Healthy Work Research: Sitting Positions Explained for Maximum Comfort

In today's fast-paced world, many of us spend entire days working at a desk, and prolonged sitting seems unavoidable. Survey data shows that 84% of people experience lower back pain at some point in their lives, while 25% experience knee pain—and such pain is affecting ever-younger people. Although pain can be related to many factors, such as viral infections, the potential health risks posed by poor posture are clear. So how should you sit for maximum comfort? What is the correct sitting posture for the office? To answer these questions, the Yihang–Nanjing Forestry University Healthy Work Research Center carried out further experimental research.

First, what are the most common sitting postures at the workstation?

We classified the office sitting postures observed in our field surveys according to the relationship between the body and the furniture (chair and desk), excluding postures involving leaning sideways or twisting, and arrived at:

Six common sitting postures

A – Forward-leaning posture with no lumbar support. B – Forward-leaning posture with lumbar support from the backrest. C – Upright posture, sitting toward the front of the seat, with no lumbar support. D – Upright posture, sitting centered, with no lumbar support. E – Reclined posture with lumbar support from the backrest. F – Semi-reclined posture with lumbar support from the backrest.

Among the employees surveyed, the proportions of workstation work behaviors (including getting up to move around, standing, and so on) that used the forward-leaning, upright, and reclined postures were:

Influenced by user preference, forward-leaning postures were used more often overall, yet the survey found that some people use reclined postures over the long term.

So, is there a posture among these that makes people less prone to fatigue?

It turns out that sitting bolt upright is not the "correct" posture after all—a slightly reclined posture is the most comfortable.

When you hear "Sit up straight!", what is your first reaction? Do you instinctively shuffle forward on the chair and stiffen your back? "Keep your back straight" seems like the simplest and most correct posture command. But have you noticed how hard it is to keep up—and that the longer you sit, the more tired you feel?

By measuring how long subjects could stay in a given posture, or how long it took before they began to feel discomfort, and combining this with research on muscle fatigue and dynamic body pressure, we identified the posture that causes the least fatigue.

(1) Subjective evaluation of overall sitting comfort

The comparison results are as follows:

Sitting comfort: E>F>A>B>C>D; Sense of relaxation: F>E>A>B=C>D; Feeling of fatigue: D>C>B>A>E>F.

(2) Instrument-based research on muscle fatigue

Using instruments such as a body pressure distribution measurement system and a surface electromyography device, we measured how different office sitting postures affect muscle fatigue. Based on the results of these two objective measurement methods, we can draw the following conclusion: reclined posture > forward-leaning posture > upright posture. Postures in which the body is supported remain comfortable for far longer than unsupported ones and are less likely to cause fatigue.

At work, holding your back perfectly straight for long periods is simply unsustainable—and it is not the best posture anyway. Prolonged sitting itself runs against human nature; the better posture is always a dynamic one, not a static one.

Finally, we recommend choosing an adjustable ergonomic chair. Adjusting the backrest and lumbar support keeps the torso and spine stable, while a slight recline helps the lower back maintain a neutral position with a natural lumbar curve, making a healthy sitting posture easy to keep! You can also pair it with a height-adjustable desk and alternate between sitting and standing for a truly healthy, comfortable office experience.