Table 8.
OPLS of PPT over erector spinae in FM. Regressors used data from microdialysis and spectroscopy of this muscle (except pain variables from microdialysis) (cf. Table 3 and Table 4). The regression had one predictive component. Only significant variables are shown (i.e., variables with VIP > 1.0 and absolute p(corr) ≥ 0.50).
| Variables | VIP | p(corr) |
|---|---|---|
| Pi/PCr | 1.73 | −0.69 |
| Pi/Ptot | 1.58 | −0.63 |
| Mean Glycerol Erector spinae 140–220 min | 1.52 | −0.60 |
| Glycerol Erector spinae 140 min | 1.51 | −0.60 |
| Pyruvate Erector spinae 140 min | 1.46 | −0.58 |
| Difference Blood flow Erector spinae 160 min–140 min | 1.44 | −0.57 |
| Blood flow Erector spinae 140 min | 1.41 | 0.56 |
| Lactate Erector spinae 140 min | 1.38 | −0.54 |
| PCr/Ptot | 1.36 | 0.54 |
| R2 | 0.32 | |
| Q2 | 0.24 | |
| CV-ANOVA P-value | 0.020 | |
| n | 31 |
VIP and p(corr) are reported for each regressor (i.e., the loading of each variable scaled as a correlation coefficient and therefore standardizing the range from −1 to + 1). The sign of p(corr) indicates the direction of the correlation with the dependent variable (+ = positive correlation; − = negative correlation). Hence, a positive p(corr) for a certain variable indicates a positive correlation with PPT of erector spinae in FM in the multivariate context. The four bottom rows report R2, Q2, P-value of the CV-ANOVA, and number of subjects included in the regression (n) from the OPLS regression (see Statistics for details).