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Osteoporosis Research Center, Endocrinology and Metabolism Clinical Sciences Institute, Tehran University of Medical Sciences, Tehran, Iran
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Kiel Institute for the World Economy, Kiel, Germany
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Department of Epidemiology and Biostatistics, School of Public Health, Tehran University of Medical Science, Tehran, Iran
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leads to a significant loss of healthy life years mostly due to disability in elderly people ( 7 ). Epidemiology and burden of osteoporosis are among the main foci of highly cited papers in the field of osteoporosis ( 8 ). The rate of fractures and the
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University for Health Sciences, Medical Informatics and Technology (UMIT TIROL), Tirol, Austria
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Institute for Medical Biometry, Informatics and Epidemiology (IMBIE), Faculty of Medicine, University of Bonn, Bonn, Germany
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Department of Neurology, Faculty of Medicine, University of Bonn, Bonn, Germany
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Objective
Maintaining muscle function throughout life is critical for healthy ageing. Although in vitro studies consistently indicate beneficial effects of 25-hydroxyvitamin D (25-OHD) on muscle function, findings from population-based studies remain inconclusive. We therefore aimed to examine the association between 25-OHD concentration and handgrip strength across a wide age range and assess potential modifying effects of age, sex and season.
Methods
We analysed cross-sectional baseline data of 2576 eligible participants out of the first 3000 participants (recruited from March 2016 to March 2019) of the Rhineland Study, a community-based cohort study in Bonn, Germany. Multivariate linear regression models were used to assess the relation between 25-OHD levels and grip strength while adjusting for age, sex, education, smoking, season, body mass index, physical activity levels, osteoporosis and vitamin D supplementation.
Results
Compared to participants with deficient 25-OHD levels (<30 nmol/L), grip strength was higher in those with inadequate (30 to <50 nmol/L) and adequate (≥50 to ≤125 nmol/L) levels (ß inadequate = 1.222, 95% CI: 0.377; 2.067, P = 0.005; ß adequate = 1.228, 95% CI: 0.437; 2.019, P = 0.002). Modelling on a continuous scale revealed grip strength to increase with higher 25-OHD levels up to ~100 nmol/L, after which the direction reversed (ß linear = 0.505, 95% CI: 0.179; 0.830, P = 0.002; ß quadratic = –0.153, 95% CI: –0.269; -0.038, P = 0.009). Older adults showed weaker effects of 25-OHD levels on grip strength than younger adults (ß 25OHDxAge = –0.309, 95% CI: –0.594; –0.024, P = 0.033).
Conclusions
Our findings highlight the importance of sufficient 25-OHD levels for optimal muscle function across the adult life span. However, vitamin D supplementation should be closely monitored to avoid detrimental effects.
Centre de Référence des Maladies Rares du Calcium et du Phosphore Filière de Santé Maladies Rares OSCAR, Paris, France
Centre de Recherche des Cordeliers, INSERM, Sorbonne Université, Université de Paris, INSERM, UMRS1138, Paris, France
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Université Paris-Saclay, Inserm U1185, Physiologie et Physiopathologie Endocriniennes, Assistance Publique-Hôpitaux de Paris, Service d’Endocrinologie et Diabète de l’Enfant, Centre de Référence des Maladies Rares du Calcium et du Phosphore et Filière de Santé Maladies Rares OSCAR, Hôpital Bicêtre Paris Saclay, Le Kremlin-Bicêtre, France
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Centre de Référence des Maladies Rares du Calcium et du Phosphore Filière de Santé Maladies Rares OSCAR, Paris, France
Assistance Publique-Hôpitaux de Paris, Institut Necker-Enfants Malades, INSERM U1151 – CNRS UMR 8253, Paris, France
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Association Francophone de Chirurgie Endocrinienne (AFCE), France
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Assistance Publique-Hôpitaux de Paris, Hôpital Cochin, Biochimie et Génétique Moléculaires, Paris, France
INSERM, U1169, Université Paris Sud, Hôpital Bicêtre, Le Kremlin Bicêtre, France
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INSERM, U1418, CIC-EC, Hôpital Européen Georges Pompidou, Paris, France
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Centre de Référence des Maladies Rares du Calcium et du Phosphore Filière de Santé Maladies Rares OSCAR, Paris, France
Centre de Recherche des Cordeliers, INSERM, Sorbonne Université, Université de Paris, INSERM, UMRS1138, Paris, France
CNRS, ERL8228, Paris, France
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sociodemographic characteristics of the large NutriNet-Sante e-cohort with French Census data: the issue of volunteer bias revisited . Journal of Epidemiology and Community Health 2015 69 893 – 898 . ( https://doi.org/10.1136/jech-2014-205263 ) 10 Mitchell DM
Department of Internal Medicine and Clinical Nutrition, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
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Department of Internal Medicine and Clinical Nutrition, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
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Department of Respiratory Medicine and Allergology, Sahlgrenska University Hospital, Gothenburg, Sweden
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Section for Endocrinology, Department of Medicine, Sahlgrenska University Hospital, Gothenburg, Sweden
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Section for Endocrinology, Department of Medicine, Sahlgrenska University Hospital, Gothenburg, Sweden
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Endocrine Out-Patient Clinic, Carlanderska Hospital, Gothenburg, Sweden
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Lima K Moe RB Epidemiology and health-related quality of life in hypoparathyroidism in Norway . Journal of Clinical Endocrinology and Metabolism 2016 101 3045 – 3053 . ( https://doi.org/10.1210/jc.2016-1477 ) 10 Underbjerg L Sikjaer T
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D Juppner H D'Amour P Fox J Rejnmark L , Hypoparathyroidism in the adult: epidemiology, diagnosis, pathophysiology, target-organ involvement, treatment, and challenges for future research . Journal of Bone and Mineral Research 2011 26 2317
Fondazione Italiana Ricerca sulle Malattie dell’Osso (FIRMO Onlus), Florence, Italy
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designed by the Laboratory of Clinical Epidemiology of the Italian National Research Council on Aging, (INRCA, Florence, Italy) in collaboration with local administrators and primary care physicians of Greve in Chianti and Bagno a Ripoli in the Tuscany
Parathyroid Unit – LIM-28, Laboratório de Cirurgia de Cabeça e Pescoço, Division of Head and Neck Surgery, Department of Surgery, Hospital das Clinicas (HCFMUSP), University of São Paulo School of Medicine (FMUSP), Faculdade de Medicina, Universidade de São Paulo, São Paulo, São Paulo, Brazil
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Endocrine Oncology Division, Institute of Cancer of the State of São Paulo (ICESP), University of São Paulo School of Medicine (FMUSP), Faculdade de Medicina da Universidade de São Paulo (FMUSP), São Paulo, São Paulo, Brazil
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Endocrine Oncology Division, Institute of Cancer of the State of São Paulo (ICESP), University of São Paulo School of Medicine (FMUSP), Faculdade de Medicina da Universidade de São Paulo (FMUSP), São Paulo, São Paulo, Brazil
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P Levine MA Mannstadt MM Bilezikian JP Romanischen AF Thakker RV . Epidemiology and diagnosis of hypoparathyroidism . Journal of Clinical Endocrinology and Metabolism 2016 101 2284 – 2299 . ( https://doi.org/10.1210/jc.2015-3908 ) 18
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rates, precise prediction of MGD would be helpful in planning for the least invasive operation and guiding patients through the risks and advantages of PHPT surgery. The definition, pathogenesis, etiology, and epidemiology of MGD are the main topics of
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M.M. performed interpretation of results and critical revision of the manuscript. F.A. and M.V. critically revised the manuscript. All authors read and approved the final version. References 1 Blüher M . Obesity: global epidemiology and
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Department of Clinical Physiology and Nuclear Medicine, Bispebjerg and Frederiksberg Hospital, Copenhagen, Denmark
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J Bech P . The Danish SF-36 Health Survey: translation and preliminary validity studies . Journal of Clinical Epidemiology 1998 51 991 – 999 . ( https://doi.org/10.1016/S0895-4356(9800091-2 )