- 10 -
it is recommended that the use keep strictly still at least 10-15 second.
3) The respiratory signal may be very subtle due to the body difference of different
persons.
4) The heart rate veries fast.
A: The heart rate may vary a lot during the test, which dues to the fact that the
heart rate may change with the environmental noise, interference from other
objects, respiratory harmonic frequency and other factors. The final heart rate
converges to an stable value after a relative long still keeping.
