science

Tonic vibration reflex

Tonic vibration reflex is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Tonic vibration reflex rather than just read about it. In short: Tonic vibration reflex is a sustained contraction of a muscle subjected to vibration. This reflex is caused by vibratory activation of muscle spindles — muscle receptors sensitive to stretch.

Key takeaways

Tonic vibration reflex belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Tonic vibration reflex to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Tonic vibration reflex from memory before moving on to harder problems.

Reference excerpt

Tonic vibration reflex is a sustained contraction of a muscle subjected to vibration. This reflex is caused by vibratory activation of muscle spindles — muscle receptors sensitive to stretch. Tonic vibration reflex is evoked by placing a vibrator — which in this case is typically an electrical motor with an eccentric load on its shaft — on a muscle's tendon. 30–100 Hz vibration activates receptors of the skin, tendons and, most importantly, muscle spindles. Muscle spindle discharges are sent to the spinal cord through afferent nerve fibers, where they activate polysynaptic reflex arcs, causing the muscle to contract. The effects of sustained vibratory stimulation on muscle contraction, posture and kinesthetic perceptions are much more complex than merely contraction of the muscle being vibrated. Russian scientists Victor Gurfinkel, Mikhail Lebedev, Andrew Polyakov and Yuri Levick used vibratory stimulation to study human posture control and spectral characteristics of electromyographic (EMG) activity.

See also Tendon reflex H-reflex

References Gurfinkel, V.S., Lebedev, M.A., Levick, Yu. S. (1992). "What about the so-called neck reflexes in humans?". In Bertoz, A., Graf, W., Vidal, P.P. (ed.). The Head-Neck Sensory Motor System. Oxford University Press. pp. 543–7. doi:10.1093/acprof:oso/9780195068207.003.0086. ISBN 9780195068207.{{cite book}}: CS1 maint: multiple names: authors list (link) Gurfinkel' VS; Lebedev MA; Levik IuS (1992). "[Switching effect in the system of equilibrium regulation in man]". Neirofiziologiia (in Russian). 24 (4): 462–70. PMID 1436211. English Translation Gurfinkel', V. S.; Lebedev, M. A.; Levik, Yu. S. (1993). "Effects of reversal in the human equilibrium regulation system". Neurophysiology. 24 (4): 297–304. doi:10.1007/BF01057332. S2CID 46510709. Lebedev MA, Polyakov AV (1992). "Analysis of surface EMG of human soleus muscle subjected to vibration". J Electromyogr Kinesiol. 2 (1): 26–35. doi:10.1016/1050-6411(92)90005-4. PMID 20870524. Gurfinkel, V.S., Levick, Yu. S. Lebedev, M.A. (1991). "Body scheme concept and motor control. Body scheme in the postural automatisms regulation". Intellectual Processes and Their Modelling. Moscow: Nauka. pp. 24–53.{{cite book}}: CS1 maint: multiple names: authors list (link) Lebedev MA, Poliakov AV (1991). "[Analysis of the interference electromyogram of human soleus muscle after exposure to vibration]". Neirofiziologiia (in Russian). 23 (1): 57–65. PMID 2034299. English Translation Lebedev, M. A.; Polyakov, A. V. (1991). "Analysis of the interference electromyogram of the human soleus muscle under vibrational stimulation". Neurophysiology. 23: 47–54. doi:10.1007/BF01052289. S2CID 19403562.

Worked examples

Example 1 — a first encounter with Tonic vibration reflex

Start with the simplest possible case. Write down what Tonic vibration reflex claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Tonic vibration reflex before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Tonic vibration reflex ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Tonic vibration reflex

In research: Tonic vibration reflex appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Tonic vibration reflex in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Tonic vibration reflex is common in secondary-school and first-year university syllabi. It links to neighbouring topics Reflexes, so understanding it makes those chapters shorter.
In everyday life: Look for Tonic vibration reflex outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Tonic vibration reflex in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Tonic vibration reflex means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Tonic vibration reflex out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Tonic vibration reflex in simple terms?

Tonic vibration reflex is a sustained contraction of a muscle subjected to vibration. This reflex is caused by vibratory activation of muscle spindles — muscle receptors sensitive to stretch.

Why does Tonic vibration reflex matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Tonic vibration reflex?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Tonic vibration reflex.