{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2023,10,23]],"date-time":"2023-10-23T05:04:30Z","timestamp":1698037470492},"reference-count":12,"publisher":"Wiley","issue":"4","license":[{"start":{"date-parts":[[2007,3,21]],"date-time":"2007-03-21T00:00:00Z","timestamp":1174435200000},"content-version":"vor","delay-in-days":6653,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Systems &amp;amp; Computers in Japan"],"published-print":{"date-parts":[[1989,1]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>The heartbeat rhythm is affected by various factors such as respiration, blood pressure, body temperature regulation, and arrhythmia. Other external factors also affect the variation of the heart\u2010rate with various frequency components. The heart\u2010rate variability (HRV) has been used as an index for the heartbeat variation, but it represents the variation caused by a large number of factors through a single measure, since it is determined from the overall time\u2010series of heartbeats. Consequently, it does not have a clear interpretation and can represent only macroscopic information. If an arbitrary frequency component can be extracted from the heartbeat rhythm and HRV derived based on that component, a detailed and clear information will be obtained.<\/jats:p><jats:p>This paper proposes a method to extract a fluctuation component for an arbitrary frequency. The autoregressive (AR) model is applied to the time\u2010series of heartbeats, and the power spectrum density function is decomposed based on the characteristic equation of the AR model. HRV for arbitrary frequency component is examined. The time\u2010series of heartbeat is decomposed into frequency components. A time\u2010series is generated by simulation with the same statistical property as the decomposed component, and is analyzed to verify the effectiveness. The method is applied to the exercise ECG for analysis. As a result, the usefulness of the method was demonstrated by indicating that the information which cannot be obtained from the overall time\u2010series can be obtained from the generated series having only a decomposed component.<\/jats:p>","DOI":"10.1002\/scj.4690200409","type":"journal-article","created":{"date-parts":[[2007,7,7]],"date-time":"2007-07-07T17:37:28Z","timestamp":1183829848000},"page":"89-97","source":"Crossref","is-referenced-by-count":0,"title":["Quantification of the heartbeat rhythm using characteristic equation of autoregressive model of R\u2013R intervals in ECG"],"prefix":"10.1002","volume":"20","author":[{"given":"Kazuyuki","family":"Takata","sequence":"first","affiliation":[]},{"given":"Yosaku","family":"Watanabe","sequence":"additional","affiliation":[]},{"given":"Kiyoko","family":"Yokoyama","sequence":"additional","affiliation":[]}],"member":"311","published-online":{"date-parts":[[2007,3,21]]},"reference":[{"key":"e_1_2_1_2_2","volume-title":"The Study of Heart\u2010Rate Variability","author":"Kitney R. I.","year":"1980"},{"key":"e_1_2_1_3_2","doi-asserted-by":"publisher","DOI":"10.1080\/00140137308924479"},{"key":"e_1_2_1_4_2","doi-asserted-by":"publisher","DOI":"10.1126\/science.6166045"},{"issue":"3","key":"e_1_2_1_5_2","first-page":"194","article-title":"Time\u2010series analysis of R\u2010R interval variability during running load in man","volume":"22","author":"Takata K.","year":"1984","journal-title":"Jour. MEBE"},{"issue":"10","key":"e_1_2_1_6_2","first-page":"1233","article-title":"Time\u2010series analysis of the successive R\u2010R intervals during physical load","volume":"66","author":"Takata K.","journal-title":"Trans. (D), I.E.C.E."},{"issue":"2","key":"e_1_2_1_7_2","first-page":"103","article-title":"Heart\u2010rate variability of diabetes\u2014problems in diagnosis of autonomous nervous system","volume":"23","author":"Baba Kitazawa","journal-title":"Autonom. Nerv."},{"issue":"2","key":"e_1_2_1_8_2","first-page":"97","article-title":"Analysis of heart\u2010rate variability using autoregressive model and treadmill exercise ECG test","volume":"22","author":"Takata K.","year":"1984","journal-title":"Jour. MEBE"},{"issue":"5","key":"e_1_2_1_9_2","first-page":"1087","article-title":"Analysis of arrhythmic beats using autoregressive model","volume":"68","author":"Watanabe Y.","year":"1985","journal-title":"Trans. (D), I.E.C.E., Japan"},{"issue":"10","key":"e_1_2_1_10_2","first-page":"215","article-title":"Analysis of heart\u2010rate variability under white noise sounds using autoregressive model","volume":"106","author":"Takata K.","year":"1986","journal-title":"Trans. (D), I.E.E., Japan"},{"key":"e_1_2_1_11_2","volume-title":"Statistical Analysis and Control of Dynamical System","author":"Akaike","year":"1974"},{"key":"e_1_2_1_12_2","volume-title":"Time\u2010series Analysis, Forecasting and Control","author":"Box G. E. P.","year":"1970"},{"key":"e_1_2_1_13_2","volume-title":"Running and Brain","author":"Kubota K.","year":"1982"}],"container-title":["Systems and Computers in Japan"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/api.wiley.com\/onlinelibrary\/tdm\/v1\/articles\/10.1002%2Fscj.4690200409","content-type":"unspecified","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/pdf\/10.1002\/scj.4690200409","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2023,10,22]],"date-time":"2023-10-22T13:17:38Z","timestamp":1697980658000},"score":1,"resource":{"primary":{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/10.1002\/scj.4690200409"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[1989,1]]},"references-count":12,"journal-issue":{"issue":"4","published-print":{"date-parts":[[1989,1]]}},"alternative-id":["10.1002\/scj.4690200409"],"URL":"https:\/\/doi.org\/10.1002\/scj.4690200409","archive":["Portico"],"relation":{},"ISSN":["0882-1666","1520-684X"],"issn-type":[{"value":"0882-1666","type":"print"},{"value":"1520-684X","type":"electronic"}],"subject":[],"published":{"date-parts":[[1989,1]]}}}