I strained my hamstring by playing vigorously. The violinist suddenly began playing vigorously.
He's on the roster of the Chicago Cubs but on May 27th, 2009 he strained his left hamstring & was placed on the 15 day disabled list
hamstring
A person can get hamstring injuries by not warming up and stretching before exercising or simply being a teenager and just growing. Hamstring injuries can be prevented if a person warms up and stretches before doing a running activity.
I doubt very much if pulling your hamstring causes bruising, because bruising is bleeding under your skin, so if it's bruised you should get that checked.
No, a torn ligament is a sprain. A sprain can happen when a ligament is overstretched. It can be caused by a twist or wrench. So a twisted ankle is a sprained ankle. A strain refers to when you tear or overstretch a muscle or tendon (which attach muscles to bones). This can be caused by a sudden stretch or extra effort. So a pulled hamstring is a strained hamstring.
A pulled hamstring takes weeks to heal and it's not a good idea to play at all. If you can even walk you're doing well and if you can walk without moderate to sever pain then it's probably strained and not pulled. Either way you will aggravate the injury and turn a couple of weeks into months.
for what are the hamstring responsible?
The biceps femoris is part of the hamstring. The other parts of the hamstring are the semitendonous and the semimembranous.
Usage. If they are strained they grow bigger, if not used they shrink.
the hamstring
Hamstring