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Gait stability, variability and complexity on inclined surfaces.

Marcus Fraga Vieira1, Fábio Barbosa Rodrigues2, Gustavo Souto de Sá E Souza2

  • 1Bioengineering and Biomechanics Laboratory, Federal University of Goiás, Goiânia, Brazil; Faculty of Electrical Engineering, Postgraduate Program in Electrical and Biomedical Engineering, Centre for Innovation and Technology Assessment in Health, Federal University of Uberlândia, Brazil.

Journal of Biomechanics
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Summary
This summary is machine-generated.

Walking on inclined surfaces, especially uphill, significantly reduces gait stability and alters movement patterns in healthy adults. Inclines increase trunk variability and decrease gait complexity, impacting balance control.

Keywords:
Gait variabilityInclined walkingMargin of stabilityMaximum Lyapunov exponentNonlinear analysis

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Area of Science:

  • Biomechanics
  • Human locomotion
  • Gait analysis

Background:

  • Gait stability and variability are crucial for preventing falls.
  • Inclined surfaces present unique challenges to normal walking patterns.
  • Understanding gait adaptations on slopes is important for mobility and fall risk assessment.

Purpose of the Study:

  • To evaluate the effects of different treadmill inclinations (upward and downward) on gait stability, variability, and complexity in healthy young adults.
  • To quantify changes in gait parameters under varying incline conditions.

Main Methods:

  • 49 healthy young adults walked on a treadmill at preferred speed for 4 minutes under horizontal (0%), upward (6%, 8%, 10%), and downward (6%, 8%, 10%) incline conditions.
  • Gait variability was measured using trunk acceleration standard deviation (VAR).
  • Gait stability was assessed using margin of stability (MoS) and maximum Lyapunov exponent (λs). Gait complexity was measured using sample entropy (SEn).

Main Results:

  • Trunk variability (VAR) increased in all directions (medial-lateral, anterior-posterior, vertical) on inclined surfaces.
  • Gait complexity (SEn) decreased linearly from downward to upward inclines, indicating longer, slower steps.
  • Downward inclines showed highest variability and lowest MoS in the medial-lateral direction.
  • Upward inclines demonstrated reduced stability, evidenced by larger λs values.

Conclusions:

  • Inclined surfaces, particularly upward inclines, significantly decrease gait stability and alter gait variability and complexity in healthy young adults.
  • Adaptations in gait patterns, such as slower and longer steps, occur on inclines to maintain balance.
  • These findings highlight the increased challenge to postural control posed by inclined walking.