title: Do physical fitness measures influence internal training load responses in high-level futsal players?
abstract: BACKGROUND
  The aim of the present study was to verify whether aerobic fitness and ability to perform repeated high-intensity efforts influence the internal training load (ITL), which consists of the actual stress imposed in the athletes' organisms, in professional futsal players.
  
  
  METHODS
  Twelve high-level futsal players (age: 26.3±4.9 years, body mass: 73.5±7.5 kg) participated in the study. The investigated athletes took part in a 5-week pre-season period. The ITL was quantified by means of the session-Rating of Perceived Exertion method. The athletes performed the Yo-yo Intermittent Recovery Test level 2 (YYIR2) in order to assess the ability to perform repeated high-intensity actions, and the multistage shuttle-run test (MSRT) in order to evaluate aerobic fitness, before (T0) and after (T1) the pre-season period. Maximal oxygen uptake (VO2max.), oxygen uptake at Respiratory compensation point (VO2-RCP) and maximal aerobic speed (MAS) obtained in MSRT were retained for analyses.
  
  
  RESULTS
  The results from Pearson's correlation test showed significant and a very large correlation between ITL and YYIR2 performance (r=-0.75). Moreover, a significant and large correlation between ITL and VO2max. (r=-0.62), ITL and MAS (r=-0.67), and ITL and VO2-RCP (r=-0.58) were also observed.
  
  
  CONCLUSIONS
  It can be concluded that aerobic fitness and ability to perform repeated high-intensity actions may influence ITL responses in professional futsal players.
authors.affiliation: Grupo de estudos e pesquisa em planejamento e monitoramento do treinamento físico e esportivo Escola de Educação Física e Esporte Departamento de Esporte Universidade de São Paulo, SP, Brasil - bernardomiloski@yahoo.com.br.
authors.forename: B
authors.initials: B
authors.lastname: Miloski
authors.forename: A
authors.initials: A
authors.lastname: Moreira
authors.forename: F C
authors.initials: FC
authors.lastname: Andrade
authors.forename: V H
authors.initials: VH
authors.lastname: Freitas
authors.forename: T
authors.initials: T
authors.lastname: Peçanha
authors.forename: R A
authors.initials: RA
authors.lastname: Nogueira
authors.forename: M
authors.initials: M
authors.lastname: Bara-Filho
mesh_terms: D000328:Adult; D006801:Humans; D008297:Male; D010101:Oxygen Consumption / Q000502:physiology; D010806:Physical Education and Training; D010809:Physical Fitness / Q000502:physiology*; D055070:Resistance Training; D012119:Respiration; D012916:Soccer / Q000502:physiology*; D055815:Young Adult