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Needle measurement of electrical activity in voice box muscles

Needle measurement of electrical activity in muscles on side of body

Needle measurement of electrical activity in muscles on both sides of body

Needle measurement of electrical activity in middle spine muscles

Needle measurement of electrical activity in arm, leg, trunk or head muscles, limited study

Needle measurement of electrical activity in muscle, including jitter, blocking and/or fiber density

Needle measurement of electrical activity in trunk or head muscles

Nerve conduction, 1-2 studies

Testing of autonomic (sympathetic) nervous system function, heart rate response to breathing exercises, and passive tilt

Testing of autonomic (sympathetic and parasympathetic) nervous system function, at least 5 minutes of tilt