Confusing take home message from this study, they report that GH was significantly higher 1 min after resistence exercise for the 60sec rest groups COMPARED to the 120sec rest groups. No mention of the 90sec rest groups though. I guess 60sec and 90sec were NOT significantly different for GH.
Further down, we see that testosterone was 76% higher in 90sec groups compared to 60sec groups.
Overall 90sec rest intervals looks like a good average for both GH and Testosterone.