Intermittent runs at the velocity associated with maximal oxygen uptake enables subjects to remain at maximal oxygen uptake for a longer time than intense but submaximal runs - Billat, V L; Slawinski, J; Bocquet, V; Demarle, A; Lafitte, L; Chassaing, P; Koralsztein, J P (Eur J Appl Physiol, 2000)