@joncrank
Definitely some interesting stuff but I think quite a bit more research would be needed. For starters the sample group is 45 untrained people which is really not ideal - especially given the existing hypothesis that SMH only applies to untrained people.
It also trained only the leg extension and only up to 100 degrees flexion, which arguably isn't much of a stretch.
I think it would be equally reasonable to say this study just tells us that the, in a leg extension, the quads have their best leverage between 100 - 65 degrees.
I think for this research to be revolutionary it would need to be carried out on trained subjects, train multiple exercises, and put more emphasis on actually stretching the muscle, because in my view 100 degrees on leg extension isn't really a stretch.
As for the meta analysis - looks like it's looking at isometrics? Haven't read the whole thing though.