eccentric action

eccentric action

active resistance by a muscle to lengthening, e.g. that of quadriceps during controlled descent of a hill or stairs. Also referred to, paradoxically and unwisely, as 'eccentric contraction' or even 'lengthening contraction'. Unlike a spring in the equivalent situation, a muscle expends energy even during such passive extension, as both excitation and cross-bridge cycling must continue, although this is a fraction of the energy cost of concentric actions generating the same force at the same absolute velocity. eccentric exercise involves the principal muscles in eccentric action. Because most (though not all) muscles can produce higher forces in this mode of action than in isometric or concentric exercise, greater training effects are widely considered to result, though greater muscle damage and delayed-onset muscle soreness (DOMS) may ensue in unaccustomed subjects. See also force-velocity relationship, muscle contraction, work.
References in classic literature ?
After a hard contest with that eccentric action of thought which had last perplexed him, he had got the better of it.
During resistance work with an elastic band, greater force is generated during each repetition during the last half of the concentric action and the first half of the eccentric action, and there is an enhanced transition from the concentric phase to the eccentric phase because of the decreasing overall band length on the return to the resting position.
Consequently he is a regular in their directors' box at home matches which is how he spurred Delia into eccentric action that fateful day.
Takebe said, ''It is an eccentric action and unbelievable.
He plays eccentric action man Mike, but you probably won't recognise him when he hosts this new series.
22 rifle boasts new and innovative features including a Mauser-type claw extractor for controlled-round feeding, a two-position Model 70-type safety, and an eccentric action in which the bolt raceway is slightly above center in the receiver.
However, downhill running required extensive eccentric action, which resulted in considerable soreness.
After each eccentric action, the examiner removed the load, and the arm was returned passively to the start position.
Although most studies show smaller responses of RPE in eccentric action, the methodological differences and sample presented in the literature make critical and rigorous comparisons difficult.
Eccentric action of muscles: physiology, injury, and adaptation.
05) was also found was also found in the 60[degrees]/sec and in the 180[degrees]/sec of concentric and eccentric action of the knee flexors.
To examine the effects of the MPD on muscle recovery (fatigue and soreness), our laboratory conducted two independent studies involving different activities for inducing eccentric action muscle micro-trauma and assessing muscle recovery as measured by reduction in muscle fatigue and soreness.