Influence of the number of players and the relative pitch area per player on heart rate and physical demands in youth soccer - Castellano, J.; Puente, A.; Echeazarra, I.; Casamichana, D. (The Journal of Strength and Conditioning Research, 2015)
Keywords: junior elite sport; soccer; heart rate; sport physiology; load; playing field; USA; biological and medical sciences; junior sports; sport games