https://www.health24.com/Medical/Sl...oblems/Effects-of-prolonged-bed-rest-20131025
Effects of prolonged bed rest
Effects on the lungs and blood
Bed rest increases the risk of pneumonia and atelectasis (collapse of lung tissue).
Fluid tends to build up in the lungs because the muscles aren’t working to remove excess fluid from the body. It’s harder for the lungs to expand when you’re lying flat, so blood pools in the chest area, leading to decreased lung volume. Coughing is not as effective due to weakened abdominal and chest muscles, causing mucus to collect in the lungs.
Breathing also becomes shallower, which leads to poorer oxygen-carbon dioxide exchange in the lungs.
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Even when sick, do some exercise, bois.