Article

Healthy elderly French women living at home have secondary hyperparathyroidism and high bone turnover in winter. EPIDOS Study Group

INSERM U-403, Edouard Herriot Hospital, Lyon, France.
Journal of Clinical Endocrinology & Metabolism (Impact Factor: 6.21). 04/1996; 81(3):1129-33.
Source: PubMed

ABSTRACT

It was recently demonstrated that calcium and vitamin D supplements were capable of decreasing the incidence of hip fractures in institutionalized elderly subjects through a reduction of senile secondary hyperparathyroidism. As there are no appropriate data to recommend such a supplement to the elderly living at home, the aim of this study was to determine the incidence of senile secondary hyperparathyroidism in old French women from the general community, its relation to vitamin D status, and its contribution to bone turnover. Four hundred and forty women, aged 75-90 yr, were randomly selected from the general community by mailing from electoral listing in 5 French cities whose latitude varies from 49 degrees 9N to 43 degrees 6N. At the end of the winter, with previous hip fractures or those who were institutionalized were excluded. The results obtained in these women were compared to those obtained in 59 institutionalized old women and 54 younger healthy women. In the five cities for the women living at home, we found a mean PTH value greater than that obtained in young women (63 +/- 28 vs. 43 +/- 15 pg/ml; P = 0.001), but lower that that found in institutionalized women (76 +/- 49 pg/mL; P = 0.05). The mean 25-hydroxyvitamin D (25OHD) level was not different in subjects from the 5 cities, but in all of them it was significantly greater than that found in 59 institutionalized women (42.5 +/- 25.0 vs. 15.5 +/- 6.5 nmol/L; P = 0.0001) but lower than that in young adults (P < 0.001). The main determinants of PTH were in equal ratio, i.e. age (r = 0.19; P < 0.001), 25OHD, and, to a lesser degree, creatinine clearance (r = 0.10; P = 0.03). For 25OHD, the main determinant was the personal outdoor score and, to a lesser extent, the amount of daily sunlight in the city. The mean values of biochemical markers of bone turnover, bone alkaline phosphatase, osteocalcin, and Crosslaps, were significantly increased compared with the results obtained in young women, and significant negative correlations were found between these markers and hip bone mineral density. These results show that vitamin D status of a French aged population in good health and living at home depends mainly on lifestyle. Like institutionalized women, old women living at home exhibit clear evidence of senile hyperparathyroidism in the winter, secondary in part to a reduced 25OHD level and associated with biological signs of increased bone turnover. The maintenance of PTH within the normal range for healthy adults by vitamin D and calcium treatment might constitute an approach for the prevention of bone loss in the entire aged population.

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    • "UI/die) di colecalciferolo per trattare il deficit e per mantenere livelli di 25-OH-vitamina D > 30 ng/ml, con terapia poi di mantenimento di 3.000–6.000 IU/die [15] [15]. È stato osservato che è più importante l'apporto di colecalciferolo rispetto a quello di calcio e che la somministrazione di quest'ultimo è in grado di ridurre in maniera efficace il rischio di frattura soltanto se viene garantito un adeguato livello plasmatico di vitamina D [16] [16]. "
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    ABSTRACT: Vitamin D is an essential micronutrient for humans. Vitamin D functions are not limited to the regulation of bone; it plays many pleiotropic effects due to ubiquitous distribution of VDR (Vitamin D Receptor). The vitamin D deficiency (defined as plasma levels of 25 - OH - vitamin D < 30 ng / ml) is now a public health problem worldwide. It is therefore essential to define protocols for supplementation of vitamin D in the general population and in patients with Chronic Kidney Disease and indications on the use of different Vitamins D available.
    Full-text · Article · Jul 2015
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    • "Vitamin D deficiency, a pandemic health problem, is a major cause of rickets in infants and toddlers and of osteopenia in adolescents [1] [2] [3] [4] [5] [6]. The production of vitamin D in the skin depends on sunshine exposure, latitude, skincovering clothes, the use of sun block, and skin pigmentation. "
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    ABSTRACT: Objectives. We aimed to determine the relationship between insulin resistance and serum 25-hydroxyvitamin D (25-OHD) levels in obese children and their nonobese peers. Materials and Methods. Included in the study group were 188 obese children (aged 9–15 years), and 68 age- and gender-matched healthy children of normal weight as control group. Anthropomorphic data were collected on patients and fasting serum glucose, insulin, serum lipids, alanine aminotransaminase (ALT) and 25-OHD were measured. The homeostatic model assessment of insulin resistance (HOMA-IR) was calculated in both groups. Results. The levels of 25-OHD in the obese group were significantly lower than those of the nonobese (P = 0.002). HOMA-IR, triglycerides, low-density lipoprotein, and ALT levels in the obese group were significantly higher than values of control group (P < 0.001 and P = 0.002, resp.). In the obese group, vitamin D deficiency, insufficiency, and sufficiency (25-OHD < 10 ng/dl, < 20, >10 ng/dl; > 20 ng/dl, resp.) were not correlated with HOMA-IR (r : −0.008, P = 0.935). HOMA-IR was negatively correlated with BMI, BMI SDS, and BMI%, and triglycerides, low-density lipoprotein, and ALT levels (P < 0.001). Conclusion. The insulin resistance of the obese subjects who were vitamin D deficient and insufficient did not statistically differ from those with vitamin D sufficiency. Low 25-hydroxyvitamin D levels were not related with higher insulin resistance in obese children and adolescents. In obese subjects, insulin resistance was affected more from BMI, BMI SDS, and BMI% than from 25-hydroxyvitamin D levels.
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    • "noted that the relationships between vitamin D and non-skeletal outcomes warrant further research, but the existing data for such outcomes are too few to base recommendations upon (Holick and others 2011, Ross and others 2011). Vitamin D deficiency and insufficiency are widespread in the United States and Canada, with estimates ranging from 20% to 100% of the population as vitamin D deficient (Chapuy and others 1996, Holick 2006, Holick 2007, Lips and others 2006, Greene- Finestone and others 2011, Holick and others 2011, 2005, Looker and others 2011, Whiting and others 2011). However, the definition of vitamin D inadequacy based on serum 25(OH)D concentration is a topic of debate, but is most commonly defined as either 20 ng/mL as by the Inst. of Medicine (Ross and others 2011) or 30 ng/mL as by the Endocrine Society (Holick and others 2011). "
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