Mean (95% confidence interval) for selected HRV indices at rest before (pre), and after 21 weeks of training (post) in the endurance, strength, combined strength and endurance training, and control group.
<p>HR, heart rate; SDNN, standard deviation of NN intervals; HFP, high frequency power; LFP low frequency power; LFP/HFP, ratio between LFP and HFP; CI<sub>1–5</sub>, complexity index of multiscale entropy analysis over the scales of 1 to 5. Statistically significant changes were not observed.</p
