biology

Pignet Index

Pignet Index 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 Pignet Index rather than just read about it. In short: Pignet Index or Body Build Index is an index used for evaluation of body build. It was suggested in 1901 by Maurice–Charles–Joseph Pignet, who was a French army doctor.

Key takeaways

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

Reference excerpt

Pignet Index or Body Build Index is an index used for evaluation of body build. It was suggested in 1901 by Maurice–Charles–Joseph Pignet, who was a French army doctor. Pignet Index is expressed by formula:

Stature in cm - (weight in kg + chest circumference in cm)

Body build according to this index is noted as:

Very sturdy: <10 Sturdy: 10-15 Good: 16-20 Average: 21-25 Weak: 26-30 Very weak: 31-35 Poor: >36

References

Worked examples

Example 1 — a first encounter with Pignet Index

Start with the simplest possible case. Write down what Pignet Index 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 Pignet Index 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 Pignet Index 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 Pignet Index

In research: Pignet Index 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 Pignet Index 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: Pignet Index is common in secondary-school and first-year university syllabi. It links to neighbouring topics Anthropometry, Biological anthropology, Classification of obesity, so understanding it makes those chapters shorter.
In everyday life: Look for Pignet Index 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 Pignet Index in 20 minutes

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

Frequently asked questions

What is Pignet Index in simple terms?

Pignet Index or Body Build Index is an index used for evaluation of body build. It was suggested in 1901 by Maurice–Charles–Joseph Pignet, who was a French army doctor.

Why does Pignet Index 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 Pignet Index?

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 Pignet Index.