jerk

(redirected from ankle jerk)
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Related to ankle jerk: Ankle jerk reflex

jerk

[jərk]
(mechanics)
The rate of change of acceleration; it is the third derivative of position with respect to time.
A unit of rate of change of acceleration, equal to 1 foot (30.48 centimeters) per second squared per second.
References in periodicals archive ?
Motor system examination revealed muscle power of 4/5 in all four limbs with predominant proximal muscle weakness, normal muscle tone with generalized hyporeflexia and delayed relaxation of ankle jerk.
Delayed relaxation of ankle jerk is the most common finding present which correlates well with the description in most standard textbooks of endocrinology.