Examples of challenging in a sentence. 1  I find the job challenging and fun. 2  Teaching is challenging but rewarding work. 3  It's a challenging book that requires careful reading.  The slope was challenging for even the most experienced climbers.
Electromyography (EMG) is an electrical recording of muscle activity that aids in the diagnosis of neuromuscular disease. 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.
EKG Definition. An EKG, also called an ECG or electrocardiogram, is a recording of the heart's electrical activity. It is a quick and painless procedure. EKGs captures a tracing of cardiac electrical impulse as it moves from the atrium to thventricles. These electrical impulses cause the heart to contract and pump blood.