skeletal muscles are the type of muscle contraction that contributes most to the development of doms.
skeletal muscles are the type of muscle contraction that contributes most to the development of doms.
which type of muscle contraction contributes most to the development of doms?
skeletal muscles
muscle contractions can be described based on two variables: force and length. force itself can be differentiated as either tension or load. muscle tension is the force exerted by the muscle on an object whereas a load is the force exerted by an object on the muscle. when muscle tension changes without any corresponding changes in muscle length, the muscle contraction is described as isometric. if the muscle length changes while muscle tension remains the same, then the muscle contraction is isotonic. in an isotonic contraction, the muscle length can either shorten to produce a concentric contraction or lengthen to produce an eccentric contraction. in natural movements that underlie locomotor activity, muscle contractions are multifaceted as they are able to produce changes in length and tension in a time-varying manner. therefore, neither length nor tension is likely to remain constant when the muscle is active during locomotor activity.
muscle contraction
the muscle contraction of a ballistic muscle movement can exhibit a muscle coactivation of concurrent agonist and antagonist muscles or the characteristic triphasic agonist/antagonist/agonist muscle activation. electromyography (emg) recordings of demonstrate the triphasic muscle activation begins with a brief agonist motor unit activation signal with firing rates of 60 to 120 hz that may last for 100ms and occurs 50 to 100ms before movement begins. the firing rates of ballistic movements are much higher than that of slow ramp movements (5–15 hz). the brief agonist muscle contraction is thus followed by antagonist muscle unit activation. the degree of antagonist muscle unit activation is dependent on the task at hand unlike the first agonist muscle activation which is independent to environmental stimuli. the function of the antagonist muscle contraction is believed to control the amplitude and timing of ballistic movements. antagonist muscle contraction may serve to prevent injury to joints by preventing the limb from overextending itself and also function to control the distance and time the limb is being moved. experiments involving ballistic movement of small amplitudes show a marked increase in antagonist muscle activation and experiments where distance moved is not controlled antagonist muscle activation was decreased or absent. the second agonist muscle activation is suggested to terminate the negative acceleration of the antagonist muscle contraction and thus the ballistic movement.
ballistic movement