Biofeedback and Self-regulation

, Volume 6, Issue 3, pp 343–353 | Cite as

The effect of biofeedback-assisted relaxation training on blood pressure and selected biochemical parameters in patients with essential hypertension

  • Angele V. McGrady
  • Robert Yonker
  • S. Y. Tan
  • Thomas H. Fine
  • Marilynn Woerner


The effect of EMG biofeedback-assisted relaxation on blood pressure and selected biochemical parameters was evaluated in 38 patients with essential hypertension. Training consisted of 8 weeks of biofeedback and home practice of relaxation exercises. Mean blood pressure decreased in the experimental group from 144/90 to 133/84 mm Hg while the control group remained unchanged. Statistically significant decreases in the experimental group also occurred in muscle tension levels, in plasma aldosterone, and in urinary cortisol. Both aldosterone and cortisol are secreted by the adrenal cortex. It was concluded that the technique taught to the experimental group produced a reduction in skeletal muscle tension and a decrease in stress responding mediated by the adrenal cortex.


Blood Pressure Hypertension Skeletal Muscle Cortisol Aldosterone 
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Copyright information

© Plenum Publishing Corporation 1981

Authors and Affiliations

  • Angele V. McGrady
    • 1
  • Robert Yonker
    • 2
  • S. Y. Tan
    • 3
  • Thomas H. Fine
    • 1
  • Marilynn Woerner
    • 1
  1. 1.Department of PhysiologyMedical College of OhioToledo
  2. 2.Bowling Green State UniversityUSA
  3. 3.Kaiser Foundation HospitalHawaii

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