DISSICTIC BIOTYPE (and non-displasic biotype) William Sheldon established c . 1940 three types of human biotypes according to their bone structure and fat retention capacity and muscle mass creation. endomorph or pchonic, ectomorphic or leptosomatic, mesomorphic or athletic. The dysplastic biotype is a fourth very heterogeneous secondary morphological type that is added today, and which is a mixture of traits of the three fundamentals, to which hereditary deformities and endocrine disorders of a very varied character are added.
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