With the use of electromyography, they were able to identify which movements activated the butt muscles to the highest percent. (verywellfit.com)
The existence of regions within hamstring muscles have been assessed both by anatomical investigation and by using electromyography (EMG). (strengthandconditioningresearch.com)
Such differences might be reflected in differences in agonist activation (measured by electromyography) and voluntary activation, and the sources of the differences could occur at either the spinal or cortical levels. (strengthandconditioningresearch.com)