The Role of Foot Regions and the Contribution of Somatosensory Information to Quiet Stance

Date

2024-4-26

Author

Hassanpour, Seyedehmaryam

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This thesis investigates the effect of foot somatosensory during quiet stance at eyes open and closed conditions. Ten healthy right handed and footed male subjects were recruited and tested before and after foot somatosensory loss due to the injection of an anesthetic around the nervus tibialis. Force and moment signals were collected by using a force plate, while a pressure pad was used to estimate overall and regional center-of-pressure (CoP) signals at the anteroposterior (AP) direction. 90 seconds long data in quiet stance with three repetitions were collected . The overall and regional mean pressure and percent weight due to the foot regions, the Root Mean Square (RMS), variance, and RMS velocity were calculated through overall and regional CoPx signals. Power Spectral Density Function was used to estimate centroidal frequency (CFREQ), 50% and 90% power, and frequency dispersion (FD). The hind region had the highest pressure of around 80, while the front and mid region presented around 40 and 25 kPa. Overall CoPx magnitude and velocity increased significantly after the eyes closed. RMS regional CoPx increased in the front foot while decreased at the mid foot at somatosensory loss. The velocity RMS was significantly larger on the left foot and smaller on the hind. RMS velocity was higher at front foot compared to midfoot on the left, while it was smaller on the right. 90% power frequency and FD decreased significantly at eyes closed. CFREQ of regional CoPx was significantly higher on the left foot and mid foot. After the injection, the 50% Power frequency increased at the fore and midfoot regions in the eyes closed condition. In this thesis it has been shown that foot somatosensory has a considerable impact on the control of human erect posture.

Subject Keywords

Postural Control, Quiet Stance, Somatosensory Loss, Foot Regions

URI

https://hdl.handle.net/11511/109804

Collections

Graduate School of Natural and Applied Sciences, Thesis