EFFECT OF HIGH FREQUENCY (HF) AND LOW FREQUENCY (LF) NEUROMUSCULAR ELECTRICAL STIMULATION (NMES) OF LOWER LIMB MUSCLES ON SYMPTOM PERCEPTION AND FUNCTIONAL WALKING CAPACITY IN SEVERE COPD. CDF [Internet]. 2024 Aug. 20 [cited 2026 Jul. 20];53(02):5058-69. Available from: https://cuestionesdefisioterapia.com/index.php/es/article/view/4193