I've noticed something troubling of late: when I hold my right hand out flat with my fingers spread, my index finger has a tendency to twitch back and forth violently. It doesn't do it all the time, and it seems to be steady when I place my hand on the bow. It only seems to be a problem when my fingers are straight rather than curved, as in a bow hold.
It's usually worse after I've been practicing. I'm wondering if this is an essential tremor, or if it's just a muscle spasm from the amount of stress placed on my hand from hours of practice each day. I've been trying to do some exercises to widen my index finger's range of motion without it trembling, but I can't yet attest as to whether or not they've been working.
Any thoughts as to what this tremor is? Any suggestions for how to decrease it or make it go away entirely? What could some of the causes be?
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