Perception of the postural vertical and falls in older people.

Abstract:

BACKGROUND:Research on the relationship between vestibular function and falls in older people is sparse. The perception of the postural vertical (PPV) provides an indicator measure of vestibular (otolith) function in the absence of visual input and diminished somatosensory feedback. OBJECTIVE:This study examined whether impaired PPV is associated with falls in this group. METHODS:One hundred and ninety-five people aged 70 plus years stood blindfolded on a motorised platform that could be tilted in the roll plane and attempted to adjust it so that their bodies were aligned to the vertical. Somatosensory feedback was minimised as the base and vertical support surfaces on the tilting platform were covered in thick soft foam rubber. PPV error from true vertical and PPV variability (°) were calculated. Participants also underwent an assessment of distal tactile sensitivity and the physiological profile assessment (PPA); fallers were defined as those who had one or more falls during a prospective 12-month follow-up period. RESULTS:Eighty-eight participants (45%) reported falling in the follow-up year. Increased PPV error and variability were correlated with increased lateral sway in a condition of absent visual input and reduced foot somatosensory feedback (eyes closed/foam; r range = 0.16-0.20, p < 0.05) and with composite PPA fall risk scores (r range = 0.22-0.26, p < 0.05). PPV variability was a significant and independent predictor of falls after adjusting for the composite PPA scores, age and gender [adjusted RR = 1.42 (1.01-1.98)]. CONCLUSIONS:Older people with increased PPV variability are at increased risk of falls. These findings indicate that assessment of PPV may augment fall risk assessments in older people.

journal_name

Gerontology

journal_title

Gerontology

authors

Menant JC,St George RJ,Fitzpatrick RC,Lord SR

doi

10.1159/000339295

subject

Has Abstract

pub_date

2012-01-01 00:00:00

pages

497-503

issue

6

eissn

0304-324X

issn

1423-0003

pii

000339295

journal_volume

58

pub_type

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