Transcutaneous carbon dioxide threshold during exercise

摘要

Background. To study the possible use of transcutaneous car- bon dioxide pressure measurements to estimate ventilatory threshold during exercise. Methods. Experimental design: comparative study. Settings: Instituional practice, ambulatory care. Patients and meas- Ures: seventy-nine subjects. Intervention: incremental exer- Cise tests with simultaneous recordings of breath by breath gas Exchange and transcutaneous carbon dioxide pressure. Measures six reviewers determined the ventilatory threshold Using both the graphs for the carbon dioxide excretion to oxy- Gen consumption relationship: V slope technique (Vta), and the Ventilatory equivalent for oxygen uptake changes over time: (VTb), the respiratory compensation point (RCP) on ventila- tory equivalent for carbon dioxide, and the transcutaneous threshold (Ttc) on the transcutaneous carbon dioxide pressure changes over time respectively.