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Relationship Between Lower Limb Muscle Activity and Platform Acceleration During Whole-Body Vibration Exercise
Karin Lienhard1, Jordyn Vienneau, Sandro Nigg
11CNRS, I3S, UMR 7271, University of Nice Sophia Antipolis, Nice, France; 2LAMHESS, EA 6312, University of Nice Sophia Antipolis, Nice, France; and 3Human Performance Laboratory, Faculty of Kinesiology, University of Calgary, Calgary, Alberta, Canada.
Journal of Strength and Conditioning Research
|March 13, 2015
Summary
Whole-body vibration (WBV) exercises significantly increase muscle activity, especially with higher vertical accelerations. For optimal results in WBV training, platforms should provide at least 18 m·s(-2) vertical acceleration.
Area of Science:
- Biomechanics
- Exercise Physiology
- Human Movement Science
Background:
- Whole-body vibration (WBV) is increasingly used in fitness and rehabilitation.
- Understanding the impact of vibration parameters on muscle activation is crucial for optimizing WBV training.
- Surface electromyography (sEMG) is a key tool for measuring muscle response to mechanical stimuli.
Purpose of the Study:
- To investigate how different vibration magnitudes and directions influence sEMG during WBV exercises.
- To determine the relationship between platform acceleration and muscle activity in lower limb muscles.
Main Methods:
- Thirty individuals performed static squats on a WBV platform with various modes (side-alternating, circular, dual-mode) and frequencies/amplitudes.
- 3D platform acceleration was measured, and sEMG signals from lower limb muscles were recorded.
- Control trials without vibration were included for comparison.
Main Results:
- Most muscles showed significant sEMG increases with specific dual-mode vibrations (Side-L/Circ-H, Side-H/Circ-L, Side-H/Circ-H) and Side-H mode for lower leg muscles.
- Only vertical platform acceleration demonstrated a strong linear relationship (r=0.970) with averaged lower limb sEMG.
- Significant sEMG increases were observed at vertical acceleration thresholds of 18 m·s(-2) and higher.
Conclusions:
- WBV exercise effectiveness is significantly influenced by vibration direction and magnitude.
- Vertical acceleration is the primary driver of increased muscle activity during WBV.
- WBV platforms should deliver vertical accelerations of 18 m·s(-2) or greater for enhanced muscle engagement.
