No, the circulation for the legs passes behind the knees. The straps are placed on the shinbone and are designed to absorb pressure without cutting off your circulation. However, it is important to remember that the circulation in the legs is greatly enhanced by movement. Because you will be able to sit for much longer periods more comfortably, we recommended that you take sensible breaks to stand, stretch, walk and breathe deeply at least once each hour.
The slings can be safely worn all day. While most people report immediate and complete relief from the pain of sitting slouched, you can realistically expect the benefits to continue as long as you wear the sling. And when you stand up or walk after using the Nada-Chair, it is not uncommon to feel a "halo effect" of well being and good posture for sometime thereafter. As with any new product, you may need to experiment and make fitting adjustments to optimize the longest, most comfortable sitting period. Because you will be able to sit for much longer periods more comfortably, we recommended that you take sensible breaks to stand, stretch, walk and breathe deeply at least once each hour.
Three considerations can help you make a good decision: 1) your body size, 2) the activity you plan and, 3) the need for accessories. The system of support is similar in all the products but there is an important difference between the effects of elastic or non-elastic support. Then there is the question of the varying extent which pressure is distributed on the back and knees. Finally, there are accessories available to enhance the use of the products.
The Back-Up is our most popular seller and the choice for those who want over twice as much cushion on the knee and back compared to other non-elastic models. We recommend it for long-term sitting tasks such as computer work and also for people (though, not exclusively) with a bigger body builds. The accessory Cush-Shins (included) distribute pressure on the upper shin over nearly three times the area making it much more comfortable for longer sitting periods. Accessory Stretch Straps (not included) engage the feet to allow hamstring stretching or long-sitting on the ground. All the non-elastic versions offer incrementally adjustable and stable positioning which is ideal for therapy or for situations where one must rely on the product for sole support, for example, at the ballgame, in a canoe or sitting yoga-style on the ground..
The S'port-Backer supports exactly like the Back-Up model but might fit smaller body builds better. What's a "smaller body build"? Roughly, anyone 130 pounds or less. Most find the slidable cushions provide adequate padding for the knees and those who don't can purchase accessory Cush-Shins. Accessory Stretch Straps can also be used with this product.
The Slouch!Buster is soon to be discontinued. It provides great support but has no knee cushions - not the best choice for someone who is heavy or those sitting for long periods. Along with the BackRx, it finds its place with mountaineer or space-conscious backpacker who counts-by-the-ounce.
Some rely on the elastic BackRx as their only solution. While the strong elastic satisfies much of the need for support, this product will never be the therapeutic tool that allows incremental adjustments to fully stabilize the pelvis. The elasticity provides augmentive support while primarily depending on existing chair backs as offered in airlines, cars, or on the couch. Many use it as a "travel version" and leave their non-elastic model at home or work. It is also the perfect choice for those, like manicurists, dentists, assembly-line workers, who must lean foward to work and are required to frequently alter their position. It auto-adjusts according to the way you lean while constantly multiplying your muscles' effort in providing postural support. NOTE: the BackRx can safely be used for driving automatic transmission cars by simply sliding the right leg free of the elastic loop. Adequate support for the lumbar area will be maintained by the left leg.
The LumbarJack knee detourThe LumbarJack is the only product we recommend using while driving with manual transmission. Elastic straps detour around the knees and engage the feet to allow complete flexibility and mobility of the legs for working the pedals. When you use the alternate non-elastic straps, the LumbarJack conveniently converts to a comfortable sitting support using only the knees.
Like a good fitting pair of shoes, the Nada-Chair back slings should fit snugly but not too tightly. Much of the adjustment is self-corrective. If you feel uncomfortable over time, simply loosen the straps slightly. The goal is to keep the low back supported just enough to prevent the sagging that leads to back pain. It is recommended to vary the support by alternatively tightening and loosening the straps when you are sitting for longer periods.
The back pad should span the lumbar spine with the back cushion approximately centered on the belt line. Experiment until you find the most comfortable position for you.
No. A study of users tested in critical movements such as braking and clutching proved that the LumbarJack does not slow the user. Copies of this study are available upon request.
Experience shows just the opposite. Doctors internationally are using the back slings to teach their patients to sit straight. Once trained in new habits of good posture, users find it easier to sit properly without the supports. Primarily, the back-sling acts as a guard against slouching and disc damage because it works like an extra muscle to keep the back supported. Unfortunately, the major contributor to back disease and weakness is the common office chair that provides only the illusion of support while causing the user to slouch against the backrest.
Absolutely! By keeping you from slouching, the back slings can actually prevent progressive spinal deformation and disc degeneration. It is critical to the long-term health of your back that the alignment of the vertebrae be maintained with the natural curves in the back.
Yes, the Nada-Chair slings will effectively improve your posture in any chair. The back-sling provides the additional lumbar support that most seat backs lack. When using the sling to augment an existing back support, it isn't necessary to tighten the straps as much as when you are depending on the sling for full support.
Simply tuck the dress or skirt down enough to allow the straps to engage the knees.