WordNet

vary the pitch of ones speech (同)inflect, modulate
give a healthy elasticity to; "Lets tone our muscles" (同)tone up, strengthen
change the color or tone of; "tone a negative"
change to a color image; "tone a photographic image"
(linguistics) a pitch or change in pitch of the voice that serves to distinguish words in tonal languages; "the Beijing dialect uses four tones"
a steady sound without overtones; "they tested his hearing with pure tones of different frequencies" (同)pure tone
the quality of a persons voice; "he began in a conversational tone"; "he spoke in a nervous tone of voice" (同)tone of voice
a musical interval of two semitones (同)whole tone, step, whole step
the quality of something (an act or a piece of writing) that reveals the attitudes and presuppositions of the author; "the general tone of articles appearing in the newspapers is that the government should withdraw"; "from the tone of her behavior I gathe
utter monotonously and repetitively and rhythmically; "The students chanted the same slogan over and over again" (同)chant, intone
make ones way by force; "He muscled his way into the office"
animal tissue consisting predominantly of contractile cells (同)muscular_tissue
one of the contractile organs of the body (同)musculus
authority or power or force (especially when used in a coercive way); "the senators used their muscle to get the party leader to resign"
having or distinguished by a tone; often used in combination; "full-toned"; "silver-toned"
having or characterized or distinguished by tone or a specific tone; often used in combination; "full-toned"; "shrill-toned"; "deep-toned"

PrepTutorEJDIC

〈C〉(高さ・音色・長さ・音量の点から見た)『音』 / 〈C〉〈U〉音質 / 〈C〉楽音;全音程 / 〈C〉《しばしば複数形で》『言い方,書き方』,口調,語調 / 〈C〉支配的な(一般的な)風潮(傾向) / 〈U〉(筋肉などの緊張の)『正常な状態』 / 〈C〉『色調』,色合い,濃淡,明暗 / (音・色などで)…‘に'『ある調子(口調,色合い)をつける』 / …‘の'色を変える,色を補正する
《方向》(1)(到着の意を含めて)…『へ』,に,まで / 《状況の変化》…[のほう]へ;…に[なるまで],その結果…になる / 《適用範囲》(1)《動詞に伴って》『…に対して』,に,へ / (2)《形容詞[句]・[代]名倍に伴って》『…に対して』 / 《程度・範囲》『…[に至る]まで』 / 《時間の終り》『…まで』(till) / 《to one's+『名』の形で》(…が)『…したことに[は]』 / 《比較・対比・割合》『…と比べて』,より,に対して / 《一致・適合》『…に合わせて』,に合って,に応じて / 《目的・意図》『…のために』 / 《運命・境遇》『…に』 / 《所属・関係》『…へ』,に[対して] / 《付加・付着・固執》『…に』 / 《対立・対向》…に[対して] / いつもの状態(位置)に / 停止(閉鎖)の状態に / 活動状態に(へ),仕事に
《名詞的用法》『…すること』 / 《形容詞的用法》『…するための,すべき』 / 《副詞的用法》『…するために』,して,するとは,すれば / 《独立用法》 / 《文全体を修飾する慣用語句》…すれば,してみると,…だが / 短縮文
〈U〉(動物体の組織としての)『筋肉』,筋(きん);〈C〉(体の各部を動かす)筋肉 / 〈U〉力,(特に)筋力,腕力 / 《俗に》(…に)強引に割り込む《+『in on』(『into, through』)+『名』》
(重量単位の)『トン』 / (容積単位の)トン(物によって異なり,木材では40立方フィート,小麦では20立方フィート) / 《話》大量(の…),多数(の…)《+of+名》

Wikipedia preview

出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2015/08/09 20:10:51」(JST)

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In physiology, medicine, and anatomy, muscle tone (residual muscle tension or tonus) is the continuous and passive part contraction of the muscles, or the muscle's resistance to passive stretch during resting state.^[1] It helps to maintain posture and declines during REM sleep^{[citation needed]}.

Purpose

If a sudden pull or stretch occurs, the body responds by automatically increasing the muscle's tension, a reflex which helps guard against danger as well as helping to maintain balance. Such near-continuous innervation can be thought of as a "default" or "steady state" condition for muscles. There is, for the most part, no actual "rest state" insofar as activation is concerned. Both the extensor and flexor muscles are involved in the maintenance of a constant tone while "at rest." In skeletal muscles, this helps maintain a normal posture.

Although cardiac muscle and smooth muscle are not directly connected to the skeleton, they also have tonus in the sense that although their contractions are not matched with those of antagonist muscles, the non-contractile state is characterized by (sometimes random) enervation.

Pathological tonus

Physical disorders can result in abnormally low (hypotonia) or high (hypertonia) muscle tone. Another form of hypertonia is paratonia, which is associated with dementia. Hypotonia is seen in lower motor neuron disease like poliomyelitis. Hypotonia can present clinically as muscle flaccidity, where the limbs appear floppy, stretch reflex responses are decreased, and the limb's resistance to passive movement is also decreased.^[1] Hypertonia is seen in upper motor neuron diseases like lesions in pyramidal tract and extrapyramidal tract. Hypertonia can present clinically as either spasticity or rigidity. While spasticity is velocity-dependent resistance to passive stretch (i.e. passively moving an elbow quickly will elicit increased muscle tone, but passively moving elbow slowly may not elicit increased muscle tone), rigidity is velocity-independent resistance to passive stretch (i.e. there is uniform increased tone whether the elbow is passively moved quickly or slowly).^[1] Spasticity can be in the form of the clasp-knife response, in which there is increased resistance only at the beginning or at the end of the movement. Rigidity can be of the leadpipe type, in which there is resistance throughout to passive movement, or it may be of cogwheel type, in which the resistance to passive movement is in a jerky manner.

Tonus in surgery

In ophthalmology, tonus may be a central consideration in eye surgery, as in the manipulation of extraocular muscles to repair strabismus. Tonicity aberrations are associated with many diseases of the eye (e.g. Adie syndrome).

References

^ ^a ^b ^c O’Sullivan, S. B. (2007). Examination of motor function: Motor control and motor learning. In S. B. O’Sullivan, & T. J. Schmitz (Eds), Physical rehabilitation (5th ed.) (pp. 233-234). Philadelphia, Pennsylvania: F. A. Davis Company.

External links

BBC series on muscles

UpToDate Contents

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1. 筋力低下の評価における筋力検査 muscle examination in the evaluation of weakness
2. 筋緊張低下および脱力を呈する幼児に対するアプローチ approach to the infant with hypotonia and weakness
3. 新生児の神経学的検査 neurologic examination of the newborn
4. 幼児および小児における精密な神経学的評価 detailed neurologic assessment of infants and children
5. 小児における身体的診察：背部、四肢、神経系、皮膚、およびリンパ節 the pediatric physical examination back extremities nervous system skin and lymph nodes

English Journal

Investigation of neurogenic excitatory and inhibitory motor responses and their control by 5-HT(4) receptors in circular smooth muscle of pig descending colon.

Priem EK, Lefebvre RA.AbstractThe aim of this study was to investigate whether the pig colon descendens might be a good model for the responses mediated via the different locations of human colonic 5-HT(4) receptors. The intrinsic excitatory and inhibitory motor neurotransmission in pig colon descendens was therefore first characterized. In circular smooth muscle strips, electrical field stimulation (EFS) at basal tone induced only in the combined presence of the NO synthase inhibitor N(ω)-nitro-L-arginine methyl ester hydrochloride (L-NAME) and the SK channel blocker apamin voltage-dependent on-contractions. These on-contractions were largely reduced by the neuronal conductance blocker tetrodotoxin (TTX) and by the muscarinic receptor antagonist atropine, illustrating activation of cholinergic neurons. The 5-HT(4) receptor agonist prucalopride facilitated submaximal EFS-evoked cholinergic contractions and this effect was prevented by the 5-HT(4) receptor antagonist GR113808, supporting the presence of facilitating 5-HT(4) receptors on the cholinergic nerve endings innervating circular muscle in pig colon descendens. Relaxations were induced by EFS in strips pre-contracted with substance P in the presence of atropine. The responses at lower stimulation voltages were abolished by TTX. L-NAME or apamin alone did not influence or only moderately reduced the relaxations, but L-NAME plus apamin abolished the relaxations at lower stimulation voltages, suggesting that NO and ATP act as inhibitory neurotransmitters in a redundant way. Prucalopride did not influence the EFS-induced relaxations at lower stimulation voltage, nor did it per se relax contracted circular muscle strips. No evidence for relaxing 5-HT(4) receptors, either on inhibitory neurons or on the muscle cells was thus obtained in pig colon descendens circular muscle.
European journal of pharmacology.Eur J Pharmacol.2011 Sep 30;667(1-3):365-74. Epub 2011 Jun 26.
The aim of this study was to investigate whether the pig colon descendens might be a good model for the responses mediated via the different locations of human colonic 5-HT(4) receptors. The intrinsic excitatory and inhibitory motor neurotransmission in pig colon descendens was therefore first chara
PMID 21723862

Adventitia-Derived Hydrogen Peroxide Impairs Relaxation of the Rat Carotid Artery via Smooth Muscle Cell p38 Mitogen-Activated Protein Kinase.

Cascino T, Csanyi G, Al Ghouleh I, Montezano AC, Touyz RM, Haurani MJ, Pagano PJ.Source1 Hypertension and Vascular Research Division, Henry Ford Health System , Detroit, Michigan.
Antioxidants & redox signaling.Antioxid Redox Signal.2011 Sep 15;15(6):1507-15. Epub 2011 Apr 8.
Abstract The role of adventitia-derived reactive oxygen species (ROS) in vascular disease and impaired vascular relaxation is not clear. Based on robust adventitial ROS generation and effects on MAPK involvement in vascular dysfunction, we hypothesized that adventitia-derived ROS hydrogen peroxide (
PMID 21126185

Japanese Journal

Muscle tone changes in the lower limbs of stroke patients induced by trunk stabilization exercises

Rhee Min-Hyung,Kim Laurentius Jongsoon
Journal of Physical Therapy Science 27(8), 2663-2664, 2015
… [Conclusion] Trunk stabilization exercises help control the muscle tone in stroke patients. …
NAID 130005093930

Upper extremity muscle tone and response of tidal volume during manually assisted breathing for patients requiring prolonged mechanical ventilation

Morino Akira,Shida Masahiro,Tanaka Masashi,Sato Kimihiro,Seko Toshiaki,Ito Shunsuke,Ogawa Shunichi,Yokoi Yuka,Takahashi Naoaki
Journal of Physical Therapy Science 27(8), 2509-2513, 2015
… [Purpose] The aim of the present study was to examine, in patients requiring prolonged mechanical ventilation, if the response of tidal volume during manually assisted breathing is dependent upon both upper extremity muscle tone and the pressure intensity of manually assisted breathing. …
NAID 130005093905

Predictive factors of hypertonia in the upper extremity of chronic stroke survivors

Lee GyuChang,An SeungHeon,Lee YunBok,Lee DongGeon,Park Dong-sik
Journal of Physical Therapy Science 27(8), 2545-2549, 2015
… [Purpose] Muscle tone is known to predict the motor function of the upper extremity within 12 months after onset in stroke survivors. … [Subjects and Methods] Forty-three chronic stroke survivors were assessed using the Modified Ashworth Scale (MAS) for elbow flexor tone, the Fugl-Meyer assessment of the upper extremity (FM-UE), and the Action Research Arm Test (ARAT) for upper extremity motor recovery and function. …
NAID 130005093902