Low-frequency electrical stimulation increases muscle strength and improves blood supply in patients with chronic heart failure

Circ J. 2006 Jan;70(1):75-82. doi: 10.1253/circj.70.75.

Abstract

Background: This study was designed to evaluate the effects of low-frequency electrical stimulation (LFES) on muscle strength and blood flow in patients with advanced chronic heart failure (CHF).

Methods and results: Patients with CHF (n=15; age 56.5 +/- 5.2 years; New York Heart Association III - IV; ejection fraction 18.7 +/- 3.3%) were examined before and after 6 weeks of LFES (10 Hz) of the quadriceps and calf muscles of both legs (1 h/day, 7 days/week). Dynamometry was performed weekly to determine maximal muscle strength (F(max); N) and isokinetic peak torque (PT(max); Nm); blood flow velocity (BFV) was measured at baseline and after 6 weeks of LFES using pulsed-wave Doppler velocimetry of the right femoral artery. Six weeks of LFES significantly increased F(max) (from 224.5 +/- 96.8 N to 340.0 +/- 99.4 N; p<0.001), and also PT(max) (from 94.5 +/- 41.5 Nm to 135.3 +/- 28.8 Nm; p<0.01). BFV in the femoral artery increased after 6 weeks from 35.7 +/- 15.4 cm/s to 48.2 +/- 18.1 cm/s (p<0.05); BFV values at rest before and after 6 weeks of LFES did not differ significantly.

Conclusions: LFES may improve muscle strength and blood supply, and could be recommended for the treatment of patients with severe CHF.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Biomarkers / blood
  • Blood Flow Velocity
  • Body Mass Index
  • C-Reactive Protein / analysis
  • Chronic Disease
  • Coronary Circulation / physiology*
  • Electric Stimulation*
  • Female
  • Heart / physiopathology*
  • Heart Failure / blood
  • Heart Failure / physiopathology*
  • Heart Failure / therapy
  • Humans
  • Male
  • Middle Aged
  • Muscle, Skeletal / blood supply
  • Muscle, Skeletal / physiopathology
  • Shear Strength*
  • Ventricular Function, Left

Substances

  • Biomarkers
  • C-Reactive Protein