Alternating number of sets/reps?

[sebastian11]

What effect would it have if one chest workout i do 5 sets with 5 reps at a heavier weight and then the next chest workout i do 3 sets with 10 reps at a lesser weight?

 

[Jitterbug]

Progressive resistance.

As long as you're always working a little harder, it doesn't matter how you mix it up.

 

[mrRuckus]

Poliquin says generally a workout stops working after 6 times. So if you are concerned about this, i'd say change the reps about that often, not every other workout.

I've been generally sticking with the same exercises but changing reps every cycle for a while now. Every time after a deload i come back in with a different rep scheme if even only slightly.

DB rows particularly i've been changing the reps from anywhere between 6 and 25 and it's been working wonderfully.