{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,5]],"date-time":"2026-08-05T06:52:59Z","timestamp":1785912779614,"version":"3.56.0"},"reference-count":31,"publisher":"Wiley","issue":"2","license":[{"start":{"date-parts":[[2023,1,26]],"date-time":"2023-01-26T00:00:00Z","timestamp":1674691200000},"content-version":"vor","delay-in-days":25,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["physoc.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Physiological Reports"],"published-print":{"date-parts":[[2023,1]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Spectral analysis of heart rate variability (HRV) is widely used as a non\u2010invasive method to assess the cardiovascular autonomic function. Of the two main frequency components of HRV, namely low\u2010frequency (LF, 0.04\u20130.15\u2009Hz) and high\u2010frequency (HF, 0.15\u20130.4\u00a0Hz) components, it is generally accepted that the HF power reflects modulation of heart rate which is mediated by cardiac parasympathetic (vagal) nerve activity. In contrast, the origin and functional correlates of the LF component are still controversial. Although several lines of evidence have indicated a close correlation between LF power and the baroreflex modulation of autonomic outflows, the detailed mechanisms underlying the genesis of the LF component remain unclarified. In this study, we conducted an ultra\u2010short\u2010term (UST) spectral analysis of R\u2010R interval (RRI) time series using Fast Fourier Transform (FFT) with 5\u2010 and 25\u2010s windows to clarify the temporal relationships among transient changes in the RRI and, LF and HF powers in healthy subjects. We found that during active standing, transient RRI increases occurred sporadically. The UST spectral analysis revealed that this RRI increase was associated with a simultaneous increase in HF power which was closely linked to the prominent LF power increase. These results indicate that during active standing, increases in LF and HF powers occur simultaneously, and they may reflect enhanced cardiac vagal activity which generates transient bradycardia.<\/jats:p>","DOI":"10.14814\/phy2.15557","type":"journal-article","created":{"date-parts":[[2023,1,27]],"date-time":"2023-01-27T01:29:00Z","timestamp":1674782940000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":21,"title":["Temporal relationships among changes in the <scp>RR<\/scp>\u2010interval and the powers of the low\u2010 and high\u2010frequency components of heart rate variability in normal subjects"],"prefix":"10.14814","volume":"11","author":[{"given":"Yuji","family":"Yokobori","sequence":"first","affiliation":[{"name":"Department of Healthcare Informatics Takasaki University of Health and Welfare  Takasaki Gunma Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hayato","family":"Nakane","sequence":"additional","affiliation":[{"name":"Department of Healthcare Informatics Takasaki University of Health and Welfare  Takasaki Gunma Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chirika","family":"Uehara","sequence":"additional","affiliation":[{"name":"Department of Healthcare Informatics Takasaki University of Health and Welfare  Takasaki Gunma Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Toru","family":"Nagasawa","sequence":"additional","affiliation":[{"name":"Department of Healthcare Informatics Takasaki University of Health and Welfare  Takasaki Gunma Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Satoshi","family":"Mitsuyama","sequence":"additional","affiliation":[{"name":"Department of Healthcare Informatics Takasaki University of Health and Welfare  Takasaki Gunma 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