title: Cardiac autonomic response during recovery from a maximal exercise using whole body vibration.
abstract: OBJECTIVE
  To examine the effect of passive whole-body vibration (WBV) on heart rate (HR) variability (HRV) during the recovery from intense exercise.
  
  
  METHODS
  Randomized, counterbalanced, crossover design
  
  
  METHODS
  Laboratory.
  
  
  METHODS
  Twenty-three healthy male performed a bicycle exercise test to exhaustion followed by an active recovery period using WBV (25Hz and peak to peak displacement of 4mm) or passive recovery period (noWBV; 0Hz-0mm) on two separate days in random order. The recovery protocol consisted of six 1-min sets separated by 1-min inter-set rest periods in the seated position with the feet on the vibration platform. ECG recordings were made at baseline and during recovery at min 2, 4, 6, 8, 10 and 12 in both conditions. Frequency-domain measures of HRV were determined via power spectral analysis using fast-Fourier transform. Low frequency (LF; 0.04-0.15Hz) and high frequency bandwidths (HF; 0.15-0.4Hz) were determined.
  
  
  RESULTS
  HR was increased in both groups (P<0.01) throughout the recovery. At min 2, HR was lower (P=0.05) after WVB compared to the noWBV trial. At min 3, the increase (P<0.05) in total power after WBV was significantly different (P<0.01) compared to noWBV. Normalized (nu) LF and LF/HF were increased (P<0.01), whereas HF nu was reduced (P<0.001) in both conditions without a significant group-by-time interaction (P=0.08).
  
  
  CONCLUSIONS
  Passive WBV reduces HR and increases total power during the early recovery of intense exercise, despite no effect on power spectral components of HRV.
authors.affiliation: Department of Physical Education and Sport, University of Seville, Spain. bsancor@us.es
authors.forename: B
authors.initials: B
authors.lastname: Sañudo
authors.forename: M
authors.initials: M
authors.lastname: César-Castillo
authors.forename: S
authors.initials: S
authors.lastname: Tejero
authors.forename: N
authors.initials: N
authors.lastname: Nunes
authors.forename: M
authors.initials: M
authors.lastname: de Hoyo
authors.forename: A
authors.initials: A
authors.lastname: Figueroa
mesh_terms: D000293:Adolescent; D000328:Adult; D000704:Analysis of Variance; D001341:Autonomic Nervous System / Q000502:physiology*; D000529:Complementary Therapies / Q000379:methods*; D018592:Cross-Over Studies; D015444:Exercise / Q000502:physiology; D005080:Exercise Test; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D008297:Male; D018709:Statistics, Nonparametric; D014732:Vibration / Q000627:therapeutic use*
keywords: Autonomic function; Exercise test to exhaustion; Heart rate variability; Low-frequency vibration; Recovery