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Table 2 The results of the non-parametric Mann-Whitney U test

From: Central motor control failure in fibromyalgia: a surface electromyography study

 

MCG

FM

p level

CV initial values (m/s)

4.07 ± 0.45

4.32 ± 0.36

NS

CV rate of change (m/s2)

-0.02 ± 0.01

-0.02 ± 0.01

NS

CV norm. rate of change (%/s)

-0.50 ± 0.29

-0.46 ± 0.23

NS

MNF initial values (Hz)

62.28 ± 17.22

57.63 ± 13.26

NS

MNF rate of change (Hz/s)

-0.43 ± 0.29

-0.44 ± 0.19

NS

MNF norm. rate of change (%/s)

-0.64 ± 0.31

-0.74 ± 0.20

NS

ARV initial values (μV)

28.53 ± 13.12

21.24 ± 9.44

NS

ARV rate of change (μV/s)

0.17 ± 0.22

0.16 ± 0.15

NS

ARV norm. rate of change (%/s)

0.58 ± 0.72

0.78 ± 0.64

NS

  1. Mean values ( ± SD) of EMG variables during electrically elicited contractions in the two groups. The results of the non parametric Mann-Whitney U test are reported.
  2. MCG = Matched Control Group, FM = Fibromyalgic group, MVC = maximal voluntary contraction, CV = conduction velocity, MNF = mean spectral frequency, ARV = average rectified value; NS = non significative