Homework Answers
In clinical settings, it is advisable to record the heart rate for 60 seconds rather than a shorter duration like 15 or 30 seconds because it is to eliminate the phenomenon of HBV (Heart Beat Variability). HBV is the fluctuation in rhythms of the heartbeat. These fluctuations may occur in both healthy & unhealthy individual (though the variability may differ). Using a shorter duration like 15 or 30 seconds may be incorrect as there could be errors, mistakes or just an overlook, which when extrapolated to 60 seconds might give an abnormal heartbeat calculation.
Example: If there is an error during 15 seconds, when extrapolated to 60 seconds, it has to be multiplied by 4 (15 second x 4 = 60 seconds). So when there is an error in 15 seconds counting, it will be 4 times the actual when extrapolated to 60 seconds.
In case of counting heartbeat for 60 seconds, chances of multiplying the error is minimized and also it reduces any fault in the count.
Thus it is advisable to count the heartbeat for 60 seconds.
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