Speed fluctuation during a 10 km run affects subjective exertion and blood lactate levels of world-class athletes - Takii, Y.; Sumi, D.; Matsunaga, R.; Ko, Y.; Marcora, S.; Taniguchi, N.; Sakaguchi, M. (29th Annual Congress of the European College of Sport Science, 2-5 July 2024, Book of Abstracts, 2024)