Some years ago, I had the good fortune to come across a bit of research, from a Swedish University, on Recliner Chairs and back health.
The study found that people whom owned recliner chairs have a higher rate of back pain than people who sat on typical chairs, i.e. fixed nonmechanical chairs.
The back pain is thought to be due to the spinal column’s natural alignment, acting like a stack of coins (the stack sits comfortably and without stress in a vertical column). However, were you to lay down the stack of coins on an incline it will spread out. Each coin, in the stack, will touch the surface of the next coin, also on an incline. As something has got to give, the square edge of the coin digs into the surface of the next coin, coin after coin, after coin. The coin is a metaphor for the vertebrae in your back.
The coins and your back have a stress point, when there is an incline and intense pressure from repeatedly sitting on an incline, where the coin edge/vertebrae touch, causes back pain!
In my experience recliner chairs are often sold for their comfort value and health, aka ‘bad back’, reasons. The inclined stacking of the vertebrae causes damage to the long-term health of your back the recent research, I know of, suggests.
People with back pain often buy recliner chairs and find them very comfortable, but the long-term effect of this sitting position is a worse back that is weaker because of lack of passive exercise from sitting more upright.
Please consider this when you are out looking for a suitable chair for your Grand Parents or Mother and Father’s comfort needs.