 Planning analysis: The main outcome will be change in the strength of the quadriceps over the 6-week electrostimulation program. The other end-points will be mid-thigh and calf muscle cross-sectional area, lower limb muscle endurance, ventilation, dyspnea, leg fatigue, operational lung volumes at iso-time and walking time during an endurance shuttle walk, muscle hypertrophyingatrophying pathways and muscle aerobic capacity. For each group, pre- and post-training comparisons will be made using a repeated measures design. The magnitude of the pre- and post-training changes will also compared between both groups with a two-way ANOVA group, training effect with repeated measures on the second factor training effect. A p value 0.05 will be considered statistically significant. 