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Evaluating Postural Control and Lower-extremity Muscle Activation in Individuals with Chronic Ankle Instability

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Postural Steadiness and Ankle Force Variability in Peripheral Neuropathy.

Roger J Paxton¹, Caitlin Feldman-Kothe, Megan K Trabert

¹Dept. of Health and Exercise Science, Colorado State University, Fort Collins, CO.

|August 19, 2015

Summary

Older adults with peripheral neuropathy (PN) exhibit poorer ankle muscle control and balance. This ankle muscle dyscontrol is linked to increased postural instability, affecting physical function.

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Area of Science:

Neuroscience
Gerontology
Biomechanics

Background:

Peripheral neuropathy (PN) is a condition affecting older adults.
PN can impact motor control and balance.

Purpose of the Study:

To investigate the effect of PN on ankle muscle motor output variability in older adults.
To examine the relationship between ankle motor variability and postural stability in older adults with PN.

Main Methods:

Comparison of standing postural stability and ankle muscle force steadiness across three groups: older adults with PN (O-PN), older adults without PN (O), and young adults (Y).

Main Results:

Older adults with PN demonstrated significantly impaired ankle muscle force control and reduced postural stability compared to both older adults without PN and young adults.
A moderate positive correlation was found between the amplitude of plantarflexor force fluctuations and postural stability in the O-PN group under eyes-closed conditions (r = .54, p = .01).

Conclusions:

The findings suggest that impaired ankle muscle control contributes to the postural instability observed in older adults with PN.
Ankle muscle dyscontrol is a significant factor impacting physical function and fall risk in this population.