And let's not forget the fact that the reliability and the validity of isokinetic devices has been questioned for years. You cannot convert ST to FT anymore than you can convert a mule into a racehorse. Further, it's believed that explosive movements will somehow bypass the ST fibers and target the FT fiber population and, if so, this would be a clear violation of the orderly recruitment pattern suggested by Henneman's Size Principle of Fiber Recruitment. In fact, a study by Desmedt and Godaux found that this orderly recruitment pattern does indeed occur with ballistic contractions. In truth, lifting weights with rapid speeds of movement isn't as effective as lifting weights with controlled speeds of movement.
Same thing happens with free weight exercises, by the way.
Open an exercise physiology text and look at a force-velocity curve. So, LOW velocity means HIGH tension and HIGH velocity means LOW tension. And we owe it all to momentum. Another belief is that high-velocity movements produce the greatest power outputs. If anything, the opposite may be true.