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Measurement of the ratio of arm span to height

The ape index is a measurement of the ratio of an individual's arm span relative to their height. It is often used in sports and physical assessments to evaluate an individual's reach and potential advantages in activities such as climbing, swimming, and basketball.

Definition

The ape index is calculated by subtracting a person's height from their arm span. A positive ape index indicates that the arm span is greater than the height, while a negative ape index indicates that the height is greater than the arm span. An ape index of zero means that the arm span and height are equal.

Calculation

To calculate the ape index, measure the arm span from fingertip to fingertip with arms fully extended horizontally. Then, measure the height of the individual. The formula is:

Ape Index = Arm Span _ Height

Alternatively, the ape index can be expressed as a ratio:

Ape Index Ratio = Arm Span / Height

A ratio greater than 1 indicates a positive ape index, while a ratio less than 1 indicates a negative ape index.

Applications

The ape index is particularly relevant in sports where reach is advantageous. For example:

• In rock climbing, a higher ape index can help climbers reach holds that are further apart.
• In swimming, a longer arm span can contribute to a more powerful stroke.
• In basketball, a greater reach can aid in shooting, blocking, and rebounding.

Historical Context

The concept of the ape index is related to the study of human proportions, which dates back to the work of Leonardo da Vinci and his famous drawing, the Vitruvian Man. This drawing illustrates the ideal human body proportions, including the relationship between arm span and height.

Gallery

• 
  The Vitruvian Man by Leonardo da Vinci, illustrating human proportions.

Related pages

• Human body ratio
• Anthropometry
• Vitruvian Man

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