Subject characteristics.

<p>Mean ± SD.</p><p>Subject characteristics.</p

Changes in gene expression.

<p>Relative changes in gene expression of irisin-related genes following singular sessions of intense endurance exercise (END) or heavy strength training (STR). Muscle biopsies were sampled 4h post exercise. Data are mean values ± SEM. * = p≤0.05.</p

Plasma concentration of irisin.

<p>Plasma concentration of irisin measured following singular sessions of intense endurance (END) or heavy strength training (STR), or on a control day (CON) without training. Data are mean values ± SEM. The type of intervention had a significant effect on plasma irisin levels (p = 0.022; based on analyses of values from pre, 2h and 6h). There was also an effect of time after exercise (p = 0.007).</p

Lean body mass and exercise induced changes in irisin.

<p>Correlations between proportions of lean body mass and relative changes in plasma irisin following singular sessions of intense endurance exercise (END) or heavy strength training (STR), or on a control day (CON) without training. The X axis represent individual % lean body mass. The Y axis represent individual changes in irisin concentration from baseline to each of the different time points with blood samples. Correlation analyses were performed using Pearson’s method, except of the ones marked ^sp, which were performed using Spearman’s method due to a lack of normal distribution. # = p≤0.05.</p