the sympathetic nervous system is that portion of the autonomic, or involuntary, nervous system that ignites the fight or flight response in animals, including people, when they are faced with peril or stress. In such a situation, the sympathetic nervous system prompts the release of catecholamines, biochemicals such as adrenaline and norepinephrine that set the heart racing, increase alertness and prime the muscles for getaway or battle. when the crtc2 protein received and read certain signals from the catecholamines, it would turn around and send a chemical message to genes in muscle cells that would set in motion processes resulting in larger, stronger muscles. in other words, the catecholamines were involved in improving fitness after all. catecholamines are released only during exercise that the body perceives as stressful, so without some physical strain, there are no catecholamines, no messages from them to the crtc2 protein, and no signals from crtc2 to the muscles. you will still see muscular adaptations, if your exercise is light and induces no catecholamine release, but those changes may not be as pronounced or complete as they otherwise could have been. once a routine is familiar, your sympathetic nervous system grows blasé, holds back adrenaline and doesn’t alert the crtc2 proteins, and few additional adaptations occur. INTENSITY IS A COMPLETELY RELATIVE CONCEPT. BUT THE POINT IS TO GET OUT OF YOUR BODYS COMFORT ZONE.
Posted on: Fri, 27 Jun 2014 05:00:13 +0000