Types of hypertrophy

There are two different types of muscular hypertrophy: sarcoplasmic hypertrophy and myofibrillar hypertrophy. During sarcoplasmic hypertrophy, the volume of sarcoplasmic fluid in the muscle cell increases with no accompanying increase in muscular strength. During myofibrillar hypertrophy, the myofibrils, comprised of the actin and myosin contractile proteins, increase in number and add to muscular strength as well as a small increase in the size of the muscle.