For some of my lifts I think I focus on the negatives on the last rep just out of habit. Never usually on my heavier compound movements, but if I'm doing my db side raises, or my seated bicep curls I'll hold the weight at the top of the movement and then lower slowly just to really feel the burn. Whether this is making a difference....*shrug*
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using a 1 rep max weight (or heavier) and just doing negatives?
failing at say 5 reps then doing a few negatives with the same weight?
For the second option, the problem will be getting that weight up in the first place...makes the workout a bit of a pain if you constantly have to have a spotter getting it up for you.
Negatives strengthen the tendons more than they help the muscles
like scud's mentioned, they strengthen the tendons, i would most probably agree with this, but becuase for negatives you can handle the weight load alot higher i think, like in a cheap way, i really think it ruins the tendons into nothing but major pain (unless your doing half your 1rm negatives?).
Negative is the best thing you can do on your repetition. It helps eliminate momentum and adds density to your muscles.
You get a double whammy when you put emphasis on negative. Muscles function is not only to contract but also to hold, stretch, and relax. If you emphasize all of them, then you really are working your muscles.