Clinics (Sao Paulo). 2017 January; 72(1): 11-16.
Copyright © 2017 CLINICS
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:
received May 12, 2016; revised August 9, 2016; accepted September 30, 2016.
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.
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.
Vitamin D status was independently associated with the normalized peak torque of the knee extensors (β=0.59;
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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