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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 â–« are significantly different from the other groups parameters marked with â–«â–« (p < 0.006)