Dobosiewicz, Anna Maria, Paulina Miętkowska, Agnieszka Marszałek, Sylwia Wendland, Piotr Chyba, Grzegorz Duda, and Szymon Kwiatkowski. 2017. “The Use of the Valsalva Manoeuvre in the Evaluation Mechanisms Regulation of Cardiovascular System – Study Case”. Journal of Education, Health and Sport 7 (7):927-39. https://apcz.umk.pl/JEHS/article/view/4819.