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Related Experiment Videos

Measuring physical strain during ambulation with accelerometry.

J B Bussmann1, I Hartgerink, L H van der Woude

  • 1Department of Rehabilitation Medicine, Erasmus University Rotterdam, The Netherlands. bussmann@revd.azr.nL

Medicine and Science in Sports and Exercise
|August 19, 2000
PubMed
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Ambulatory accelerometry accurately measures physical strain during walking, offering a reliable alternative to heart rate monitoring. This method shows high sensitivity and reliability for evaluating changes in walking economy.

Area of Science:

  • Biomechanics
  • Human movement analysis
  • Physiological monitoring

Background:

  • Assessing physical strain during walking is crucial for understanding exercise physiology and rehabilitation.
  • Traditional methods like heart rate monitoring can be influenced by individual variability and require calibration.
  • Ambulatory accelerometry offers a potential objective measure of physical strain.

Purpose of the Study:

  • To evaluate the feasibility of using ambulatory accelerometry to measure physical strain during walking at varying speeds and metabolic costs.
  • To compare the accuracy and reliability of accelerometry-based motility measurements with heart rate reserve (%HRR) and oxygen uptake (VO2).

Main Methods:

  • Twelve healthy subjects underwent treadmill walking tests with increasing speeds and perturbed gait.

Related Experiment Videos

  • Motility (body segment movement intensity via accelerometry), heart rate, and oxygen uptake were simultaneously recorded.
  • Feasibility was assessed by correlating motility with %HRR and VO2, examining sensitivity to changes, and analyzing variability.

    • Main Results:

    • The motility-VO2 relationship demonstrated higher accuracy (r2=0.91) and lower variability than the %HRR-VO2 relationship (r2=0.84).
    • Accelerometry showed superior sensitivity to changes in walking speed and gait perturbations, along with higher test-retest reliability.
    • However, when walking with a brace, accelerometry's accuracy decreased compared to heart rate monitoring.

    Conclusions:

    • Ambulatory accelerometry provides an accurate, low-error method for measuring physical strain in able-bodied individuals without calibration.
    • Further research is needed to explore the utility of motility measurements in patient populations with varying levels of economy.