yet been shown. The present longitudinal study investigates the determinants and interrelation of vitamins C and E plasma concentrations in 399 subjects aged &ge:60 years with a median follow-up time of 12 years. Linear mixed-effects models were used to analyze the influence of age, sex, body composition, dietary intake, physical activity, smoking and supplement/drug use on plasma vitamin C, plasma &alpha:-tocopherol and &alpha:-tocopherol/total cholesterol ratio. At baseline, median plasma concentrations of vitamin C and &alpha:-tocopherol were 74 and 35 µ:mol/L. Absolute fat-free mass, physical activity, use of supplements, and plasma &alpha:-tocopherol were main determinants of plasma vitamin C in the course of ageing. For the &alpha:-tocopherol/total cholesterol ratio, age, use of supplements, use of lipid-modifying drugs, and plasma vitamin C were main determinants. The results reveal a stable positive interrelation between plasma concentrations of vitamins C and E along the trajectory of ageing independent of the other identified determinants. The possible regulatory mechanisms that could explain this robust positive interrelation remain to be elucidated.
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