Vibration Exposure and Biodynamic Responses during Whole-Body Vibration Training

• Autores: Andrew F.J. Abercromby, William E. Amonette, Charles S. Layne
• Localización: Medicine & Science in Sports & exercise: Official Journal of the American College of Sports Medicine, ISSN 0195-9131, Vol. 39, Nº. 10, 2007, págs. 1794-1800
• Idioma: inglés
• Texto completo no disponible (Saber más ...)
• Dialnet Métricas: 5 Citas
• Resumen

  • Purpose: Excessive, chronic whole-body vibration (WBV) has a number of negative side effects on the human body, including disorders of the skeletal, digestive, reproductive, visual, and vestibular systems. Whole-body vibration training (WBVT) is intentional exposure to WBV to increase leg muscle strength, bone mineral density, health-related quality of life, and decrease back pain. The purpose of this study was to quantitatively evaluate vibration exposure and biodynamic responses during typical WBVT regimens.

    Methods: Healthy men and women (N = 16) were recruited to perform slow, unloaded squats during WBVT (30 Hz; 4 mm p-p), during which knee flexion angle (KA), mechanical impedance, head acceleration (Harms), and estimated vibration dose value (eVDV) were measured. WBVT was repeated using two forms of vibration: 1) vertical forces to both feet simultaneously (VV), and 2) upward forces to only one foot at a time (RV).

    Results: Mechanical impedance varied inversely with KA during RV (effect size, ?p2: 0.668, P < 0.01) and VV (?p2: 0.533, P < 0.05). Harms varied with KA (?p2: 0.686, P < 0.01) and is greater during VV than during RV at all KA (P < 0.01). The effect of KA on Harms is different for RV and VV (?p2: 0.567, P < 0.05). The eVDV associated with typical RV and VV training regimens (30 Hz, 4 mm p-p, 10 min·d-1) exceeds the recommended daily vibration exposure as defined by ISO 2631-1 (P < 0.01).

    Conclusions: ISO standards indicate that 10 min·d-1 WBVT is potentially harmful to the human body; the risk of adverse health effects may be lower during RV than VV and at half-squats rather than full-squats or upright stance. More research is needed toexplore the long-term health hazards of WBVT.