Egan Bernal has revealed that he was distanced during stage 4 of the Giro d'Italia due to a sudden rise in his heart rate on the day's late second-category climb.

The Netcompany Ineos leader was forced to ease up on the Cozzo Tunno climb as Movistar set a high pace. Ben Turner sacrificed his own chances to help pace Bernal back on the long descent to Cosenza. They made the catch close to the finish.

Bernal managed to avoid losing any time at the finish, where Jhonatan Narváez sped to victory, but was surprised that his heart rate rose above 190bpm.