Table 4 Results of the concentric IMDF-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 IMDF-SEMG with the duration of the exercise and normalized to the onset are indicated by “*” (Bonferroni corrected sig. Level = p < 0.005); significant groups effects are Bonferroni corrected and given in boldface if p< 0.01
n = 156 | 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 | 59.9 (1.2) | 1.6; 0.2 | 0.1; 0.7 | 0.6; 0.4 | 0.3; 0.8 | − 0.16 (0.02)* | 10.0; 0.002 | 1.7; 0.2 | 0.0; 0.9 | 1.5; 0.2 |
> 50 | 61.9 (1.2) | −0.07 (0.01)* | |||||||||
multifidus (L5) | < 50 | 67.5 (1.7) | 4.4; 0.04 | 0.7; 0.4 | 0.1; 0.7 | 1.3; 0.3 | −0.25 (0.02)* | 14.2; < 0.001 | 1.4; 0.2 | 0.0; 1.0 | 0.8; 0.4 |
> 50 | 73.5 (1.7) | −0.10 (0.02)* | |||||||||
longissimus (L2) | < 50 | 58.9 (1.6) | 1.1; 0.3 | 0.2; 0.7 | 0.8; 0.4 | 0.5; 0.6 | −0.18 (0.02)* | 6.5; 0.013 | 2.7; 0.1 | 0.0; 0.9 | 1.2; 0.3 |
> 50 | 60.9 (1.4) | −0.08 (0.02)* | |||||||||
iliocostalis lumborum (L1) | < 50 | 53.2 (1.1) | 0.4; 0.5 | 0.4; 0.5 | 0.5; 0.5 | 1.0; 0.4 | −0.06 (0.02)* | 1.5; 0.2 | 0.0; 0.9 | 0.4; 0.5 | 2.8; 0.06 |
> 50 | 51.4 (0.9) | −0.03 (0.01)* | |||||||||
most negative electrode | < 50 | 47.5 (0.9) | 1.4; 0.2 | 0.0; 0.9 | 0.6; 0.4 | 0.6; 0.5 | −0.34 (0.02)* | 17.5; < 0.001 | 8.2; 0.006 | 0.0; 0.9 | 0.5; 0.6 |
> 50 | 48.6 (0.9) | −0.20 (0.02)* | |||||||||
uncomp. Imbalances | < 50 | 9.5 (0.6) | 1.1; 0.3 | 0.1; 0.8 | 1.2; 0.3 | 0.6; 0.6 | |||||
< 50 | 8.6 (0.5) | ||||||||||
comp. Imbalances | < 50 | −2.6 (0.8) | 0.1; 0.8 | 4.6; 0.035 | 0.0; 1.0 | 0.1; 0.9 | |||||
< 50 | −2.9 (0.9) | ||||||||||