title: Validity of critical frequency test for measuring table tennis aerobic endurance through specific protocol.
abstract: The aim of this study was to validate critical frequency specific test (critf) for the estimation of the aerobic endurance in table tennis players.
  
  
  METHODS
  Eight male international-level table tennis players participated of this study. Specific tests were applied by using a mechanical ball thrower to control the intensity of the exercise. The critf was determined by applying three or four series of exercises to exhaustion (Tlim). The critf was evaluated by using lactate steady state test (90, 100, and 106 % of critf intensity). The other specific test was an incremental protocol used to determine the anaerobic threshold (AnTBI) and the onset of blood lactate accumulation (OBLA) using a ball thrower.
  
  
  RESULTS
  The critf (39.87 ± 3.31 balls·min(-1)) was not significantly different among AnTBI (48.11 ± 7.36 balls·min(- 1)) and OBLA3.5 (49.36 ± 12.04 balls·min(-1)) frequencies and it was correlated with AnTBI parameter (r = 0.78). At frequencies of the 90 and 100% of critf a dynamic equilibrium was verified in lactate concentration between the eighth and twentieth minutes. However, this dynamic equilibrium was not found at 106% intensity.
  
  
  CONCLUSIONS
  The data indicate that in table tennis the critf model can be used for measuring the aerobic endurance. Key pointsIn table tennis is need the use of a specific protocol for evaluation of the aerobic endurance.The critical frequency test in table tennis seems to represent the intensity of maximal equilibrium of lactatemia.The critical frequency test can be used for measuring table tennis aerobic endurance through specific protocol.
authors.affiliation: Laboratory of Sport Applied Physiology, Sao Paulo State University-UNESP , Rio Claro, Brazil ; Laboratory of Research in Exercise Physiology (LAPEFE), Federal University of Mato Grosso do Sul (UFMS) , Campo Grande-MS, Brazil.
authors.forename: Alessandro M
authors.initials: AM
authors.lastname: Zagatto
authors.forename: Marcelo
authors.initials: M
authors.lastname: Papoti
authors.forename: Claudio A
authors.initials: CA
authors.lastname: Gobatto
keywords: Aerobic endurance; Anaerobic threshold; Blood lactate; table tennis