contraction


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Related to contraction: muscle 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.

con·trac·tion (C),

(kon-trak'shŭn), Do not confuse this word with contracture.
1. A shortening or increase in tension; denoting the normal function of muscle.
2. Shrinkage or reduction in size.
3. Heart beat, as in premature contraction.
[L. contractus, drawn together]

contraction

(kən-trăk′shən)
n.
1. The act of contracting or the state of being contracted.
2.
a. A word, as won't from will not, or phrase, as o'clock from of the clock, formed by omitting or combining some of the sounds of a longer phrase.
b. The formation of such a word.
3. Physiology The shortening and thickening of functioning muscle or muscle fiber.
4. A period of decreased business activity.

contraction

Cardiology A heart beat. See Premature ventricular contraction GI disease The shortening of the muscularis propria of the GI tract, resulting in peristalsis. See Giant peristaltic contraction Obstetrics The shortening of myometrial cells, resulting in ↑ intrauterine tension. See Braxton Hicks contraction Physiology A ↓ in muscle length, accompanied by ↑ tension. See Concentration contraction, Isometric contraction, Isotonic contraction.

con·trac·tion

(C) (kŏn-trak'shŭn)
1. A shortening or increase in tension; denoting the normal function of muscle.
2. A shrinkage or reduction in size.
3. Heart beat, as in premature contraction.
[L. contractus, drawn together]

contraction

The primary function of muscle by which a change of shape brings the ends closer together. By contracting, muscles bring about movement of bones or other parts. The term comes from a Latin word meaning ‘to draw together’ so, strictly, a phrase such as ‘isotonic contraction’ is a contradiction in terms. Popular usage, however, will have it that a muscle can contract without shortening.

Contraction

A tightening of the uterus during pregnancy. Contractions may or may not be painful and may or may not indicate labor.
Mentioned in: Premature Labor

con·trac·tion

(kŏn-trak'shŭn) Do not confuse this word with contracture.
1. Condition wherein maxillary and mandibular structures are closer than normal to median plane.
2. A shortening or increase in tension; denoting the normal function of muscle.
3. Shrinkage or reduction in size.
[L. contractus, drawn together]
References in periodicals archive ?
Results: Histamine and insulin produced a concentration-dependent reversible contraction of isolated tracheal muscle of guinea pig.
Sampling started 15 seconds after the onset of the muscle contraction and lasted for 4.096 seconds at a rate of 2 KHz and once more after 14 minutes of isometric contraction.
Since [f.sub.i] is a weak contraction, there exists a continuous function [[psi].sub.i] : [0, +[infinity]) [right arrow] [0, +[infinity]) such that [[psi].sub.i](t) > 0 if t > 0, and, (6) holds.
According to data of Table 6, the largest coefficients of thermal contraction and expansion of AC were determined to be 31.1 and 31.2 [mu][epsilon]/[degrees]C, respectively.
"Anecdotal evidence found that political instability continued to undermine economic performance, with issues around security and cash flow also playing a part in the latest contraction. To add to the situation, new export orders fell at the fastest rate for over a year," it said.
While the effect of acetylcholine on the frequency and force of spontaneous contractions over 5 min was seen as effect on spontaneous activity.
With early passage hMSCs (passage < 5) are used, gel contraction in the presence of high (10%) and low (4%) serum culture medium was not significantly different for 10 X [10.sup.4] hMSC per mL (F igure 3A).
When performing isometric elbow extension contraction task, the subjects were told to maintain the above posture while lifting a suitable weight from the distal part of the right forearm by means of a rope and pulley to produce a target force of 20% maximal elbow extension force.
CEAA Dose-Dependently Inhibited High [K.sup.+]-Induced TRs Contraction. Extracellular high [K.sup.+]- (80 mM [[K.sup.+]]0-) induced contraction of smooth muscles was extensively verified [18].
To study the influences of the interested factors, including age and sex, on the muscle stiffness in a relaxed state and different isometric contraction levels, four way repeated measure analyses of variance (ANOVA) (age [young and elderly] x sex [male and female] x knee joint angles [90[degrees] and 60[degrees]] x % MVC [0%-100%, 11 levels]) were used to analyze the shear modulus of the VI.
Summary: In 7M16, real GDP declined 3.0% y/y, less than the 3.4% y/y contraction recorded in 1H16.
The second chapter uses a well-organized table to alphabetically list the braille letters and contractions. The dot configuration is included for each letter and contraction.