Repeated-high-intensity-running activity and internal training load of elite rugby sevens players during international matches: A comparison between halves - Suarez-Arrones, L.; Núñez, J.; Saez de Villarreal, E.; Gálvez, J.; Suarez-Sanchez, G. Munguia-Izquierdo, D. (International Journal of Sports Physiology and Performance, 2016)