Reduced heart rate variability during sleep in long-duration spaceflight
Limited data are available to describe the regulation of heart rate (HR) during sleep in spaceflight. Sleep provides a stable supine baseline during preflight Earth recordings for comparison of heart rate variability (HRV) over a wide range of frequencies using both linear, complexity, and fractal i...
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| Veröffentlicht in: | American journal of physiology. Regulatory, integrative and comparative physiology integrative and comparative physiology, 2013-07, Vol.305 (2), p.R164-R170 |
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| container_title | American journal of physiology. Regulatory, integrative and comparative physiology |
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| creator | Xu, D Shoemaker, J K Blaber, A P Arbeille, P Fraser, K Hughson, R L |
| description | Limited data are available to describe the regulation of heart rate (HR) during sleep in spaceflight. Sleep provides a stable supine baseline during preflight Earth recordings for comparison of heart rate variability (HRV) over a wide range of frequencies using both linear, complexity, and fractal indicators. The current study investigated the effect of long-duration spaceflight on HR and HRV during sleep in seven astronauts aboard the International Space Station up to 6 mo. Measurements included electrocardiographic waveforms from Holter monitors and simultaneous movement records from accelerometers before, during, and after the flights. HR was unchanged inflight and elevated postflight [59.6 ± 8.9 beats per minute (bpm) compared with preflight 53.3 ± 7.3 bpm; P < 0.01]. Compared with preflight data, HRV indicators from both time domain and power spectral analysis methods were diminished inflight from ultralow to high frequencies and partially recovered to preflight levels after landing. During inflight and at postflight, complexity and fractal properties of HR were not different from preflight properties. Slow fluctuations ( |
| doi_str_mv | 10.1152/ajpregu.00423.2012 |
| format | Article |
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Sleep provides a stable supine baseline during preflight Earth recordings for comparison of heart rate variability (HRV) over a wide range of frequencies using both linear, complexity, and fractal indicators. The current study investigated the effect of long-duration spaceflight on HR and HRV during sleep in seven astronauts aboard the International Space Station up to 6 mo. Measurements included electrocardiographic waveforms from Holter monitors and simultaneous movement records from accelerometers before, during, and after the flights. HR was unchanged inflight and elevated postflight [59.6 ± 8.9 beats per minute (bpm) compared with preflight 53.3 ± 7.3 bpm; P < 0.01]. Compared with preflight data, HRV indicators from both time domain and power spectral analysis methods were diminished inflight from ultralow to high frequencies and partially recovered to preflight levels after landing. During inflight and at postflight, complexity and fractal properties of HR were not different from preflight properties. Slow fluctuations (<0.04 Hz) in HR presented moderate correlations with movements during sleep, partially accounting for the reduction in HRV. In summary, substantial reduction in HRV was observed with linear, but not with complexity and fractal, methods of analysis. These results suggest that periodic elements that influence regulation of HR through reflex mechanisms are altered during sleep in spaceflight but that underlying system complexity and fractal dynamics were not altered.</description><identifier>ISSN: 0363-6119</identifier><identifier>EISSN: 1522-1490</identifier><identifier>DOI: 10.1152/ajpregu.00423.2012</identifier><identifier>PMID: 23637139</identifier><identifier>CODEN: AJPRDO</identifier><language>eng</language><publisher>United States: American Physiological Society</publisher><subject>Adult ; Astronauts ; Blood Pressure - physiology ; Electrocardiography ; Female ; Heart rate ; Heart Rate - physiology ; Humans ; Male ; Middle Aged ; Sleep ; Sleep - physiology ; Space exploration ; Space Flight ; Weightlessness</subject><ispartof>American journal of physiology. 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Regulatory, integrative and comparative physiology</title><addtitle>Am J Physiol Regul Integr Comp Physiol</addtitle><description>Limited data are available to describe the regulation of heart rate (HR) during sleep in spaceflight. Sleep provides a stable supine baseline during preflight Earth recordings for comparison of heart rate variability (HRV) over a wide range of frequencies using both linear, complexity, and fractal indicators. The current study investigated the effect of long-duration spaceflight on HR and HRV during sleep in seven astronauts aboard the International Space Station up to 6 mo. Measurements included electrocardiographic waveforms from Holter monitors and simultaneous movement records from accelerometers before, during, and after the flights. HR was unchanged inflight and elevated postflight [59.6 ± 8.9 beats per minute (bpm) compared with preflight 53.3 ± 7.3 bpm; P < 0.01]. Compared with preflight data, HRV indicators from both time domain and power spectral analysis methods were diminished inflight from ultralow to high frequencies and partially recovered to preflight levels after landing. During inflight and at postflight, complexity and fractal properties of HR were not different from preflight properties. Slow fluctuations (<0.04 Hz) in HR presented moderate correlations with movements during sleep, partially accounting for the reduction in HRV. In summary, substantial reduction in HRV was observed with linear, but not with complexity and fractal, methods of analysis. These results suggest that periodic elements that influence regulation of HR through reflex mechanisms are altered during sleep in spaceflight but that underlying system complexity and fractal dynamics were not altered.</description><subject>Adult</subject><subject>Astronauts</subject><subject>Blood Pressure - physiology</subject><subject>Electrocardiography</subject><subject>Female</subject><subject>Heart rate</subject><subject>Heart Rate - physiology</subject><subject>Humans</subject><subject>Male</subject><subject>Middle Aged</subject><subject>Sleep</subject><subject>Sleep - physiology</subject><subject>Space exploration</subject><subject>Space Flight</subject><subject>Weightlessness</subject><issn>0363-6119</issn><issn>1522-1490</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2013</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNpdkE1Lw0AQhhdRbK3-AQ-y4MVL6s5-pTlKUSsUBNHzskkm7ZY0ibuJ0H_v1lYPngZmnndmeAi5BjYFUPzebjqPq2HKmORiyhnwEzKOA56AzNgpGTOhRaIBshG5CGHDIiikOCcjHgcpiGxMFm9YDgWWdI3W99TbHumX9c7mrnb9jpaDd82Khhqxo66hdduskti0vWsbGjpbYFW71bq_JGeVrQNeHeuEfDw9vs8XyfL1-WX-sEwKkaV9ojGdSSt1wTMFJXKRamFVXlU5KypuKwE6Z1qpmbA6U1KqVGOpUgSNACVDMSF3h72dbz8HDL3ZulBgXdsG2yEYkIxpLpSWEb39h27awTfxu0gB8CyNhyLFD1Th2xA8Vqbzbmv9zgAze8_m6Nn8eDZ7zzF0c1w95Fss_yK_YsU3Kip5iA</recordid><startdate>20130715</startdate><enddate>20130715</enddate><creator>Xu, D</creator><creator>Shoemaker, J K</creator><creator>Blaber, A P</creator><creator>Arbeille, P</creator><creator>Fraser, K</creator><creator>Hughson, R L</creator><general>American Physiological Society</general><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7QP</scope><scope>7QR</scope><scope>7TS</scope><scope>7U7</scope><scope>8FD</scope><scope>C1K</scope><scope>FR3</scope><scope>P64</scope><scope>7X8</scope></search><sort><creationdate>20130715</creationdate><title>Reduced heart rate variability during sleep in long-duration spaceflight</title><author>Xu, D ; Shoemaker, J K ; Blaber, A P ; Arbeille, P ; Fraser, K ; Hughson, R L</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c397t-6e784a46c2951de23763a5bffb0cf2af316b065583a69544576ed57e16e11d0e3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2013</creationdate><topic>Adult</topic><topic>Astronauts</topic><topic>Blood Pressure - physiology</topic><topic>Electrocardiography</topic><topic>Female</topic><topic>Heart rate</topic><topic>Heart Rate - physiology</topic><topic>Humans</topic><topic>Male</topic><topic>Middle Aged</topic><topic>Sleep</topic><topic>Sleep - physiology</topic><topic>Space exploration</topic><topic>Space Flight</topic><topic>Weightlessness</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Xu, D</creatorcontrib><creatorcontrib>Shoemaker, J K</creatorcontrib><creatorcontrib>Blaber, A P</creatorcontrib><creatorcontrib>Arbeille, P</creatorcontrib><creatorcontrib>Fraser, K</creatorcontrib><creatorcontrib>Hughson, R L</creatorcontrib><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>Calcium & Calcified Tissue Abstracts</collection><collection>Chemoreception Abstracts</collection><collection>Physical Education Index</collection><collection>Toxicology Abstracts</collection><collection>Technology Research Database</collection><collection>Environmental Sciences and Pollution Management</collection><collection>Engineering Research Database</collection><collection>Biotechnology and BioEngineering Abstracts</collection><collection>MEDLINE - Academic</collection><jtitle>American journal of physiology. Regulatory, integrative and comparative physiology</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Xu, D</au><au>Shoemaker, J K</au><au>Blaber, A P</au><au>Arbeille, P</au><au>Fraser, K</au><au>Hughson, R L</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Reduced heart rate variability during sleep in long-duration spaceflight</atitle><jtitle>American journal of physiology. Regulatory, integrative and comparative physiology</jtitle><addtitle>Am J Physiol Regul Integr Comp Physiol</addtitle><date>2013-07-15</date><risdate>2013</risdate><volume>305</volume><issue>2</issue><spage>R164</spage><epage>R170</epage><pages>R164-R170</pages><issn>0363-6119</issn><eissn>1522-1490</eissn><coden>AJPRDO</coden><abstract>Limited data are available to describe the regulation of heart rate (HR) during sleep in spaceflight. Sleep provides a stable supine baseline during preflight Earth recordings for comparison of heart rate variability (HRV) over a wide range of frequencies using both linear, complexity, and fractal indicators. The current study investigated the effect of long-duration spaceflight on HR and HRV during sleep in seven astronauts aboard the International Space Station up to 6 mo. Measurements included electrocardiographic waveforms from Holter monitors and simultaneous movement records from accelerometers before, during, and after the flights. HR was unchanged inflight and elevated postflight [59.6 ± 8.9 beats per minute (bpm) compared with preflight 53.3 ± 7.3 bpm; P < 0.01]. Compared with preflight data, HRV indicators from both time domain and power spectral analysis methods were diminished inflight from ultralow to high frequencies and partially recovered to preflight levels after landing. During inflight and at postflight, complexity and fractal properties of HR were not different from preflight properties. Slow fluctuations (<0.04 Hz) in HR presented moderate correlations with movements during sleep, partially accounting for the reduction in HRV. In summary, substantial reduction in HRV was observed with linear, but not with complexity and fractal, methods of analysis. These results suggest that periodic elements that influence regulation of HR through reflex mechanisms are altered during sleep in spaceflight but that underlying system complexity and fractal dynamics were not altered.</abstract><cop>United States</cop><pub>American Physiological Society</pub><pmid>23637139</pmid><doi>10.1152/ajpregu.00423.2012</doi></addata></record> |
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| source | MEDLINE; American Physiological Society; EZB-FREE-00999 freely available EZB journals; Alma/SFX Local Collection |
| subjects | Adult Astronauts Blood Pressure - physiology Electrocardiography Female Heart rate Heart Rate - physiology Humans Male Middle Aged Sleep Sleep - physiology Space exploration Space Flight Weightlessness |
| title | Reduced heart rate variability during sleep in long-duration spaceflight |
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