Table 2. Mean (±SD) normalized EMG (percentage of maximum voluntary contraction) of the erector spinae (ES) and multifidus (MF) in injured and uninjured athletes.
Knee angle
(°)
ES
MF
Uninjured
Injured
Uninjured
Injured
Passive
0
5.92 ±
3.88
9.53 ±
5.99*
8.12 ±
3.41
10.01 ±
4.04*
45
5.55
± 3.72
9.74
± 5.83*
8.80
± 4.85
9.15
± 5.03*
90
3.86 ±
1.97
8.47 ±
5.16*
6.63 ±
4.00
7.31 ±
3.51*
Active
0
22.30
± 12.84^
28.79
± 15.56^
26.85
± 9.20^
34.21
± 11.61^
45
21.74 ±
11.60
26.00 ±
18.13
26.50 ±
11.60
30.82 ±
16.87
90
17.39
± 8.13
17.62
± 11.75
21.92
± 12.35
23.93
± 13.79
* significantly greater compared to the uninjured group,
^ values collapsed for groups greater compared to the active knee flexion test at 90°;
# values collapsed for groups greater than values at 0, 45 and 90° active knee flexion tests, p < 0.05.