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Determining The Electromyographic Fatigue Threshold Following a Single Visit Exercise Test
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Estimating peak work rate during incremental cycle ergometry from the 6-minute walk distance: differences between

A E Holland1, K Hill, J A Alison

  • 1School of Physiotherapy, La Trobe University, Melbourne, Vic., Australia. a.holland@alfred.org.au

Respiration; International Review of Thoracic Diseases
|April 2, 2010
PubMed
Summary

Estimating peak exercise capacity in chronic obstructive pulmonary disease (COPD) using the 6-minute walk distance (6MWD) shows significant variation between prediction equations. These differences impact exercise prescription for pulmonary rehabilitation.

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Area of Science:

  • Pulmonary rehabilitation
  • Exercise physiology
  • Chronic obstructive pulmonary disease (COPD) research

Background:

  • Optimizing exercise training intensity is crucial for pulmonary rehabilitation outcomes.
  • Prescribing cycle ergometry is challenging without knowing peak work rate.
  • Two regression equations estimate peak cycle work rate from 6-minute walk distance (6MWD) in COPD patients.

Purpose of the Study:

  • To compare peak work and target training work rate (60% peak) estimates from two published regression equations.
  • To assess the agreement between these prediction methods.

Main Methods:

  • Sixty-four COPD subjects (mean age 70 years, FEV1 49% predicted) performed a standardized 6-minute walk test.
  • Peak work estimates were calculated using two regression equations.
  • Agreement between equations was analyzed using Bland and Altman plots.

Main Results:

  • Substantial variation in peak work estimates between equations (up to 75 Watts difference, 35% coefficient of variation).
  • Differences were more pronounced in men than women.
  • Estimated training work rates differed by over 20 Watts in 28% of subjects.

Conclusions:

  • Reference equations for predicting peak cycle work rate from 6MWD show significant and systematic variations.
  • Further research is needed to validate these equations for exercise prescription in pulmonary rehabilitation.