Some explain it through physiological conditions, where 6 to 15 reps elicit the greatest stimulation of sarcoplasmic and myofibrillar hypertrophy, the two different types of muscle growth.

有些人通过生理条件来解释，其中 6 到 15 次重复次数引起肌浆和肌原纤维增厚的最大刺激，这是两种不同类型的肌肉生长。