In this blog post, we’ll explore the key areas of ergonomics as applied in everyday life and industrial settings, look at real-world examples of its application, and examine why ergonomics makes our lives safer and more convenient.

What Is Ergonomics?

From the home appliances and furniture we use at home to the large machines installed in factories, countless products are not designed with functionality alone in mind. They are designed so that users can use them comfortably and without physical strain, and the discipline that forms the foundation of this design is ergonomics (Human Engineering).
Simply put, ergonomics is the study of humans through scientific and engineering methods. Its goal is to make people’s lives safer and more convenient by investigating and analyzing human physical capabilities and limitations, as well as psychological characteristics and cognitive limitations, and then incorporating these findings into the design of products, living environments, and work environments.

The Four Major Fields of Ergonomics

The Korean Society of Ergonomics classifies ergonomics into four major fields. Although each field differs in its research subjects and areas of application, they work together in a complementary manner to achieve human-centered design.
First, Physical Ergonomics is, as the name suggests, the field that studies the human body. It analyzes body proportions, joint ranges of motion, and muscle fatigue characteristics to determine how to minimize injuries and fatigue when people work or move. The findings from this research are widely applied to the design of various products, including industrial equipment and tools, as well as chairs, desks, and household goods.
Second, cognitive ergonomics is the field of designing products and systems by considering users’ cognitive and psychological characteristics. Representative examples include home appliances that are easy to use without reading a separate manual, self-service kiosks that anyone can use without making mistakes, and user interfaces (UIs) designed to make even new smartphones intuitive to use. In particular, in environments where even a small mistake can lead to a major accident—such as construction sites, transportation systems, nuclear power plants, and chemical plants—cognitive ergonomics serves as a key factor in enhancing safety.
Third, affective ergonomics is the field that quantitatively analyzes users’ emotions and incorporates these findings into product design. To this end, survey and statistical analysis techniques, as well as psychophysiological measurement methods, are utilized. Psychophysiological measurement is a method of analyzing a user’s emotional state by measuring physiological responses—such as heart rate, skin conductance (sweating), and eye movements—that occur in response to emotional changes. The data collected in this way is used to enhance user satisfaction and the emotional appeal of a product.
Finally, Macro Ergonomics is a field that studies the impact of organizational and social systems on individual psychology and behavior. It analyzes, from an ergonomic perspective, how organizational structures and work systems affect people—both positively and negatively—with the goal of designing healthier and more efficient organizational and social systems.

Practical Applications of Ergonomics: A Case Study of Chair Design

To understand how ergonomics is applied in actual product design, let’s take the example of a chair for workers who sit while working.
Sitting has the advantage of reducing strain on the feet and lowering overall energy expenditure. However, since “comfort” varies greatly from person to person, it is difficult to define it by a single standard. Therefore, a chair designed to allow users to freely adopt various postures can provide a higher level of comfort to a wider range of users.
When a person stands upright, the lumbar spine (lower back) naturally curves inward in a state known as lordosis. However, when sitting, the pelvis tilts backward, causing the lumbar spine to straighten, which increases the pressure on the discs between the vertebrae. Therefore, it is important to include lumbar support that helps maintain the natural curve of the lower back.

Simply positioning the lumbar support slightly above the hips can significantly reduce the strain on the lower back.
Another method is to tilt the seat slightly forward to widen the angle between the upper body and the thighs. This helps reduce the backward rotation of the pelvis, thereby alleviating the strain on the lower back. However, since this can increase the strain on the knees, saddle-shaped seats are sometimes used to compensate for this. This design effectively supports the lower back while reducing strain on the knees, and is actually being utilized in the development of saddle-style seats and various ergonomic support products.

An Application of Emotional Engineering: Automotive Design

While ergonomics focuses on physical comfort, emotional engineering deals with the feelings and images a product conveys to the user. The automotive industry is one of the leading fields where emotional engineering is most actively applied.
The proportions of the body and the size and shape of the driver’s side window significantly influence the formation of emotional images, such as the dynamism or sense of stability characteristic of a sports car.
Furthermore, tuning the engine sound to emphasize a high-performance image, designing the exhaust system to reduce noise and provide a quiet and comfortable feel, and meticulously designing the tactile feel and placement of the fuel filler cap and various control buttons are also outcomes of affective engineering. When these various elements come together in harmony, consumers are left with emotional impressions such as “sophisticated,” “luxurious,” and “reassuring” when they look at a car.

The Value and Appeal of Ergonomics

Ergonomics is, at its core, a discipline that studies the relationship between humans and engineering. It explores how humans—complex and ever-changing beings—can live in harmony with a rapidly evolving industrial society. The process of linking the scientific knowledge provided by engineering with human psychological and physiological characteristics to create practical products and systems is a highly fascinating and valuable field.
While the pace of human evolution is very slow, the pace of technological and product development is extremely fast. Human factors engineering plays a crucial role in bridging this gap. The core of human factors engineering lies not merely in creating products with superior functionality, but in designing products and environments that allow people to live more safely, comfortably, and with greater psychological satisfaction. This is precisely why human factors engineering is becoming increasingly important across various industries and in everyday life today, and it is also the primary reason so many people find this field so appealing.