title: Detection of ventilatory threshold by an automatic parabolic model.
abstract: 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.
authors.affiliation: 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
authors.forename: Roger G T
authors.initials: RG
authors.lastname: Mello
authors.forename: Igor R T
authors.initials: IR
authors.lastname: Jesus
authors.forename: Reinaldo F
authors.initials: RF
authors.lastname: Buarque
authors.forename: Liliam F
authors.initials: LF
authors.lastname: Oliveira
authors.forename: Jurandir
authors.initials: J
authors.lastname: Nadal
mesh_terms: 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