Non-adenosine triphosphate-dependent mechanical rupture of actin-myosin cross-bridges could explain the lesser energy utilization in an eccentric contraction relative to concentric contraction
. Stretch on the muscle before contraction causes a widening of I-band in sarcomere; hence, actinmyosin cross-bridges cover a longer distance in an eccentric contraction resulting in greater force production as compared to the concentric contraction
When entering the mid-stance phase, the plantar flexors were transformed from eccentric contraction (doing negative work) into concentric contraction
(doing positive work) and pushed the body into the swing phase.
Significant differences between the dominant and non-dominant limbs during concentric contraction
at a velocity of 60 [degrees] -[s.sup.-1] in adult elite athletes (Q:Q= 10.53 [+ or - ] 9.44 %, H:H= 10.30 [+ or -] 5.69 %) were published by Jones & Bampouras (2010).
Triceps brachii concentric contraction
However, if the WRD group truly performed their sets to repetition maximum (RM) then the main consideration is simply that both groups trained to maximal effort; the ARD group performed 10 maximal concentric contractions
per set, and the WRD group performed 1 maximal concentric contraction
as the final repetition of each set.
As an example, for concentric contraction
of the dorsal flexors, have the patient place the ankle joint in a neutral position (foot at a 90 [degrees] angle to the leg).
* The claimant is blind, or so nearly blind as to have corrected visual acuity of 5/200 or less, in both eyes, or concentric contraction
of the visual field to five degrees or less
involves a shortening of the muscles under loading and is used to accelerate the body or move an object, as when you suddenly move in the opposite direction to hit the baseball.
The animals were randomly assigned to any of four groups according to the type of exercise selected: a) control non-exercised, b) uphill (predominantly concentric contraction
) inclination (+7[degrees]), c) downhill (predominantly eccentric contraction) inclination (-7[degrees]), d) control--horizontal motion, or no inclination.
* Concentric Movement--In a concentric contraction
the muscle shortens to produce movement.
Our general guideline for movement speed stipulates a 1-2 second concentric contraction
and a 3-4 second eccentric contraction.
In the same example, the opposite of an eccentric contraction is a concentric contraction
, which would be lifting the weight away from the chest.