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. Author manuscript; available in PMC: 2013 Apr 21.
Published in final edited form as: Muscle Nerve. 2010 Sep;42(3):348–354. doi: 10.1002/mus.21687

FIGURE 3.

FIGURE 3

The overall results for normalized power and normalized power per HZ for the interference (left column) and rectified (right column) EMG signals obtained while subjects performed contractions at 15% and 50% of their MVC. For both the normalized power and normalized power per HZ, the interference EMG signals exhibited greater power (P < 0.001) in the 13–30-HZ and 30–60-HZ frequency bands and lower power between 100 and 500 HZ (left column) at 50% compared with 15% MVC. In contrast, rectified EMG signals exhibited greater power between 60 and 150 HZ and lower power between 200 and 500 HZ (right column) at the higher force level. Asterisk indicates significant differences between the two force levels.