# \#flexibility **URL:** https://forum.barbellmedicine.com/tag/flexibility/209.md [Latest](https://forum.barbellmedicine.com/latest.md) · [Categories](https://forum.barbellmedicine.com/categories.md) · [Tags](https://forum.barbellmedicine.com/tags.md) --- ## [Chronic muscle shortening & sarcomerogenesis](https://forum.barbellmedicine.com/t/chronic-muscle-shortening-sarcomerogenesis/4566)
**Author:** [@David\_Lex](https://forum.barbellmedicine.com/u/David_Lex)\ **Replies:** 1\ **Last updated:** [January 7, 2019, 11:16pm UTC](https://forum.barbellmedicine.com/t/chronic-muscle-shortening-sarcomerogenesis/4566 "2019-01-07T23:16:50Z")
Hey guys, I was wondering if chronic muscle shortening is actually a thing (i.e. shortened psoas due to sitting for 8hrs) and if not, is there a reliable source/study that backs it up? I’ve also stumbled upon the concept…