IB Syllabus focus: 'Anthropometry measures body segments and proportions. Anthropometric databases inform equipment design and sizing, while ergonomic design can improve efficiency during performance.'
Anthropometry and ergonomics help explain why equipment fits some athletes better than others. In sport, good design links body size and shape to comfort, control, and efficient movement.
Anthropometry and what it measures
Anthropometry is the systematic measurement of the human body for size, shape, and proportions.
Anthropometry: The systematic measurement of human body size, segments, and proportions.
In IB SEHS, the key focus is how body measurements relate to movement and to the design or selection of equipment. Common anthropometric measures include stature, sitting height, arm span, limb length, shoulder breadth, hand size, and foot dimensions. These measurements describe both total body size and the relationship between body parts, such as the ratio between leg length and torso length.
Practice Questions
FAQ
3D scanning captures body shape as well as simple linear measurements. That can be useful when contour, symmetry, or surface contact matters, such as for helmets, cycling positions, or custom seating systems.
It also speeds up data collection and can support more personalized fitting. However, scanned data still need careful interpretation, since a detailed image is not automatically the same as a good ergonomic design.
During a growth spurt, limb lengths and proportions can change quickly. Equipment that fit well a few months earlier may suddenly become too short, too narrow, or poorly balanced for the athlete.
This means youth equipment often needs more frequent review than adult equipment. Coaches and athletes should look for signs such as sudden discomfort, changes in posture, or difficulty repeating technique that was previously stable.
A short fitting session may not reproduce the effects of fatigue, sweat, repeated impact, or high-speed movement. Equipment that feels acceptable at rest may shift, rub, or restrict technique once the athlete is performing at full intensity.
Competition conditions can also change the interaction with equipment. Clothing layers, weather, and stress can all alter how securely or comfortably the equipment works.
Custom equipment is more useful when the athlete has unusual body proportions, a very specialized technique, or a performance need that standard sizes cannot meet well. Elite sport can sometimes justify this because small gains may matter.
Standard adjustable equipment is usually preferred when cost, flexibility, and ease of replacement are more important. It can also be better for developing athletes whose bodies or techniques are still changing.
Protective layers increase the space between the body and the equipment. That can alter grip size, helmet fit, strap tension, shoe volume, or how easily the athlete senses contact with the equipment.
Because of this, fitting should ideally be done in the same clothing or protective setup used in performance. Otherwise, equipment may be correctly sized for the body alone but not for the body as it is actually used in sport.
