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The Journal of Sports Medicine and Physical Fitness 1999 June;39(2):93-100

Copyright © 1999 EDIZIONI MINERVA MEDICA

lingua: Inglese

Transcutaneous carbon dioxide threshold during exercise

Abraham P., Carter D., Bickert S., Desvaux B., Saumet J. L.

Laboratoire de Physiologie et d’Exploration Fonctionnelle, Centre Hospitalier Universitaire, Angers, France


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Background. To ­study the pos­sible use of trans­cu­ta­ne­ous car­bon diox­ide pres­sure meas­ure­ments to esti­mate ven­til­a­to­ry thresh­old dur­ing exer­cise.
Methods. Experimental ­design: comparative ­study. Settings: Institutional prac­tice, ambu­la­to­ry ­care. Patients and meas­ures: seventy-nine sub­jects. Intervention: incremental exer­cise ­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 oxy­gen con­sump­tion rela­tion­ship: V ­slope tech­nique (VTa), and the ven­til­a­to­ry equiv­a­lent for oxy­gen ­uptake chang­es ­over ­time: (VTb), the res­pir­a­to­ry com­pen­sa­tion ­point (RCP) on ven­til­a­to­ry equiv­a­lent for car­bon diox­ide, and the trans­cu­ta­ne­ous thresh­old (Ttc) on the trans­cu­ta­ne­ous car­bon diox­ide pres­sure chang­es ­over ­time respec­tive­ly.
Results. A Ttc ­could be ­defined by all observ­ers in 85% of the sub­jects. Correlation ­between Ttc and VT ­expressed as oxy­gen con­sump­tion abso­lute val­ues ­ranged ­from 0.971 to 0.975 on the ­mean val­ues of six observ­ers. Using the Bland-Altmann ­approach, dif­fer­enc­es (­mean±SD) ­were 13±215, -40±204, 231±221 ml·min-1 ­between Ttc and VTa, VTb, RCP respec­tive­ly. A dif­fer­ence of 38±173 ml·min-1 was ­found ­between VTa and VTb. This sug­gests ­that Ttc ­shows lit­tle dif­fer­ence ­with VT but not ­with RCP.
Conclusions. We sug­gest ­that a car­bon diox­ide trans­cu­ta­ne­ous thresh­old can be ­found ­close to the ven­til­a­to­ry thresh­old. Potential clin­i­cal use of trans­cu­ta­ne­ous ­device are ­vast.

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