Comparison of low-frequency electrical myostimulation and conventional aerobic exercise training in patients with chronic heart failure.
BACKGROUND
Physical training is recommended as an efficient therapy in patients with chronic heart failure (CHF). Low-frequency electrical myostimulation (EMS) has recently been suggested as a good alternative to conventional aerobic training. The aim of this study was to compare the effects of EMS and conventional exercise training in patients with moderate to severe CHF.


METHODS
Twenty-four patients with stable CHF (56.7+/-7.3 years, New York Heart Association grades II and III) underwent 5 weeks of exercise training, 5 h a week, using EMS (n=12) or conventional (n=12) training programmes. At baseline and after the training period, patients performed a symptom-limited cardiopulmonary test, a 6-min and a 200-m walk exercises and an evaluation of maximal knee extensor strength.


RESULTS
Oxygen uptake (VO2) and workload at the end of exercise (peak values) and at ventilatory threshold increased after EMS (P< or =0.05) and conventional exercise (P<0.05) training programmes. The slope of the relationship between VO2 and workload was reduced after EMS (P<0.05). The time to recover half of peak VO2 decreased irrespective of the training programme (P<0.001). EMS and conventional exercise training programmes also increased the maximal knee extensor strength (P<0.05), the distance walked in 6 min (P<0.01) and decreased the time elapsed to cover 200 m (P<0.05). These improvements were not statistically different between EMS and conventional exercise.


CONCLUSIONS
In patients with moderate to severe CHF, 5 weeks of EMS and conventional exercise training produce similar improvements to exercise capacity and muscle performance.
Deley
Gaelle
G
Laboratoire INSERM ERM 207, Université de Bourgogne, Dijon, France. gdeley@u-bourgogne.fr
Kervio
Gaelle
G
Verges
Bénédicte
B
Hannequin
Armelle
A
Petitdant
Marie-France
MF
Salmi-Belmihoub
Sonia
S
Grassi
Bruno
B
Casillas
Jean-Marie
JM
D000368:Aged; D004599:Electric Stimulation Therapy; D005080:Exercise Test; D005081:Exercise Therapy; D005260:Female; D006333:Heart Failure / Q000628:therapy*; D006801:Humans; D007717:Knee / Q000502:physiology; D007866:Leg / Q000502:physiology; D008297:Male; D008875:Middle Aged; D018482:Muscle, Skeletal / Q000502:physiology*; D010101:Oxygen Consumption; D010809:Physical Fitness; D014891:Weight Lifting