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Push-Rate Threshold for Physical Activity Intensity in Persons Who Use Manual Wheelchairs.

Ian M Rice1, Brenda Jeng, Stephanie L Silveira

  • 1From the Department of Kinesiology and Community Health, University of Illinois at Urbana-Champaign, Urbana, Illinois (IMR); and Department of Physical Therapy, University of Alabama at Birmingham, Birmingham, Alabama (BJ, SLS, RWM).

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Manual wheelchair users need accurate physical activity intensity measures. This study established a push-rate cut point, crucial for monitoring and promoting activity in this population.

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Area of Science:

  • Rehabilitation Medicine
  • Exercise Physiology
  • Biomechanics

Background:

  • Manual wheelchair users (MWUs) exhibit low physical activity levels.
  • Existing physical activity intensity cut points, based on steps/min, are unsuitable for MWUs.
  • Accurate intensity quantification is vital for MWU health and exercise prescription.

Purpose of the Study:

  • To investigate the relationship between push rate and energy expenditure in MWUs.
  • To develop a push-rate cut point for moderate-to-vigorous physical activity (MVPA) in MWUs.
  • To provide a tool for public health initiatives and personalized activity monitoring for MWUs.

Main Methods:

  • Seventeen MWUs performed treadmill wheelchair propulsion at 0.7, 1.3, and 2.0 m/sec.
  • Push rate was measured using SMARTwheels.
  • Energy expenditure was assessed via portable metabolic systems measuring oxygen consumption.

Main Results:

  • A strong association was found between push rate and energy expenditure (mean R² = 0.78).
  • The derived push-rate cut point for MVPA was 55.05 pushes/min (SD 26.06).
  • This represents the first validated threshold for MVPA in a diverse MWU group.

Conclusions:

  • Push rate is a valid proxy for energy expenditure in MWUs.
  • The established push-rate cut point can be used to quantify MVPA in MWUs.
  • This finding supports improved physical activity assessment and guidance for MWUs.