The purpose of this study was to determine if the head accelerations using a common whole body vibration (WBV) exercise protocol acutely reduced neurocognition in healthy subjects. Second, we investigated differential responses to WBV plates with two different delivery mechanisms: vertical and rotational vibration. Twelve healthy subjects (N=12) volunteered and completed a baseline (BASE) neurocognitive assessment: the Immediate Post-Concussion Assessment and Cognitive Test (ImPACT). Subjects then participated in three randomized exercise sessions separated by no more than 2-weeks. The exercise sessions consisted of five 2-minute sets of static hip-width stance squats, with the knees positioned at 45[degrees] of flexion. The squats were performed with no vibration (CON), a vertically vibrating plate (VV), and a rotational vibrating plate (RV) set to 30Hz with 4mm of peak-to-peak displacement. ImPACT assessments were completed immediately following each exercise session and the composite score for 5 cognitive domains were analyzed: verbal memory, visual memory, visual motor speed, reaction time, and impulse control. Verbal memory scores were unaffected by exercise with or without vibration (p=0.40). Likewise, visual memory was not different (p=0.14) following CON, VV, or RV. Significant differences were detected for visual motor speed (p=0.006); VV was elevated compared to BASE (p=0.01). There were no significant differences (p=0.26) in reaction time or impulse control (p=0.16) following exercise with or without vibration. In healthy individuals, ten minutes of 30Hz, 4mm peak-to-peak displacement vibration exposure with 45o of knee flexion did not negatively affect neurocognition.
Copyright (C) 2014 by the National Strength & Conditioning Association.