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https://www.ncbi.nlm...pubmed/27935085
INTRODUCTION:
Muscle activation was investigated during resistance exercise with 2 relatively high-intensity loads.
METHODS:
Ten resistance-trained men performed the leg press exercise to repetition failure: a set at 70% of 1-repetition maximum (1RM) and a set at 90% of 1RM.
Surface electromyography (EMG) was used to assess peak and mean muscle activation of the vastus lateralis, rectus femoris, and vastus medialis.
RESULTS:
Peak and mean EMG remained greater at 90% than 70% 1RM across all repetitions (P = 0.03 and P = 0.02, respectively).
Main effects for trial were also significant for mean EMG activity of the final common repetitions (P = 0.03) favoring 90% 1RM;
however, peak EMG activity was similar during the final common repetitions of the 70% and 90% 1RM sets.
CONCLUSIONS:
Across all repetitions, 90% 1RM appears to produce greater muscle activation during the leg press exercise,
but similar peak EMG was observed during the final common repetitions of each set.
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