Aerobic fitness in patients with fibrositis. A controlled study of respiratory gas exchange and 133xenon clearance from exercising muscle

Authors

  • Robert M. Bennett MD, MRCP,

    Professor of Medicine and Director
    1. Departments of Medicine, Surgery, and Clinical Pathology, The Oregon Health Sciences University, Portland
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    • Division of Arthritis and Rheumatic Diseases

  • Sharon R. Clark MN, FNP,

    Research Assistant Professor of Medicine; L
    1. Departments of Medicine, Surgery, and Clinical Pathology, The Oregon Health Sciences University, Portland
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  • Linn Goldberg MN MD,

    1. Departments of Medicine, Surgery, and Clinical Pathology, The Oregon Health Sciences University, Portland
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  • Donna Nelson MD,

    Professor of Surgery
    1. Departments of Medicine, Surgery, and Clinical Pathology, The Oregon Health Sciences University, Portland
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  • R. Peter Bonafede MD,

    1. Departments of Medicine, Surgery, and Clinical Pathology, The Oregon Health Sciences University, Portland
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  • John Porter MD,

    Professor of Surgery
    1. Departments of Medicine, Surgery, and Clinical Pathology, The Oregon Health Sciences University, Portland
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  • David Specht MD

    Assistant Professor of Nuclear Medicine
    1. Departments of Medicine, Surgery, and Clinical Pathology, The Oregon Health Sciences University, Portland
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Abstract

Aerobic fitness was evaluated in 25 women with fibrositis, by having them exercise to volitional exhaustion on an electronically braked cycle ergometer. Compared with published standards, >80% of the fibrositis patients were not physically fit, as assessed by maximal oxygen uptake. Compared with matched sedentary controls, fibrositis patients accurately perceived their level of exertion in relation to oxygen consumption and attained a similar level of lactic acidosis, as assessed by their respiratory quotient and ventilatory threshold. Exercising muscle blood flow was estimated by 133xenon clearance in a subgroup of 16 fibrositis patients and compared with that in 16 matched sedentary controls; the fibrositis patients exhibited reduced 133xenon clearance. These results indicate a need to include aerobic fitness as a matched variable in future controlled studies of fibrositis and suggest that the “detraining phenomenon” may be of relevance to the etiopathogenesis of the disease.

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