1. Sarcoplasmic hypertrophy (Seemingly muscular)

    Growth of the "fluid elements" that comes about when you tax the sarcoplasm. When you get a stronger muscle pump or stronger response (need) to hold some kind of fluid, your body responds by better handling the fluid increase on a regular basis. This is the growth that looks "bloated", as, only the volume of sarcoplasmic fluid in the muscle cell increases with no accompanying increase in muscular strength. It is more dominant in the muscles of Bodybuilders.

  2. Myofibrillar hypertrophy (Actually muscular)

    Growth of the "actual muscle fibers" that comes about when you tax the muscles. When you make muscles stronger (increase their need to contract), your body responds by growing the muscle fibers. This is the growth that leads to stronger muscle contractions, as, 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. It is more dominant in the muscles of Olympic weightlifters.
Image result for sarcoplasmic vs myofibrillar hypertrophy

Note -
These two forms of adaptations rarely occur completely independently of one another; one can experience a large increase in fluid with a slight increase in proteins, a large increase in proteins with a small increase in fluid, or a relatively balanced combination of the two.

References -



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