03 Jul 2015 Blackmores Institute Just two weeks of inactivity reduces young peoples muscle strength 03 Jul 2015 Share Share on LinkedIn Share on Facebook Share on Twitter Share on Google+ Share on Pinterest News It is not only older people who lose muscular strength due to inactivity. New research reveals that it only takes two weeks of not using their legs for young people to lose a third of their muscular strength, leaving them on par with a person who is 40-50 years their senior. Researchers from the University of Copenhagen, Denmark, have examined what happens to the muscles in younger and older men after a period of high inactivity, by way of so-called immobilisation with a leg pad. × To continue reading this article, please Log In or Sign Up for access.