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Purpose:  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.   Methods:  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 −1 ; ~35 km·wk −1 ) while CON maintained their normal training habits (3–4 session·wk −1 ; ~50 km·wk −1 ). Peak oxygen consumption (    V  ˙    O 2peak ) and peak running speed (v peak ) 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.   Results:  Following the training period, both CMIT and DHIT significantly reduced Cr (−4.4 and −4.9%, respectively,  P  < 0.05), increased speed at GET (3.4 and 5.7%,  P  < 0.05) and improved 5-km time-trial performance (3.1 and 2.2%,  P  < 0.05) whereas no differences were found forV  ˙    O 2peak  and GET (as %    V  ˙    O 2peak ). After training, v peak  improved only for DHIT (6%,  P  < 0.05). No differences were found in any variable for CON.   Conclusions:  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.

Different Training Modalities Improve Energy Cost and Performance in Master Runners