CLINICS

Clinics (Sao Paulo). 2017 January; 72(1): 11-16.
doi:10.6061/clinics/2017(01)03

Copyright © 2017 CLINICS

Serum 25-hydroxyvitamin D levels are associated with functional capacity but not with postural balance in osteoporotic postmenopausal women

Guilherme Carlos Brech I II * , Emmanuel Gomes Ciolac III , Mark D Peterson IV , Júlia Maria D’Andréa Greve V

Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, Instituto de Ortopedia e Traumatologia, Laboratório de Estudos do Movimento, São Paulo/SP, Brazil

Universidade Ibirapuera, Fisioterapia, São Paulo/SP, Brazil

Universidade Estadual Paulista Júlio de Mesquita Filho – UNESP, Faculdade de Ciências, Departamento de Educação Física, Bauru/SP, Brazil

University of Michigan-Medicine, Michigan, United States

Faculdade de Medicina da Universidade de São Paulo, Instituto de Ortopedia e Traumatologia, São Paulo/SP, Brazil

*Corresponding author. E-mail: guibrech@gmail.com

received May 12, 2016; revised August 9, 2016; accepted September 30, 2016.

Abstract

OBJECTIVES:

In post-menopausal women with osteoporosis, insufficient vitamin D levels decrease calcium fixation in the bones and calcium transport in the sarcoplasmic reticulum, which impairs muscle strength, possibly leading to detrimental consequences for the preservation of functional capacity and postural balance, fall prevention, and fracture risk. The aim of this study was to evaluate the association between vitamin D levels and knee muscle strength, postural balance and functional mobility among postmenopausal women with osteoporosis.

METHODS:

This cross-sectional study included 63 osteoporotic older women (aged 60.6±3.1 years). The subjects completed the Timed Up and Go Test to measure functional mobility, and postural balance was assessed on the AccuSway Plus portable force platform. Maximal strength was tested using an isokinetic dynamometer for knee flexion and extension. The subjects were assessed as a group and were divided into quartiles according to their vitamin D levels. Clinicaltrials.gov: NCT02771834.

RESULTS:

Vitamin D status was independently associated with the normalized peak torque of the knee extensors (β=0.59; p=0.04) and Timed Up and Go Test (β=-0.07; p<0.001). No between-group differences were observed in the demographic and clinical variables or postural balance; however, significant differences were observed in the Timed Up and Go Test, and the group with the highest vitamin D levels exhibited better performance than the group with the lowest vitamin D levels (p<0.001).

CONCLUSION:

The serum vitamin D levels were independently associated with normalized knee extension strength and functional mobility in postmenopausal women with osteoporosis.

Keywords: Elderly, Muscle Strength, Postural Balance, Sarcopenia, Timed Up and Go Test, Vitamin D


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