A great tip to keep in mind when lifting 'heavy' weights with the aim to increase your explosiveness on the field - courtesy of Kelly Baggett's No Bull Speed Manual (well worth checking out!)
"So, how can you improve the speed at which you display strength while
simultaneously getting stronger? Well, the intent to contract explosively provides a high velocity specific effect and improves neural efficiency. When you lift heavy loads to
improve your strength, the resistance may move fairly slowly, yet as long as some intent to move fairly explosively is there, the explosive nature of the contraction results in improvements in both maximal strength and rate of force development. Thus you get the best of both worlds."