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Table 3 Mean MUP and SMUP morphology and mean MU firing rates across the four groups.

From: Motor unit potential morphology differences in individuals with non-specific arm pain and lateral epicondylitis

  Control
n = 37
At-risk
n = 8
LE
n = 11
NSAP
n = 16
  Mean ± SD Mean ± SD Mean ± SD Mean ± SD
Needle-detected MUPs     
Amplitude (μV) 491.1 ± 300.7* 444.1 ± 233.4 519.0 ± 426.6† 420.9 ± 282.4**‡
Duration (ms) 7.64 ± 2.85* 9.76 ± 2.99**‡ 9.70 ± 3.16**‡ 8.36 ± 2.68**†
Number of Phases 2.55 ± 0.71* 2.72 ± 0.77 2.63 ± 0.81 2.74 ± 0.82**
AAR (ms) 1.27 ± 0.43* 1.43 ± 0.39**▫ 1.62 ± 0.59**†▫▫ 1.34 ± 0.43**‡
Mean MU Firing rate (Hz) 14.98 ± 2.97* 14.73 ± 3.04 13.86 ± 2.71** 14.53 ± 2.68**
Surface-detected MUPs     
Amplitude (mV) 113.73 ± 90.73* 91.28 ± 49.45** 111.14 ± 109.53† 65.75 ± 41.58**‡
Area (mVms) 593.9 ± 507.4* 424.4 ± 230.1** 502.7 ± 518.7† 273.7 ± 182.6**‡
Duration (ms) 19.76 ± 5.52* 19.69 ± 4.54† 19.21 ± 5.93 17.25 ± 5.21**‡
  1. Parameters marked with * are significantly different from the other groups parameters marked with ** (p < 0.006)
  2. Parameters marked with † are significantly different from the other groups parameters marked with ‡ (p < 0.006)
  3. Parameters marked with ▫ are significantly different from the other groups parameters marked with ▫▫ (p < 0.006)