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Table 2 Normalized lumbar extensor RMS SEMG amplitudes and kinematics

From: Age and gender related neuromuscular pattern during trunk flexion-extension in chronic low back pain patients

 

<40

40-60

>60

Men

Women

Age

Gender

Age x gender

(n:61)

(n:71)

(n:58)

(n:91)

(n:99)

 

Mean

SD

Mean

SD

Mean

SD

Mean

SD

Mean

SD

RSS

p-val

 

RSS

p-val

 

RSS

p-val

 

Normalized RMS sEMG amplitude:

             

 standing/80 % MVC

31.94

25.35

41.09

22.36

66.55

41.27

38.97

27.25

52.32

36.92

197.16

0.001

*

38.78

0.006

*

7.94

0.431

ns

 halfflexion/80 % MVC

74.00

75.33

80.28

28.80

89.48

40.36

77.66

62.71

84.21

38.14

41.33

0.241

ns

9.77

0.440

ns

60.07

0.112

ns

 maximum flexion/80 % MVC

40.85

43.31

68.66

36.41

89.47

49.30

59.26

44.30

72.36

48.46

378.90

0.001

*

31.77

0.071

ns

1.85

0.930

ns

Relative RMS sEMG amplitude changes between isometric positions (in percent):

             

 standing – half flexion

42.06

72.98

39.20

25.57

22.94

29.25

38.70

60.88

31.89

30.48

61.78

0.046

*

9.62

0.449

ns

27.82

0.329

ns

 standing - maximum flexion

8.91

41.04

27.57

32.55

22.93

37.38

20.29

36.04

20.04

39.13

62.62

0.011

*

0.35

0.834

ns

2.19

0.859

ns

 half - maximum flexion

-33.15

56.08

-11.63

26.72

-0.01

30.10

-18.40

53.58

-11.85

25.52

172.54

0.001

*

6.31

0.399

ns

43.80

0.063

ns

Half Flexion Relaxation ratio (HFR):

                  

 half/maximum flexion

3.01

2.86

1.42

0.78

1.16

0.61

2.12

2.41

1.61

1.20

0.61

0.001

*

0.05

0.093

ns

0.05

0.199

ns

Landmark positions (in degrees relative to the vertical):

                 

 mean standing TH4

13.87

3.53

15.37

4.57

14.42

4.76

15.17

4.32

14.08

4.34

0.40

0.159

ns

0.27

0.095

ns

0.26

0.272

ns

 mean standing L5

17.54

5.49

16.00

6.78

15.37

5.92

13.37

5.49

18.99

5.51

1.06

0.041

*

8.15

0.001

*

0.26

0.434

ns

Changes in position angles (in degrees):

              

 hip region (standing – maximum flexion)

53.08

11.72

58.34

11.80

59.85

12.42

54.94

11.50

59.10

12.61

7.81

0.005

*

4.10

0.026

*

1.59

0.320

ns

 lumbothoracic region (standing – maximum flexion)

57.35

9.64

49.95

9.60

46.20

10.86

50.48

10.88

51.82

11.01

20.85

0.001

*

1.02

0.171

ns

0.89

0.433

ns

 gross trunk region (standing – maximum flexion)

110.43

13.53

108.29

13.63

106.04

15.22

105.42

12.91

110.93

14.75

4.08

0.146

ns

9.21

0.006

*

4.25

0.132

ns

 hip region (standing – half flexion)

24.80

5.63

28.23

5.81

26.95

5.45

25.99

5.22

27.43

6.22

2.09

0.002

*

0.37

0.135

ns

0.24

0.489

ns

 lumbothoracic region (standing – half flexion)

26.72

13.10

26.85

9.30

27.43

10.28

26.37

9.22

27.55

12.23

0.10

0.923

ns

0.39

0.434

ns

0.43

0.688

ns

 gross trunk region (standing – half flexion)

51.52

11.44

55.08

9.94

54.38

12.12

52.36

9.03

54.98

12.75

3.01

0.089

ns

1.53

0.144

ns

0.04

0.981

ns

 % hip of gross trunk region (half flexion)

47.87

7.59

53.70

7.68

56.40

8.59

52.10

9.02

53.16

8.28

11.94

0.001

*

0.12

0.574

ns

0.06

0.925

ns

 % lumbothoracic of gross trunk region (half flexion)

52.13

7.59

46.30

7.68

43.60

8.59

47.90

9.02

46.84

8.28

11.94

0.001

*

0.12

0.573

ns

0.06

0.929

ns

 % hip of gross trunk region (maximum flexion)

50.69

16.20

52.18

11.14

50.85

10.41

50.71

11.47

51.83

13.85

0.18

0.892

ns

0.19

0.652

ns

2.91

0.212

ns

 % lumbothoracic of gross trunk region (max flexion)

49.31

16.20

47.82

11.14

49.15

10.41

49.29

11.47

48.17

13.85

0.18

0.906

ns

0.19

0.634

ns

2.91

0.200

ns

  1. RMS sEMG rout mean square surface electromyographic, *level of significance p < 0,05, ns not significant