Table 2.
Average EMG (μV) for each muscle at each percentage of HAT (head, arms, trunk segment). The asterisks signify significant differences between 140 and 160 % of HAT values for the muscle in that row.
%HAT
100
120
140
160
Mean
SD
Mean
SD
Mean
SD
Mean
SD
Left ULES
Con
24.60
15.88
33.80
21.77
32.9
66.51
159.3
*
143.41
LBP
10.79
19.95
6.21
67.23
78.53
56.82
152.3
*
183.71
Right ULES
Con
31.10
35.24
45.40
41.94
30.2
46.68
172.9
*
142.94
LBP
14.24
30.45
35.46
51.25
84.48
30.76
217.4
*
331.06
Left LLES
Con
14.20
15.25
23.00
17.54
15.84
37.93
74.3
*
50.91
LBP
3.46
16.67
15.71
39.95
11.10
32.42
29.80
49.64
Right LLES
Con
12.50
17.43
22.20
18.20
13.5
47.31
93.5
*
94.20
LBP
2.01
21.03
18.48
28.76
50.31
68.26
53.51
108.52
Left biceps femoris
Con
7.00
15.18
19.13
27.35
0.12
40.50
119.0
*
185.11
LBP
18.71
29.79
58.09
109.67
124.09
139.24
125.27
354.92
Right biceps femoris
Con
19.60
24.74
16.80
36.05
23.10
45.06
129.7
*
186.95
LBP
13.73
28.33
65.76
63.05
183.51
359.86
53.17
144.73
Con: Control. LBP: Low back pain. ULES: Upper lumbar erector spinae. LLES: Lower lumbar erector spinae