Detection of ventilatory threshold by an automatic parabolic model.
This work aims at presenting a method for automatic detection of the ventilatory threshold by modeling ventilatory equivalent of oxygen by a parabolic function. Thirty healthy male subjects were submitted to a single maximal oxygen uptake test, being monitored the ventilatory gas exchange signals. Ventilatory threshold by visual inspection, automatic v-slope and parabolic function methods was compared. The automatic methods showed no significant differences with visual inspection, but the parabolic technique presented higher consistence than v-slope. Since the parabolic method have low computation cost and is a simple method, it can be recommended as an alternative choice to v-slope method.
Mello
Roger G T
RG
Biomedical Engineering Program, COPPE, Federal University of Rio de Janeiro, P. O. Box 68.510, Rio de Janeiro RJ 21941-972, Brazil. roger@peb.ufrj.br
Jesus
Igor R T
IR
Buarque
Reinaldo F
RF
Oliveira
Liliam F
LF
Nadal
Jurandir
J
D000328:Adult; D000465:Algorithms; D015308:Anaerobic Threshold / Q000502:physiology*; D003198:Computer Simulation; D003936:Diagnosis, Computer-Assisted / Q000379:methods*; D006801:Humans; D008297:Male; D008954:Models, Biological; D010101:Oxygen Consumption / Q000502:physiology*; D010363:Pattern Recognition, Automated / Q000379:methods*; D015203:Reproducibility of Results; D012129:Respiratory Function Tests / Q000379:methods*; D012680:Sensitivity and Specificity