isometric contraction


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Related to isometric contraction: isometric 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.

i·so·met·ric con·trac·tion

force development at constant length. Compare: isotonic contraction.

isometric contraction

Etymology: Gk, isos, equal, metron, measure; L, contractio, a drawing together
muscular contraction not accompanied by movement of the joint. Resistance applied to the contraction increases muscle tension without producing movement of the joint. Also called muscle-setting exercise.

i·so·met·ric con·trac·tion

(ī'sō-met'rik kŏn-trak'shŭn)
Force development at constant length.
Compare: isotonic contraction

isometric contraction

contraction in which a muscle stays at the same length, e.g. when holding a weight steady; isometric exercise (syn static exercise) exercise in which this condition obtains. See also force-velocity relationship.

isometric

maintaining, or pertaining to, the same length; of equal dimensions.

isometric contraction
muscle contraction without appreciable shortening or change in distance between its origin and insertion.
isometric exercise
active exercise performed against stable resistance, without change in the length of the muscle.
References in periodicals archive ?
Sustained isometric contractions for as long as 20 to 30 seconds have been associated with increases in the synthesis of actin and myosin in the muscle, (4,12) probably mediated by these same pathways.
Less indication of muscle damage in the second than initial electrical muscle stimulation bout consisting of isometric contractions of the knee extensors.
2012) have found that RDF was enhanced after training with explosive isometric contractions (1 s "fast and hard"), whereas no changes in RFD were found following resistance training focusing on maximum force, rather than explosive actions (Tillin et al.
Manual muscle testing has been tested for validity and reliability and is a procedure often used to identify the maximum voluntary isometric contraction (MVIC) so that EMG activity during separate trials can be compared as a percentage of the MVIC (Cuthbert and Good heart, 2007; Frese et al.
9) Baseline maximal voluntary isometric contraction (MVIC), one repetition maximum (1RM), peak power, and range of motion (ROM) before the first and the second acute eccentric bouts (1st and 2nd, respectively) for the training group (TG) and the control group (CG).
During this experiment, the subjects were required to produce a force of 50% of their maximum voluntary isometric contraction force during the curl up and leg raise exercises for about 60s.
The authors suggest that during the isometric contraction muscle spindle activity declined to support the motoneuron pool, and consequently firing frequency decreased.
Each set lasted 5 min and was composed of 25 6-s isometric contraction / 6-s rest cycles.
Resistance equal to that of the patient is an isometric contraction and increases tension in the agonist muscle but without movement; this is associated with increased strength or tone of this muscle.
The study revealed that the Shake Weight[TM] radically outperforms free weights due to the rapid motion of the exercise and isometric contraction of the entire upper body during use.
Instead of EMG-BFB protocol, the CG patients followed the same period of isometric contraction sessions.
The yoga intervention involved a 20-minute progression of seated, standing and supine yoga postures that included isometric contraction and relaxation of different muscle groups and regulated breathing.