What is Dynamic Sitting?

Office chairs fitted with either a Free-Float or Synchronous mechanism encourage Dynamic Sitting which is crucial for improved ergonomic comfort.

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Dynamic sitting occurs in an office chair that is fitted with a mechanism that allows the angle between the backrest and seat to change.

By continuously changing the angle between your back and thighs, you automatically stimulate, or activate various muscles in your lower back, core and legs. As a result, the blood flow through these muscles increases, bringing oxygen and other nutrients to the muscles and carrying away the waste products of muscle metabolism. By doing so, muscle fatigue and it’s associated pain is reduced, particularly in the lower back, core and legs.

Dynamic Sitting has long been acknowledged as the global benchmark for ergonomic comfort.

Office chairs fitted with either a Synchronous (synchro) or a Free-Float mechanism, encourage or aid Dynamic Sitting.

1. Synchro Mechanism

Synchro mechanisms are mechanical swivel & tilt devices that allow the angle of the chair backrest and seat to change in a fixed ratio

A synchro mechanism ensures that the movement of the backrest is always greater than that of the seat. Most synchro mechanisms have a 2:1 ratio. This means that the backrest will tilt backwards by 20 for every 10 of seat tilt. This ratio is fixed and cannot be altered.

If the mechanism is unlocked, it will be free-floating. In this position, the chair is dynamic and the backrest provides continual back support by moving with you.

Synchro mechanisms are fitted on most of our Ergonomic office chairs.

Synchronous (synchro) Swivel Mechanism

2. Free-Float Mechanism 

Unlike a Synchro mechanism where the backrest and seat move in a fixed 2:1 ratio relative to each other, a Free-Float mechanism allows you to independently, or separately, adjust the seat and backrest of the chair. 

A Free-Float mechanism allows you to adjust the angles of the seat and backrest independently to suit your preferred sitting position.

Free-Float mechanisms promote Dynamic Sitting and all orthopedic office chairs use a Free-Float mechanism. What is an orthopedic office chair?

Like a synchro mechanism, if the Free-Float mechanism is unlocked, the chair is dynamic and the backrest provides continual back support as it moves with you.

free-float mechanism
Free-Float or Fully Independent Swivel Mechanism

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