)It describes new research that claims that using lighter weights and higher reps-- up to 25-30--promotes the same amount of muscle strength as the conventional 80% of max for 8-10 reps.
No, it doesn't say that. Read the abstract of the study, it gives you a better view than the article.
What the study cites is, that there was no difference in muscle volume, aka size/growth. HOWEVER, the study also says that:
"Isotonic maximal strength gains were not different between 80%-1 and 80%-3, but were greater than 30% -3 (P=0.04),"
Which means that you get stronger with higher intensity. Tadah. No suprise there.
What I also want to note that the abstract itself didn't mention if the test group was allowed or infact did any other exercising. Also diet wasn't even mentioned, which is one of the most important factors for muscle growth and strength gains. One could also point out that the test subjects were beginners, and we all know what happens when a beginner is put to the weight room. Usually there is some sort of progress and hyperthrophy. The study, or atleast the knowledge I can read from it, is seriously lacking to prove anything for me.