Originally Posted by LeDoux
I think there is some support. I know hHG has been shown to increase anaerobic exercise (Birzniece et al, 2011). As far as Braun and HRs specifically... I don't think we will see a proper experiment on that topic published any time soon.
The only real effect of HGH has been in Ho's study in 2010 (he is also the senior author on the review you cited) where there was an effect of HGH on performance in the Wingate test which essentially uses a high intensity exercise challenge as a proxy for sprinting though it is actually unclear how the Wingate test actually even informs true performance.
In other words, in the body of GH literature, there is one study that suggests HGH could make cheetah's better able to catch antelope while the preponderance of studies addressing HGH and athletic performance indicate in Dr. Ho's own words, "In summary, there appears to be no evidence that GH enhances muscle strength, power, or aerobic capacity in trained adult athletes".
So really as the literature stands, there isn't any support for the notion that HGH would help Ryan Braun hit more homers.
HGH in and of itself is pretty much a dud for baseball players wanting to increase their normal performance.