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140518 Adrenaline lifting
Lifting more than normal is not unusual under certain circumstances. This is frequently seen on the platform by athletes who make excellent use of their powers of generating positive result producing psychological and physical energy. In the gyms though, unless testing for a one repetition maximum, this is not a good training method.
The release of adrenaline, a hormone secreted by the adrenal medulla when stimulated by the central nervous system responding to stress, comes with limitations. It is not produced in great quantities and what is there is in limited supply until the body manufactures more over a period of time. If this is used too often, and excessively, it will eventually cause the body to use it but not realize the benefits.
This happens because the body begins to tolerate the initial stress response that caused the secretion in the first place and then disregards it. But the substance has still been released into the system. An increase in heart rate, blood pressure, carbohydrate metabolism and greater heart output results. All of which are stress responses. Essentially the body habituates to the influx of adrenaline and the energy that it provides is no longer realized by the lifter.
Left unattended these cause high blood pressure and heart problems.
 A hormone secreted in the adrenal gland that raises blood pressure, produces a rapid heartbeat, and acts as a neurotransmitter when the body is subjected to stress or danger