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Gait modification when decreasing double support percentage.

Daniel S Williams1, Anne E Martin1

  • 1Department of Mechanical and Nuclear Engineering, Pennsylvania State University, 137 Reber Building, University Park, PA 16802, USA.

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|June 8, 2019
PubMed
Summary
This summary is machine-generated.

Altering the double support (DS) period of gait affects walking stability. Decreasing DS percentage mimics increased walking speed, while increasing DS percentage proved difficult, suggesting slower walking speeds naturally increase DS time.

Keywords:
Double supportGaitJoint kinematicsWalking

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Area of Science:

  • Biomechanics
  • Human locomotion
  • Gait analysis

Background:

  • Walking stability is crucial for mobility, yet specific gait parameters influencing it remain unclear.
  • The double support (DS) period, where both feet are on the ground, is hypothesized to enhance stability due to increased control.
  • The relationship between walking speed and DS duration is known, but its independent effect on gait stability requires investigation.

Purpose of the Study:

  • To investigate the effects of altering the double support (DS) percentage on human gait dynamics, independent of walking speed.
  • To determine how modifying DS duration influences gait parameters such as joint kinematics and ground reaction forces.
  • To understand the adaptability of gait control when manipulating the DS period.

Main Methods:

  • Sixteen healthy young adults walked on a treadmill at a constant speed.
  • Participants performed trials with normal, decreased, and increased double support (DS) percentages.
  • Gait parameters including cadence, joint motion, and ground reaction forces were analyzed.

Main Results:

  • Participants could decrease DS percentage but struggled to increase it, sometimes altering cadence.
  • Decreasing DS percentage led to gait changes similar to increased walking speed, primarily affecting the swing phase (e.g., increased hip/knee flexion, higher foot clearance).
  • Attempts to increase DS percentage showed trends similar to decreased walking speed.

Conclusions:

  • Altering the double support (DS) percentage independently influences gait parameters, producing distinct changes compared to speed variations.
  • The difficulty in increasing DS percentage at a constant speed suggests an inherent preference for slower walking speeds to prolong this stability-providing phase.
  • Findings indicate that DS duration is a key, adaptable component of gait control influencing stability.