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Proactive balance strategy while maintaining a stationary wheelie.

J P Bonaparte1, R L Kirby, D A Macleod

  • 1School of Health and Human Performance, Dalhousie University, Halifax, NS, Canada.

Archives of Physical Medicine and Rehabilitation
|April 11, 2001
PubMed
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Wheelchair users performing a stationary wheelie utilize a proactive balance strategy, not a reactive one. They adjust their position to maintain balance, demonstrating a larger functional base of support than geometrically defined.

Area of Science:

  • Biomechanics
  • Human motor control
  • Sports science

Background:

  • Maintaining balance during dynamic activities like wheelchair wheelies is crucial for user control and safety.
  • Understanding the underlying balance strategies can inform training and rehabilitation.

Purpose of the Study:

  • To investigate whether a reactive or proactive balance strategy is employed during stationary wheelchair wheelies.
  • To determine the relationship between wheelchair pitch and linear displacement during a wheelie.

Main Methods:

  • Descriptive and quantitative kinematic analysis was performed in a kinesiologic laboratory.
  • Ten able-bodied adults were taught to perform and maintain a stationary wheelie for 15 seconds.
  • Pitch angle and rear-wheel position were analyzed from digitized videotape, including time-series analysis for phase lag.

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Main Results:

  • An inverse relationship was observed between pitch direction and linear displacement: rear pitch correlated with forward displacement, and forward pitch with rearward displacement.
  • Little to no phase lag was detected between pitch and displacement, suggesting a coordinated response.
  • The mean pitch angle was 13.6 ± 2.3 degrees, with minimal mean horizontal displacement (0.0 ± 4.9 cm).

Conclusions:

  • Wheelchair users performing stationary wheelies appear to employ a proactive balance strategy.
  • This proactive strategy involves utilizing a functional base of support larger than the geometric one.
  • Findings offer insights into dynamic balance principles applicable to learning and teaching wheelie techniques.