title: Selective Effects of Training Against Weight and Inertia on Muscle Mechanical Properties.
abstract: OBJECTIVE
  To explore the effects of training against mechanically different types of loads on muscle force (F), velocity (V), and power (P) outputs.
  
  
  METHODS
  Subjects practiced maximum bench throws over 8 wk against a bar predominantly loaded by approximately constant external force (weight), weight plates (weight plus inertia), or weight plates whose weight was compensated by a constant external force pulling upward (inertia). Instead of a typically applied single trial performed against a selected load, the pretest and posttest consisted of the same task performed against 8 different loads ranging from 30% to 79% of the subject's maximum strength applied by adding weight plates to the bar. That provided a range of F and V data for subsequent modeling by linear F-V regression revealing the maximum F (F-intercept), V (V-intercept), and P (P = FV/4).
  
  
  RESULTS
  Although all 3 training conditions resulted in increased P, the inertia type of the training load could be somewhat more effective than weight. An even more important finding was that the P increase could be almost exclusively based on a gain in F, V, or both when weight, inertia, or weight-plus-inertia training load were applied, respectively.
  
  
  CONCLUSIONS
  The inertia training load is more effective than weight in increasing P and weight and inertia may be applied for selective gains in F and V, respectively, whereas the linear F-V model obtained from loaded trials could be used for discerning among muscle F, V, and P.
authors.forename: Sasa
authors.initials: S
authors.lastname: Djuric
authors.forename: Ivan
authors.initials: I
authors.lastname: Cuk
authors.forename: Sreten
authors.initials: S
authors.lastname: Sreckovic
authors.forename: Dragan
authors.initials: D
authors.lastname: Mirkov
authors.forename: Aleksandar
authors.initials: A
authors.lastname: Nedeljkovic
authors.forename: Slobodan
authors.initials: S
authors.lastname: Jaric
mesh_terms: D001696:Biomechanical Phenomena; D006801:Humans; D008297:Male; D053580:Muscle Strength / Q000502:physiology; D018482:Muscle, Skeletal / Q000502:physiology*; D055070:Resistance Training / Q000379:methods*; D014891:Weight Lifting / Q000502:physiology*; D055815:Young Adult
keywords: biomechanics; exercise performance; muscle function; resistance training; strength