When It Comes to Fitness, No Pain No Gain!
Patricia Thompson stashed this in Random Tidbits
We have to get out of our comfort zone:
In other words, the catecholamines were involved in improving fitness after all.
What this finding means, Dr. Conkright said, is that “there is some truth to that idea of ‘no pain, no gain.’” Catecholamines are released only during exercise that the body perceives as stressful, he said, 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, he added, 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.
The study also underscores the importance of periodically reassessing the intensity of your workouts, Dr. Conkright said, if you wish to continually improve your fitness. Once a routine is familiar, your sympathetic nervous system grows blasé, he said, holds back adrenaline and doesn’t alert the CRTC2 proteins, and few additional adaptations occur.
The good news is that “intensity is a completely relative concept,” Dr. Conkright said. If you are out of shape, an intense workout could be a brisk walk around the block. For a marathon runner, it would involve more sweat.
“But the point is to get out of your body’s comfort zone,” Dr. Conkright, “because it does look like there are unique consequences when you do.”