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O2 & CO2 and anaeorbic threshold

What biochemical rationale exists for measuring oxygen consumption, ventilation and carbon dioxide production to infer onset of anaerobic threshold during exerise?

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The paptienmt should be connecte dto a spirometer whilst exercising on an exercise bike or ergometer. The spirometer enables the physician to measure tidal volume (TV), inspiratory reserve volume (IRV), expiratory reserve volume (ERV), vital capacity (VC), residual volume (RV), total lung capacity (TLC) and respiratory rate. As activity levels increase the amount of oxygen that is transferred from the air in the ...