title: Using Bar Velocity to Predict the Maximum Dynamic Strength in the Half-Squat Exercise.
abstract: OBJECTIVE
  To determine whether athletes from different sport disciplines present similar mean propulsive velocity (MPV) in the half-squat (HS) during submaximal and maximal tests, enabling prediction of 1-repetition maximum (1-RM) from MPV at any given submaximal load.
  
  
  METHODS
  Sixty-four male athletes, comprising American football, rugby, and soccer players; sprinters and jumpers; and combat-sport strikers attended 2 testing sessions separated by 2-4 wk. On the first visit, a standardized 1-RM test was performed. On the second, athletes performed HSs on Smith-machine equipment, using relative percentages of 1-RM to determine the respective MPV of submaximal and maximal loads. Linear regression established the relationship between MPV and percentage of 1-RM.
  
  
  RESULTS
  A very strong linear relationship (R2 ≈ .96) was observed between the MPV and the percentages of HS 1-RM, resulting in the following equation: %HS 1-RM = -105.05 × MPV + 131.75. The MPV at HS 1-RM was ~0.3 m/s.
  
  
  CONCLUSIONS
  This equation can be used to predict HS 1-RM on a Smith machine with a high degree of accuracy.
authors.affiliation: NAR - Nucleus of High Performance in Sport, São Paulo, Brazil.
authors.forename: Irineu
authors.initials: I
authors.lastname: Loturco
authors.forename: Lucas A
authors.initials: LA
authors.lastname: Pereira
authors.forename: Cesar C
authors.initials: CC
authors.lastname: Cal Abad
authors.forename: Saulo
authors.initials: S
authors.lastname: Gil
authors.forename: Katia
authors.initials: K
authors.lastname: Kitamura
authors.forename: Ronaldo
authors.initials: R
authors.lastname: Kobal
authors.forename: Fábio Y
authors.initials: FY
authors.lastname: Nakamura
mesh_terms: D056352:Athletes; D006801:Humans; D016014:Linear Models; D008297:Male; D053580:Muscle Strength / Q000502:physiology*; D055070:Resistance Training; D055815:Young Adult