Table 2.
Regression coefficient (β) and 95% confidence intervals (CI) for all motor unit parameters
| Regression coefficient (β) | Confidence Interval (CI) | Significance (p) | |
|---|---|---|---|
| MUP features | |||
| MUP amplitude | |||
| Y | −160 | −234: −85.5 | p<0.001 |
| YA | −93.4 | −179: −8.17 | p=0.032 |
| O | −179 | −321: −35.9 | p=0.014 |
| MA | −61.2 | −151: 28.6 | p=0.182 |
| MUP area | |||
| Y | −316 | −462: −170 | p<0.001 |
| YA | −154 | −321: 13.4 | p=0.071 |
| O | −292 | −521: −62.9 | p=0.012 |
| MA | −45.5 | −244: 153 | p=0.653 |
| Turns | |||
| Y | −0.588 | −0.975: −0.201 | p=0.003 |
| YA | −0.430 | −0.747: −0.114 | p=0.008 |
| O | −0.696 | −1.19: −0.2 | p=0.006 |
| MA | −0.062 | −0.397: 0.273 | p=0.716 |
| MUP:sMUP amplitude | |||
| Y | −1.06 | −1.52: −0.602 | p<0.001 |
| YA | −1.11 | −1.55: −0.67 | p<0.001 |
| O | −0.695 | −1.34: −0.051 | p=0.034 |
| MA | −0.865 | −1.45: −0.283 | p=0.004 |
| NFM features | |||
| NFM area | |||
| Y | -1.03 | −1.64: −0.42 | p=0.001 |
| YA | -0.88 | −1.54: −0.22 | p=0.009 |
| O | -1.36 | −2.35: −0.379 | p=0.007 |
| MA | -0.71 | −1.50: 0.078 | p=0.077 |
Multilevel mixed effects linear regression model outputs for young controls (Y), young athletes (YA), old controls (O), master athletes (MA), motor unit potential (MUP), surface motor unit potential (sMUP), near fibre motor unit potential (NFM)