the purpose o f this study was to determine the effects o f neuromuscular electrical stimulation (nmes) o f various intensities (25, 50,75, and 100 ma) and frequencies (8, 12,20, 50 hz) on energy expenditure o f the knee extensor muscles (kem). fourteen male university 世界杯2022赛程表淘汰赛 between 20 and 24 years o f age were submitted to 5 min o f each intensity at each frequency during nmes on different days with the use o f a portable stimulator (respond h, empi; impulse width of 300 microseconds; duty cycle: 55s on and 2s off) and adhesive electrodes (pals plus™, empi). oxygen uptake was measured in the supine position at rest and during nmes o f both kem. energy expenditures (kcal. hr-1 .kg o f kem -1) o f the four frequencies o f each intensity (mean : 25 ma= 1.8; 50 ma= 7.8; 75 ma= 21.6; 100 ma= 26.3) were not significantly different (p>0.05) and that of the different intensities of each frequency were significantly different (p<0.05- p<0.001) except in 50 hz between 75 and 100 ma (p>0.05). the highest energy expenditure (28.1 kcal. hr-1 .kg o f kem-1) was observed at a stimulation frequency o f 8 hz (p>0.05) at an intensity o f 100 ma.