Lab # Two : Anthropometry Lab # 2: Anthropometry April 21, 2017

Objective To understand the concept of Anthropometry. To gain practical experience in collecting and analysis anthropometric data. To know how to design Anthropometric products Lab 2 : Anthropometry 4/21/2017

Introduction Ergonomics is to design efficient and comfortable products. ( How?) Ergonomics is to make your body relax, your morale positive, and your mind focus. Human considerations are: a. Physiological b. Psychological c. Mental Lab 2 : Anthropometry 4/21/2017

Introduction (Cont.) To assess the fit between a person and their work, ergonomists consider The job being done and the demands on the worker. The equipment used (its size, shape, and how appropriate it is for the task). The information used (how it is presented, accessed, and changed). Ergonomics draws on many disciplines in its study of humans and their environments, including anthropometry, biomechanics, physiology, and psychology. Lab 2 : Anthropometry 4/21/2017

Anthropometry Human Measurements Lab 2 : Anthropometry 4/21/2017

Anthropometry The science of designing suitable outcomes for the maximum envelope of people with taking into account the distribution of relevant body measurements. The science of design optimization Lab # 2: Anthropometry April 21, 2017

Anthropometry Anthropometry is the science of measurement and study of the human body and its parts and capacities. Is the branch of ergonomics that deals with body shape and size. The science of measuring the human body in order to ascertain the average dimensions of the human form at different ages, and in different divisions of race, class etc. Lab 2 : Anthropometry 4/21/2017

Anthropometry Ethnic Origin Nutritional Beliefs Gender Age Food Availability Lab # 2: Anthropometry April 21, 2017

Anthropometry Step by Step Decide who you are designing for (user population). Decide which body measurements are relevant Decide whether you are designing for the 'average‘, “extremes”, or for Adjustable Range Think about other human factors Lab 2 : Anthropometry 4/21/2017

Step # 1: User Population (Who?) First of all you need to answer the 1st question: “Who are the users???” to design an office chair, you would need to consider dimensions for adults of working age and not those for children or the elderly. To design a product for the home, such as a kettle, your user group would include everyone except young children (hopefully!). To design alarm system, user group would include adults, children, and wheelchair users, etc Lab 2 : Anthropometry 4/21/2017

Step # 2: Body Measurements (For What?) You need to know which parts of the body are relevant to your design. For example, if you were designing a mobile phone, you would need to consider the width and length of the hand, the size of the fingers, as well as grip diameter. Wouldn't be too interested in the height or weight of the user (although the weight of the phone might be important! Why????) Lab 2 : Anthropometry 4/21/2017

Step # 3: Average or Extreme? Nobody is 'average' in all body dimensions. Someone might be say, of average height but have a longer than average hand length. The variation in the size and shape of people also tells us that if you design to suit yourself, it will only be suitable for people who are the same size and shape as you, and you might 'design out' everyone else! Lab 2 : Anthropometry 4/21/2017

Measurements Distribution According to the factors mentioned above, the measurement of the humans’ body dimensions are inherently varied. There is no exemplary (ideal) design, why?? All we can do is to strike the balance by designing for optimum envelope of people ( optimum design). Design for (50th percentile) Design for extremes Design for adjustable range Lab 2 : Anthropometry 4/21/2017

Percentiles (Cont.) Lab 2 : Anthropometry 4/21/2017 First, notice that the graph is symmetrical – so that 50% of people are of average height or taller, and 50% are of average height or smaller. The graph tails off to either end, because fewer people are extremely tall or very short. To the left of the average, there is a point known as the 5th percentile, because 5% of the people (or 1 person in 20) is shorter than this particular height. The same distance to the right is a point known as the 95th percentile, where only 1 person in 20 is taller than this height. Lab 2 : Anthropometry 4/21/2017

Designing a door height For example, if we were designing a doorway using the height, shoulder width, hip width etc., of an average person, then half the people using the doorway would be taller than the average, and half would be wider. Since the tallest people are not necessarily the widest, more than half the users would have to bend down or turn sideways to get through the doorway. Therefore, in this case we would need to design using dimensions of the widest and tallest people to ensure that everyone could walk through normally. (Extremes) Lab 2 : Anthropometry 4/21/2017

Designing a door height (Cont.) Usually, you will find that if you pick the right percentile, 95% of people will be able to use your design. For example, if you were choosing a door height, you would choose the dimension of people's height (often called 'stature' in anthropometry tables) and pick the 95th percentile value – in other words, you would design for the taller people. You wouldn't need to worry about the average height people, or the 5th percentile ones – they would be able to fit through the door anyway Lab 2 : Anthropometry 4/21/2017

Designing an Airplane Cockpit At the other end of the scale, if you were designing an airplane cockpit, and needed to make sure everyone could reach a particular control. You would choose 5th percentile arm length – because the people with the short arms are the ones who are most challenging to design for. If they could reach the control, everyone else (with longer arms) would be able to. Lab 2 : Anthropometry 4/21/2017

Deciding whether to use the 5th, 50th or 95th percentile value depends on what you are designing and who you are designing it for. Lab 2 : Anthropometry 4/21/2017

Step # 4: Other Human Factors (+, -) You may need to add corrections for clothing. Have you allowed for shoe heights? You generally add 20mm for fairly flat shoes, and more if you think users will be wearing high heels. If your product is to be used somewhere cold, can it still be used if someone is wearing gloves or other bulky clothing? Lab 2 : Anthropometry 4/21/2017

Body Measurements Static Dimensions Dynamic Dimensions Taken when the body is fixed (static) position. Skeletal dimensions (between the center of joints, such as between elbow and the wrist) or of contour dimensions and surface dimensions such as head circumference. Dynamic Dimensions Taken under conditions in which the body is engaged some physical activity. In most physical activities (where one is operating steering wheel, assembling a mousetrap, or reaching across the table for the salt). Lab 2 : Anthropometry 4/21/2017

Body Mass Index (BMI) It is a statistical measurement which compares a person's weight and height. It does not actually measure the percentage of body fat, it is a useful tool to estimate a healthy body weight based on how tall a person is. Lab 2 : Anthropometry 4/21/2017

Body Mass Index (Cont.) It is easy in measurement and calculation, so it is the most widely used diagnostic tool to identify weight problem within a population including: Underweight. Overweight. Obesity. Lab 2 : Anthropometry 4/21/2017

BMI Formula Body mass index is defined as the individual's body weight divided by the square of his height. Lab 2 : Anthropometry 4/21/2017

BMI Interpretation Category BMI range - kg/m2 Severely underweight less than 16.5 Underweight from 16.5 to 18.5 Normal from 18.5 to 25 Overweight from 25 to 30 Obese Class I from 30 to 35 Obese Class II from 35 to 40 Obese Class III over 40 Lab 2 : Anthropometry 4/21/2017

Body Dimensions (Static) Symbol Expression A Stature B Elbow Height C Hip Height D Knuckle Height E Chest/Bust Depth Lab 2 : Anthropometry 4/21/2017

Body Dimensions (Dynamic) Symbol Expression F Sitting Height G Sitting Elbow Height H Shoulder-Elbow Length I Shoulder-Grip Length J Elbow-Fingertip Length K Hand Length L Buttock-Knee Length M Buttock-Popliteal Length N Popliteal Height O Knee Height P Foot Length Lab 2 : Anthropometry 4/21/2017

Body Dimensions Q Shoulder Breadth R Hip Breadth Symbol Expression Lab 2 : Anthropometry 4/21/2017