Below are some helpful links to articles regarding the importance of ergonomics and tablet use.
"Ergonomics is the science of aligning workplace products with the human body's natural curves and rhythms. Bad ergonomics happens when a product, such as a chair or computer equipment causes strain in the body due to poor alignment – it could cause back pain, neck strain, eye strain, carpal tunnel, and other kinds of repetitive stress injuries (RSI). An RSI injury develops over time and is caused by the repetitive use of a product that is not aligned with the body's natural posture." - Salma Jafri, Suite
"Smartphone users spend an average of two to four hours per day hunched over, reading e-mails, sending texts or checking social media sites. That’s 700 to 1,400 hours per year people are putting stress on their spines, according to the research. “As you stretch the tissue for a long period of time, it gets sore, it gets inflamed,”...It can also cause muscle strain, pinched nerves, herniated disks and, over time, it can even remove the neck’s natural curve." - Lindsey Bever, The Washington Post
"The study found that the worst way to use your iPad is on your lap. Whether you are watching a movie or typing, keeping your iPad on your lap places greater strain on your neck and shoulders, which can result in pain and potentially greater posture issues in the long run." - Josh Smith, GottaBe Mobile
"One of the biggest challenges for the iPad is the viewing angle for the screen. If you put it on your lap or desk top, you will strain your neck from constantly looking down. For watching movies or any other long-term viewing, place your iPad at a better viewing angle to protect your neck and shoulders." - Ergonomics Made Easy
"Strain on neck muscles increases 3-5 times when using tablet computers compared to sitting with the head in a neutral position, according to recent research by Anita Vasavada at Washington State University. The lowest demand on the neck was when the tablet was in a high propped position." - WSU News