WordNet

move with abrupt, seemingly uncontrolled motions; "The patients legs were jerkings" (同)twitch
(mechanics) the rate of change of acceleration
an abrupt spasmodic movement (同)jerking, jolt, saccade
raising a weight from shoulder height to above the head by straightening the arms
a dull stupid fatuous person (同)dork
throw or toss with a quick motion; "flick a piece of paper across the table"; "jerk his head" (同)flick
a gliding joint between the distal ends of the tibia and fibula and the proximal end of the talus (同)ankle_joint, mortise_joint, articulatio talocruralis

PrepTutorEJDIC

(急に)『ぐいっと引っぱる』(『押す』,『ねじる』,『投げる』)『こと』 / (筋肉の)反射運動;けいれん / 《米俗》うぶな人;まぬけ / (重量挙げの)ジャーク / 《運動を表す副詞[句]を伴って》…‘を'『急に引っぱる』(『押す』,『ねじる』,『投げる』) / …‘を'ぶっきらぼうに(投げ出すように)言う《+『out』+『名,』+『名』+『out』》 / 『急に』(『ぐいっと』)『動く』
〈特に牛肉〉‘を'細切りにして干し肉にする
『足首』,くるぶし

Wikipedia preview

出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2012/12/15 17:13:14」(JST)

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The ankle jerk reflex, also known as the Achilles reflex, occurs when the Achilles tendon is tapped while the foot is dorsi-flexed. A positive result would be the jerking of the foot towards its plantar surface.

The Achilles reflex checks if the S₁ and S₂^[1] nerve roots are intact and could be indicative of sciatic nerve pathology. It is classically delayed in hypothyroidism. This reflex is usually absent in disk herniations at the L₅—S₁ level.

A reduction in the ankle jerk reflex may also be indicative of peripheral neuropathy.

References

^ William J. Weiner (30 July 2010). Neurology for the Non-Neurologist. Lippincott Williams & Wilkins. pp. 499–. ISBN 978-1-60547-239-3. http://books.google.com/books?id=eQa9c3-roD8C&pg=PA499. Retrieved 4 July 2011.

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1. 成人における詳細な神経学的検査 the detailed neurologic examination in adults
2. 心因性不随意運動 psychogenic movement disorders
3. ミオクローヌスの分類および評価 classification and evaluation of myoclonus
4. 足首の捻挫 ankle sprain
5. 小児における足関節骨折 ankle fractures in children

English Journal

Intersegmental moment analysis characterizes the partial correspondence of jumping and jerking.

Cleather DJ, Goodwin JE, Bull AM.Source1School of Human Sciences, St. Mary's University College, Twickenham, United Kingdom 2Department of Bioengineering, Imperial College London, London, United Kingdom.
Journal of strength and conditioning research / National Strength & Conditioning Association.J Strength Cond Res.2013 Jan;27(1):89-100. doi: 10.1519/JSC.0b013e31825037ee.
ABSTRACT: Cleather, DJ, Goodwin, JE, and Bull, AMJ. Intersegmental moment analysis characterizes the partial correspondence of jumping and jerking. J Strength Cond Res 27(1): 89-100, 2013-The aim of this study was to quantify internal joint moments of the lower limb during vertical jumping and the w
PMID 22362089

The effects of disruption in attention on driving performance patterns: Analysis of jerk-cost function and vehicle control data.

Choi JS, Kim HS, Kang DW, Choi MH, Kim HS, Hong SP, Yu NR, Lim DW, Min BC, Tack GR, Chung SC.SourceDepartment of Biomedical Engineering, Research Institute of Biomedical Engineering, College of Biomedical & Health Science, Konkuk University, 322 Danwol-dong, Chungju-si, Chungcheongbuk-do 380-701, South Korea.
Applied ergonomics.Appl Ergon.2012 Dec 2. pii: S0003-6870(12)00181-0. doi: 10.1016/j.apergo.2012.11.004. [Epub ahead of print]
This study analyzes the effects of attention disruption factors, such as sending text messages (STM) and performing searching navigation (SN) on driving performance patterns while actively driving, centering on motion signals. To this end, it analyzes not only data on control of the vehicle includin
PMID 23217629

Parental mosaicism of a novel PMP22 mutation with a minimal neuropathic phenotype.

Taioli F, Bertolasi L, Ajena D, Ferrarini M, Cabrini I, Crestanello A, Fabrizi GM.SourceDepartment of Neurological, Neuropsychological, Morphological and Movement Sciences, Section of Neuropathology, University of Verona; Department of Neurosciences, AOUI.
Journal of the peripheral nervous system : JPNS.J Peripher Nerv Syst.2012 Dec;17(4):414-7. doi: 10.1111/j.1529-8027.2012.00441.x.
Genetic germinal and somatic mosaicisms of dominant Charcot-Marie-Tooth disease (CMT) mutations are rarely reported and/or recognized. We describe a novel heterozygous p.Trp39Cys missense mutation in the extracellular domain of the peripheral myelin protein 22 (PMP22) associated with an early-onset
PMID 23279344