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Understanding ageing effects using complexity analysis of foot–ground clearance during walking

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  • Chandan Karmakar
  • Ahsan Khandoker
  • Rezaul Begg
  • Marimuthu Palaniswami

Abstract

Ageing influences gait patterns which in turn can affect the balance control of human locomotion. Entropy-based regularity and complexity measures have been highly effective in analysing a broad range of physiological signals. Minimum toe clearance (MTC) is an event during the swing phase of the gait cycle and is highly sensitive to the spatial balance control properties of the locomotor system. The aim of this research was to investigate the regularity and complexity of the MTC time series due to healthy ageing and locomotors' disorders. MTC data from 30 healthy young (HY), 27 healthy elderly (HE) and 10 falls risk (FR) elderly subjects with balance problems were analysed. Continuous MTC data were collected and using the first 500 data points, MTC mean, standard deviation (SD) and entropy-based complexity analysis were performed using sample entropy (SampEn) for different window lengths (m) and filtering levels (r). The MTC SampEn values were lower in the FR group compared to the HY and HE groups for all m and r. The HY group had a greater mean SampEn value than both HE and FR reflecting higher complexity in their MTC series. The mean SampEn values of HY and FR groups were found significantly different for m = 2, 4, 5 and r = (0.1–0.9) × SD, (0.3–0.9) × SD and (0.3–0.9) × SD, respectively. They were also significant difference between HE and FR groups for m = 4–5 and r = (0.3–0.7) × SD, but no significant differences were seen between HY and HE groups for any m and r. A significant correlation of SampEn with SD of MTC was revealed for the HY and HE groups only, suggesting that locomotor disorders could significantly change the regularity or the complexity of the MTC series while healthy ageing does not. These results can be usefully applied to the early diagnosis of common gait pathologies.

Suggested Citation

  • Chandan Karmakar & Ahsan Khandoker & Rezaul Begg & Marimuthu Palaniswami, 2013. "Understanding ageing effects using complexity analysis of foot–ground clearance during walking," Computer Methods in Biomechanics and Biomedical Engineering, Taylor & Francis Journals, vol. 16(5), pages 554-564, May.
    • Handle: RePEc:taf:gcmbxx:v:16:y:2013:i:5:p:554-564
    DOI: 10.1080/10255842.2011.628943
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    References listed on IDEAS

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    1. Costa, M. & Peng, C.-K. & L. Goldberger, Ary & Hausdorff, Jeffrey M., 2003. "Multiscale entropy analysis of human gait dynamics," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 330(1), pages 53-60.
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    1. Abdulrahman Al Bochi & Ghazaleh Delfi & Tilak Dutta, 2021. "A Scoping Review on Minimum Foot Clearance: An Exploration of Level-Ground Clearance in Individuals with Abnormal Gait," IJERPH, MDPI, vol. 18(19), pages 1-23, September.

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