There are moments at a desk when no amount of fiddling with the chair makes things feel right. You set the monitor height, you adjust the backrest angle, and yet your toes still reach for the floor and never quite find it — or worse, only part of your sole touches down while a faint tension lingers in your calves. Most people blame this on "my posture" or "a chair that doesn't fit me," but a surprising share of the cause lives in the desk itself. The work surfaces of the office and study desks most widely sold in Korea are fixed at a height of roughly 72cm.
Why 72cm is where the trouble begins
The figure of 72cm is less a scientific ideal than an industry convention, one that hardened around the average-height adult man. The problem is that this single height then gets applied to everyone. Anthropometric research has long argued that work-surface height should be matched to the elbow height of a seated person (Grandjean & Hünting, 1977). When you raise your chair to meet a desk you cannot lower, your elbows and shoulders may feel fine — but you pay for that comfort by lifting your feet away from the floor. The shorter you are, or the shorter your legs relative to average, the wider that gap grows. Because the desk height cannot change, the chair goes up; because the chair goes up, the feet float. The chain of cause and effect is set in motion.
What happens in the body when your feet do not reach the floor
When your feet hang in the air, the back of the thigh — more precisely the soft tissue along its underside — is pressed against the front edge of the seat. This is exactly where the blood vessels and nerves that run down into the leg pass through. Ergonomics literature has raised again and again that pressure from the front edge of a seat can restrict blood flow to the lower limbs in a seated posture. With no support beneath the feet, the full weight of the legs settles onto this single point of compression, so the longer the same posture is held, the more readily a heaviness in the calves and a tingling at the toes build up.
A second change unfolds at the pelvis and the spine. When the feet rest on the ground, the body channels part of its weight downward through the feet, shins, and thighs. Take that support away and the path of distribution disappears, so the seated person unconsciously slides the pelvis forward or rounds the back to recover a sense of balance. When the pelvis tips backward like this (posterior pelvic tilt), the natural curve of the lower back flattens and the way pressure is distributed across the spine shifts. Since Nachemson's classic work (1981), it has been well established that the pressure inside the spinal discs is higher when sitting than when standing, and a slumped seat with a collapsed pelvis pushes that pressure in an even less favorable direction.
How "foot support" changes posture
The moment a stable surface arrives beneath the feet, the body responds differently. As soon as the sole meets a firm support, the foot stops being a mere resting point and becomes a reference that organizes posture. The pressure receptors in the sole work together with the position sense of the ankle, knee, and hip, so the body reads its own position more accurately and fine-tunes its balance. Ergonomics research has consistently observed that once foot support is secured, the stability of the seated posture rises and postural sway is reduced.
The crux lies in the knee angle and the thigh angle. When the feet are supported so that the knees open out toward roughly a right angle and the thighs sit nearly level with the floor, weight is borne evenly on the sit bones (the pelvic bones that meet the seat when you sit). As a result, the compression beneath the thigh that had been concentrated at the front edge of the chair eases, and as the pelvis comes closer to neutral the lower back finds it easier to recover its natural curve. For anyone who works or studies in one place for long stretches, this small difference in angle compounds into a large one.
The real problem is "not moving"
That said, supporting the feet does not settle everything. A more important principle in ergonomics is minimizing static load — that is, not freezing into a single posture. However good a posture may be, holding it in the same shape for a long time piles a continuous load onto particular muscles and tissues. For this reason, recent research stresses the value of "dynamic sitting" — shifting posture often and moving in small ways even while seated — rather than hunting for one single "perfect posture" (Callaghan & McGill, 2001). When the foot support gives room to flex the ankle or lightly swing the legs, rather than acting as a flat fixed platform, the muscles in the legs keep working gently, which in turn supports circulation in the lower limbs.
In short, the ideal form of a footrest satisfies two things at once. One is enough area and an appropriate height for the feet to land on stably; the other is the freedom for the feet and legs to keep moving on top of it. This is precisely why an environment that supports firmly yet still allows small movement is better than a fixed, flat plane.
If you cannot change the desk, change what is under your feet
Realistically, cutting down a 72cm desk you already own or replacing it outright is hard to do. So the ergonomic approach has long chosen to adjust the environment beneath the feet rather than the desk itself. A footrest that raises the height of the feet to restore the knee and pelvis angles and ease the compression under the thigh is, in this light, regarded as a cost-effective solution.
ROUMO's LC99 grew out of this same principle. Rather than stopping at simply propping the feet up on a flat surface, it is a footrest designed so the feet can naturally rock and tilt on top of it — aiming for "stable support" and "dynamic movement" together. For anyone whose desk height cannot be changed and who wants to rebuild the reference point of their posture starting from beneath the feet, it is worth thinking about your own leg length and sitting habits and checking, just once, the height and movement of your foot support.
You can read more about ways to make a desk environment — where you sit and work or study for long hours — a more comfortable place at roumo.store.
This product is not a medical device and is not intended to diagnose, treat, cure, or prevent any disease. Individual experience may vary.
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