What cardiopulmonary exercise test patterns suggest
| Nonspecific: suggest significant cardiopulmonary or metabolic impairment of any sort Peak Vo2 < 80% of predicted Ve/Vco2 slope > 34 Ventilatory (anaerobic) threshold < 40% of peak Vo2 |
| Deconditioning Low-normal peak Vo2 Low ventilatory (anaerobic) threshold Absence of any other abnormal responses |
| Obesity Increased Vo2/work slope Indexed peak Vo2 (mL/kg/min) less than predicted Absolute Vo2 (L/min) normal or greater than predicted Oxygen indexed to lean body mass normal or greater than predicted |
| Cardiac limitations Oxygen pulse (O2 -pulse) < 80% predicted or flattened or falling curve Chronotropic incompetence Heart rate recovery ≤ 12 beats per minute after 1 minute of recovery Standard electrocardiographic criteria for ischemia |
| Pulmonary limitations Peak exercise respiratory rate > 50 per minute Ventilatory reserve (peak Ve /Mvv) < 15% Oxygen desaturation by pulse oximetry Abnormal results on pretest screening spirometry Abnormal exercise flow-volume loops |
| Muscular disease Submaximal cardiac and respiratory responses Ventilatory (anaerobic) threshold < 40% of peak Vo2 Elevated lactate at any given level of submaximal work |