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Identification of the Anaerobic Threshold Using Double Product in Patients With Coronary Artery Disease

  • Peter H Brubaker
    Correspondence
    Dr. Brubaker, Cardiac Rehabilitation Program, Departments of Medicine and Health & Exercise Science, Box 7628, Reynolda Station, Winston-Salem, North Carolina 27109.
    Affiliations
    Cardiac Rehabilitation Program, Departments of Medicine and Health & Exercise Science, Wake Forest University, Winston-Salem, North CarolinaUSA

    Exercise Physiology Laboratory, Fukuoka University, Fukuoka, Japan
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  • Akira Kiyonaga
    Affiliations
    Cardiac Rehabilitation Program, Departments of Medicine and Health & Exercise Science, Wake Forest University, Winston-Salem, North CarolinaUSA

    Exercise Physiology Laboratory, Fukuoka University, Fukuoka, Japan
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  • Brett A Matrazzo
    Affiliations
    Cardiac Rehabilitation Program, Departments of Medicine and Health & Exercise Science, Wake Forest University, Winston-Salem, North CarolinaUSA

    Exercise Physiology Laboratory, Fukuoka University, Fukuoka, Japan
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  • William E Pollock
    Affiliations
    Cardiac Rehabilitation Program, Departments of Medicine and Health & Exercise Science, Wake Forest University, Winston-Salem, North CarolinaUSA

    Exercise Physiology Laboratory, Fukuoka University, Fukuoka, Japan
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  • Munehiro Shindo
    Affiliations
    Cardiac Rehabilitation Program, Departments of Medicine and Health & Exercise Science, Wake Forest University, Winston-Salem, North CarolinaUSA

    Exercise Physiology Laboratory, Fukuoka University, Fukuoka, Japan
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  • Henry S Miller Jr
    Affiliations
    Cardiac Rehabilitation Program, Departments of Medicine and Health & Exercise Science, Wake Forest University, Winston-Salem, North CarolinaUSA

    Exercise Physiology Laboratory, Fukuoka University, Fukuoka, Japan
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  • Hiroaki Tanaka
    Affiliations
    Cardiac Rehabilitation Program, Departments of Medicine and Health & Exercise Science, Wake Forest University, Winston-Salem, North CarolinaUSA

    Exercise Physiology Laboratory, Fukuoka University, Fukuoka, Japan
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      Abstract

      This study compared the ventilatory threshold with the double-product break point in 104 patients with cardiovascular disease during ramp treadmill testing. The high correlation (r = 0.81) between the double-product break point and the ventilatory threshold, even in patients taking β blockers, suggests the former method is a viable noninvasive alternative for identifying the anaerobic threshold in patients with cardiovascular disease, particularly when expired gas analysis is not appropriate or available.
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