Tatebayashi et al., "Preconditioning contractions prevent the delayed onset of myofibrillar dysfunction after damaging eccentric contractions
," Journal of Physiology, vol.
Unaccustomed exercise is associated with delayed-onset muscle soreness, particularly when involving eccentric contractions
.  Repetition of the same eccentric exercise reduces muscle damage known as the "repeated bout effect." A previous study has reported that a single familiarization session is sufficient to remove any muscle soreness for up to 6 months.
Specifically, increased quadriceps activity was observed during single-support phases for power absorption, signifying the presence of eccentric contractions
, while the relative duration of knee flexor activation was reduced compared with level walking .
Studies have shown that, out of these contractions, the greater ability to generate force is achieved by the eccentric contraction
, then by the isometric one and the least by the concentric one, while if we compare the effect to energy consumption, the best performance is achieved by the isometric contraction, followed by the eccentric one.
Second, our colleagues pointed out the scarcity of included studies which trained solely eccentric contractions
. This is true and we share this concern.
They concluded that when the break test is performed, the velocity applied through the lever arm to "break" the force and initiate an eccentric contraction
could lead to variable strength measurements.
In effective plyometric training, an eccentric contraction
is followed immediately by a concentric contraction to produce a powerful force.
We also recommend a brief pause (1 second) at the mid-range position, which enables a smooth transition between the concentric and eccentric contractions
They continue to make the same mistakes in the weight room, such as poor form, using too much weight, exercising too frequently, neglecting certain vital body parts, and - perhaps the greatest mistake of all - failing to emphasize eccentric contraction
After each eccentric contraction
, the examiner removed the load and the arm was returned to the starting position without load.
al, 1986), applied eccentric contraction
to the leg flexors to young and elderly women and determined their CK levels.
This triceps brachii concentric/eccentric contraction cycle was performed at a metronome-controlled tempo of one second per concentric contraction and one second per eccentric contraction
. The subjects were instructed to perform the concentric phase of each repetition as fast as they could by pushing the barbell to complete extension as rapidly and explosively as possible.