What is the relationship between arm length and height

Some people are born with long legs and arms, which makes them look particularly slender and their overall proportions appear to be well-proportioned. No matter what style of clothes they wear, they look very beautiful. However, some people are curious about the relationship between arm length and height. In fact, a normal person's height is consistent with the length of their arms when they are outstretched. However, this is not necessarily the case for everyone. For example, people who are shorter or fatter may have the distance between their hands slightly smaller than their height. So what other relationships are there?

The length of a person's outstretched arms is approximately equal to his height.

Additional knowledge:

Some parts of the human body can be used as a ruler to estimate length:

(1) The length of a person's outstretched arms is approximately equal to his height; when a person stretches out his palm, the distance from the thumb to the tip of the middle finger is called "a big scissors", and the distance from the thumb to the tip of the index finger is called "a small scissors"; the length of an average step when a person walks; the width of a certain finger, etc. If you know your own length, step length, height, finger width, etc., you can use your arms, palms, steps, finger width, etc. to estimate the length of an object;

(2) Generally speaking, a person's head is as long as his feet; a person's height is 9.5 times the length of his head; and a person's fist is as big as his heart.

(3) Many parts of the human body are distributed according to the "golden ratio", for example, the eyes are the golden ratio point of the head, the navel is the golden ratio point of the human body, etc.

Measurement method

Direct method: The straight-line distance from the acromion point (a) to the radial styloid point (sty.r) is measured using a round rod straight-foot gauge.

Indirect method: The height of the right acromion minus the height of the right radial styloid process equals the total arm length [2].

Related concepts

(1) Total length of upper limb/upper limb length: the straight-line distance from the acromion point (a) to the tip of the middle finger (daⅢ) when the upper limb is naturally hanging.

Upper arm length: the straight-line distance from the acromion point (a) to the radius point (r).

Forearm length: the straight-line distance from the radial point (r) to the radial styloid point (sty.r).

Hand length: The straight-line distance from the midpoint of the palmar surface line connecting the radial styloid process (sty.r) and the ulnar styloid process (sty.u) (this point roughly corresponds to the midpoint of the flexion line of the wrist skin) to the tip of the middle finger (da III) [4].

(2) Total length of upper limb = total arm length + hand length; total arm length = upper arm length + forearm length[5].