title: Reliability of peak O2 uptake and O2 uptake kinetics in step exercise tests in healthy subjects.
abstract: To date little is known about the reliability of peak oxygen consumption (V˙O2PEAK) in incremental metronome paced step tests (IST) and the reliability of on-kinetics V˙O2 has never been studied. We aimed to study the reliability of both tests. Eleven healthy subjects performed two ISTs until exhaustion. On two different days two duplicate 4min constant metronome paced step tests (CST) were performed. V˙O2PEAK, mean response time (MRT) and phase II time constant (τ) were tested for reproducibility using the paired t-tests, in addition to the limits of agreement (LOA) and within subject coefficient of variation (COV). With a 95% LOA of 0.38 to 0.26Lmin(-1), -8.7 to 9.1s and -9.9 to 10.5s they exhibit a COV of 3%, 4.5% and 6.9% for V˙O2PEAK, MRT and τ respectively. ST are sufficiently reliable for maximal and submaximal aerobic power assessments in healthy subjects and new studies of oxygen uptake kinetics in selected patient groups are warranted.
authors.affiliation: Laboratory of Respiratory Pathophysiology (LAFIR), Federal University of Mato Grosso do Sul (UFMS), Rua Filinto Müller S/N, Vila Ipiranga, CEP:79080-090, Campo Grande, Mato Grosso do Sul, Brazil. Electronic address: paulo.muller@ufms.br.
authors.forename: Paulo de Tarso
authors.initials: Pde T
authors.lastname: Müller
authors.affiliation: Laboratory of Respiratory Pathophysiology (LAFIR), Federal University of Mato Grosso do Sul (UFMS), Rua Filinto Müller S/N, Vila Ipiranga, CEP:79080-090, Campo Grande, Mato Grosso do Sul, Brazil. Electronic address: g.christofoletti@ufms.br.
authors.forename: Gustavo
authors.initials: G
authors.lastname: Christofoletti
authors.affiliation: Faculty of Sciences, Physical Education Department,UNESP-Univ Estadual Paulista, Rua Edmundo Carrijo Coube 14-01-Vargem Limpa, 17.033-360, Bauru, São Paulo, Brazil. Electronic address: azagatto@fc.unesp.br.
authors.forename: Alessandro Moura
authors.initials: AM
authors.lastname: Zagatto
authors.affiliation: Laboratory of Respiratory Pathophysiology (LAFIR), Federal University of Mato Grosso do Sul (UFMS), Rua Filinto Müller S/N, Vila Ipiranga, CEP:79080-090, Campo Grande, Mato Grosso do Sul, Brazil. Electronic address: didivipa@hotmail.com.
authors.forename: Fernanda Viana
authors.initials: FV
authors.lastname: Paulin
authors.affiliation: Division of Respiratory and Critical Care Medicine, Department of Medicine, Queen's University and Kingston General Hospital. Richardson House, 102 Stuart Street, Kingston, ON, Canada, K7L 2V6. Electronic address: nederalb@gmail.com.
authors.forename: J Alberto
authors.initials: JA
authors.lastname: Neder
mesh_terms: D000328:Adult; D015444:Exercise / Q000502:physiology*; D005080:Exercise Test; D005260:Female; D064368:Healthy Volunteers; D006801:Humans; D008297:Male; D008875:Middle Aged; D010101:Oxygen Consumption / Q000502:physiology*; D005082:Physical Exertion / Q000502:physiology*; D015203:Reproducibility of Results; D013997:Time Factors; D055815:Young Adult
keywords: Aerobic; Exercise; Kinetics; Oxygen consumption; Reliability; Step tests