Development potentials of commonly used high-intensity training strategies on central and peripheral components of maximal oxygen consumption.

The aim of this study was to reveal the development potentials of five high-intensity training models on central and peripheral components of maximal oxygen consumption (VO). Following VO determination, maximal cardiac output (Q), maximal stroke volume (SV), and maximal arteriovenous O difference (a-vO) were analysed. Short-interval- (short-HIIT), long-interval (long-HIIT), alternating work-rate continuous (alter-HIT), constant work-rate continuous (const-HIT), and sprint interval (SIT) sessions were performed on separate days with iso-effort and iso-time methods. Time spent (t) at > 95% of VO was the highest in long-HIIT (p < 0.05). The t at > 90% of Q was higher in alter-HIT than long-HIIT and SIT (p < 0.05), while there was no significant difference for t at > 90% of SV amongst high-intensity trainings. The t at > 90% of a-vO_ was higher in short-HIIT and long-HIIT than other modalities (p < 0.05). It can be said that continuous modalities seem to have a higher potential to improve central part of VO, while interval modalities may be better to develop peripheral component.