| 摘要 |
An instrument for measuring physiological characteristics of a living organism based upon the monitoring of the respiratory sinus arrhythmia senses a subject's heartbeat and senses beginning of inspiration and expiration in the subject's respiratory cycles. Instantaneous heart rate values are derived for each heartbeat. A time value is stored for each heartbeat, and from those time values the temporal location of each instantaneous heart rate within the respiratory cycle of the patient is determined. Based upon the time values and the instantaneous heart rate values corresponding to those time values, measurement values which indicate a characteristic of the subject's cardiovascular and/or cardiopulmonary systems are derived. Corrections for the effects of mean heart rate, respiratory rate, respiratory volume and respiratory flow rate, and time of day of the test, are provided.
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