The difference between tilt-in-space and recline can be recognised by watching the seat and the backrest. In recline, the angle between them changes; in tilt-in-space, they tilt together relative to the floor. Zero Gravity, on the other hand, is a position obtained by combining several adjustments, with the lower body and legs raised. Understanding this distinction lets you ask for a precise demonstration and choose the functions that are useful for the person, without confusing the name of a position with the movement that produces it.
In brief
Recline changes the angle of the backrest relative to the seat; tilt-in-space tilts them together, keeping their relationship substantially unchanged. Zero Gravity combines several adjustments, while the rise function and vertical height adjustment serve other movements. To understand these differences, it helps to watch not only the final position, but also the path taken to reach it and to return to the usual seated position.
Why position names are not enough to compare two chairs
A family may be looking for a more comfortable position for a parent who spends many hours sitting, and find descriptions that seem identical: relax, zero gravity, tilt-in-space, bed. If it is not clear what moves, it becomes difficult to understand whether the function really meets the need.
The problem is not solved by counting motors. Two adjustments may be independent or linked in a sequence; a final position may require several movements. That is why the comparison must distinguish the component being driven, the path it follows and the activity you want to carry out.
Sollevita integrates from 5 to 8 independent motors, depending on the weight capacity, to adjust the different functions. The page on the real differences between Sollevita and a standard riser recliner presents the overall design; here we look at which parts move and how to recognise the different adjustments. [1]
Recline: the backrest leans back relative to the seat
In recline, the backrest changes angle relative to the seat. It can bring the trunk towards a more reclined position while the other elements are adjusted according to the intended system. To understand the movement, picture a line along the seat and one along the backrest: the angle between the two changes.
The chosen position can be useful for watching television, reading or getting ready for a break. The widest angle is not automatically the most comfortable: what matters is where the person finds support and how they manage to keep up the activity they want.
The footrest and the Push Head powered headrest complete the adjustment, but they are separate elements. Reclining the backrest is not automatically the same as raising the legs or supporting the head better. During the agreed trial, ask which movements can be controlled separately and which require a specific sequence.
Tilt-in-space: the seat and backrest tilt as one unit
Tilt-in-space changes the orientation of the seat-backrest unit relative to the floor. In terms of the geometry of the movement, the relationship between seat and backrest remains substantially stable while the whole unit tilts.
It is a different option from reclining the backrest alone. It can allow a change of position without the person having to reposition their pelvis manually each time. Its usefulness must still be considered together with padding, supports and individual abilities. [1]
The mechanical relationship between seat and backrest remains substantially stable, but the position of the body also depends on cushions, supports and starting posture. That is why the movement should be observed with the person, especially when specific supports are needed.
Resources from Swiss Paraplegic Research explain that the pelvis, spine, gaze and balance are connected in the seated position. It is therefore useful to consider the different supports together when looking for a more comfortable position. [2]
Zero Gravity: a position created by several adjustments
In Sollevita’s Zero Gravity configuration, tilt-in-space, backrest and footrest are combined to achieve a position with the lower body and legs raised. The Push Head can complete head support in the chosen position. [1]
So there is no simple “one button, one motor, one function” equivalence. The name of the position describes the overall result, not how many components moved to reach it. To understand the difference, it helps to observe the individual adjustments first and then their combination.
The value to look for is the person’s comfort in their own routine. There is no need to reach the deepest configuration just because it is available. Raised legs, head support and ease of return must remain compatible with the person’s needs and with any guidance already received.
Zero Gravity offers an option for resting with the legs and lower body raised. The feeling of lightness and the comfort remain personal and are not equivalent to treating a medical condition. The Sollevita relax positions are chosen according to the user’s preferences and any guidance received.
Comparing the movements: what changes in the chair
The table helps you recognise the movements during an explanation or a demonstration video. For the actual angles and ranges of movement, consult the product sheet; the most suitable position must then be assessed with the person.
| Function or position | What to observe | What it does not mean |
|---|---|---|
| Recline | The backrest changes angle relative to the seat | It is not automatically tilt-in-space |
| Tilt-in-space | Seat and backrest change orientation together relative to the floor | On its own, it is not the same as Zero Gravity |
| Zero Gravity | Several adjustments build a position with the lower body and legs raised | It does not identify a single motor or a therapy |
| Vertical height adjustment | The whole structure changes height with the person seated or lying down | It does not in itself help the person to stand up |
| Rise function | The seat assists the transition to standing | It does not automatically replace a patient hoist |
The distinction is also useful when describing a difficulty. Saying “I’d like the pelvis higher for personal care” points to a different problem from “I’d like to tilt the seat without reclining the backrest yet”. The Sollevita Team can then explain the relevant function, instead of replying with a generic list.
Vertical height adjustment, rise function and lie-flat position: why they should not be lumped together
Vertical height adjustment changes the height of the whole chair while the person stays seated or lying down. It can be useful for bringing the surface to a more comfortable height during some care activities, or for preparing to line the chair up alongside another surface. It should not be described as an alternative form of the rise function. [1]
The rise function, by contrast, assists the transition to standing and the return to sitting. Its role depends on the movement planned for the person. Having this function does not mean it has to be used if the person gets out of the chair by means of a different assisted transfer.
The 180° lie-flat position refers to the fully extended configuration. The lie-flat transfer configuration links that surface with vertical height adjustment and side access for some transfers. Resting and transferring remain separate uses: a reclined backrest alone does not prove that a chair is suitable for being placed alongside a bed.
How to ask for a clear demonstration without random trials
Ask for a steady side-on video, with the floor, seat and backrest visible. The technician can show one adjustment at a time, starting from the positions permitted for that product. Repeated trials with a frail person are not needed to show a geometric difference clearly.
In the recline demonstration, watch the change in the seat-backrest angle. In the tilt-in-space demonstration, watch the orientation of the whole unit. Finally, look at how the adjustments are combined in Zero Gravity. Lines overlaid on the video should explain the principle, not pretend to be a certified measurement in degrees.
Also ask to see how the movement stops and how the chair returns from the position shown, following the instructions. A video that shows only the final result does not make clear how accessible the controls are, or the sequence needed to return to the usual seated position.
For the trial with the person, on the other hand, select only the activities that are really necessary, with appropriate support. Do not mechanically block the backrest or interfere with the moving parts to isolate a movement: the demonstration uses the controls provided, not improvised devices.
From function to activity: a short observation sheet
Before the trial, write down what you want to make more comfortable. “Watching the screen without losing head support” is more precise than “more relaxation”. “Changing the angle during a break” is different from “reaching the table without the armrest getting in the way”.
| Desired activity | Function to clarify | Useful observation |
|---|---|---|
| Reading or watching TV | Backrest and Push Head | Is the head supported while the gaze stays in the right direction? |
| Changing the seat position | Tilt-in-space | Is the movement easy to understand, and does the person stay comfortable? |
| Resting with the legs raised | Zero Gravity combination | Does the person like the supports, and is the return planned? |
| Lying down for a break | 180° lie-flat position | Are the surface, the handset and the way the rest period ends all suitable? |
| Receiving personal care | Vertical height adjustment and access | Are the height and the space compatible with the activity? |
The sheet is an aid to conversation, not a posture prescription. A function may be valuable at one moment and not at another. Independent adjustments exist precisely to offer alternatives, without looking for a single configuration that works for the whole day.
When several adjustments help and when they are not enough
The movement options are particularly interesting when conversation, rest and care all take place in the same chair. The person, or whoever is with them, can look for a different position without changing seat each time, within the limits of the intended use.
However, the functions do not automatically make up for the wrong measurements. An unsuitable seat depth can keep the back away from the backrest even with a good headrest. A handset that cannot be reached can make a technically available adjustment hard to use. The assessment must cover the basic seating and the controls, not just the angles.
When specific supports or attention to the skin are needed, the healthcare professional decides which positions to use and when to change them. Tilt-in-space and recline make it possible to adjust the supports, but they do not decide on their own how often and how position changes are made.
Questions that prevent misunderstandings when comparing chairs
Ask which parts move, which stay still and whether the adjustment is independent. Ask which function changes the height of the whole structure and which one assists standing up. For Zero Gravity, ask how it is achieved on the configuration shown.
Avoid comparing two photographs as if they showed the same movement. Two backrests can reach a similar angle with the seat oriented differently. In the same way, the word “ergonomic” does not explain the kinematics or prove that the chair is suitable for the person.
The final question is practical: “How do I get back to the position I normally use?” The freedom to choose a position is valuable when the controls, stopping and return are also clear, not just the most impressive position in the demonstration.
FAQ
Common questions
What is the difference between tilt-in-space and recline?
Recline changes the angle of the backrest relative to the seat. Tilt-in-space tilts the seat and backrest together relative to the floor, keeping their relationship substantially the same. Watching the movement from the side helps you recognise the difference.
Are tilt-in-space and Zero Gravity the same thing?
No. Tilt-in-space is a movement; Zero Gravity is a configuration that combines several adjustments, including tilt-in-space. Using the two terms as if they were equivalent makes it less clear what the chair actually offers.
Does tilt-in-space keep the hip angle exactly the same?
This cannot be guaranteed for every person. The principle concerns the mechanical relationship between seat and backrest; cushions, posture and body movements can change the anatomical relationship. A specific postural need requires a dedicated assessment.
Does Zero Gravity need a dedicated motor?
You cannot tell from the name of the position. What matters is how the manufacturer combines and controls the movements. Sollevita has independent adjustments; the total number of motors depends on the weight capacity and does not match the number of commercial position names.
Is vertical height adjustment used to stand up?
It is not the function that assists that movement. It adjusts the height of the whole chair with the person seated or lying down. Sollevita has a separate rise function, used when it suits the person’s abilities and the way they get out of the chair.
How do I know which adjustment I need?
Start from the activity: reading, resting, changing position or receiving care. Ask for an explanation of the relevant movement and of the return sequence. The trial must also take into account measurements, supports and the handset, not just the final position.
Sources and references
[1] Sollevita — Care riser recliner: recline, tilt-in-space, Zero Gravity, rise function and vertical height adjustment.
[2] Swiss Paraplegic Research — Sitting position in the wheelchair (in French).
The next step: ask to see the movement, not just the position
Describe the activity you want to make easier and compare it with the functions of the Sollevita chair. An explanation from the Sollevita Team, together with a clear demonstration, helps you understand which adjustments really fit into your day and how to use them.
