biology

Woltman sign

Woltman sign is a biology 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 Woltman sign rather than just read about it. In short: Woltman's sign (also called Woltman's sign of hypothyroidism or, in older references, myxedema reflex) is a delayed relaxation phase of an elicited deep tendon reflex, usually tested in the Achilles tendon of the patient. Woltman's sign is named for Henry Woltman, an American neurologist.

Key takeaways

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

Reference excerpt

Woltman's sign (also called Woltman's sign of hypothyroidism or, in older references, myxedema reflex) is a delayed relaxation phase of an elicited deep tendon reflex, usually tested in the Achilles tendon of the patient. Woltman's sign is named for Henry Woltman, an American neurologist.

Associated conditions The delayed ankle jerks are associated with:

hypothyroidism; Huntington's disease; several neurological symptoms; anorexia nervosa; extreme old age; beta-blockers or other drugs; and/or hypothermia.

History In 1924, William Calvert Chaney (1888–1965), who worked under Henry Woltman at the Mayo Clinic, seems to have been the first to publish a description of the sign, but Woltman had no authorship and was not mentioned in Chaney's manuscript. The eponym "Woltman's sign of myxedema" was first published in 1956 at the time of Woltman's retirement.

References

Worked examples

Example 1 — a first encounter with Woltman sign

Start with the simplest possible case. Write down what Woltman sign claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, 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 Woltman sign 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 Woltman sign 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 Woltman sign

In research: Woltman sign appears in biology 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 Woltman sign 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: Woltman sign is common in secondary-school and first-year university syllabi. It links to neighbouring topics Endocrine, nutritional and metabolic disease stubs, Medical signs, Symptoms and signs: Endocrinology, nutrition, and metabolism, so understanding it makes those chapters shorter.
In everyday life: Look for Woltman sign 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 Woltman sign in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Woltman sign 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 Woltman sign out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Woltman sign in simple terms?

Why does Woltman sign matter?

Because it connects several biology 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 Woltman sign?

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 Woltman sign.