title: Sensitivity of the Yo-Yo Intermittent Recovery Test and cardiac autonomic responses to training in futsal players.
abstract: OBJECTIVE
  This study examined the sensitivity of maximal (Yo-Yo Intermittent Recovery [IR] 1 and 2) and submaximal (5'-5') tests to identify training adaptations in futsal players along with the suitability of heart-rate (HR) and HR-variability (HRV) measures to identify these adaptations.
  
  
  METHODS
  Eleven male professional futsal players were assessed before (pretraining) and after (posttraining) a 5-wk period. Assessments included 5'-5' and Yo-Yo IR1 and IR2 performances and HR and HRV at rest and during the IR and 5'-5' tests. Magnitude-based-inference analyses examined the differences between pre- and posttraining, while relationships between changes in variables were determined via correlation.
  
  
  RESULTS
  Posttraining, Yo-Yo IR1 performance likely increased while Yo-Yo IR2 performance almost certainly increased. Submaximal HR during the Yo-Yo IR1 and Yo-Yo IR2 almost certainly and likely, respectively, decreased with training. HR during the 5'-5' was very likely decreased, while HRV at rest and during the 5'-5' was likely increased after training. Changes in both Yo-Yo IR performances were negatively correlated with changes in HR during the Yo-Yo IR1 test and positively correlated with the change in HRV during the 5'-5'.
  
  
  CONCLUSIONS
  The current study has identified the Yo-Yo IR2 as more responsive for monitoring training-induced changes of futsal players than the Yo-Yo IR1. Changes in submaximal HR during the Yo-Yo IR and HRV during the 5'-5' were highly sensitive to changes in maximal performance and are recommended for monitoring training. The 5'-5' was recommended as a time-efficient method to assess training adaptations for futsal players.
authors.affiliation: Center of Physical Education and Sport, State University of Londrina, Londrina, Brazil.
authors.forename: Victor H
authors.initials: VH
authors.lastname: de Freitas
authors.forename: Lucas A
authors.initials: LA
authors.lastname: Pereira
authors.forename: Eberton A
authors.initials: EA
authors.lastname: de Souza
authors.forename: Anthony S
authors.initials: AS
authors.lastname: Leicht
authors.forename: Maurizio
authors.initials: M
authors.lastname: Bertollo
authors.forename: Fábio Y
authors.initials: FY
authors.lastname: Nakamura
mesh_terms: D000328:Adult; D056352:Athletes; D001341:Autonomic Nervous System / Q000502:physiology; D015444:Exercise / Q000502:physiology; D006339:Heart Rate / Q000502:physiology; D006801:Humans; D008297:Male; D012420:Running / Q000502:physiology; D013177:Sports / Q000502:physiology*; D055815:Young Adult