Till recently even in the western industrialised world, the sitting furniture’s consisted mainly of chairs or benches with solid seat surface. Just a few decades ago, the upholstered sitting furniture like the arm chair, sofa and couch were uncommon household furniture’s.

Just a few decades ago in most parts of the developing world, the sitting furniture consisted of the simple seat with three or four legs and no back or arm rest. Till recently in most parts of the world, the sofa, couch, armchair and even the chair fitted with backrest was a commodity that just a small percentage of the population was able to afford.

Already for a few centuries, the majority of the world population where using chairs with a wooden seat and wooden bench, and in the last few decades huge changes happened.

Not so long ago, even in the industrialized world, the upholstered furniture was affordable only to rich people. Nowadays, due to the advance in technology, production and economic prosperity, it is available to a great percentage of the world population.

Nowadays, everywhere in the world the economic prosperity is followed by replacing the traditional style of sitting furniture with the modern style of sitting furniture. The traditional style of sitting furniture, mostly wooden chair and wooden bench is replaced with a chair with an upholstered seat surface, and a new style of sitting furniture like sofa, arm chair and couch was brought in the homes.

Production technology that made most of today’s upholstered sitting furniture is different from the manufacturing technology that was used just a few decades ago.

Just a few decades ago all upholstered sitting furniture was made using spring systems. Expensive sitting furniture was made using eight-way hand-tied springs that offer a firmer seat.
Less expensive sitting furniture was made using sinuous springs that offers a softer seat.

Nowadays, seats of less costly sitting furniture aren’t made with spring systems but they are only stuffed or padded with soft fuelling, mostly with polyurethane foam. Instead of spring systems that are still used by expensive sitting furniture, the upholstery of the cheap sitting furniture consists of high density polyuretane foams wraped in fabrics that provide far softer seats compared with the sitting furniture that is made by using the spring system.

Nowadays, only the expensive sitting furniture is made using spring systems and is mostly affordable to the more affluent population. Less costly chair, sofa, couch and armchair is upholstered by using polyurethane foam that provides a far softer seat is mostly affordable to the less affluent population.

Till recently, the big percentage of chairs were made without back support and nowadays, almost every chair is made with back support and that alone alters the way how muscles are engaged in the task of supporting the upper body weight in sitting position.

Nowadays, it is less and less common for chairs to have a firm surface of the seat and most chairs are having soft upholstered seat.

Not only are households replacing the old style sitting furniture with the less costly version of modern sitting furniture, but in public places like schools, universities, restaurants, etc, chairs with a firm seat surface are replaced with the less costly version of sitting furniture with a soft upholstered seat.

In recent decades, the food and life style didn’t change too much compared to change of the sitting furniture’s. The change of the sitting furniture changes the biomechanics of sitting. A few decades ago most overweight people were part of the rich population. On the other side, a few decades ago only the rich population could afford upholstered sitting furniture. But still, the morbid obesity was unknown, and one reason for that is that the seats of the upholstered sitting furniture were far less soft compared to today’s cheap version of upholstered sitting furniture.

Nowadays, the expensive upholstered furniture is made by using the same technology as it was used a few decades ago.

Nowadays, the prevalence of obesity among the affluent population is not much different than what was a few decades ago. – One reason for that is that they still use sitting furniture that is manufactured using the same system that was used a few decades ago.

Nowadays, the most obese, particularly the morbid obese people are mostly found among the less affluent population. – One reason for that is because they mostly use the less costly modern sitting furniture.

In times where sitting furniture was made mainly from wood without upholstering and mostly without back support, at the same time by the poor and the middle class population, obesity was unknown. At those times, the problem among the less affluent population was mostly being underweight and not overweight, and obesity or morbid obesity was unknown.

A few decades ago, there emerged a new technology of producing upholstered sitting furniture using polyurethane foam. On the other side, a few decades ago there emerged the problem of obesity in such proportions and severity that was unknown to any previous generation.

Modern less costly sitting furniture is the main factor that has caused the less affluent population to be affected with overweight and obesity to a far greater extent than among rich population.

In places in the world where sitting furniture with firm surface of the seat is still used, there is still no problem of overweight and obesity and there are still far less incidences of certain types of diseases, that in an epidemical proportion affect the industrialized world.

Modern upholstered sitting furniture, particularly a cheap version of the upholstered sitting furniture like upholstered chair, armchair, sofa and couch are the main contributing factors for increased prevalence of overweight and obesity throughout the world.

It is known that overweight and obese parents are more likely to have overweight and obese children. The Main reason for that is that parents and children use the same sitting furniture.

In households where the sitting furniture is equipped with firm seat and without arms or back rest, there are no obese parents and no obese children.

The parallel between the widespread of modern upholstered sitting furniture and the widespread of obesity is very strong.

Among pets like cats and dogs, the obesity was unknown till recent decades. The widespread use of thick soft carpet on the floor affect gait patterns of the household pets combined with the widespread of upholstered sitting furniture is responsible for incidences of obesity by pets.
Humans’ use the chair, sofa, couch and arm chairs for sitting and the pets are sitting on the soft seat of the sitting furniture but also on the carpet. In the house without upholstered sitting furniture where the ground consists of the wooden floor without soft carpet, there are no obese pets.


Biomechanics and Weight Loss – B/W Edition

Biomechanics and Weight Loss – Colour Edition


Copyright © 2008 Luka Tunjic All right reserved


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