article 2021 8 pages Oligomerized polyphenols in lychee fruit extract supplements may improve high-intensity exercise performance in male athletes: a pilot study Aki Kawamura, Shun Hashimoto, Miho Suzuki, Hiromasa Ueno, Masaaki Sugita JournalPhysical Activity and NutritionDOI10.20463/pan.2021.0015Study typepilot studyPopulationmale athletes View on DOI ↗