The present invention relates to a peptide comprising a muscle function enhancing amino acid sequence which is derived from the S100 calcium binding protein family. Furthermore, the present invention provides said peptide for medical use, in particular, for treating or preventing disorders associated with muscular malfunction, such as skeletal muscle or cardiac muscle disorders. The present invention also provides a pharmaceutical composition comprising said peptide and a method for treating or preventing disorders associated with muscular malfunction using said peptide or said pharmaceutical composition.
