title: Test-retest reliability of a 3-min isokinetic all-out test using two different cadences.
abstract: OBJECTIVE
  To investigate the test-retest reliability of mechanical parameters derived from a 3-min isokinetic all-out test, performed at 60 and 100 rpm. Reliability and validity of the peak oxygen uptake derived from 3-min isokinetic all-out test were also tested.
  
  
  METHODS
  14 healthy male subjects completed an incremental ramp testing and four randomized 3-min isokinetic all-out test (two at 60 rpm and two at 100 rpm).
  
  
  METHODS
  The absolute and relative reliability of the following parameters were analyzed: peak power, mean power, end power, fatigue index, work performed above end power and peak oxygen uptake.
  
  
  RESULTS
  No difference was found between each two sets of data, although there were between-cadence differences for peak power, mean power, end power, and fatigue index. Higher intra-class correlation (ICC) and lower coefficient of variation (CV) were found for end power (ICC = 0.91 and 0.95; CV = 5.6 and 5.7%) and mean power (ICC = 0.97 and 0.98; CV = 2.4 and 3.1%), than for peak power (ICC = 0.81 and 0.84; CV = 8.7 and 10%) and work performed above end power (ICC = 0.79 and 0.84; CV = 7.9 and 10.6%; values reported for 60 rpm and 100 rpm, respectively). High reliability scores were also observed for peak oxygen uptake at both cadences (60 rpm, CV = 3.2%; 100 rpm, CV = 2.3%,) with no difference with the incremental ramp testing peak oxygen uptake.
  
  
  CONCLUSIONS
  The power profile and peak oxygen uptake of a 3-min isokinetic all-out test are both highly reliable, whether the test is performed at 60 or 100 rpm. Besides, peak oxygen uptake and work performed above end power were not affected by the change in cadence while peak power, mean power, end power, and fatigue index were.
authors.affiliation: Physical Effort Laboratory, Federal University of Santa Catarina, Florianópolis, Brazil. Electronic address: ricardo@tridantas.com.br.
authors.forename: Ricardo Dantas
authors.initials: RD
authors.lastname: de Lucas
authors.affiliation: Human Performance Laboratory, São Paulo State University, Rio Claro, Brazil.
authors.forename: Camila Coelho
authors.initials: CC
authors.lastname: Greco
authors.affiliation: Chelsea School, University of Brighton, Eastbourne, United Kingdom.
authors.forename: Jeanne
authors.initials: J
authors.lastname: Dekerle
authors.affiliation: Human Performance Laboratory, São Paulo State University, Rio Claro, Brazil.
authors.forename: Renato Aparecido Corrêa
authors.initials: RA
authors.lastname: Caritá
authors.affiliation: Physical Effort Laboratory, Federal University of Santa Catarina, Florianópolis, Brazil.
authors.forename: Luiz Guilherme Antonacci
authors.initials: LG
authors.lastname: Guglielmo
authors.affiliation: Human Performance Laboratory, São Paulo State University, Rio Claro, Brazil.
authors.forename: Benedito Sérgio
authors.initials: BS
authors.lastname: Denadai
mesh_terms: D000328:Adult; D001642:Bicycling / Q000502:physiology; D001696:Biomechanical Phenomena; D015444:Exercise / Q000502:physiology*; D064368:Healthy Volunteers; D006801:Humans; D008297:Male; D010809:Physical Fitness; D015203:Reproducibility of Results; D055815:Young Adult
keywords: Cycling; End-power; Pedal rate; Power output profile