Effect of loading on unintentional lifting velocity declines during single sets of repetitions to failure during upper and lower extremity muscle actions. - Izquierdo,M.; Gonzalez-Badillo,JJ.; Hakkinen,K.; Ibanez,J.; Kraemer,WJ.; Altadill,A.; Eslava,J.; Gorostiaga,EM. (Int J Sports Med, 2006)