Figure 1 - uploaded by Nihat Özgören
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Change in PT and (a) MNF, (c) MDF, (e) NoP for three muscles through the test.
Source publication
The aim of this study was to (1) focus on the number of peaks methods (NoP) as an
alternative method for electromyography (EMG) analysis and to (2) compare the
performance of this method with two traditional EMG parameters, mean frequency (MNF)
and median frequency (MDF) in assessment of muscle fatigue during cyclic dynamic
contractions. A total of...
Contexts in source publication
Context 1
... MNF, MDF, and NoP for RF, VM, and VL exhibited a decreasing trend along with the PT as it is shown in Figure 1. There were positive significant correlations between PT and MNF, MDF, and NoP for the three muscles of all participants. ...
Context 2
... correlations among MNF, MDF and NoP were also positive (Table 1). The fatigue indices for PT, MNF, MDF, and NoP of all muscles were negative for all participants as it is clear from Figure 1b, 1d and 1f which indicated a decrease in all variables throughout testing. According to the Friedman's test results, there was no significant difference between the fatigue indices of RF, VM, and VL when a particular method was concerned (p-values for methods; MNF: 0.31, MDF: 0.60, NoP: 0.11). ...
Context 3
... nonlinear relationship was described between EMG and torque production using exponential functions in this study while linear (Shinohara, Kouzaki, Yoshihisa and Fukunaga, 1998) and nonlinear ( Watanabe and Akima, 2006) relationships have been discussed previously. All fatigue indices were found to be negative which indicated a decline in MDF, MNF, and NoP along with the PT as it can be clearly seen in Figure 1b, 1d and 1f. When the difference in fatigue indices of VM originating from NoP method, and the stronger correlation between NoP of VM and PT (Table 1) is considered, it is suggested that NoP may be a method which is more sensitive to frequency content of the EMG signals in dynamic fatiguing exercises since VM could have a variation in fibre composition different than RF and VL. ...
