What do i need to measure muscle activity

Can some body explain what i need to measure muscle activity?
i have a 6210
so i have to buy emg sensors but ,do i need amplifier for this signal ? can i use amplifier that i use for strain gauge's?
what elso on hardware side do i need?

You can buy low-cost bioamplifiers that have battery power (these are also safer to use) such as this: http://www.grasstechnologies.com/products/amplifiers/p55.html
The AC line noise (50/60Hz) is not just from AC powered instruments - it is also radiated EMI that comes from lighting, wall wiring, etc. - it is very hard to avoid. A good bioamplifier will reject this noise since it is common-mode (appears in both electrodes more or less equally) and only the difference signal is amplified and passed to the DAQ device for digitizing.
Visit the NI Biomedical User Group at:
www.ni.com/biomedusers

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Since I am new bee for labview, I want to count the no. of rotations that the compass will be rotating. I just did for one count, but I need to measure the count continuosly. Please some one to help me as soon as possible. Attached is me code. Please do the needful.
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Attachments:
Compass Count.vi ‏10 KB

The event structure reads the value and, depending on its last state and current state, makes a decision. You should try to look at the logic in the different states and follow what it happening.
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What do i need to measure muscle activity

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