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Arm span or reach (sometimes referred to as wingspan, or spelled armspan) is the physical measurement of the length from one end of an individual's arms (measured at the fingertips) to the other when raised parallel to the ground at shoulder height at a 90° angle. The arm span measurement is usually very close to the person's height.
The ape index is usually defined as the ratio of arm span to height. However, an alternative approach is arm span minus height with the result being positive, 0 or negative. Unlike the dimensionless ratio, this calculation produces a numeric value in the units of measurement used to represent the height and arm span.
This is a list of units of measurement based on human body parts or the attributes and abilities of humans (anthropometric units). It does not include derived units further unless they are also themselves human-based.
In modern figure drawing, the basic unit of measurement is the 'head', which is the distance from the top of the head to the chin. This unit of measurement is credited [2] to the Greek sculptor Polykleitos (fifth century BCE) and has long been used by artists to establish the proportions of the human figure.
[3] [4] The measuring point is halfway between the olecranon process of the ulna and the acromion process of the scapula. [4] [5] [6] The mid-upper arm circumference is the circumference of the upper arm at that same midpoint, measured with a non-stretchable tape measure [2] [3] [4] [6] or 3D printable bands. [7]
Anthropometric measurements provide are very beneficial tools to the diagnostic process of genetic skeletal dysplasias. The anthropometric measurements include height, sitting height, arm span, upper/ lower-body segment ratio, sitting height/height ratio, and arm span/height ratio for age.
Ancient Greek texts show that the span was used as a fixed measure in ancient Greece since at least archaic period.The word spithame (Greek: "σπιθαμή"), "span", [4] is attested in the work of Herodotus [5] in the 5th century BC; however, the span was used in Greece long before that, since the word trispithamos (Greek: "τρισπίθαμος"), "three spans long", [6] occurs as early as ...
The body proportions of Vitruvian Man.The armspan is marked equal to the stature of the subject. Leonardo da Vinci developed rules for drawing human proportions. For example, human body height is to be the length of eight heads, with an additional one-quarter head for neck length.