Pulse Rate Sensor

I am working on a healthcare application and I am using SPARK-FUN Pulse Rate sensor and it is returning values in three columns i.e. S B Q. Now I need to know ow can I use this information in a meaningful way so that the sensor reading can make sense? I have attached the data file in which the names of sensors and their corresponding readings are mentioned. Please take a look.
I await the replies.

Their tutorial seems to be an excellent explanation of how the device works and how to interpret the results.

Paul