Caffeine increases work done above critical power, but not anaerobic work - Silveira, Rodrigo; Andrade-Souza, Victor Amorim; Arcoverde, Lucyana; Tomazini, Fabiano; Sansonio, Andre; Bishop, David John; Bertuzzi, Rômulo Cássio de Moraes; Lima-Silva, Adriano Eduardo (Medicine and science in sports and exercise, 2018)