eccentric contraction


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Related to eccentric contraction: Isotonic contraction

contraction

 [kon-trak´shun]
a drawing together; a shortening or shrinkage.
Braxton Hicks c's see braxton hicks contractions.
carpopedal contraction the condition resulting from chronic shortening of the muscles of the upper and lower limbs including the fingers and toes, seen in tetany.
concentric contraction contraction resulting in shortening of a muscle, used to perform positive work or to accelerate a body part. It is metabolically more demanding than an eccentric contraction. Called also shortening contraction.
Dupuytren's contraction Dupuytren's contracture.
eccentric contraction contraction in the presence of a resistive force that results in elongation of a muscle, used to perform negative work or to decelerate a body part. It is less metabolically demanding than a concentric contraction but may cause disruption of associated connective tissue with delayed soreness or frank injury if it occurs in an unaccustomed manner. Called also lengthening contraction.
end-diastolic premature ventricular contraction a ventricular ectopic beat falling at the end of diastole; it may or may not be slightly premature and may or may not be a fusion beat.
haustral c's muscular contractions of the wall of the large intestine during which the haustra can be seen more easily; called also haustrations.
isometric contraction muscle contraction without appreciable shortening or change in distance between its origin and insertion.
isotonic contraction muscle contraction without appreciable change in the force of contraction; the distance between the origin and insertion becomes lessened.
lengthening contraction eccentric contraction.
postural contraction the state of muscular tension and contraction that just suffices to maintain the posture of the body.
segmental c's muscular contractions of the small intestine that serve to mix and transport chyme.
shortening contraction concentric contraction.
contraction stress test observation of the fetal heart rate in response to uterine contractions; see also fetal monitoring.
tetanic contraction (tonic contraction) physiological tetanus.
Volkmann's contraction Volkmann's contracture.

eccentric contraction

controlled relaxation of a contracted muscle, movement occurring as a result of the lengthening of the muscle(s).

eccentric contraction

Negative contraction Sports medicine Muscle contraction that occurs while the muscle is lengthening as it develops tension and contracts to control motion by an outside force. Cf Concentric contraction.

ec·cen·tric con·trac·tion

(ek-sen'trik kŏn-trak'shŭn)
A lengthening action in which a muscle's attachments are drawn away from one another by an external resistance, even though the muscle is activated. Often called negative work.
See also: concentric contraction
References in periodicals archive ?
Sakamoto, "Histological skeletal muscle damage and surface EMG relationships following eccentric contractions," Journal of Physiological Sciences, vol.
The "sliding filament theory" [23] has been a dogmatic explanation for muscle contraction, but it has difficulties in accurately predicting the force and energy efficiency of eccentric contractions. Several theories have been put forth to explain the mechanism of eccentric contractions.
(2003) RPE, pain, and physiological adjustment to concentric and eccentric contractions, Medicine and Science in Sports and Exercise 35(6), 1017-1025.
Most HHDs measure the isometric type of contraction, and isokinetic dynamometers can test the strength of both concentric and eccentric contractions. Concentric contractions cause muscle shortening, while eccentric contractions cause muscle lengthening.
Every lift consists of a concentric contraction and an eccentric contraction.
Al, 1986, applied eccentric contraction to the leg flexors to young and elderly women and determined their CK levels.
Studies (6,14,20,21,24,27) have shown that eccentrically biased acute exercise of high eccentric contraction component results in ultrastructural muscle injury.
Eccentric contraction is commonly used during training programs to improve muscular power for the quadriceps muscles [1].
The major muscular contraction involved in active stretches is the eccentric contraction. In this contraction, the muscle develops tension while the overall length of the muscle increases by stretching under tension.
As a result, there is more stress on the shorter sarcomeres during an eccentric contraction causing them to elongate relatively further than the longer sarcomeres (3).
Optimal function of the lower limb during weight bearing and closed chain activities requires both concentric and eccentric contraction of the involved muscles in order to minimize ground reaction forces imposed on the ankle-foot complex [6,11].
Stretch-shortening cycle (SSC) exercise is defined as the eccentric contraction of an active muscle immediately followed by a concentric contraction (Komi, 1984).