Rheobase

rheobase

[′rē·ō‚bās] (physiology) The intensity of the steady current just sufficient to excite a tissue when suddenly applied.

Rheobase

the minimum potential of direct electric current necessary to produce excitation in living tissues. The concept was introduced into physiology in 1909 by L. Lapicque, who in studies on the minimum threshold of excitable tissues determined the dependence between the intensity of a current and the duration of the action of a current.

The rheobase, like the chronaxy, gives an idea of tissue and organ excitability from the threshold of the intensity and duration of stimulation. It corresponds to the stimulation threshold and is expressed in volts or milliamperes. Its value can be computed from the formula i = a/t + b, where i is the current potential, t is the duration of the action of a current, and a and b are constants determined by the properties of a tissue. The constant b is the rheobase because with prolonged stimulation by a current, the a/t ratio will be very low and i will be virtually equal to b. The rheobase often refers to the threshold values of other stimuli besides those that are electric.

rheobase

[re´o-bās] the minimal electric current of infinite duration necessary to produce a twitch in a muscle. In a strength-duration curve for muscle stimulation, it is the voltage at which there is no further decrease in threshold when the pulse width or duration is increased.

rhe·o·base

(rē'ō-bās), The minimal strength of an electrical stimulus of indefinite duration that is able to cause excitation of a tissue, for example, muscle or nerve.
See also: chronaxie. Synonym(s): galvanic threshold [rheo- + G. basis, a base]

rheobase

(rē′ō-bās′)n. The minimal strength of an electrical stimulus that is able to cause excitation of a tissue, such as a muscle.

rhe′o·ba′sic adj.

rhe·o·base

(rē'ō-bās) The minimal strength of an electrical stimulus of indefinite duration that is able to cause excitation of a tissue, e.g., muscle or nerve.
See also: chronaxie[rheo- + G. basis, a base]

单词	rheobase
释义	rheobase rheobase (ˈriːəʊˌbeɪs) n (Physiology) physiol the minimum nerve impulse required to elicit a response from a tissue Rheobase rheobase [′rē·ō‚bās] (physiology) The intensity of the steady current just sufficient to excite a tissue when suddenly applied. Rheobase the minimum potential of direct electric current necessary to produce excitation in living tissues. The concept was introduced into physiology in 1909 by L. Lapicque, who in studies on the minimum threshold of excitable tissues determined the dependence between the intensity of a current and the duration of the action of a current. The rheobase, like the chronaxy, gives an idea of tissue and organ excitability from the threshold of the intensity and duration of stimulation. It corresponds to the stimulation threshold and is expressed in volts or milliamperes. Its value can be computed from the formula i = a/t + b, where i is the current potential, t is the duration of the action of a current, and a and b are constants determined by the properties of a tissue. The constant b is the rheobase because with prolonged stimulation by a current, the a/t ratio will be very low and i will be virtually equal to b. The rheobase often refers to the threshold values of other stimuli besides those that are electric. rheobase rheobase [re´o-bās] the minimal electric current of infinite duration necessary to produce a twitch in a muscle. In a strength-duration curve for muscle stimulation, it is the voltage at which there is no further decrease in threshold when the pulse width or duration is increased. rhe·o·base (rē'ō-bās), The minimal strength of an electrical stimulus of indefinite duration that is able to cause excitation of a tissue, for example, muscle or nerve. See also: chronaxie. Synonym(s): galvanic threshold [rheo- + G. basis, a base] rheobase (rē′ō-bās′)n. The minimal strength of an electrical stimulus that is able to cause excitation of a tissue, such as a muscle. rhe′o·ba′sic adj. rhe·o·base (rē'ō-bās) The minimal strength of an electrical stimulus of indefinite duration that is able to cause excitation of a tissue, e.g., muscle or nerve. See also: chronaxie[rheo- + G. basis, a base]
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