Has this not been common knowledge for a long time? The argument for high load/low reps has always been that it a) saves time and b) will increase your strength (vs. muscle size) more. Both of which are important factors, especially if you are doing strength training not for cosmetic but health reasons. The number of 8-12 reps to muscle failure has been promoted because a too low number of reps (too high load) seems not to induce as much hypertrophy and is bad for your joints, etc..
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