contraction

(redirected from concentric contraction)
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contraction,

in physics: see expansionexpansion,
in physics, increase in volume resulting from an increase in temperature. Contraction is the reverse process. When heat is applied to a body, the rate of vibration and the distances between the molecules composing it are increased and, hence, the space occupied by the
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.

contraction,

in writing: see abbreviationabbreviation,
in writing, arbitrary shortening of a word, usually by cutting off letters from the end, as in U.S. and Gen. (General). Contraction serves the same purpose but is understood strictly to be the shortening of a word by cutting out letters in the middle, the omission
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.

contraction

[kən′trak·shən]
(graphic arts)
A microfilm defect in the form of a compressed image that occurs when the film speed is reduced as the document passes through a rotary microfilmer.
(mathematics)
A function f from a metric space to itself for which there is a constant K that is less than 1 such that, for any two elements in the space, a and b, the distance between f (a) and f (b) is less than K times the distance between a and b.
(mechanics)
The action or process of becoming smaller or pressed together, as a gas on cooling.
(physiology)
Shortening of the fibers of muscle tissue.

contraction

Of concrete, the sum of volume changes occurring as the result of all processes affecting the bulk volume of a mass of concrete.

contraction

1. Physiol any normal shortening or tensing of an organ or part, esp of a muscle, e.g. during childbirth
2. Pathol any abnormal tightening or shrinking of an organ or part

contraction

References in periodicals archive ?
Mean muscle power of triceps brachii muscle during concentric contractions using a load of 75% of the subject's 1RM in the trained and untrained groups during the drop-set (DS) and reverse drop-set (RDS) methods.
The acute exercise based on concentric contractions was the type that resulted in the highest concentrations of HSP70 in heart, kidney, gastrocnemius and soleus, but not in the lung, suggesting that metabolic stress in the former tissues was more intense at the selected time of six hours post-exercise, the optimal time-point after stress (Jing et al., 2007).
Considering that P2 consists of concentric knee extension, reduced angular velocity during the backward Fente motion (P2) appeared to be related to decreased concentric contraction of the quadriceps.
For the measurement of concentric contraction, the isokinetic concentric mode was used.
When comparing RMS values for the concentric contractions between IDC and DBC exercises, no statistical differences were observed, even when considering each phase independently (Figure 2).
Hence, in the initial downward motion, the longer eccentric contraction of hip joint extensors in elderly may increase concentric contraction of flexors at the knee joint, which would not significantly decrease angular displacement of the knee joint.
Thus, from among the five concentric contractions performed on the isokinetic dynamometer, the contraction with the highest torque was used for electromyographic analysis.
For this reason, clinicians and researchers should focus on evaluation and training of eccentric as well as concentric contractions [7,9] in musculoskeletal disorders including CAI.
Physiological costs of eccentric contraction are different from concentric contractions, because the recruitment pattern of eccentric exercise is different from that of an equivalent concentric workload [27].
This constitutes the theory of muscle movement and the physiology of concentric contractions.
The trials consisted of: 1, isometric contractions at angles of 80[degrees], 90[degrees], and 100[degrees] of plantar flexion; 2, peak torque and power at six isokinetic angular velocities at 60[degrees], 90[degrees], 120[degrees], 180[degrees], 240[degrees], and 300[degrees] per second; and 3, a fatigue test consisting of 30 maximal concentric contractions at 300[degrees] per second, where the amount of work produced and the percentage of decline in work produced was measured.
Force in eccentric contractions is generally greater than in isometric or concentric contractions (Griffin, 1987; Walmsley, Pearson, & Stymiest, 1986).