Sitting postures dimensions are important in designing, mainly while we are designing chair. Proper dimension of furniture according to the human dimension will reduce ergonomics risk.
Sitting Postures
Sitting Height
The subject sits erect, look straight ahead with his knees and ankles forming right angles. Sitting height is the vertical distance from sitting surface to the top of the head.
| Importance | Critical |
| Sitting height is important for designing backrest of chair. | If backrest of your chair is not according to the sitting height than to use that chair is not comfortable for user. |
Eye Height
This is the distance between the sitting surface and the inner corner of the eye.
| Importance | Critical |
| Sitting height is important for TV height in house, blackboard for study room or in school, soft board, etc. | If TV height is not according to the eye height of human than person will not feel comfortable while watching TV in sitting posture. |
Shoulder Height
This is the vertical distance between the sitting surface to the uppermost point on the lateral edge of the shoulder while subject sitting erect.
| Importance | Critical |
| Sitting height is important for designing backrest of chair. | If backrest of your chair is not according to the sitting height than to use that chair is not comfortable for user. |
Elbow Height
| Importance | Critical |
| Elbow height is important for designing a height of arm rest in chair & table (study table, Dining table, etc). | If height of arm rest is not according to the elbow height, it will give pain to the user’s hand. |
The distance between sitting surface to the bottom of right elbow is known as elbow height while subject sits erect with part of shoulder to elbow vertical at his side and his forearm at a right angle to the upper arm.
Knee Height
This is the vertical distance from floor to uppermost point of the knee while subject sits erect with knee and ankles at right angles
| Importance | Critical |
| Knee height is important for designing a sitting height of the chair. | If sitting height of chair is not according to the knee height, than your legs will hang without any support & will pain in your legs. |
Thigh Height
This is the vertical distance from the floor to the top of the thigh while subject sits with his knees and ankles at right angles.
Buttock Knee Length
Horizontal distance from the posterior point of the buttocks to the anterior point on the knee is known as buttock knee length while the subject sits erect with his knees and ankles at right angles.
Buttock Popliteal Length
This is the horizontal distance from the plane of the most posterior point on the buttocks to the back of the knee. The subject sits straight with his knees and ankles at right angles.
| Importance | Critical |
| Buttock to popliteal length is important for designing depth of the chair. | If depth of the chair is not according to this, user will not feel comfortable. |
Popliteal Height
The vertical distance from floor to the underside of the thigh immediately behind knee while subject sits erect with his knees and ankles at right angles and bottom of his thighs and the back of his knees barely touching the sitting surface is known as the buttock politeal length.
| Importance | Critical |
| Popliteal height is important for designing chair & WC sitting height, bed height, stool height, etc. | If the height of WC pan is not according to the popliteal height than person will not feel comfortable while using it. |
Buttock Leg Length
This is the horizontal distance from the outer surface of buttocks to the base of the heel while subject sits erect with his legs as forward as possible on a horizontal surface
| Importance | Critical |
| Buttock length is important for designing a Indian sitting, gym area, yoga space, etc. in house. | Width of Indian sitting should be according to the buttock leg length to make it user friendly. |
Hip Breadth
This is the maximum horizontal distance between hips. The subject sits erect with his knees and ankles right at angles and his knees and heels together.
| Importance | Critical |
| Hip breadth is important to design a breadth of chair. | Person will not feel comfortable if the breadth of chair sitting is not according to the hip breadth. |
Shoulder to Shoulder Breadth
Maximum horizontal distance across the external surface of biceps muscles is known as shoulder to shoulder breadth. The subjects sits erect with his upper arms touching his sides and his forearms extended horizontally.
| Importance | Critical |
| Shoulder to shoulder breadth is important to design a width of back rest of chair. | If breadth of backrest of rocking chair is not according to the shoulder to shoulder breadth than user will not feel free while using it. |
Elbow to Elbow Breadth
The maximum horizontal distance across the outer surface of the elbows while subject sits erect with part of shoulder to elbow vertical and touching his sides and his forearms extended horizontally.
| Importance | Critical |
| Elbow to elbow breadth is important for designing a distance between arm rests in chair. | Distance between arm rests in any chair should be according to the elbow to elbow breadth for make it user friendly. |
Fore Arm Hand Length
The subject sits erect with his upper arm vertical at his side and his forearm, hand and fingers extended horizontally. The horizontal distance from the tip of the right elbow to the tip of middle finger.
| Importance | Critical |
| Fore arm hand length is important for designing width of study table, working table, dining table, etc. | If the distance between chair & table is not according to the fore arm hand length than person will not feel comfortable while working, writing or eating. |
