J Strength Cond Res. 2009 Mar;23(2):480-5.
Determining the optimal load for resisted sprint training with sled towing.
Alcaraz PE, Palao JM, Elvira JL.
Department of Physical Activity and Sport Sciences, Kinesiology and Biomechanics Laboratory, San Antonio Catholic University of Murcia, Guadalupe, Murcia, Spain. pedro.e.alcaraz@gmail.com
and more…..the key is what is detrimental….having people show up and working hard will get results but give the credit to the resistance helping with overload not speed development. Speed Strength and strength speed exist but they are not trumping sprinting + weights.