title: Does whole-body vibration acutely improve power performance via increased short latency stretch reflex response?
abstract: OBJECTIVE
  It remains unclear whether an increased intrafusal mechanical sensitivity is related to the vibration-induced performance improvement. This investigation aimed to determine the residual acute effect of whole-body vibration and its duration on pre-activation levels, short-latency stretch reflex and performance during drop jumps.
  
  
  METHODS
  Repeated measures.
  
  
  METHODS
  Eleven amateur athletes performed a set of three 45cm-drop jumps before and during a 20min-interval following three randomized conditions: No, Low (30Hz, 5mm) and High vibration (45Hz, 5mm). Ground reaction force peak, Soleus and Vastus Lateralis short latency stretch reflex onset and amplitude were assessed during drop jumps.
  
  
  RESULTS
  A significant effect for time revealed an immediate drop jump height increase after High vibration. A longer contact time also followed High vibration while no changes were detected after Low vibration. Vibration did not affect ground reaction force peak and short latency stretch reflex component.
  
  
  CONCLUSIONS
  High vibration constituted an intervention for improving performance although there was no evidence of increased stretch reflex responses.
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; D054874:Athletic Performance / Q000502:physiology*; D004576:Electromyography; D064368:Healthy Volunteers; D006801:Humans; D011930:Reaction Time / Q000502:physiology*; D012026:Reflex, Stretch / Q000502:physiology*; D014732:Vibration; D055815:Young Adult