Gabrys, Tomasz, Michal Garnys, Urszula Szmatlan-Gabrys, Lidia Stanisz, Remigiusz Rzepka, and Artur Lukasiewicz. 2018. “Results of Intensity Variable Effort on Condition of Polish National Team Cross Country MTB Cyclists”. Journal of Science and Cycling 6 (3). https://jsc-journal.com/index.php/JSC/article/view/345.