refractory period


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period

 [pēr´e-od]
an interval or division of time; the time for the regular recurrence of a phenomenon.
absolute refractory period the part of the refractory period from phase 0 to approximately −60 mV during phase 3; during this time it is impossible for the myocardium to respond with a propagated action potential, even with a strong stimulus. Called also effective refractory period.
blanking period a period of time during and after a pacemaker stimulus when the unstimulated chamber is insensitive to avoid sensing the electronic event in the stimulated chamber.
effective refractory period absolute refractory period.
ejection period the second phase of ventricular systole (0.21 to 0.30 sec), between the opening and closing of the semilunar valves, while the blood is discharged into the aorta and pulmonary artery. Called also sphygmic period.
gestation period see gestation period.
incubation period see incubation period.
isoelectric period the moment in muscular contraction when no deflection of the galvanometer is produced.
latency period
latent period a seemingly inactive period, as that between exposure to an infection and the onset of illness (incubation period) or that between the instant of stimulation and the beginning of response (latency, def. 2).
refractory period the period of depolarization and repolarization of the cell membrane after excitation; during the first portion (absolute refractory period), the nerve or muscle fiber cannot respond to a second stimulus, whereas during the relative refractory period it can respond only to a strong stimulus.
relative refractory period the part of the refractory period from approximately −60 mV during phase 3 to the end of phase 3; during this time a depressed response to a strong stimulus is possible.
safe period the period during the menstrual cycle when conception is considered least likely to occur; it comprises approximately the ten days after menstruation begins and the ten days preceding menstruation. See the section on fertility awareness methods, under contraception.
sphygmic period ejection period.
supernormal period in electrocardiography, a period at the end of phase 3 of the action potential during which activation can be initiated with a milder stimulus than is required at maximal repolarization, because at this time the cell is excitable and closer to threshold than at maximal diastolic potential.
vulnerable period that time at the peak of the T wave during which serious arrhythmias are likely to result if a stimulus occurs.
Wenckebach's period a usually repetitive sequence seen in partial heart block, marked by progressive lengthening of the P–R interval; see also dropped beat.

re·frac·to·ry pe·ri·od

1. the period following effective stimulation, during which excitable tissue such as heart muscle and nerve fails to respond to a stimulus of threshold intensity (that is, excitability is depressed);
2. a period of temporary psychophysiologic resistance to further sexual stimulation that occurs immediately following orgasm.

refractory period

A component of the resolution phase, the fourth and final phase of Masters and Johnson’s four-stage model of physiological responses to sexual stimulation, which follows the orgasmic phase. During the refractory period, it is typically physiologically impossible for males to have additional orgasms: the male is sexually satiated physically, and the penis is flaccid and unerectable. Further stimulation of the now hypersensitive penis may even be painful. As further orgasm may be achieved by females following the first, they typically do not have a refractory period.

refractory period

Cardiac pacing The time during which a pacemaker's sensing mechanism is nonresponsive–in full or in part to cardiac activity–eg, to a retrograde P-wave in a DDD pacemaker. See Pacemaker Sexuality A post-orgasm recovery period lasting from mins to hrs during which the penis is unerectable. See Erection.

re·frac·to·ry pe·ri·od

(rĕ-frak'tŏr-ē pēr'ē-ŏd)
1. The time following effective stimulation, during which excitable tissue such as heart muscle and nerve fails to respond to a stimulus of threshold intensity (i.e., excitability is depressed).
2. A period of temporary psychophysiologic resistance to further sexual stimulation, which occurs immediately following orgasm.

refractory period

The period immediately following the passage of a nerve impulse or the contraction of a muscle fibre during which a stimulus, normally capable of promoting a response, has no effect.

refractory period

the period of inexcitability, that normally lasts about three milliseconds, during which the AXON recovers after it has transmitted an impulse. During the refractory period it is impossible for the axon to transmit another impulse, because the membrane is being repolarized by ionic movements at this time. During the absolute refractory period no NERVE IMPULSE can be transmitted, but during the relative refractory period an impulse can be transmitted providing the stimulus is strong.

re·frac·to·ry pe·ri·od

(rē-frak'tŏr-ē pēr'ē-ŏd)
Duration following effective stimulation, during which excitable tissue fails to respond to a stimulus.
References in periodicals archive ?
Task switching and response correspondence in the psychological refractory period paradigm.
Conversely, taking into account only the females that remated, the analysis on female sexual refractory period (number of days between 1 mating and the next) revealed that whereas male irradiation did not affect the refractory period ([chi square] = 0.01, df = 1, P = 0.92, N = 754), there was an effect of the male previous sexual experience ([chi square] = 7.75, df = 2, P = 0.02).
(11) Accordingly, in Model F, a reduced refractory period was both expected and observed, and ultimately reflected faster re-solution time in response to increased local absolute pressure.
Neuron n integrates weighted input spikes during the accepting period [A.sub.nk] for the kth firing, and after the refractory period ends, it decides whether the integrated value exceeds zero for firing at every time point.
The release of prolactin is thought to be largely responsible for the post-orgasmic refractory period seen in men (Kruger et al., 2003b) and elevated prolactin in the blood can be considered as a regulatory mechanism, or feedback loop, that helps control sexual libido and, therefore, sexual behaviour (Exton et al., 2000; Kruger et al., 2003b; Kruger, Hartmann, & Schedlowski, 2005).
basline) ERP=Effective refractory period. HRA and LAA indicate high right atria and left atria appendage.
The reproductive variables measured were, apart from male and female body weight, spermatophylax and ampulla weights for males, and duration of the refractory period, egg weight, and number and mass of eggs laid during the refractory period for females.
The results of this study showed that in DM group inter-atrial conduction time (IACT), atrial effective refractory period (AERP) and inducibility of AF were increased and LA interstitial fibrosis was evident and may constitute a substrate for the development of AF.
After a man climaxes he goes into a refractory period during which he can't get aroused.
"There is some thought about there being a refractory period after an anaphylactic reaction, particularly a more severe one, where the patient might not be at risk," commented Dr.
As a result of increased duration of the action potential and refractory period, patients with hypokalemia are at increased risk for certain dysrhythmias like ventricular tachycardia.
For a while, mainly depending on his age and health, he won't be able to achieve another erection for some time - the so-called refractory period - and therefore his interest in sex lessens.

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