What happens to a muscle protein after you work out?
Identification of the IGF-1 processing product human Ec/rodent Eb peptide in various tissues: Evidence for its differential regulation after exercise-induced muscle damage in humans.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Surprising Findings
The Ec peptide is produced naturally in multiple tissues alongside its precursor, not just as an artifact.
Many assumed E-peptides were just inactive leftovers — but finding them in heart, liver, and muscle suggests they have a biological role.
Practical Takeaways
Track your recovery by noting how sore you feel after workouts — Ec levels may correlate with muscle repair, though this isn't measurable yet.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Surprising Findings
The Ec peptide is produced naturally in multiple tissues alongside its precursor, not just as an artifact.
Many assumed E-peptides were just inactive leftovers — but finding them in heart, liver, and muscle suggests they have a biological role.
Practical Takeaways
Track your recovery by noting how sore you feel after workouts — Ec levels may correlate with muscle repair, though this isn't measurable yet.
Publication
Journal
Growth hormone & IGF research : official journal of the Growth Hormone Research Society and the International IGF Research Society
Year
2017
Authors
George Vassilakos, A. Philippou, M. Koutsilieris
Related Content
Claims (4)
When muscles are strongly activated during physical exercise, the body produces more insulin-like growth factor 1 (IGF-1), a protein involved in tissue growth and repair.
After exercise causes muscle damage, the levels of a protein called the Ec peptide change during the repair process in humans.
The IGF-1Ec peptide in humans and its equivalent in rodents are naturally produced in the body within tissues such as muscle, liver, and heart, alongside a larger precursor molecule, and are generated as part of the normal activity of the IGF-1 gene.
A specific protein precursor called pro-IGF-1Ec is cut by an enzyme named furin in human muscle and liver, resulting in a smaller fragment known as the Ec peptide. This indicates a biochemical process that modifies the protein after it is made.