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.
Consequently he is a regular in their directors' box at home matches which is how he spurred Delia into eccentric action that fateful day.
30 /PRNewswire/ -- Eidos Interactive, one of the world's leading publishers and developers of entertainment software, today confirms MONSTER LAB, an eccentric action and role playing game (RPG) for Wii(TM) and Nintendo DS(TM)
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.
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.
Thereby, we designed the present study to compare the maximal strength and EMG in response to prolonged vibration stimulation during maximal eccentric action and maximal concentric action for evaluation of the alpha motor neuron activity.
The time under tension for each eccentric action was the same for the KE and the EF.
An 85kg man performed both normal speed (3 sec eccentric action and maximal acceleration concentric action) and PS back squats over a several loads.
Children may be hesitant as the sensation of eccentric actions is novel and unique, as are the strategies employed by the nervous system to produce an eccentric action of maximum effort (Enoka, 1996).
Linnamo V, Moritani T, Nicol C, Komi PV (2003) Motor unit activation patterns during isometric, concentric and eccentric actions at different force levels.