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" ... The study found that the functional, cross-sectional area of the paraspinal muscles decreased by an average of 19 per cent from preflight to immediate post-flight scans. A month or two later, only about two-thirds of the reduction had recovered. There was also a big reduction in the functional cross-sectional area of the paraspinal muscles relative to the total paraspinal cross-sectional area. The ratio of lean muscle decreased from 86% before the mission to 72% immediately afterwards and 81% a couple of months later. ... "