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Table 2 M-wave characteristics

From: Altered muscle membrane potential and redox status differentiates two subgroups of patients with chronic fatigue syndrome

 Group 1 (N = 39)Group 2 (N = 33)
Rectus femoris
 Delta M wave amplitude (%)− 41 ± 4+ 14 ± 3***
 Delta M wave duration (%)+ 18 ± 3#+ 2 ± 3***
 Delta M wave latency (ms)+ 2.65 ± 0.17+ 0.07 ± 0.04***
Flexor digitorum longus
 Delta M wave amplitude (%)− 65 ± 4+ 22 ± 5***,#
 Delta M wave duration (%)+  ± 4+ 8 ± 2
 Delta M wave latency (ms)+ 0.26 ± 0.07+ 0.04 ± 0.05**
  1. Maximal variations in M-wave amplitude and duration expressed as a percentage of resting values. Latencies measured at rest and at the end of the post-exercise recovery period. Symbols indicate that the changes in each group differ significantly from control values (i.e. rest data) (#p < 0.01; p < 0.001). Asterisks denote significant intergroup differences (***p < 0.001). Post-exercise variations in M-wave latencies are not significant