title: Does vibration counteract the static stretch-induced deficit on muscle force development?
abstract: OBJECTIVE
  To determine the residual acute vibration-stretching effect on preactivation levels, short-latency stretch reflex, and performance during execution of drop jumps.
  
  
  METHODS
  Repeated measures.
  
  
  METHODS
  Eleven male recreational athletes performed a set of three 45cm drop jumps before and immediately after a 30s static stretching exercise with and without simultaneously imposed muscle vibration (45Hz, 5mm). Drop jump height, ground reaction forces and electromyographic data including Vastus Lateralis onset/levels of preactivation and short-latency stretch reflex were recorded.
  
  
  RESULTS
  No changes were induced on drop jump height. However, stretching-induced decrements on ground reaction force peak and time to peak as well as an increment in contact time followed a delay in short-latency stretch reflex onset and a reduced preactivation level of Vastus Lateralis. Otherwise, when vibration was simultaneously imposed, there was no evidence of changes in high-speed force production variables or electromyographic recordings.
  
  
  CONCLUSIONS
  Mechanical vibration, when applied simultaneously to static-stretching routines, appeared to be effective to counteract decreased musculotendinous unit stiffness-induced high-speed force production deficit during jumping performance.
authors.affiliation: Laboratory Crossbridges, Programa de Pós-graduação em Ciências do Exercício e do Esporte, Universidade Gama Filho, Rio de Janeiro, Brazil.
authors.forename: Igor Alexandre
authors.initials: IA
authors.lastname: Fernandes
authors.forename: Gregory
authors.initials: G
authors.lastname: Kawchuk
authors.forename: Yagesh
authors.initials: Y
authors.lastname: Bhambhani
authors.forename: Paulo Sergio Chagas
authors.initials: PS
authors.lastname: Gomes
mesh_terms: D000328:Adult; D006801:Humans; D008297:Male; D009119:Muscle Contraction; D052580:Muscle Stretching Exercises; D014732:Vibration; D055815:Young Adult