The first 0-gravity, full-body massage chair available in the US came out in 2004. A very few - the OHCO M-Series are examples of this - can vary the seat-to-back angle and offer users additional benefits and flexibility. Almost all zero-gravity massage chair designs have a fixed angle between the seat and the backrest.
In other words, the massage chair should maintain a slightly “open” posture between your legs and your torso. The angle between the backrest and the seat should be about 115-degrees.In some instances, the footrest or ottoman design of a Zero-G massage chair is the means by which to raise the legs to the level of (or above) the heart. Only in this instance can a user enjoy the circulatory benefits of the zero-gravity posture. A zero-gravity massage recliner must be able to get the user’s legs (and feet) even with or above the level of their heart.The ability to do this is the next requirement we’ll stress. This deep recline is NECESSARY if the chair is to get your legs even with or above your heart. To make a legitimate zero-gravity claim, recline angles must be able to go from the upright posture to about 90-degrees of recline. In the world of zero-gravity designs, it is not. A majority of people describe this as a deep recline. For comparison, most ordinary recliners lean back about 60-degrees. Placing your spine in a position that is almost parallel to the floor. The backrest must be capable of a deep recline position.A properly described zero-gravity massage chair (or regular recliner) must have the following attributes: Enabling you to find the best zero-gravity massage chair. We think this description of the zero-gravity position may help you navigate through the multitude of massage chairs. Unfortunately, not all of the claims are made by serious companies that are serious about massage chairs. Many brands claim to offer zero-gravity massage chairs. Bringing the zero-gravity posture (or neutral posture) into the design of the furniture in your own home. So thanks to NASA, you can now enjoy the benefit of recliners or full-body massage recliners. NASA may indeed have introduced the public to the concept of a zero-gravity position. It is the most natural and relaxing body position for humans. It’s also the position a fetus takes in the womb. You might have noticed that your body takes this position when you are submerged in water and totally relaxed. Quite simply, “zero-gravity posture” refers to what our bodies do when relaxed in a weightless environment. So, if you are lying completely flat, that is not “zero-G”. The Skylab video analyses formed the basis of what is today known as “neutral body posture”. Long after the seminal Mercury and Gemini missions, and the Apollo lunar missions. NASA’s investigations into body posture began with Skylab in the 1980s. You may have heard that the zero-gravity position in a massage chair was inspired by NASA, or that it’s the position that astronauts sit in before take-off. As your body experiences this relief, you can rest, relax and truly heal. The legs-above-heart position of zero-gravity reduces the strain on your heart, allowing it to more efficiently pump energizing oxygen through the body, providing relief to tired, sore muscles, as well as reducing the effects of high blood pressure, atherosclerosis, diabetes, varicose veins, and edema. In this natural reclining posture-one your body instinctively understands as healing -your weight is distributed evenly, and your spine is relieved of body weight.