After hot dogs are purchased, they may be kept refrigerated for about 1 week after the sell-by date on the package if it has been properly stored. Unopened hot dogs may be kept in their original store packaging when refrigerating; to maximize the shelf life of hot dogs, do not open the package until ready to use.
Definition. 1  Electromyography (EMG) is an electrical recording of muscle activity that aids in the diagnosis of neuromuscular disease. 2  Muscles are stimulated by signals from nerve cells called motor neurons. This stimulation causes electrical activity in the muscle, which in turn causes contraction. This electrical activity is detected by a needle electrode inserted into the muscle and connected to a recording device. Together, the electrode and recorder are called an electromyography machine.
During a needle EMG, a needle electrode inserted directly into a muscle records the electrical activity in that muscle. A nerve conduction study, another part of an EMG, uses electrodes taped to the skin (surface electrodes) to measure the speed and strength of signals traveling between two or more points.