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Another way to maintain tension is to stay in continuous motion by eliminating the pause at the top and at the bottom. Pausing at the bottom of a barbell curl or dumbbell lateral raise, for example, has absolutely no purpose whatsoever. You are simply resting between reps.
The next time you do biceps or shoulders, try a few sets of barbell curls and dumbbell lateral raises with no pause whatsoever. Do not stop moving until the set is finished. You will be forced to reduce your weight substantially, but remember, form is more important than weight. The combination of continuous motion with not locking out will give you a killer workout you won’t forget!
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The pause at the bottom CERTAINLY has a purpose. It helps ELIMINATE momentum. Without it you have the stretch reflex in which your muscles are bounding back like a rubber band. I don't know how he can say that eliminating the pause and thus allowing momentum to come into play will force you to lower the weight, it seems just the opposite to me. In any case, you definitely want to eliminate momentum helping you get the weight up, so his suggestion is pretty silly, imo.
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Slowing down your concentric can be equally if not more effective than negatives—they literally force you to maintain perfect form. When slowing down your concentric movement, you will notice the biggest difference in exercises where you usually use momentum to get the weight started.
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So it is the pause at the bottom that relaxes the stretch response and eliminates momentum not the slow speed of the concentric after you've started the lift. He just doesn't make any sense to me.
Obviously, if you are using a protocol where the weight is lightened you would want to control the speed of the concentric to avoid inertia carrying the weight forward at the upper half of the movement. If the weight is heavy enough and we pause at the bottom, then one can utilize a dynamic movement without overcoming the weight to the point that we lose tension.