A simplified strategy for the estimation of the exercise ventilatory thresholds

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dc.contributor.authorNeder, Jose Alberto [UNIFESP]
dc.contributor.authorStein, R.
dc.contributor.institutionUniversidade Federal de São Paulo (UNIFESP)
dc.contributor.institutionUniv Fed Rio Grande Sul
dc.date.accessioned2016-01-24T12:41:08Z
dc.date.available2016-01-24T12:41:08Z
dc.date.issued2006-05-01
dc.description.abstractPurpose: To analyze the limits of agreement between exercise ventilatory threshold values (VT1 and VT2) estimated from a combination of pulmonary gas exchange and ventilatory variables (cardiopulmonary exercise testing) and those derived from an alternative approach based oil the ventilatory response only (VE. ventilometry). Methods: Forty-two nontrained subjects (24 males, aged 18-48, peak VO2 = 33.1 +/- 8.6 mL(.)min(-1.)kg(-1)) performed a maximum incremental cardiopulmonary exercise testing on all electromagnetically braked cycle ergometer. the participants breathed through a Pilot tube (Cardio(2) System (TM), MGC) and a fixed-resistance ventilometer (Micromed, Brazil), which were connected in series. HR values at the estimated VT (VTHR1 and VTHR2) were obtained by the conventional method (ventilatory equivalents. end-expiratory pressures for O-2 and CO2 and the V-slope procedure) and an experimental approach (VE vs time, VE/time vs time. and breathing frequency vs time). Results: There were no significant between-method differences on VTHR1, VTHR2, VTVE1, VTVE2, and peak VE (P > 0.05). After certification of data normality, a Bland-Altman analysis revealed that the mean bias 95% confidence interval of the between-method differences were lower for VTHR2 than VTHR1 (2 +/- 9 and 0 +/- 17 bpm, respectively). VTHR2 according to ventilometry differed more than 10 bpm from the standard procedure in 3 out of 42 subjects (9%). Between-method differences were independent of the level of fitness, as estimated from peak VO2 (P > 0.05). Conclusions: A simplified approach, based oil the ventilatory response as a function of time, call provide acceptable estimates of the exercise ventilatory thresholds-especially VT2-during ramp-incremental cycle ergometry. This new strategy might prove to be useful for exercise training prescription in nontrained adults.en
dc.description.affiliationUniversidade Federal de São Paulo, Dept Med,Paulista Sch Med, Pulm Funct & Clin Exercise Physiol Unit, Div Resp, BR-04020050 São Paulo, Brazil
dc.description.affiliationUniversidade Federal de São Paulo, Div Resp Dis, Pulm Funct & Clin Exercise Physiol Unit, BR-04020050 São Paulo, Brazil
dc.description.affiliationUniv Fed Rio Grande Sul, Hosp Clin Porto Alegre, Non Invas Cardiac Unit, Heart Div, Porto Alegre, RS, Brazil
dc.description.affiliationUnifespUniversidade Federal de São Paulo, Dept Med,Paulista Sch Med, Pulm Funct & Clin Exercise Physiol Unit, Div Resp, BR-04020050 São Paulo, Brazil
dc.description.affiliationUnifespUniversidade Federal de São Paulo, Div Resp Dis, Pulm Funct & Clin Exercise Physiol Unit, BR-04020050 São Paulo, Brazil
dc.description.sourceWeb of Science
dc.format.extent1007-1013
dc.identifierhttp://dx.doi.org/10.1249/01.mss.0000218141.90442.6c
dc.identifier.citationMedicine and Science in Sports and Exercise. Philadelphia: Lippincott Williams & Wilkins, v. 38, n. 5, p. 1007-1013, 2006.
dc.identifier.doi10.1249/01.mss.0000218141.90442.6c
dc.identifier.issn0195-9131
dc.identifier.urihttp://repositorio.unifesp.br/handle/11600/28870
dc.identifier.wosWOS:000237495500027
dc.language.isoeng
dc.publisherLippincott Williams & Wilkins
dc.relation.ispartofMedicine and Science in Sports and Exercise
dc.rightsinfo:eu-repo/semantics/openAccess
dc.subjectgas exchangeen
dc.subjectventilometeren
dc.subjectcardiopulmonary exercise testingen
dc.subjectlimits of agreementen
dc.titleA simplified strategy for the estimation of the exercise ventilatory thresholdsen
dc.typeinfo:eu-repo/semantics/article
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