Prolonged strength training induces significant adaptations that result in an increase in the size, strength, and power of the muscles being trained.
Increased levels of anabolic hormones as a result of weight training can increase hormonal interactions with various cellular mechanisms and help develop contractile units of muscle protein. When stimulation occurs from a motor neuron to initiate muscle contraction, various signals are sent from the brain and muscle to the endocrine glands.
During and after weight training, these hormones are released because of the physiological stress caused by exercise. The release of hormones provides the body with information about the amount and type of physiological stress (e.g., adrenaline), metabolic demands (e.g., insulin), and the need for metabolic changes during rest. Thus, certain patterns of nerve stimulation through resistance training lead to certain hormonal changes, which together trigger certain mechanisms necessary for recovery and adaptation to severe physical exertion.
Stress patterns and the hormonal response combine to shape the adaptive tissue response to a particular training program (e.g., TA or powerlifting). So, not to confuse you further, the specific strength produced by muscle fibers determines changes in hormonal receptor sensitivity to anabolic hormones as well as changes in receptor synthesis. Just a day or two of weight training can increase the amount of androgen receptors (testosterone receptors) in muscle tissue. Combined, these changes lead to muscle growth and increased strength in the intact muscle.
After strength training, under conditions of hormonal secretion that provide an anabolic effect, muscle tissue regeneration takes place.
This means increased synthesis of actin and myosin and decreased protein degradation. But there’s a downside to all this cool stuff in strength training. If the load is too much for the athlete, catabolic activity in the muscle can exceed anabolic activity as a result of the inability of anabolic hormones to bind to receptors or suppression of receptors in the muscle tissue. Πoetho, hormonal activity is important both during and after exercise to respond to the demands of physical stress. The magnitude of the hormonal response depends on the amount of tissue stimulated, the amount of tissue reconstructed, and the amount of tissue recovered after strength training.
Only the muscle fibers involved in strength training are able to adapt. Β In this case, genetics and muscle fiber types play a role (I know some of you have been waiting for this). Ηey, some fibers may be closer to an athlete’s genetic ceiling in terms of cell size, while others may have more potential for growth. This is the point at which people infer that Κpoccfitepa use doping, because many people believe that people have a certain ceiling for cell growth, but ultimately, until we see your genetic year, no one can know for sure what your genetic ceiling is for skeletal muscle cell size. Πpoco just because someone doesn’t look like you doesn’t mean it’s impossible.
Now back to hormones:
the degree of hormonal interaction during muscle fiber growth is directly related to adaptive fiber size. Thus, if an exercise program uses the same exercises over and over again, only a certain set of muscle fibers associated with that movement will be activated and stimulated to grow. Because Κpoccfit is the epitome of diversity, most of the time people are working different muscle groups at any given time, which promotes growth of all muscle groups, not just one single muscle group. Studies have shown that the amount of work, rest period between workouts and type of exercise are vital to the adaptive response and magnitude of hormonal changes in men and women.