Effects of neuromuscular electrical stimulation of various frequencies and intensities of energy expenditure
Wilson, Ron M.
Master of Science
SubjectMuscles Effect of electric stimulation on.
Muscles Effect of transcutaneous electrical nerve stimuation on.
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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 students 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.