Fast repetitions or slow:
For people trying only to gain strength and power, faster repetition is OK (in fact, faster repetitions are good for athletes trying to develop 'explosive power).
But FOR HYPERTROPHY, slower repetitions would work better.
Rest period between sets:
Longer rest periods let recovery of oxygen and clearance of lactic acid.
But FOR HYPERTROPHY, you want to put your body under lactic acid stress.
Moreover, low rest period between sets creates swelling of cells and retention of water, resulting in swelling (PUMP).
Because pump expands muscle fibers and sheaths, it helps in hypertrophy.
So doing supersets with only 15 seconds rest periods between the sets would give great pump and increase hypertrophy.
For people trying only to gain strength and power, faster repetition is OK (in fact, faster repetitions are good for athletes trying to develop 'explosive power).
But FOR HYPERTROPHY, slower repetitions would work better.
Rest period between sets:
Longer rest periods let recovery of oxygen and clearance of lactic acid.
But FOR HYPERTROPHY, you want to put your body under lactic acid stress.
Moreover, low rest period between sets creates swelling of cells and retention of water, resulting in swelling (PUMP).
Because pump expands muscle fibers and sheaths, it helps in hypertrophy.
So doing supersets with only 15 seconds rest periods between the sets would give great pump and increase hypertrophy.