Postpoliomyelitis syndrome(2) Prognosis(1) Mobility limitations(1) multiple sclerosis(1) Post-polio syndrome(1) walking(1) Muscular fatigue(1) Facioscapulohumeral dystrophy type 1(1) Late effects of poliomyelitis(1) Longitudinal studies(1) Electric stimulation(1) Myopathy(1) L-citrulline(1) Skeletal muscle fibers.(1) 6MWT(1) Quality of life(1) muscle weakness(1) poliomyelitis(1) Quantitative MRI(1)