Table 2 Results of the concentric RMS-EMG obtained from 76 healthy individuals that performed the cyclic submaximum lifting task. For these 76 subjects a fitted EMG dataset was available on at least one test day and the mechanical variables of test performance were comparable between age groups. Note that significant changes of the RMS-SEMG with the duration of the exercise and normalized to the onset are indicated by “*” (Bonferroni corrected sig. Level = p < 0.005)
n = 153 | Intercept | Slope normalized to intercept | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Level | Mean (SE) | Age F; p | Sex F; p | Age:Sex F; p | tnr F; p | Mean (SE) | Age F; p | Sex F; p | Age:Sex F; p | tnr F; p | |
All | < 50 | 1.31 (0.04) | 0.3; 0.6 | 1.8; 0.2 | 2.7; 0.1 | 2.3; 0.1 | 0.32 (0.06)* | 1.7; 0.2 | 0.7; 0.4 | 1.4; 0.2 | 0.6; 0.6 |
> 50 | 1.28 (0.04) | 0.18 (0.04)* | |||||||||
multifidus (L5) | < 50 | 1.36 (0.07) | 1.0; 0.3 | 4.3; 0.043 | 2.3; 0.1 | 1.2; 0.3 | 0.34 (0.08)* | 2.2; 0.1 | 0.0; 0.9 | 1.8; 0.2 | 0.8; 0.5 |
> 50 | 1.27 (0.04) | 0.12 (0.04) | |||||||||
longissimus (L2) | < 50 | 1.41 (0.05) | 1.2; 0.3 | 1.6; 0.2 | 1.3; 0.3 | 1.6; 0.2 | 0.29 (0.06)* | 0.3; 0.6 | 1.0; 0.3 | 0.4; 0.5 | 0.0; 1.0 |
> 50 | 1.32 (0.05) | 0.23 (0.05)* | |||||||||
iliocostalis lumborum (L1) | < 50 | 1.16 (0.04) | 1.3; 0.3 | 0.1; 0.7 | 1.6; 0.2 | 0.6; 0.6 | 0.33 (0.05)* | 2.3; 0.1 | 2.7; 0.1 | 1.4; 0.2 | 1.2; 0.3 |
> 50 | 1.25 (0.04) | 0.20 (0.04)* | |||||||||
most negative electrode | < 50 | 0.95 (0.03) | 1.4; 0.2 | 0.0; 0.9 | 1.1; 0.3 | 0.7; 0.5 | −0.04 (0.05) | 0.1; 0.7 | 0.1; 0.7 | 0.9; 0.4 | 0.0; 1.0 |
> 50 | 1.02 (0.03) | −0.02 (0.03) | |||||||||
uncomp. Imbalances | < 50 | 26.4 (3.0) | 0.1; 0.7 | 3.0; 0.1 | 0.4; 0.5 | 0.6; 0.5 | |||||
< 50 | 24.6 (1.9) | ||||||||||
comp. Imbalances | < 50 | −3.1 (3.5) | 0.9; 0.3 | 0.2; 0.7 | 0.0; 0.8 | 1.7; 0.2 | |||||
< 50 | −8.7 (2.9) | ||||||||||