System and method for determining changes in a body state

A computer-implemented method for analyzing transitions in a body state, comprising:

• receiving a signal from an individual indicating a measurement of cardiac activity over a period of time;
• calculating a derivative of a heart rate based on a reoccurring feature of the signal;
• extracting a plurality of heart rate accelerations or decelerations based on the derivative;
• and
• identifying a transition in the body state based on the plurality of heart rate accelerations or decelerations.

A computer system for determining changes in a body state of an individual, comprising:

• a monitoring system configured to monitor cardiac activity;
• a signal receiving module configured to receive a signal from the monitoring system, said signal representing a measurement of cardiac activity over a period of time;
• a feature determination module configured to determine a signal feature, wherein the signal feature is a reoccurring event of said signal over the period of time;
• an interval determination module configured to determine a first interval between two successive signal features and a second interval between two successive first intervals;
• a derivative calculation module configured to calculate a derivative of a heart rate based on the second interval;
• and
• an identification module configured to identify changes in the body state based on the derivative.

A non-transitory computer-readable medium storing computer-executable instructions that when executed by a computer, which includes at least a processor, cause the computer to perform a method, the method comprising:

• receiving, using the at least a processor, a signal indicating a plurality of cardiac cycles of an individual over a period of time;
• detecting, using the at least a processor, a signal feature, wherein the signal feature is a reoccurring event of the signal over the period of time;
• and
• calculating, using the at least a processor, a first interval between two successive signal features;
• calculating, using the at least a processor, a second interval between two successive first intervals;
• calculating, using the at least a processor, a derivative based on the second interval;
• and
• identifying, using at least a processor, changes in a body state based on the derivative.