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Performance of additional tasks disturbs postural control in elderly. It is unknown, however, how
postural control is affected in elderly fallers and non-fallers in a reduced sensory situation.
To compare differences between single and dual tasking in three test conditions; (1) no-vision, (2) under
reduced somatosensory information and (3) with a combination of both conditions.
An observational cohort study with participants assigned to a 12-month pretest fall assessment and a postural
Fifteen independently living elderly participated (77.5 ± 7.0 [63-87] years). Falls were pre-assessed with a 1-
year monthy “fall calendar”. Postural control was analyzed by means of a force platform. Participants were standing quiet
(first task) while counting backwards (second task). A 2-factor (group x condition) ANOVA was performed at p<.05.
Differences of postural (DTCp) and cognitive dual task costs (DTCc) between test conditions were analyzed (one-way
The analysis showed significant group (fallers/non-fallers) and condition effects. Post hoc analyses indicated that
the postural control variables were significantly different during the concurrent reduced vision and somatosensory
Dual task costs showed a significant difference between normal (N) and the combined condition (NV+RP) in non-fallers.
The combination of reduced visual and somatosensory information causes a larger disturbance of postural
stability compared with the reduction of visual or somatosensory information alone. Non-fallers seem to have no threats to
the postural control stability in this combined reduced sensory situation. They reduce their postural control, which leaves
them enough resources to compensate for the reduced sensory information.