Paula Born Lopes (2021) “A Systematic Review of Validity and Reliability of Perceived Exertion Scales to Older Adults”, Revista de Psicología del Deporte (Journal of Sport Psychology), 29(4), pp. 74–89. Available at: https://rpd-online.com/index.php/rpd/article/view/230 (Accessed: 23 April 2024).