Correlation between variables
HEAT
Figure Pearson correlation coefficients heat mapping for delta value in maximal strength, serum AMPK, PGC-1α, irisin, IGF-1 and MSTN in TRT group (a) and FRT group (b). AMPK, AMP-activated protein kinase; PGC-1α, peroxisome proliferator-activated receptor-γ coactivator-1α; IGF-1, insulin-like growth factor-1; MSTN, myostatin; BBS, barbell back squat; BP, bench press; DL, deadlift; LF, leg flexion; significant correlation * p < 0.05, ** p < 0.01; TRT, traditional resistance training; FRT, functional resistance training.