Anabolic boards
It is clear however, that growth hormone (GH), fibroblast growth factors (FGF) and insulin-like growth factors (IGF) play a central role in this process. anabolic boards Anabolic steroid books. Insulin-like growth factor I (IGF-I) peptide levels have been shown to increase in overloaded skeletal muscles (G. R. Adams and F. anabolic boards Free-bodybuilding-diet. Haddad. J. Appl. anabolic boards Bodybuilding pictures of arnold schwarzenegger. Physiol. 81: 2509-2516, 1996). In that study, there was an increase in IGF-1 content before measurable increases in muscle protein and was correlated with an increase in muscle DNA content. Several other studies have shown that muscle fibers undergoing hypertrophy, due to mechanical stress, express elevated levels of IGF-I prior to hypertrophy. IGF-1 appears to be an important regulator of the nuclear to cytoplasmic ratio. Studies have show that a muscle will only undergo hypertrophy if it can maintain the ratio of the cell's volume to the number of nuclei within a finite limit. In the study above, a relatively "unloaded" muscle, the anterior tibialis, was injection with 0. 9 - 1. 9 micrograms/kg/day of rhIGF-1 which then mimicked the effects of physically loading the muscle. There was an increase in protein content, cross sectional area and DNA content. The increase in muscle DNA is presumed to be a result of increased proliferation and differentiation of satellite cells which donate their nuclei upon fusion with damaged or hypertrophying muscle cells. Take note that the quantities of IGF-1 used in the injections were extremely small, much smaller than studies that have shown relatively poor results from administering IGF-1 systemically which range from 1. 0 to 6. 9 milligrams/kg/day. All of the attention and discussion of half-hazzardly injecting fat into muscles to increase the girth of a limb is only a symptom of the obsessive nature of bodybuilding.
Anabolic boards
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