There's a large drop in implied 1RM from 10 to 11 reps on the chart, but minimal drop between 12-15 reps. Does that mean progressing in the 5-10 or 8-12 range (both of which seem to be ~13% 1RM range) is more efficient than progressing in the 12-15 range?
Generally yes, once you start going past 12 reps, higher threshold fibers take longer to recruit and more metabolic fatigue can accumulate versus neuromuscular. All rep ranges build muscle, but if you want lower end strength benefits at the same time, 12 reps is about the limit. That said, if you dont care about lower end strength, then it does not matter.
There's a large drop in implied 1RM from 10 to 11 reps on the chart, but minimal drop between 12-15 reps. Does that mean progressing in the 5-10 or 8-12 range (both of which seem to be ~13% 1RM range) is more efficient than progressing in the 12-15 range?
Generally yes, once you start going past 12 reps, higher threshold fibers take longer to recruit and more metabolic fatigue can accumulate versus neuromuscular. All rep ranges build muscle, but if you want lower end strength benefits at the same time, 12 reps is about the limit. That said, if you dont care about lower end strength, then it does not matter.