Presentation Title

Temporal correlations of support surface movement affect the control of center of pressure velocity

Presenter Information

Troy RandFollow

Advisor Information

Mukul Mukherjee

Location

UNO Criss Library, Room 249

Presentation Type

Oral Presentation

Start Date

3-3-2017 11:00 AM

End Date

3-3-2017 11:15 AM

Abstract

Interacting with changing environments is a key feature of postural control. Center of pressure velocity (COPv) can be used to explore postural responses to environmental changes. The COPv exhibits two scaling behaviors, persistence (short time-scale) and anti-persistence (longer time-scale). The crossover point where these scaling regions change indicate the period of the COPv oscillation, or how much time the COPv increases and decreases before changing directions. Little is known about how the COPv oscillation period changes during different postural demands. The goal of this research was to investigate the postural response to support surface translations of different temporal correlations and average movement velocities. Participants stood on the Neurocom while the support surface was translated in the anteroposterior direction with white noise, pink noise or sine wave at six different movement velocities. The time scale where the COPv switched from persistent to anti-persistent was measured using detrended fluctuation analysis. As the velocity of movement increased, the time scale of COPv oscillations increased for sine wave and decreased for pink and white noise. This indicates that when the movement has a high temporal correlation and the average movement velocity is increased, the COPv has a longer oscillation period. When there is moderate or no temporal correlation and movement velocity is increased, the COPv oscillation period becomes shorter. From a motor learning or rehabilitation perspective, this information can be used to tailor training paradigms to elicit the desired response.

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Mar 3rd, 11:00 AM Mar 3rd, 11:15 AM

Temporal correlations of support surface movement affect the control of center of pressure velocity

UNO Criss Library, Room 249

Interacting with changing environments is a key feature of postural control. Center of pressure velocity (COPv) can be used to explore postural responses to environmental changes. The COPv exhibits two scaling behaviors, persistence (short time-scale) and anti-persistence (longer time-scale). The crossover point where these scaling regions change indicate the period of the COPv oscillation, or how much time the COPv increases and decreases before changing directions. Little is known about how the COPv oscillation period changes during different postural demands. The goal of this research was to investigate the postural response to support surface translations of different temporal correlations and average movement velocities. Participants stood on the Neurocom while the support surface was translated in the anteroposterior direction with white noise, pink noise or sine wave at six different movement velocities. The time scale where the COPv switched from persistent to anti-persistent was measured using detrended fluctuation analysis. As the velocity of movement increased, the time scale of COPv oscillations increased for sine wave and decreased for pink and white noise. This indicates that when the movement has a high temporal correlation and the average movement velocity is increased, the COPv has a longer oscillation period. When there is moderate or no temporal correlation and movement velocity is increased, the COPv oscillation period becomes shorter. From a motor learning or rehabilitation perspective, this information can be used to tailor training paradigms to elicit the desired response.