Electrotheraby for injuries??

[Finnegan Bell]

http://en.wikipedia.org/wiki/Electrotherapy

I read very good things about EMS as you can see the list of benefits in Wikipedia.

The question is: Does EMS masks the pain by only loosening the tight muscles?? I had bicipital/shoulder tendinitis and I feel pain in my biceps and triceps when bench press. But the pain has decreased dramatically in my biceps after 1 session. How is that possible? Its too good to be true. And even if it only loosens the muscle and elevates the pain this will allow the tendon to heal faster.

Please people of ET or Ultrasound ,what are your experience? Both helped me immensely with neck muscle pulls ,but with shoulder injury?? mmmmm.