title: Is the Acute and Short-Term Effect of Whole-Body Vibration the Same on the H-Reflex Recruitment Curve and Agility?
abstract: BACKGROUND
  Despite the widespread use of whole-body vibration (WBV), especially in recent years, its neurophysiological mechanism is still unclear and it is yet to be determined whether acute and short-term WBV exposure produce neurogenic enhancement for agility.
  
  
  OBJECTIVE
  To compare the acute and short-term effects of WBV on the H-reflex-recruitment curve and agility.
  
  
  METHODS
  Cross-over study.
  
  
  METHODS
  Clinical electrophysiology laboratory.
  
  
  METHODS
  20 nonathlete male volunteers (mean age 24.85 ± 3.03 y).
  
  
  METHODS
  Subjects were randomly divided into 2 groups, H-reflex and agility. In the sham protocol, subjects stood on the turned-off vibration plate while maintaining the semisquat position, and then, after a 2-wk washout, vibration-training sessions were performed in the same position with a frequency of 30 Hz and an amplitude of 3 mm. H-reflex-recruitment curve was recorded and the agility test of a shuttle run was performed before and after the first session and also 48 h after the 11th session in both sham and vibration-training protocols.
  
  
  RESULTS
  Acute effects of WBV training caused a significant decrease of threshold amplitude and H-max/M-max (P = .01 and P = .04, respectively). Short-term WBV training significantly decreased the threshold intensity of the soleus H-reflex-recruitment curve (P = .01) and caused a decrease and increase respectively, in the threshold intensity and the area under the recruitment curve.
  
  
  CONCLUSIONS
  The results suggest an inhibitory effect of acute WBV training on the H-reflex response.
authors.forename: Morteza
authors.initials: M
authors.lastname: Ahmadi
authors.forename: Giti
authors.initials: G
authors.lastname: Torkaman
authors.forename: Sedigheh
authors.initials: S
authors.lastname: Kahrizi
authors.forename: Mojdeh
authors.initials: M
authors.lastname: Ghabaee
authors.forename: Leila Dadashi
authors.initials: LD
authors.lastname: Arani
mesh_terms: D000328:Adult; D018592:Cross-Over Studies; D006181:H-Reflex / Q000502:physiology*; D006801:Humans; D008297:Male; D012420:Running / Q000502:physiology*; D014732:Vibration
keywords: exercise; motoneuron excitability; shuttle-run test; soleus