elastic recoil


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recoil

 [re-koyl´]
1. to pull back quickly, such as towards a resting position upon removal of a strong opposing force.
2. (re´koil) a pulling back quickly.
elastic recoil the ability of a stretched elastic object or organ, such as the lung or bladder, to return to its resting position. See also elastance.

elastic recoil

The inherent resistance of a tissue to changes in shape, and the tendency of tissue to revert to its original shape once deformed. A sensitive indicator of elastic recoil (ER) is the coefficient of retraction—the ratio of the maximal static recoil pressure to total lung capacity. ER is the effective pressure driving maximal expiratory airflow, and is increased after lung-reduction surgery for severe emphysema. The ER of lungs is directed centripetally and the lungs have a tendency to deflate, while the ER of the chest wall is directed centrifugally, favouring an increase in lung volume; the sum of the opposing ER of the lungs and the chest wall generates a subatmospheric pressure of -5 cm H2O.

elastic recoil

Physiology The inherent resistance of a tissue to changes in shape, and the tendency of the tissue to revert to its original shape once deformed; a sensitive indicator of ER is the coefficient of retraction; ER is the effective pressure driving maximal expiratory air flow, and is ↑ after lung-reduction surgery for severe emphysema. See Coefficient of retraction, Elastance, Lung-reduction surgery. Cf Compliance.
References in periodicals archive ?
The higher tension levels (T3 and T4) would never be utilised during normal training or testing scenarios, however, for the purposes of identifying the biomechanical effect of elastic recoil force, it was necessary to include these in the current protocol.
The effects of loading on bone, then, can be described as a continuum of displacement.[1] First, force inflicts temporary deformation that can be reversed by elastic recoil. Then, as force surpasses the upper limits of bone elasticity (the "yield point"), permanent deformation results.
Unlike bone, however, soft tissues experience a range of deformation that is "viscous." That is, elastic recoil does not instantaneously return tissues to their original shape when force is reduced, but neither are they permanently deformed.
The decline of pulmonary function is more associated with structural: A decrease in the static elastic recoil of the lung, a decrease in compliance of the chest wall, and a decrease in the strength of respiratory muscles.
On the basis of behavioral and histological observations, it appears that arm flexure results from the contraction of large flexor muscles, and that recovery results from the elastic recoil of ligaments.
Vital capacity is determined by the lung dimensions, compliance and respiratory muscle power whereas PEFR is determined mainly by airway caliber, alveolar elastic recoil and respiratory muscle effort.
The difference between the two curves can be explained by the elastic recoil phenomenon.
Again, cigarette smoking can result in the destruction of alveolar septae, causing lung tissue to experience decreased elastic recoil. Consequently, the compliance of the lungs increases and the lung elastance decreases.
There is a loss of elastic recoil of the lung during short-term exposure to altitude, and this may explain the increase in RV.
The apneustic center stimulates the ventral respiratory group and dorsal respiratory group (VRG and DRC) to inhale, while the pneumotaxic center switches off inspiration and, working with transpulmonary pressure and elastic recoil, facilitates passive exhalation.
The VisoV can't distinguish between airway obstruction as found in asthma or bronchitis versus the obstruction caused in loss of elastic recoil found with emphysema.
This new aerosol delivery device stores the aerosol that is generated during the patient's exhalation phase in a non-latex elastic reservoir bag, and releases it to the patient on the subsequent breath, with a slight boost from the elastic recoil of the expanded bag, along with the other aerosol that the nebulizer is generating.