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Home/Anthropology/Mains PYQ/2015/Paper I/Human Genetics & Human Biology
UPSC MainsAnthropology Optional Paper I 2015 20 Marks Model Answer Available

Anthropometric Somatotype and the Heath-Carter Method — 2015 Paper I

Question · 2015 · Paper I · 20 Marks

What is an anthropometric somatotype ? Describe Heath and Carter's method of somatotyping.

Model Answer

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Approach

  • Demand of Question: Define anthropometric somatotype and explain systematically how the Heath-Carter method quantifies endomorphy, mesomorphy and ectomorphy.
  • Structuring the Response: Introduce somatotype, list required anthropometric measurements, explain calculation of the three components, and indicate interpretation and applications.
  • Key Dimensions to Cover: Sheldon, Heath-Carter, endomorphy, mesomorphy, ectomorphy, skinfolds, bone breadths, corrected girths, height-weight ratio and somatochart.

Model Answer

Introduction: A somatotype is a quantitative description of an individual's physique in terms of relative expression of endomorphy, mesomorphy and ectomorphy. While W.H. Sheldon originally developed a photographic method, Barbara Heath and J.E.L. Carter refined it into an objective anthropometric somatotyping method based on body measurements.

A somatotype is expressed as three numbers, for example:

3–5–2

where:

  • first number = Endomorphy
  • second = Mesomorphy
  • third = Ectomorphy

The three components

  1. Endomorphy

Represents relative adiposity or fatness.

A high endomorphic score indicates:

  • greater subcutaneous fat;
  • rounded body contours;
  • greater relative fat accumulation.
  1. Mesomorphy

Represents relative musculoskeletal robustness.

A high mesomorphic score indicates:

  • greater muscle development;
  • larger bone breadths;
  • greater muscular girths.
  1. Ectomorphy

Represents relative linearity or slenderness.

A high ectomorphic score indicates:

  • long, slender body;
  • low body mass relative to stature.

Thus:

Endomorphy = Fatness
Mesomorphy = Musculoskeletal development
Ectomorphy = Linearity

Heath-Carter Anthropometric Method

The method requires standardized measurements of:

  • stature;
  • body weight;
  • triceps skinfold;
  • subscapular skinfold;
  • supraspinale skinfold;
  • medial calf skinfold;
  • biepicondylar breadth of humerus;
  • biepicondylar breadth of femur;
  • flexed upper-arm girth;
  • maximum calf girth.
  1. Calculation of Endomorphy

Endomorphy is derived principally from the sum of three skinfolds:

Triceps + Subscapular + Supraspinale

The sum is corrected for stature.

Let:

X = Sum of 3 skinfolds × (170.18 / Height in cm)

Then endomorphy is calculated through the Heath-Carter polynomial:

Endomorphy = −0.7182 + 0.1451X − 0.00068X² + 0.0000014X³

Hence greater skinfold thickness produces a higher endomorphic rating.

  1. Calculation of Mesomorphy

Mesomorphy is estimated from:

  • humerus breadth;
  • femur breadth;
  • corrected arm girth;
  • corrected calf girth;
  • stature.

Corrected girths subtract the contribution of subcutaneous fat.

For example:

Corrected arm girth = Arm girth − (Triceps skinfold / 10)

Similarly:

Corrected calf girth = Calf girth − (Calf skinfold / 10)

The standard equation is:

Mesomorphy = 0.858(Humerus breadth) + 0.601(Femur breadth) + 0.188(Corrected arm girth) + 0.161(Corrected calf girth) − 0.131(Height) + 4.5

Higher bone breadths and muscular girths increase mesomorphy.

III. Calculation of Ectomorphy

Ectomorphy is calculated using the Height-Weight Ratio (HWR):

HWR = Height in cm / ∛Weight in kg

Depending upon the HWR, different formulae are applied.

For higher HWR values:

Ectomorphy = 0.732(HWR) − 28.58

Thus:

Greater stature relative to body mass → Greater ectomorphy

Very low HWR values receive minimal ectomorphic scores.

Somatotype representation

After calculation, the three components are written in order:

Endomorphy – Mesomorphy – Ectomorphy

Examples:

  • 6–2–1 → Endomorphic physique
  • 2–6–2 → Mesomorphic physique
  • 1–2–6 → Ectomorphic physique
  • 3–4–3 → Relatively balanced physique

The result may also be plotted on a somatochart to compare individuals or populations.

Advantages of Heath-Carter method

It is:

  • objective;
  • quantitative;
  • inexpensive;
  • repeatable;
  • suitable for field studies;
  • useful for longitudinal comparisons.

Applications

Anthropometric somatotyping is used in:

  • sports anthropology;
  • growth studies;
  • nutritional assessment;
  • physical fitness research;
  • population comparison.

Different sports often show characteristic somatotype tendencies; for example, strength-power athletes commonly show relatively greater mesomorphy than endurance athletes.

Limitation

Somatotype describes current physique, not an immutable constitutional type. It can change with:

  • growth;
  • training;
  • nutrition;
  • ageing.

Conclusion

The Heath-Carter method transformed somatotyping from Sheldon's largely visual classification into a standardized anthropometric procedure. By quantifying fatness, musculoskeletal development and linearity, it provides a valuable tool for studying human physique, growth and athletic performance.

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