Even at very low dose, caffeine improves vertical jump performance in a dose-independent manner - Matsumura, T.; Takamura, Y.; Fukuzawa, K.; Nakagawa, K.; Tomoo, K.; Nonoyama, S.; Tsukamoto, H.; Shinohara, Y.; Iemitsu, M.; Nagano, A.; Isaka, T.; Hashimoto, T. (28th Annual Congress of the European College of Sport Science, 4-7 July 2023, Paris, France, 2023)