Astronauts can grow three inches during space missions - leaving them with chronic back pain.Weightlessness allows their spines to straighten, making them ‘grow’ but when back on earth gravity crunches it back which can leave them in debilitating pain.The spinal curvature, an S-shaped bend that helps the spine resist gravity, stays flexible and absorbs weight and impact.However it flattens out in space and MRI scans found astronauts - like William Shatner following his flight on Jeff Bezos’s Blue Origin - may have a smaller curve in their spine on their return.Experts from Johns Hopkins University in the United States, analysed existing studies, for their new research.Dr Radostin Penchev resident physician at The Johns Hopkins Hospital,.
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