Purpose: To compare the cardiorespiratory responses of a traditional session of high-intensity interval training session with that of a session of similar duration and average load, but with decreasing workload within each bout in cyclists and runners. Methods: A total of 15 cyclists (maximal oxygen uptake [
Beltrami, Roos, von Ow, and Spengler are with the Exercise Physiology Lab, Inst of Human Movement Sciences and Sport, ETH Zurich, Zürich, Switzerland. Spengler is also with the Zurich Center for Integrative Human Physiology (ZIHP), University of Zurich, Zurich, Switzerland.