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Related Experiment Videos

Wheelchair coasting downhill is a reliable work task.

Dennis G. O'Connell1, Byron Russell, F.A. Acosta

  • 1Hardin-Simmons University, Department of Physical Therapy, Abilene, TX 79898, USA.

Work (Reading, Mass.)
|November 21, 2002
PubMed
Summary

Physiological responses during wheelchair ergometry are reliable. This study found consistent oxygen consumption, ventilation, and heart rate measurements in untrained users across various speeds and inclines, indicating dependable data for research.

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Area of Science:

  • Exercise Physiology
  • Rehabilitation Science
  • Biomechanics

Background:

  • Wheelchair ergometry is crucial for assessing physical capacity in wheelchair users.
  • Understanding the reliability of physiological measurements is essential for accurate research and clinical assessments.
  • Submaximal ergometry provides a safe and effective method for evaluating cardiovascular and respiratory function.

Purpose of the Study:

  • To determine the test-retest reliability of physiological responses during submaximal wheelchair ergometry on a treadmill.
  • To assess the consistency of oxygen consumption, minute ventilation, and heart rate measurements.
  • To evaluate reliability across different speeds and inclines, including downhill conditions.

Main Methods:

  • Employed a test-retest design with untrained participants (4 males, 3 females, aged 22-43).

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  • Participants performed 4-minute work bouts on a wheelchair treadmill at speeds from 1-4 km/hr and inclines from 0 to -4 degrees.
  • Measured oxygen consumption (VO2), minute ventilation (VE), and heart rate (HR) under steady-state conditions, with each condition tested twice.

    • Main Results:

    • High test-retest reliability was observed for absolute oxygen consumption (R=0.84-0.99), minute ventilation (R=0.86-0.98), and heart rate (R=0.95-1.0).
    • Average percentage differences between repeated tests were less than 3% for all measured variables.
    • Physiological responses demonstrated consistency across the range of tested speeds and inclinations.

    Conclusions:

    • Submaximal wheelchair ergometry on a treadmill exhibits high physiological test-retest reliability in untrained individuals.
    • The findings support the use of this ergometry method for consistent and dependable physiological data collection.
    • Reliable measurements of VO2, VE, and HR can be obtained across various speeds and inclines, including downhill conditions.