Cliffs: Contrary to broscience, longer rest periods between sets (3-5 minutes) are more effective at building muscle than shorter rest periods (30 seconds to 2 minutes).
As someone who has been engaged in weightlifting for almost 30 years, this is no surprise. It probably has little to do with the rest period itself and more to do with the intensity of exercise. You simply can't train with weights in the 5RM-10RM range, going to failure or a rep or two shy of failure, and only rest 30 seconds or 1 minute between sets. Such short rest periods will force you to use much lighter weights and stop way short of failure.
As someone who has been engaged in weightlifting for almost 30 years, this is no surprise. It probably has little to do with the rest period itself and more to do with the intensity of exercise. You simply can't train with weights in the 5RM-10RM range, going to failure or a rep or two shy of failure, and only rest 30 seconds or 1 minute between sets. Such short rest periods will force you to use much lighter weights and stop way short of failure.