Respiration Rate using accelerometer

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hi, i'm doing project in have measure respiration rate of person. actually, i'm trying accelerometer, couldn't find usefull information/algorithm obtain frequency readings able distinguish body movements torax movements (the accelerometer in torax of person).
do have information/ideas on how can make work?
do think there easiest way obtain it?
thanks in advance!

keep in mind respiratory motion rather minor, , if person moving little, not getting reliable information technique.


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