Article

Due to inconsistent findings, the influence of vitamin D on
postural body sway (PBS) is currently under debate. This study evaluated the
impact of vitamin D on PBS with regards to different foot positions and eye
opening states in community-dwelling older individuals. METHODS: In a
cross-sectional study, we assessed PBS in 342 older individuals (264 females
[average age (+/- SD): 68.3 +/- 9.0 years], 78 males [65.7 +/- 9.6 years]). A
detailed medical history and vitamin D level were obtained for each individual.
Fall risk was evaluated using the New York-Presbyterian Fall Risk Assessment Tool
(NY PFRA). PBS parameters (area, distance, velocity, frequency) were evaluated on
a pressure plate with feet in closed stance (CS) or hip-width stance (HWS), open
eyes and closed eyes. Statistical analysis included logarithmic mixed models for
repeated measures with the MIXED model procedure to test the influence of vitamin
D (categorized in <10 mug/l, 10-20 mug/l, 21-30 mug/l, >30 mug/l), foot position,
eye opening state, age, sex and frequency of physical activity on PBS. RESULTS:
Vitamin D was not an independent risk factor for falls experienced in the last 12
months. Nonetheless, PBS was higher in patients with vitamin D deficiency (<10
mug/l) in HWS (A/P p=0.028 and area p=0.037). Additionally, vitamin D deficiency
intensified the deleterious effects of male sex (distance p=0.002) and absence of
vision (area p<0.001) on PBS. CONCLUSION: Independent risk factors for increased
PBS like male sex and absence of vision are additionally compromised by vitamin D
deficiency.
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