ArA is definitely a mixed compound. Proper usage of ArA would promote a setting in which PGF2a predominates over PGE2. This would entail such things as lower volume training sessions (aka not going nuts with muscular damage induced), a high protein diet (did the subjects have a high protein diet in the study? this is a major factor IMO), and simply reaching the proper level of inflammation (too much may negatively affect body composition). Anecdotally speaking, 2g ArA preworkout on training days only has been the most effective natural supplement I've used in the whole "muscle builder/tbooster" category.