How is the anaerobic threshold defined in a cardiopulmonary stress test?

Updated: May 14, 2020
  • Author: Kevin McCarthy, RPFT; Chief Editor: Nader Kamangar, MD, FACP, FCCP, FCCM  more...
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The anaerobic threshold is defined as the workload (expressed as VO2) in which blood lactate levels rise significantly (>4mmol/L), indicating that a significant fraction of the work is being accomplished by anaerobic metabolic sources. The establishment of the anaerobic threshold may have clinical importance, particularly when the evaluation seeks to determine the presence of an occupational disability.

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