Table 2 Decomposed EMG measures of Vastus lateralis and Vastus medialis during contractions at intensities equivalent to end-test torque (ETT), 50%, 75%, 150% and 175% ETT.

From: Force fluctuations regulation and the role of neurophysiological mechanisms throughout different isometric contraction intensities

   

MUAPa (µV)

FRa (pps)

Condition

MU (Nr.)

Accuracy (%)

Mean ± SD

95% CI

Mean ± SD

95% CI

Vastus Lateralis

50% ETT

15.5 ± 4.24

95.2 ± 0.90

0.059 ± 0.026b, c,d

[0.048,0.069]

6.94 ± 1.39a, b,c, d

[6.40,7.49]

75% ETT

16.9 ± 4.59

95.3 ± 0.96

0.095 ± 0.076c, d

[0.065,0.124]

7.81 ± 1.55b, c,d

[7.20,8.41]

ETT

16.3 ± 4.68

95.5 ± 0.97

0.125 ± 0.096 c, d

[0.088,0.163]

8.69 ± 1.48c, d

[8.11,9.27]

150% ETT

17.1 ± 4.19

95.5 ± 0.61

0.193 ± 0.160

[0.130,0.256]

9.70 ± 1.29

[9.20,10.20]

175% ETT

16.9 ± 4.64

95.6 ± 0.76

0.200 ± 0.100

[0.161,0.239]

9.61 ± 1.21

[9.14,10.10]

Vastus Medialis

50% ETT

15.9 ± 3.47

95.0 ± 1.01

0.058 ± 0.027b, c,d

[0.047,0.068]

7.20 ± 1.55a, b,c, d

[6.59,7.81]

75% ETT

17.4 ± 4.32

95.2 ± 0.91

0.083 ± 0.044c, d

[0.066,0.101]

7.84 ± 1.76 b, c,d

[7.15,8.53]

ETT

20.9 ± 4.29

95.5 ± 0.87

0.114 ± 0.055 c, d

[0.092,0.136]

8.54 ± 1.95c, d

[7.77,9.30]

150% ETT

18.3 ± 4.00

95.0 ± 1.22

0.180 ± 0.107

[0.138,0.222]

9.37 ± 1.86

[8.64,10.1]

175% ETT

19.3 ± 5.52

95.1 ± 0.82

0.215 ± 0.138

[0.161,0.269]

9.33 ± 1.73

[8.65,10.0]

  1. MUAPa motor unit action potentials amplitude, FRa average firing rate, SD standard deviation, CI confidence interval. Symbols indicate a statistically significant difference compared to the following: a 75% ETT, b ETT, c 150% ETT, d 175% ETT.