Int J Sports Med 1998; 19(5): 317-322
DOI: 10.1055/s-2007-971924
Physiology and Biochemistry

© Georg Thieme Verlag Stuttgart · New York

Effects of Muscle Electrical Stimulation on Peak VO2 in Cardiac Transplant Patients

A. F. Vaquero1 , J. L. Chicharro1 , L. Gil2 , M. P. Ruiz1 , V. Sánchez2 , A. Lucía1 , S. Urrea1 , M. A. Gómez2
  • 1Unidad de Investigación, Escuela de Medicina del Deporte. Facultad de Medicina. Universidad Complutense de Madrid
  • 2Hospital Universitario Doce Octubre de Madrid, Unidad de Trasplante Cardíaco
Further Information

Publication History

Publication Date:
09 March 2007 (online)

Peak oxygen consumption (peak VO2) has become a critical component in the evaluation of heart transplant recipients (HTR). In these patients, peak VO2 remains low after cardiac transplantation mainly because of persisting peripheral limitations in the working muscles. Muscular electrical stimulation, on the other hand, has been shown to enhance the oxidative capacity of healthy muscle. It was the purpose of our investigation to study the effects of ES on the peak VO2 of HTR. Fourteen (11 males and 3 females) HTR (age: 57 ± 7 yr, mean ± SD; height: 163 ± 7 cm, weight: 70.5 ± 8.6 kg) were selected as subjects and each of them was randomly assigned to one of two groups: (a) group EXP (n = 7), receiving electrical stimulation on both quadriceps muscles during a period of 8 weeks, and (b) group CONT (n = 7), not receiving electrical stimulation. Before (PRE) and after (POST) the aforementioned 8-week period, respectively, all the subjects performed a cardiopulmonary exercise test (ramp protocol) on a cycle ergometer for peak VO2 determination. PRE values of peak VO2 were similar in both groups (17.1 ± 2.0 vs 16.9 ± 3.8 ml x kg-1 x min-1 in EXP and CONT, respectively). However, peak values of VO2 significantly increased in EXP (p < 0.05) after the period of electrical stimulation (POST peak VO2: 18.7 ± 2.0 mix kg-1), whereas no change was observed in CONT (POST peak VO2: 16.2 ± 3.2 ml x kg-1 x min-1). In conclusion, electrical stimulation could therefore be used to improve the functional capacity of HTR. and might be included in the rehabilitation programs of this population group.