title: The relationship between the heart rate deflection point test and maximal lactate steady state.
abstract: BACKGROUND
  The aim of this study was to investigate the use of the Heart Rate Deflection Point Test (HRDP) in the determination of the velocity at the Maximal Lactate Steady State (MLSS).
  
  
  METHODS
  Fifteen untrained male participants took part in a 3000-m running performance on a 400-m track. The volunteers performed an incremental test for HRDP determination. The third test was constant velocity, which lasted around 30 minutes and was based around HRDP for MLSS determination.
  
  
  RESULTS
  Performance velocity at HRDP was strongly correlated with the MLSS running velocity (r=0.84; R2=0.71; P<0.0001). HRDP running velocity (mean±SD 9.0±1.3-km.h-1) was not significantly different (P>0.05) from MLSS velocity (9.3±1.3km.h-1). A high agreement was observed between methods (Bland and Altman analysis) with a mean error of 0.47 km.h-1.
  
  
  CONCLUSIONS
  We can conclude that the HRDP was able to predict MLSS velocity.
authors.affiliation: Group of Studies and Research in Exercise Physiology, Federal University of São Paulo, Santos, São Paulo, Brazil - pereira.pauloeduardo@hotmail.co.
authors.forename: Paulo E
authors.initials: PE
authors.lastname: DE Assis Pereira
authors.forename: Vitor K
authors.initials: VK
authors.lastname: Piubelli Carrara
authors.forename: Gustavo
authors.initials: G
authors.lastname: Mello Rissato
authors.forename: João M
authors.initials: JM
authors.lastname: Pereira Duarte
authors.forename: Ricardo L
authors.initials: RL
authors.lastname: Fernandes Guerra
authors.forename: Paulo H
authors.initials: PH
authors.lastname: Silva Marques DE Azevedo
mesh_terms: D000328:Adult; D015308:Anaerobic Threshold / Q000502:physiology; D005080:Exercise Test / Q000379:methods*; D064368:Healthy Volunteers; D006339:Heart Rate / Q000502:physiology*; D000070276:Heart Rate Determination; D006801:Humans; D019344:Lactic Acid / Q000097:blood*; D008297:Male; D011237:Predictive Value of Tests; D012420:Running / Q000502:physiology*
chemical_list: D019344:Lactic Acid