We can find no subsequent reviews that contradict their results. Together, these reports review the medical and ergonomic research of the past 60 years and cite hundreds of studies. The take home points:
TRANSLATED: If you sit slouched and slumped (kyphosed) it is more harmful than sitting with a natural reverse curve of the spine. In standard sling-style travel chairs you are forced into the slumped and slouched posture - it is almost impossible to sit up straight in sling-style chairs for any length of time. STRONGBACK Chairs, however, provide back support and promote the more healthy "lordosed" seated posture recommended by researchers. You can sit all day long in proper posture in a STRONGBACK Chair.
TRANSLATED: The popular slumped and slouched position, the position you are forced into when using standard sling-style travel chairs, is causing damage to your spinal health. Don't do this to yourself. Save your back, throw away your old travel chair, buy a STRONGBACK Chair
TRANSLATED: If you sit with a slumped and slouched posture you increase your chances of getting a bad back. How much is good back health worth to you? Throw away your old travel chair and buy a STRONGBACK Chair - it is much cheaper than doctors visits.
TRANSLATED: If you want to prevent back pain while seated, sit with your back in its naturally "S" shaped position with a reverse curve in the lumbar region (lordosed), not slouched and slumped, and get up and move around regularly. That is, do not sit in standard sling style chairs, sit in STRONGBACK Chairs and get up and move around once in a while.
Subjects in seats with backrest inclinations of 110 to 130 degrees, with concomitant lumbar support, have the lowest disc pressures and lowest electromyography recordings from spinal muscles.
TRANSLATED: Tilting the chair back a bit and providing lumbar support are the best ways to take pressure off of your discs and relax your back muscles. In other words, this is the most comfortable and healthy way to sit - exactly how the STRONGBACK Chair is designed
For more reading on back health and proper seated posture we recommend you purchase the full PDF version of the above articles and browse their lists of hundreds of additional articles.