Originally Posted by BendtheBar
That's true. Heavy weight invokes contraction for rows and pulls. Just the act of standing (traps and lats), hanging (lats) or bending (lats) and holding the weight engages the lats, as it attempts to hold the arms/shoulders/etc. into place. This contraction, or contracting action is much more intense than anything we could try to create through lighter weight and mind muscle.
Then the question becomes, how much cheeting is acceptable? Legs will begin to take the load for the back involuntarily on heavy rows, unless they are chest supported.