Ethical standard and study design
The study adopts a randomized-balanced crossover design. Ethical approval was obtained from the local independent institutional review board (protocol-number 2019–04, 05.03.2019, Ethics Committee Department 5 Psychology and Sports Sciences Goethe-University Frankfurt). The trial was conducted in accordance with the ethical standards set down by the declaration of Helsinki (World medical Association Declaration of Helsinki–Ethical Principles for Medical Research Involving Human Subjects) with its recent modification of 2013 (Fortaleza). All participants gave written informed consent prior to study enrolment.