Formation factors and clinical significance
The morphological appearance of a patient is not formed by chance. The development of a particular constitutional type is based on heredity, which acts as the main determining factor. However, the final picture is also modified by the influence of additional conditions: the person's lifestyle and social environment.
In clinical practice, the assessment of habitus has prognostic value. It is important to understand that the identified constitutional type is not an independent diagnosis. Nevertheless, it serves as a reliable indicator pointing to an increased probability of developing specific diseases in the future.
Asthenic type
Patients with an asthenic body build are characterized by a specific overall geometry: longitudinal body dimensions visually and instrumentally prevail over transverse ones.
Morphological picture:
- Head and neck: The skull is elongated vertically, the neck appears long and thin.
- Musculoskeletal system: Limbs are elongated and thin, the muscular framework is poorly developed.
- Chest: Has a narrow, flat, and elongated shape. The ribs point sharply downward, and the scapulae noticeably protrude from the back (so-called "winged" scapulae).
- Infrasternal angle: Acute (less than 90°).
Physiology and risks: Asthenics exhibit an accelerated metabolism and a tendency toward decreased blood pressure (arterial hypotension). This constitutional type is associated with an increased risk of developing tuberculosis, as well as peptic ulcer disease of the stomach and duodenum.
Hypersthenic type
Hypersthenics represent the exact opposite of asthenics. Their overall geometry is characterized by the dominance of transverse dimensions over longitudinal ones.
Morphological picture:
- Head and neck: The face is wide, the neck is shortened and rather thick.
- Chest: Wide, massive. The ribs are located almost in a horizontal plane.
- Infrasternal angle: Obtuse (exceeding 90°).
Physiology and risks: Individuals with a hypersthenic body build often show a tendency toward metabolic disorders. Consequently, they are predisposed to pathologies associated with metabolic shifts: formation of calculi (kidney and gallstones), obesity, atherosclerotic vascular lesions, and arterial hypertension.
Normosthenic type
The normosthenic body build is considered the most balanced. It is characterized by a proportional, harmonious ratio of all main body dimensions.
Patients of this type are distinguished by a correct, anatomically flawless structure of the musculoskeletal system. Upon examination of a normosthenic's chest, the infrasternal angle is straight (approximately 90°).
To remember chest geometry: An asthenic resembles the letter "A" (acute infrasternal angle, stretching upward). A hypersthenic is visually "expanded" in width, the angle is obtuse.
Class and exam questions
Can a diagnosis be made based solely on body build?
No. The constitution is merely a risk factor and indicates a predisposition to certain pathological processes, but it does not replace a clinical diagnosis.
What infrasternal angle is considered normal for a normosthenic?
In normosthenics, the epigastric angle is straight and equals approximately 90 degrees.
What diseases are typical for asthenics?
The asthenic type predisposes to tuberculosis, peptic ulcer disease of the stomach and duodenum, as well as arterial hypotension.
What else to study on this topic
- Method of measuring the infrasternal angle
- Assessment of muscle development during general examination
- Relationship between constitutional type and blood pressure indicators
- Examination of chest shape (pathological and physiological variants)
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