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Cardiovascular systemic regulation by plantar surface stimulation.

Guruprasad Madhavan1, Julian M Stewart, Kenneth J McLeod

  • 1Department of Orthopaedics, School of Medicine, Health Sciences Center, State University of New York, Stony Brook, USA. guru@binghamton.edu

Biomedical Instrumentation & Technology
|March 21, 2006
PubMed
Summary

Low-level plantar vibration effectively counteracts blood pressure drops during orthostatic stress. This noninvasive method, particularly at 30-60 Hz, shows promise for managing cardiovascular responses to prolonged sitting.

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Area of Science:

  • Cardiovascular Physiology
  • Biomedical Engineering
  • Orthostatic Intolerance Research

Background:

  • Orthostatic stress, characterized by decreased blood pressure and flow rates, is linked to various clinical conditions.
  • Understanding and mitigating these cardiovascular responses is crucial for maintaining health, especially during prolonged sedentary periods.

Purpose of the Study:

  • To investigate the efficacy of low-magnitude vibration applied to the plantar surface in inhibiting cardiovascular responses to orthostatic stress.
  • To determine the optimal frequency range for plantar vibration to counteract orthostatic hypotension.

Main Methods:

  • Thirty healthy women (aged 22-82) were exposed to plantar vibration at various frequencies (0-120 Hz, 0.2g) immediately after sitting.
  • Cardiovascular responses, including blood pressure and heart rate variability (HRV), were monitored for 20 minutes.

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  • Mean arterial pressure (MAP) and HRV were calculated from pre- and post-stimulus measurements.

    • Main Results:

    • Quiet sitting induced an average MAP drop of 5.15 mm Hg, which was significantly reduced by plantar vibration in a frequency-dependent manner.
    • Plantar stimulation at 44 Hz nearly completely suppressed the MAP drop.
    • In orthostatically hypotensive individuals, plantar vibrations in the 40-60 Hz range eliminated MAP drops and HRV decline.

    Conclusions:

    • Noninvasive, low-level plantar vibration (30-60 Hz) significantly inhibits cardiovascular effects of orthostatic stress from quiet sitting.
    • The findings suggest plantar vibration may activate leg muscle fibers, aiding circulation during inactivity.
    • This vibration therapy presents a potential non-pharmacological intervention for managing orthostatic intolerance.