Presentation Title

Long-range correlations of center of pressure are stronger for AP perturbations than ML perturbations in healthy young adults

Advisor Information

Mukul Mukherjee

Location

Dr. C.C. and Mabel L. Criss Library

Presentation Type

Poster

Start Date

4-3-2016 12:45 PM

End Date

4-3-2016 2:15 PM

Abstract

Control of center of pressure (COP) in anterior-posterior and medio-lateral directions use different mechanisms. Biological signals like COP have a fractal structure with long-range correlations (LRCs) such that postural sway at one point of time are related to postural sway at another point in time. Recent studies have shown that the LRCs of a healthy system can be driven towards a specific direction by administering a sensory input with the desired temporal structure We used signals with different temporal structures to perturb the support surface in AP and ML directions and examined the LRCs of resultant COP patterns. LRCs of COP during support surface translations in AP and ML directions were significantly different (p=0.001). This may be due to differences in the alignment of body segments and muscles required for the activation of forces to maintain stability when perturbed in these directions. LRCs of COP were significantly different in response to different noise conditions (p<0.0001). This shows that healthy individuals show adaptive flexibility in their ability to entrain their COP response to support surface oscillations with different temporal structures. Exploring the temporal structure of biological processes has provided many new insights into movement control. Because aging and disease are characterized by a degradation of this temporal structure it is important to investigate new ways to restore this highly complex structure.

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COinS
 
Mar 4th, 12:45 PM Mar 4th, 2:15 PM

Long-range correlations of center of pressure are stronger for AP perturbations than ML perturbations in healthy young adults

Dr. C.C. and Mabel L. Criss Library

Control of center of pressure (COP) in anterior-posterior and medio-lateral directions use different mechanisms. Biological signals like COP have a fractal structure with long-range correlations (LRCs) such that postural sway at one point of time are related to postural sway at another point in time. Recent studies have shown that the LRCs of a healthy system can be driven towards a specific direction by administering a sensory input with the desired temporal structure We used signals with different temporal structures to perturb the support surface in AP and ML directions and examined the LRCs of resultant COP patterns. LRCs of COP during support surface translations in AP and ML directions were significantly different (p=0.001). This may be due to differences in the alignment of body segments and muscles required for the activation of forces to maintain stability when perturbed in these directions. LRCs of COP were significantly different in response to different noise conditions (p<0.0001). This shows that healthy individuals show adaptive flexibility in their ability to entrain their COP response to support surface oscillations with different temporal structures. Exploring the temporal structure of biological processes has provided many new insights into movement control. Because aging and disease are characterized by a degradation of this temporal structure it is important to investigate new ways to restore this highly complex structure.