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 (Oviyaa Anand1* & Shanmugananth Elayaperumal2 , Trans.). (2024). Cuestiones De Fisioterapia, 53(02), 5058-5069. https://doi.org/10.48047/sfrvne80