The potential use of spectral electromyographic fatigue as a screening and outcome monitoring tool of sarcopenic back muscle alterations

Kienbacher, Thomas; Habenicht, Richard; Starek, Christian; Mair, Patrick; Wolf, Markus; Paul, Birgit; Riegler, Sara; Kollmitzer, Josef; Ebenbichler, Gerold

doi:10.1186/1743-0003-11-106

Journal of NeuroEngineering and Rehabilitation

Table 2 Summary of the MF-EMG variables recorded and averaged from all 3 days

From: The potential use of spectral electromyographic fatigue as a screening and outcome monitoring tool of sarcopenic back muscle alterations

Initial median frequency
Hz average from 3 test days		Mean (SE)	Age	Gender	Age X Gender	Age and gender dependant differences
		Hz	F; p-value	F; p- value	F; p- value	Age gender mean (95% CI)
All electrodes	<50	91.74 (1.75)	00.84; 0.36	00.56; 0.46	0.07; 0.79	−2.20 (-06.96; 2.48) 1.88 (-2.69; 6.37)
All electrodes	>50	93.94 (1.66)	00.84; 0.36	00.56; 0.46	0.07; 0.79	−2.20 (-06.96; 2.48) 1.88 (-2.69; 6.37)
L5	<50	102.81 (1.72)	07.53; < 0.01	00.29; 0.59	0.10; 0.75	−7.64 (-13.17;-2.08) -1.42 (-7.20; 4.07)
L5	>50	110.45 (2.23)	07.53; < 0.01	00.29; 0.59	0.10; 0.75	−7.64 (-13.17;-2.08) -1.42 (-7.20; 4.07)
L2	<50	90.10 (2.12)	01.33; 0.25	00.51; 0.48	0.02; 0.89	−3.28 (-08.60; 1.91) 2.06 (-3.27; 7.35)
L2	>50	93.37 (1.80)	01.33; 0.25	00.51; 0.48	0.02; 0.89	−3.28 (-08.60; 1.91) 2.06 (-3.27; 7.35)
L1	<50	80.85 (1.77)	00.08; 0.78	00.01; 0.90	0.36; 0.55	0.58 (-03.90; 4.88) 0.14 (-4.43; 4.63)
L1	>50	80.26 (1.55)	00.08; 0.78	00.01; 0.90	0.36; 0.55	0.58 (-03.90; 4.88) 0.14 (-4.43; 4.63)
Most negative electrode	<50	75.25 (1.53)	00.08; 0.77	00.20; 0.66	0.01; 0.94	−0.62 (-04.65; 3.51) 0.98 (-3.19; 4.95)
	>50	75.87 (1.36)
Median frequency slope decline
Hz/s average from 3 test days		Mean (SE)	Age	Gender	Age X Gender	Age and gender dependant differences
		Hz/s	F; p-value	F; p- value	F; p- value	Age gender mean (95% CI)
All electrodes	<50	−0.20 (0.03)	05.67; 0.02	02.06; 0.16	0.41; 0.53	−0.10 (-0.17; -0.02) -0.06 (-0.14; 0.02)
All electrodes	>50	−0.11 (0.02)	05.67; 0.02	02.06; 0.16	0.41; 0.53	−0.10 (-0.17; -0.02) -0.06 (-0.14; 0.02)
L5	<50	−0.24 (0.04)	04.26; 0.04	00.17; 0.68	0.01; 0.98	−0.10 (-0.19; -0.01) -0.02 (-0.12; 0.08)
L5	>50	−0.14 (0.03)	04.26; 0.04	00.17; 0.68	0.01; 0.98	−0.10 (-0.19; -0.01) -0.02 (-0.12; 0.08)
L2	<50	−0.19 (0.03)	02.79; 0.10	01.91; 0.17	0.06; 0.80	−0.08 (-0.16; 0.02) -0.06 (-0.15; 0.03)
L2	>50	−0.12 (0.03)	02.79; 0.10	01.91; 0.17	0.06; 0.80	−0.08 (-0.16; 0.02) -0.06 (-0.15; 0.03)
L1	<50	−0.14 (0.03)	03.79; 0.06	00.55; 0.46	0.62; 0.43	−0.07 (-0.14; -0.01) -0.03 (-0.10; 0.04)
L1	>50	−0.07 (0.02)	03.79; 0.06	00.55; 0.46	0.62; 0.43	−0.07 (-0.14; -0.01) -0.03 (-0.10; 0.04)
Most negative electrode	<50	−0.46 (0.04)	08.78; < 0.01	00.57; 0.45	0.22; 0.64	−0.15 (-0.24; -0.06) -0.04 (-0.15; 0.06)
	>50	−0.31 (0.03)
Median frequency slope decline normalized to initial median frequency
%/s average from 3 test days		Mean (SE)	Age	Gender	Age X Gender	Age and gender dependant differences
		%	F; p-value	F; p-value	F; p- value	Age gender mean (95% CI)
All electrodes	<50	−0.21 (0.03)	05.14; 0.03	01.47; 0.23	0.19; 0.66	−0.10 (-0.18; -0.02) -0.06 (-0.14; 0.03)
All electrodes	>50	−0.12 (0.02)	05.14; 0.03	01.47; 0.23	0.19; 0.66	−0.10 (-0.18; -0.02) -0.06 (-0.14; 0.03)
L5	<50	−0.26 (0.04)	06.40; 0.01	00.17; 0.68	0.01; 0.98	−0.13 (-0.23; -0.04) -0.02 (-0.13; 0.08)
L5	>50	−0.12 (0.03)	06.40; 0.01	00.17; 0.68	0.01; 0.98	−0.13 (-0.23; -0.04) -0.02 (-0.13; 0.08)
L2	<50	−0.20 (0.03)	02.35; 0.13	01.62; 0.20	0.16; 0.69	−0.07 (-0.16; 0.03) -0.06 (-0.15; 0.04)
L2	>50	−0.13 (0.03)	02.35; 0.13	01.62; 0.20	0.16; 0.69	−0.07 (-0.16; 0.03) -0.06 (-0.15; 0.04)
L1	<50	−0.16 (0.03)	03.13; 0.08	00.52; 0.47	0.75; 0.39	−0.08 (-0.16; 0.00) -0.03 (-0.11; 0.05)
L1	>50	−0.08 (0.02)	03.13; 0.08	00.52; 0.47	0.75; 0.39	−0.08 (-0.16; 0.00) -0.03 (-0.11; 0.05)
Most negative electrode	<50	−0.46 (0.03)	09.15; < 0.01	00.19; 0.66	0.01; 0.99	−0.15 (-0.23; -0.05) -0.02 (-0.13; 0.07)
Most negative electrode	>50	−0.32 (0.03)	09.15; < 0.01	00.19; 0.66	0.01; 0.99	−0.15 (-0.23; -0.05) -0.02 (-0.13; 0.07)
Median frequency fatigue right - left imbalances
Hz average from 3 test days		Mean (SE)	Age	Gender	Age X Gender	Age and gender dependant differences
		%	F; p-value	F; p- value	F; p- value	Age gender mean (95% CI)
Uncompensated	<50	8.21 (0.42)	00.01; 0.92	00.10; 0.75	2.35; 0.13	0.00 (-1.43; 1.22) 0.14 (-1.18; 1.48)
Uncompensated	>50	8.22 (0.53)	00.01; 0.92	00.10; 0.75	2.35; 0.13	0.00 (-1.43; 1.22) 0.14 (-1.18; 1.48)
Compensated	<50	−1.63 (0.79)	00.16; 0.69	06.64; 0.01	0.62; 0.43	−0.49 (-2.81; 1.97) 2.96 (0.65; 5.13)
	>50	−1.14 (0.95)

This table further presents the results of the 2 way ANOVAS (age, gender) as well as those of the subsequent intergroup comparisons.

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ISSN: 1743-0003

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