Table of PCA-3 using 15 variables of interest, including “muscle” (i.e., SS or control), showing correlation coefficients for variables loaded on the 3 PCs extracted from the analysis of data from 27 participants.

In the row for each variable, numbers indicate the strength of correlation of that variable with the eigenvector of each PC. When the absolute value of correlation coefficients was ≥ 0.35, they were considered important (bold font) in defining the PC. Variables loaded on PCs 1–3, appear in the PCA plot (Fig 4C) with an asterisk (*) to indicate they also project upward.