Visuomotor Correction is a Robust Contributor to Force Variability During Index Finger Abduction by Older Adults.

We examined aging-related differences in the contribution of visuomotor correction to force fluctuations during index finger abduction via the analysis of two datasets from similar subjects. Study (1) Young (N = 27, 23 ± 8 years) and older adults (N = 14, 72 ± 9 years) underwent assessment of maximum voluntary contraction force (MVC) and force steadiness during constant-force (CF) index finger abduction (2.5, 30, 65% MVC).

Postural Steadiness and Ankle Force Variability in Peripheral Neuropathy.

Introduction: The purpose was to determine the effect of peripheral neuropathy (PN) on motor output variability for ankle muscles of older adults, and the relation between ankle motor variability and postural stability in PN patients.

Methods: Older adults with (O-PN) and without PN (O), and young adults (Y) underwent assessment of standing postural stability and ankle muscle force steadiness.

Results: O-PN displayed impaired ankle muscle force control and postural stability compared with O and Y groups.