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Effect of forward lean on postural ankle dynamics

T Sinha1, B E Maki

  • 1Centre for Studies in Aging, Sunnybrook Health Science Centre, Canada.

IEEE Transactions on Rehabilitation Engineering : a Publication of the IEEE Engineering in Medicine and Biology Society
|December 1, 1996
PubMed
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Forward leaning does not increase ankle stiffness during postural control. While muscle impedance rose, reflex activity decreased, suggesting other reasons for forward lean in balance.

Area of Science:

  • Biomechanics
  • Human postural control
  • Neuroscience

Background:

  • Forward leaning is observed in postural control under specific conditions.
  • The hypothesis that forward lean enhances postural ankle dynamics by increasing stiffness was investigated.

Purpose of the Study:

  • To evaluate the effect of forward lean on dynamic postural responses.
  • To test if forward lean increases the effective stiffness of postural ankle dynamics.

Main Methods:

  • A systems modeling approach was used with four healthy adults.
  • Continuous random antero-posterior platform acceleration was applied.
  • Ankle joint motion was constrained, and responses analyzed via center-of-pressure, EMG, and kinematic data to partition ankle torque into impedance and reflex components.

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Main Results:

  • Forward lean did not consistently alter ankle dynamics.
  • Increased muscle impedance during forward lean was offset by decreased net reflex ankle torque.
  • Decreased phasic dorsiflexor activity, not plantarflexor activity, accounted for the change in reflex torque.

Conclusions:

  • Forward lean does not appear to stiffen overall postural ankle dynamics.
  • The findings suggest that forward lean serves purposes other than enhancing ankle stiffness for postural control.