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This can improve muscle strength if the user attempts to contract the muscle simultaneously. Other e-stim types In addition to EMS and TENS, your doctor or physical therapist may recommend other e Introduction to Correct Muscle Stimulation through EMS. Optimizing the Frequency and Pulse Duration for Muscle Build-up and Endurance. Skeletal muscles basically consist of two types: White muscle fibers that contract quickly. These need a lot of energy and tire quickly. Red muscle fibers that contract more slowly.