A very general question. Could you be more specific? Microarrays can be used in which, generally, mRNA from a tissue/cell line is used in creating samples that converted to a large number of DNA sequences that are immobilized onto a solid surface in an ordered array. (source: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC444812/)
You can look up gene expression values for normal human tissues via Illumina body map expression atlas page. Click on the
organism parts link in left column. You can then select just
skeletal muscle tissue in the dialog box that opens.