Effect of Vitamin D Status on Postural Stability in Elderly Assessed by Motor Control Test
Journal Title: Macedonian Journal of Medical Sciences (MJMS) - Year 2009, Vol 2, Issue 4
Abstract
Background. Vitamin D plays an important role in muscle function and physical performance and helps in maintaining the postural stability. Aim. The aim of the present study is to evaluate the effect of vitamin D status on postural stability using Motor Control Test. Subjects and methods. Sixty apparently healthy male individuals with age 67 ± 5.03 years were recruited for this study. They were divided according to vitamin D status into 31 subjects with vitamin D deficiency and 29 age matched subjects with optimal vitamin D levels as control group. All subjects were evaluated for postural stability using motor control test (MCT) (The SMART Balance Master, NeuroCom International, Inc., Clackamas, OR, USA). The MCT assesses the ability of the motor control system to recover from an unpredictable forward or backward perturbation. The composite latencies of the motor responses (in msec) were estimated, and describe the overall level of performance during all the MCT trials. Results. Composite latencies of the motor responses (193.7 ± 8.6 msec) are significantly prolonged in vitamin D deficiency group in comparison with the control group (129.5 ± 10.01 msec). Also latency of the active motor response in medium and large backward and forward translations are significantly prolonged in vitamin D deficiency group in comparison with the control group. Moreover, serum 25(OH) D levels and serum PTH levels were significantly correlated with BMI (r= -0.384 & r= 0.363), serum calcium (r= 0.302 & r= -0.303), composite latencies of the motor responses (r= -0.944 & r= 0.942), and latency of the patient’s active motor response in medium and large backward and forward translations in all studied subjects. Conclusions. We concluded that prolonged latencies of motor responses in vitamin D deficiency are likely to reflect a reduction of muscle strength of elderly subjects which may be the main cause for postural instability. Vitamin D was correlated with the parameters that assess postural instability in the elderly using motor control test, that may suggest a link that may help in understanding the postural instability in vitamin D deficient individuals.We recommend further studies to explore the hidden mechanisms that play a role in postural instability in vitamin D deficient individuals.
Authors and Affiliations
Ahmed A. Emam| Internal Medicine Department, National Research Center, Dokki, Giza, Egypt, Adela M. Gad| Internal Medicine Department, Al-Azhar University, Cairo, Egypt, Mohieldin M. Ahmed| Rheumatology & Rehabilitation Department, Al-Azhar University, Cairo, Egypt, Adel A. Mahmoud| Internal Medicine, Ain Shams University.Cairo, code 12311, Egypt, Adel A. Al-Azab| Clinical Pathology Department, Ain Shams University,.Cairo, code 12311, Egypt
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- EP ID EP8712
- DOI 10.3889/MJMS.1857-5773.2009.0070
- Views 324
- Downloads 22
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