Something I forgot to mention. Tests showed that compared to overground running on that silly machine the athletes produced 35% more lactic, plus there recovery was improved by the same number, of interest i hope realising the body works all or nothing:yep.
so why is it that a marathoner can run several blocks and corral his loose Rottweiler while the couch potato can only run half a block before he is out of breath and trying to corral his dog using his remote control? One thing I learned about testing is tests are only as good as the competency of the persons performing the tests. There's an infamous test done on military rifles in which one rifle had 842 failures to fire, way more than the other rifles, but come to find out, the person conducting the test did not understand how the 3 round burst limiter functioned. And people still believe the original test, especially the ones with no real world experience.
Ignore him, he literally copy pasted every point from T-Nation, article - "Cardio Kills - How Running and Endurance Training Can Shorten Your Life." He does this kind of thing a lot in an attempt to make it look like he has a clue.