Super Slow
The big burn you feel is lactic acid build-up in your muscles. This isn't really a good thing, and also contributes to soreness rather than actual tissue breakdown. Also, doing super slow, you can't lift the amount of weight that you would if you were moving faster, so less of your muscle fiber bundles are being "fired" (used).
Super slow has been around for years and years- this is nothing new. Do a google search- there are loads of article pro and con. I personally don't like it and don't think it does much for you, but mixing it in as part of your workout for a change of pace could work. For actually building muscle, the general consensus among body builders is that it doesn't work. To build muscle, you have to break down tissue and because you are lifting lighter that you're absolute max and not lifting to failure, you are not breaking down tissue. Again, the soreness is a result of the lactic acid, not tissue breakdown.
As for everything, it comes down to what are your goals. If superslow works for what YOU want and you enjoy it, then do it. Personally, two 30 minute weight sessions / week don't meet my goals, so I don't do it. Besides, I hate lactic acid burn.
mel
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