Stochastic resonance whole body vibration increases perceived muscle relaxation but not cardiovascular activation: A randomized controlled trial
AIM To investigate the acute effects of stochastic resonance whole body vibration (SR WBV) including muscle relaxation and cardiovascular activation. METHODS Sixty four healthy students participated. The participants were randomly assigned to sham SR WBV training at a low intensity (1.5 Hz) or a verum SR WBV training at a higher intensity (5 Hz) Systolic blood pressure (SBP) diastolic blood pressure (DBP) heart rate (HR) and self reported muscle relaxation were assessed before and immediately after SR WBV. RESULTS Two factorial analyses of variance (ANOVA) showed a significant interaction between pre vs post SR WBV measurements and SR WBV conditions for muscle relaxation in the neck and back [F(1,55) 3.35, P 0.048, e2 0.07] Muscle relaxation in the neck and back increased in verum SR WBV, but not in sham SR WBV. No significant changes between pre and post training levels of SBD, DBD and HR were observed either in sham or verum SR WBV conditions. With verum SR WBV, improved muscle relaxation was the most significant in participants who reported the experience of back, neck or shoulder pain more than once a month (P 0.05) CONCLUSION A single session of SR WBV increased muscle relaxation in young healthy individuals, while cardiovascular load was low. An increase in musculoskeletal relaxation in the neck and back is a potential mediator of pain reduction in preventive worksite SR WBV trials.
World journal of orthopedics