Pulse measurement device, pulse measurement method, and pulse measurement program

A pulse measurement method comprising:

• detecting pulses with a pulse wave sensor configured to be attached to a measurement subject and to detect pulses of the measurement subject and generate pulse wave signals;
• obtaining a pulse wave signal expressing a pulse by detecting a pulse of the measurement subject using the pulse wave sensor and storing the pulse wave signal in a storage;
• converting the pulse wave signal in a time-domain stored in the storage to a frequency spectrum in a frequency domain, the frequency spectrum having variable intensity with respect to frequency change and covering at least a predetermined total frequency range W, the predetermined total frequency range W covering possible pulse rates of a person;
• finding one or more frequency ranges in which the intensity of the frequency spectrum exceeds a first threshold;
• determining whether or not a percentage of the one or more frequency ranges occupied within the predetermined total frequency range W is less than a second threshold;
• determining that the measurement subject is at rest when (i) an exceeding frequency range within the predetermined total frequency range W is found, and when (ii) a ratio of width of the exceeding frequency range with respect to a width of the total frequency range W is found to be less than the second threshold;
• and
• determining the measurement subject's at-rest pulse rate when the measurement subject is determined to be at rest.

A device for determining a rest state comprising:

• a pulse wave sensor configured to be attached to a measurement subject and to detect pulses of the measurement subject and generate pulse wave signals;
• a storage;
• a processor, and
• a non-transitory computer-usable medium having computer readable instructions stored on the processor that, when executed by the processor, causes the processor to perform operations for controlling the device, the operations comprising:
• obtaining a pulse wave signal expressing a pulse by detecting a pulse of the measurement subject using the pulse wave sensor;
• storing the pulse wave signal in the storage;
• converting the pulse wave signal in a time-domain stored in the storage to a frequency spectrum in a frequency domain, the frequency spectrum having variable intensity with respect to frequency change and covering at least a predetermined total frequency range W, the predetermined total frequency range W covering possible pulse rates of a person;
• finding one or more frequency ranges in which the intensity of the frequency spectrum exceeds a first threshold;
• determining whether or not a percentage of the one or more frequency ranges occupied within the predetermined total frequency range W is less than a second threshold;
• determining that the measurement subject is at rest when (i) an exceeding frequency range within the predetermined total frequency range W is found, and when (ii) a ratio of a width of the exceeding frequency range with respect to a width of the total frequency range W is found to be less than the second threshold;
• and
• determining the measurement subject's at-rest pulse rate when the measurement subject is determined to be at rest.