Skeletal muscle has this amazing ability to adapt to being overloaded. When weight bearing loads are repeatedly placed upon them, muscle responds by increasing in size and strength. Exercise is the most powerful stimuli for inducing reorganization of muscle cells. Genetics play a large role in muscle mass potential, as does diet and growth factors. These growth factors have become common terms in body building circles. They are advertised as having the ability to supersize muscles.
Growth factors are produced by the body and are very involved in muscle building. They work with each other to help bring about the desired goal: well-defined, larger muscles. One of these growth factors is a substance called insulin-like growth factor 1 (IGF-1). IGF-1 stimulates growth. It has been found to promote bone growth in osteoporotic individuals, enhance the growth of children, and has been linked with preventing muscle wasting in the elderly.
Several tissues produce IGF-1. Muscles themselves produce it in response to resistance exercise. IGF-1 circulating in the blood is typically produced …
read more »