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Gait adaptations to simultaneous cognitive and mechanical constraints

Experimental Brain Research volume 199, pages 39–48 (2009)Cite this article

Abstract

Previous studies have shown that walking is not a purely automatic motor task but places demands on sensory and cognitive systems. We set out to investigate whether complex walking tasks, as when walking down a steeper gradient while performing a concurrent cognitive task, would demand gait adaptation beyond those required for walking under low-challenge conditions. Thirteen healthy young individuals walked at their self-selected speed on a treadmill at different inclinations (0, −5 and −10%). Gait spatio-temporal measures, pelvis angular excursion, and sacral centre of mass (CoM) motion were acquired while walking or while walking and performing a mental tracking task. Repeated-measures ANOVAs revealed that decreasing treadmill inclination from 0 to −10% resulted in significant decreased walking speed (P < 0.001), decreased stride length (P < 0.001), increased pelvis tilt (P = 0.006) and obliquity variability (P = 0.05), decreased pelvis rotation (P = 0.02), and increased anterio-posterior (A-P) CoM displacement (P = 0.015). Compared to walking alone, walking under dual-task condition resulted in increased step width (P < 0.001), and increased medio-lateral (M-L) CoM displacement (P = 0.039) regardless of inclination grade, while sagittal plane dynamics did not change. Findings suggest that gait adapts differently to cognitive and mechanical constraints; the cognitive system is more actively involved in controlling frontal than sagittal plane gait dynamics, while the reverse is true for the mechanical system. Finally, these findings suggest that gait adaptations maintain the ability to perform concurrent tasks while treadmill walking in healthy young adults.

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Acknowledgments

This study was supported by a grant from the UK Stroke Association (TSA 2007/09) for the Movement Science Group of Oxford Brookes University. Emad Al-Yahya is supported by a grant from the University of Jordan, Amman-Jordan. The authors gratefully acknowledge the assistance of Simon John Hughes in data collection.

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Affiliations

  1. Movement Science Group, School of Life Sciences, Oxford Brookes University, Headington, Oxford, OX3 0BP, UK

    Emad Al-Yahya, Helen Dawes, Johnathan Collett, Ken Howells & Janet Cockburn

  2. Department of Clinical Neurology, University of Oxford, Headington, Oxford, OX3 9DU, UK

    Helen Dawes

  3. School of Technology, Oxford Brookes University, Wheatley, Oxford, OX33 1HX, UK

    Hooshang Izadi

  4. Oxford Centre for Enablement, Nuffield Orthopaedic Centre, Headington, Oxford, OX3 7LD, UK

    Derick T. Wade

Authors
  1. Emad Al-Yahya
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  2. Helen Dawes
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  3. Johnathan Collett
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  4. Ken Howells
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  5. Hooshang Izadi
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  6. Derick T. Wade
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  7. Janet Cockburn
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Correspondence to Emad Al-Yahya.

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Al-Yahya, E., Dawes, H., Collett, J. et al. Gait adaptations to simultaneous cognitive and mechanical constraints. Exp Brain Res 199, 39–48 (2009). https://doi.org/10.1007/s00221-009-1968-1

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  • DOI: https://doi.org/10.1007/s00221-009-1968-1

Keywords

  • Gait control
  • Gait adaptation
  • Cognitive motor interference
  • Centre of mass
  • Pelvis