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Plantronics BackBeat Sense bluetooth headphones Photograph: Samuel Gibbs for the Guardian. BackBeat Sense are some of the most comfortable on-ear headphones I have worn. They donât pinch my ears as much as most others and are light on the head.
Beat-to-beat or short-term variability is the oscillation of the FHR around the baseline in amplitude of 5 to 10 bpm. Long-term variability is a somewhat slower oscillation in heart rate and has a frequency of three to 10 cycles per minute and an amplitude of 10 to 25 bpm.Clinically, loss of beat-to-beat variability is more significant than loss of long-term variability and may be ominous.Small square = 10 seconds; large square = one minute). Interpretation of the FHR variability from an external tracing appears to be more reliable when a second-generation fetal monitor is used than when a first-generation monitor is used.