occurs at the myofibril level.
Rarely is this term applied to stretches which are forcibly produced by voluntary muscular contractions
. Active stretching, as can by typified by the "cat stretch," is employed successfully in the cat kingdom, by most humans waking in the morning, and by bodybuilders in their posing routines.
Some patients generically defined as paraplegic, at a deeper assessment, show a residual active muscular contraction
due to a partial neurological recovery or to the reversibility of their condition (i.e., alcoholic neuropathy).
EMG-BFB is a technique that enabled the physical therapist to readily determine the electromyographic levels of a particular physiological process (in our case, the muscular contraction
or relaxation), and with appropriate training, it also accustomed the patient to manipulate the same process by an internalised mechanism and improve coordination and voluntary control (Watson, 2000).
Patient history was an integral part of diagnosis and typically revealed a history of physical activity with forceful muscular contraction
followed by a popping sensation and pain in the affected area resulting in difficulty with ambulation.
In the present study, a linear relationship was observed between the force of muscular contraction
and the RMS value, and demonstrated that this parameter of quantification can be used in future static and functional analyses.
Even minimal changes in the body's water content can impair muscular contraction
. Like a piston in an automobile engine that seizes due to lack of oil for lubrication, muscle fibers go into spasm, and power production is reduced noticeably.
Muscle "tension" is defined by some as excess muscular contraction
and by others as simply muscular contraction
This may be due to the wide insertions of the laryngeal muscles along the laryngeal cartilages and the lack of tendons as with other skeletal muscle,  and it may also play a role in rapid muscular contraction
Mild asthmatics can get away with drugs that just reverse the muscular contraction
, providing immediate relief of symptoms.
The exercise should employ the same type of muscular contraction
. For example, in the push-off, the calf muscles undergo a fairly explosive shortening contraction after being pre-tensed.
Coaches working with beginners should pay special attention to the development of the right reflexes, as it is the coordination and synchronization of the muscular contraction
that produces maximum efficiency.