the .gov means it’s official. the site is secure. viscoelastic stress relaxation refers to the decrease in tensile stress over time that occurs when a body under tensile stress is held at a fixed length.
the purpose of this study was to demonstrate viscoelastic stress relaxation in human skeletal muscle. the testing protocol involved a first stretch to the maximum tolerated rom with the lower extremity held at that point for 45 s (test 1). these 10 subjects (6 men, 4 women) underwent a second straight leg raise stretch (test 2) to a rom 5 degrees below the rom at which the onset of emg activity occurred in test 1. the stretch was held at this hip flexion angle for 45 s. there was a significant decrease in force at final rom during the 45 s in test 1 (11.35 +/- 1.75 n, p < 0.0001) and in test 2 (4.2 +/- 1.55 n, p < 0.05). in test 1 there was a significant decrease over time in iemg of 59.71 +/- 16.01 microv.s (p < 0.01) which was not significantly correlated to the decrease in force.
the reason for these differences among tissues is that tissues differ in their structural components (e.g., smooth muscle, collagen, elastin) and the arrangement of those components within the tissue. for example, the bladder, which is mostly smooth muscle, shows a high degree of stress relaxation while a tendon that is primarily composed of collagen shows virtually no stress relaxation. it is important that as the volume increases there is only a small increase in pressure, otherwise high pressures within the bladder would impede urine outflow from the kidneys and damage the kidneys.
the high compliance and high degree of stress relaxation in the bladder ensures that the pressure does not increase very much. understanding stress relaxation is important when the compliance of a tissue is being determined. if the pressure is measured before stress relaxation is complete, then the measured compliance would be lower than that measured in the steady-state. if the volume changes rapidly within a blood vessel (e.g., the aorta during cardiac systole and diastole), the measured compliance (change in volume divided by the change in pressure) will vary depending upon the rate of volume change.
viscoelastic stress relaxation refers to the decrease in tensile stress over time that occurs when a body under tensile stress is held at a fixed length. this decline in pressure (stress) over time at a constant volume (strain) is termed “stress relaxation.” the reason that pressure falls while the volume remains abstract. tension decay following stretch (stress relaxation) has been studied in resting long-fibred smooth and striated muscles. in both types of muscle, stress relaxation response smooth muscle, stress relaxation response smooth muscle, stress relaxation vs creep, stress relaxation mechanism, stress relaxation in blood vessels.
in one method of progressive muscle relaxation, you start by tensing and relaxing the muscles in your toes and progressively working your way up to your neck learn how to relieve stress and boost your mood with powerful relaxation techniques such as mindfulness meditation, deep breathing, visualization, and yoga. pdf | viscoelastic stress relaxation refers to the decrease in tensile stress over time that occurs when a body under tensile stress is held at a fixed., stress relaxation blood pressure, reverse stress relaxation, stress relaxation response anatomy, reverse stress-relaxation of the circulatory system, stress relaxation curve, stress relaxation experiment, stress relaxation rubber, examples of stress relaxation, stress relaxation testing, stress relaxation in metals.
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