Different Training Modalities Improve Energy Cost and Performance in Master Runners.

The aim of this study was to compare the effects of continuous moderate-intensity and discontinuous high-intensity training on running performance in master runners. Thirty-four male master runners (47.2 ± 7.4 years) were assigned to three different groups: continuous moderate-intensity training (CMIT), discontinuous high-intensity training (DHIT), and control group (CON). CMIT and DHIT performed 8-week of supervised training (3 session·wk; ~35 km·wk) while CON maintained their normal training habits (3-4 session·wk; ~50 km·wk). Peak oxygen consumption ([Formula: see text]O) and peak running speed (v) during incremental treadmill exercise, gas exchange threshold (GET), speed at GET, energy cost of running (Cr), and 5-km performance were evaluated before and after training. Following the training period, both CMIT and DHIT significantly reduced Cr (-4.4 and -4.9%, respectively, < 0.05), increased speed at GET (3.4 and 5.7%, < 0.05) and improved 5-km time-trial performance (3.1 and 2.2%, < 0.05) whereas no differences were found for [Formula: see text]O and GET (as %[Formula: see text]O). After training, v improved only for DHIT (6%, < 0.05). No differences were found in any variable for CON. This study indicates that both CMIT and DHIT may positively affect running performance in middle-aged master runners. This improvement was achieved despite a significant reduction of the amount of weekly training volume.