{"id":"https://openalex.org/W2000659208","doi":"https://doi.org/10.1161/01.cir.98.6.547","title":"Mechanisms Underlying Very-Low-Frequency RR-Interval Oscillations in Humans","display_name":"Mechanisms Underlying Very-Low-Frequency RR-Interval Oscillations in Humans","publication_year":1998,"publication_date":"1998-08-11","ids":{"openalex":"https://openalex.org/W2000659208","doi":"https://doi.org/10.1161/01.cir.98.6.547","mag":"2000659208","pmid":"https://pubmed.ncbi.nlm.nih.gov/9714112"},"language":"en","primary_location":{"id":"doi:10.1161/01.cir.98.6.547","doi":"https://doi.org/10.1161/01.cir.98.6.547","is_oa":false,"landing_page_url":"https://doi.org/10.1161/01.cir.98.6.547","pdf_url":null,"source":{"id":"https://openalex.org/S116251202","display_name":"Circulation","issn_l":"0009-7322","issn":["0009-7322","1524-4539"],"is_oa":false,"is_in_doaj":false,"is_core":true,"listed_in":["anvur-scientific","cwts-core","dongbi-a","doyens","jufo-3","ki-jl-3","medline","norway-2","poland-200","russia-white-list-1","vabb-shw"],"host_organization":"https://openalex.org/P4310315671","host_organization_name":"Lippincott Williams & Wilkins","host_organization_lineage":["https://openalex.org/P4310315671","https://openalex.org/P4310318547"],"host_organization_lineage_names":["Lippincott Williams & Wilkins","Wolters Kluwer"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Circulation","raw_type":"journal-article"},"volume":null,"type":"article","indexed_in":["crossref","pubmed"],"open_access":{"is_oa":false,"oa_status":"closed","oa_url":null,"any_repository_has_fulltext":false},"authorships":[{"author_position":"first","author":{"id":"https://openalex.org/A5022205827","display_name":"J. Andrew Taylor","orcid":"https://orcid.org/0000-0003-2802-4330","observed_orcids":["https://orcid.org/0000-0003-2802-4330"]},"institutions":[{"id":"https://openalex.org/I184840846","display_name":"Virginia Commonwealth University","ror":"https://ror.org/02nkdxk79","country_code":"US","type":"education","lineage":["https://openalex.org/I184840846"]},{"id":"https://openalex.org/I2801770128","display_name":"Hunter Holmes McGuire VA Medical Center","ror":"https://ror.org/04fp78s33","country_code":"US","type":"healthcare","lineage":["https://openalex.org/I1322918889","https://openalex.org/I2799886695","https://openalex.org/I2801770128","https://openalex.org/I4210159720"]},{"id":"https://openalex.org/I72019824","display_name":"Virginia Commonwealth University Medical Center","ror":"https://ror.org/057xmsr27","country_code":"US","type":"healthcare","lineage":["https://openalex.org/I72019824"]}],"countries":["US"],"is_corresponding":false,"raw_author_name":"J. Andrew Taylor","raw_affiliation_strings":["From the Departments of Internal Medicine and Physiology, Hunter Holmes McGuire Department of Veterans Affairs Medical Center, and Medical College of Virginia, Virginia Commonwealth University, Richmond"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"From the Departments of Internal Medicine and Physiology, Hunter Holmes McGuire Department of Veterans Affairs Medical Center, and Medical College of Virginia, Virginia Commonwealth University, Richmond","institution_ids":["https://openalex.org/I184840846","https://openalex.org/I2801770128","https://openalex.org/I72019824"]}]},{"author_position":"middle","author":{"id":null,"display_name":"Deborah L. Carr","orcid":null,"observed_orcids":[]},"institutions":[{"id":"https://openalex.org/I184840846","display_name":"Virginia Commonwealth University","ror":"https://ror.org/02nkdxk79","country_code":"US","type":"education","lineage":["https://openalex.org/I184840846"]},{"id":"https://openalex.org/I2801770128","display_name":"Hunter Holmes McGuire VA Medical Center","ror":"https://ror.org/04fp78s33","country_code":"US","type":"healthcare","lineage":["https://openalex.org/I1322918889","https://openalex.org/I2799886695","https://openalex.org/I2801770128","https://openalex.org/I4210159720"]},{"id":"https://openalex.org/I72019824","display_name":"Virginia Commonwealth University Medical Center","ror":"https://ror.org/057xmsr27","country_code":"US","type":"healthcare","lineage":["https://openalex.org/I72019824"]}],"countries":["US"],"is_corresponding":false,"raw_author_name":"Deborah L. Carr","raw_affiliation_strings":["From the Departments of Internal Medicine and Physiology, Hunter Holmes McGuire Department of Veterans Affairs Medical Center, and Medical College of Virginia, Virginia Commonwealth University, Richmond"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"From the Departments of Internal Medicine and Physiology, Hunter Holmes McGuire Department of Veterans Affairs Medical Center, and Medical College of Virginia, Virginia Commonwealth University, Richmond","institution_ids":["https://openalex.org/I184840846","https://openalex.org/I2801770128","https://openalex.org/I72019824"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5102859418","display_name":"Christopher W. Myers","orcid":"https://orcid.org/0000-0003-0556-5935","observed_orcids":["https://orcid.org/0000-0003-0556-5935"]},"institutions":[{"id":"https://openalex.org/I184840846","display_name":"Virginia Commonwealth University","ror":"https://ror.org/02nkdxk79","country_code":"US","type":"education","lineage":["https://openalex.org/I184840846"]},{"id":"https://openalex.org/I2801770128","display_name":"Hunter Holmes McGuire VA Medical Center","ror":"https://ror.org/04fp78s33","country_code":"US","type":"healthcare","lineage":["https://openalex.org/I1322918889","https://openalex.org/I2799886695","https://openalex.org/I2801770128","https://openalex.org/I4210159720"]},{"id":"https://openalex.org/I72019824","display_name":"Virginia Commonwealth University Medical Center","ror":"https://ror.org/057xmsr27","country_code":"US","type":"healthcare","lineage":["https://openalex.org/I72019824"]}],"countries":["US"],"is_corresponding":false,"raw_author_name":"Christopher W. Myers","raw_affiliation_strings":["From the Departments of Internal Medicine and Physiology, Hunter Holmes McGuire Department of Veterans Affairs Medical Center, and Medical College of Virginia, Virginia Commonwealth University, Richmond"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"From the Departments of Internal Medicine and Physiology, Hunter Holmes McGuire Department of Veterans Affairs Medical Center, and Medical College of Virginia, Virginia Commonwealth University, Richmond","institution_ids":["https://openalex.org/I184840846","https://openalex.org/I2801770128","https://openalex.org/I72019824"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5023540674","display_name":"Dwain L. Eckberg","orcid":"https://orcid.org/0000-0003-3790-871X","observed_orcids":["https://orcid.org/0000-0003-3790-871X"]},"institutions":[{"id":"https://openalex.org/I184840846","display_name":"Virginia Commonwealth University","ror":"https://ror.org/02nkdxk79","country_code":"US","type":"education","lineage":["https://openalex.org/I184840846"]},{"id":"https://openalex.org/I2801770128","display_name":"Hunter Holmes McGuire VA Medical Center","ror":"https://ror.org/04fp78s33","country_code":"US","type":"healthcare","lineage":["https://openalex.org/I1322918889","https://openalex.org/I2799886695","https://openalex.org/I2801770128","https://openalex.org/I4210159720"]},{"id":"https://openalex.org/I72019824","display_name":"Virginia Commonwealth University Medical Center","ror":"https://ror.org/057xmsr27","country_code":"US","type":"healthcare","lineage":["https://openalex.org/I72019824"]}],"countries":["US"],"is_corresponding":false,"raw_author_name":"Dwain L. Eckberg","raw_affiliation_strings":["From the Departments of Internal Medicine and Physiology, Hunter Holmes McGuire Department of Veterans Affairs Medical Center, and Medical College of Virginia, Virginia Commonwealth University, Richmond"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"From the Departments of Internal Medicine and Physiology, Hunter Holmes McGuire Department of Veterans Affairs Medical Center, and Medical College of Virginia, Virginia Commonwealth University, Richmond","institution_ids":["https://openalex.org/I184840846","https://openalex.org/I2801770128","https://openalex.org/I72019824"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":3,"corresponding_author_ids":[],"corresponding_institution_ids":[],"apc_list":null,"apc_paid":null,"fwci":7.3117,"has_fulltext":false,"cited_by_count":660,"citation_normalized_percentile":{"value":0.97503342,"is_in_top_1_percent":false,"is_in_top_10_percent":true},"cited_by_percentile_year":{"min":99,"max":100},"biblio":{"volume":"98","issue":"6","first_page":"547","last_page":"555"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T10745","display_name":"Heart Rate Variability and Autonomic Control","score":0.9994999766349792,"subfield":{"id":"https://openalex.org/subfields/2705","display_name":"Cardiology and Cardiovascular Medicine"},"field":{"id":"https://openalex.org/fields/27","display_name":"Medicine"},"domain":{"id":"https://openalex.org/domains/4","display_name":"Health Sciences"}},"topics":[{"id":"https://openalex.org/T10745","display_name":"Heart Rate Variability and Autonomic Control","score":0.9994999766349792,"subfield":{"id":"https://openalex.org/subfields/2705","display_name":"Cardiology and Cardiovascular Medicine"},"field":{"id":"https://openalex.org/fields/27","display_name":"Medicine"},"domain":{"id":"https://openalex.org/domains/4","display_name":"Health Sciences"}},{"id":"https://openalex.org/T10217","display_name":"Cardiac electrophysiology and arrhythmias","score":9.999999747378752e-05,"subfield":{"id":"https://openalex.org/subfields/2705","display_name":"Cardiology and Cardiovascular Medicine"},"field":{"id":"https://openalex.org/fields/27","display_name":"Medicine"},"domain":{"id":"https://openalex.org/domains/4","display_name":"Health Sciences"}},{"id":"https://openalex.org/T11456","display_name":"Neuroscience of respiration and sleep","score":0.0,"subfield":{"id":"https://openalex.org/subfields/2807","display_name":"Endocrine and Autonomic Systems"},"field":{"id":"https://openalex.org/fields/28","display_name":"Neuroscience"},"domain":{"id":"https://openalex.org/domains/1","display_name":"Life Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/heart-rate-variability","display_name":"heart rate variability","score":0.8220000267028809},{"id":"https://openalex.org/keywords/parasympathetic-nervous-system","display_name":"parasympathetic nervous system","score":0.8820000290870667},{"id":"https://openalex.org/keywords/vagal-outflow","display_name":"vagal outflow","score":0.7009999752044678},{"id":"https://openalex.org/keywords/sympathetic-nervous-system","display_name":"sympathetic nervous system","score":0.8809999823570251},{"id":"https://openalex.org/keywords/renin-angiotensin-aldosterone-system","display_name":"renin-angiotensin-aldosterone system","score":0.984000027179718},{"id":"https://openalex.org/keywords/atropine","display_name":"atropine","score":0.6880000233650208},{"id":"https://openalex.org/keywords/atenolol","display_name":"atenolol","score":0.9610000252723694},{"id":"https://openalex.org/keywords/enalaprilat","display_name":"enalaprilat","score":0.9779999852180481},{"id":"https://openalex.org/keywords/autonomic-blockade","display_name":"autonomic blockade","score":0.8420000076293945},{"id":"https://openalex.org/keywords/respiratory-rate","display_name":"respiratory rate","score":0.4449999928474426},{"id":"https://openalex.org/keywords/autonomic-regulation-of-heart-rate","display_name":"autonomic regulation of heart rate","score":0.5509999990463257}],"concepts":[{"id":"https://openalex.org/C71924100","wikidata":"https://www.wikidata.org/wiki/Q11190","display_name":"Medicine","level":0,"score":0.771801233291626},{"id":"https://openalex.org/C2776525901","wikidata":"https://www.wikidata.org/wiki/Q411325","display_name":"Atenolol","level":3,"score":0.7314929962158203},{"id":"https://openalex.org/C125567185","wikidata":"https://www.wikidata.org/wiki/Q3267428","display_name":"Supine position","level":2,"score":0.5704208612442017},{"id":"https://openalex.org/C2778468042","wikidata":"https://www.wikidata.org/wiki/Q273976","display_name":"Blockade","level":3,"score":0.5501837730407715},{"id":"https://openalex.org/C2775859210","wikidata":"https://www.wikidata.org/wiki/Q26272","display_name":"Atropine","level":2,"score":0.5492043495178223},{"id":"https://openalex.org/C42219234","wikidata":"https://www.wikidata.org/wiki/Q131130","display_name":"Anesthesia","level":1,"score":0.5338346362113953},{"id":"https://openalex.org/C10928738","wikidata":"https://www.wikidata.org/wiki/Q1195426","display_name":"Vagal tone","level":5,"score":0.47190648317337036},{"id":"https://openalex.org/C164705383","wikidata":"https://www.wikidata.org/wiki/Q10379","display_name":"Cardiology","level":1,"score":0.45097818970680237},{"id":"https://openalex.org/C126322002","wikidata":"https://www.wikidata.org/wiki/Q11180","display_name":"Internal medicine","level":1,"score":0.4502246081829071},{"id":"https://openalex.org/C71635504","wikidata":"https://www.wikidata.org/wiki/Q933954","display_name":"Heart rate variability","level":4,"score":0.3735325336456299},{"id":"https://openalex.org/C2777953023","wikidata":"https://www.wikidata.org/wiki/Q1073121","display_name":"Heart rate","level":3,"score":0.27319246530532837},{"id":"https://openalex.org/C84393581","wikidata":"https://www.wikidata.org/wiki/Q82642","display_name":"Blood pressure","level":2,"score":0.22252273559570312},{"id":"https://openalex.org/C170493617","wikidata":"https://www.wikidata.org/wiki/Q208467","display_name":"Receptor","level":2,"score":0.0}],"mesh":[{"descriptor_ui":"D000328","descriptor_name":"Adult","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D000806","descriptor_name":"Angiotensin-Converting Enzyme Inhibitors","qualifier_ui":"Q000494","qualifier_name":"pharmacology","is_major_topic":false},{"descriptor_ui":"D001794","descriptor_name":"Blood Pressure","qualifier_ui":"Q000187","qualifier_name":"drug effects","is_major_topic":false},{"descriptor_ui":"D001794","descriptor_name":"Blood Pressure","qualifier_ui":"Q000502","qualifier_name":"physiology","is_major_topic":false},{"descriptor_ui":"D004562","descriptor_name":"Electrocardiography","qualifier_ui":null,"qualifier_name":null,"is_major_topic":true},{"descriptor_ui":"D005260","descriptor_name":"Female","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D006339","descriptor_name":"Heart Rate","qualifier_ui":"Q000187","qualifier_name":"drug effects","is_major_topic":false},{"descriptor_ui":"D006339","descriptor_name":"Heart Rate","qualifier_ui":"Q000502","qualifier_name":"physiology","is_major_topic":true},{"descriptor_ui":"D006801","descriptor_name":"Humans","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D008297","descriptor_name":"Male","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D009991","descriptor_name":"Oscillometry","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D010276","descriptor_name":"Parasympatholytics","qualifier_ui":"Q000494","qualifier_name":"pharmacology","is_major_topic":false},{"descriptor_ui":"D012119","descriptor_name":"Respiration","qualifier_ui":"Q000187","qualifier_name":"drug effects","is_major_topic":false},{"descriptor_ui":"D012119","descriptor_name":"Respiration","qualifier_ui":"Q000502","qualifier_name":"physiology","is_major_topic":false},{"descriptor_ui":"D013990","descriptor_name":"Tidal Volume","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D016683","descriptor_name":"Supine Position","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D018475","descriptor_name":"Head-Down Tilt","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false}],"locations_count":2,"locations":[{"id":"doi:10.1161/01.cir.98.6.547","doi":"https://doi.org/10.1161/01.cir.98.6.547","is_oa":false,"landing_page_url":"https://doi.org/10.1161/01.cir.98.6.547","pdf_url":null,"source":{"id":"https://openalex.org/S116251202","display_name":"Circulation","issn_l":"0009-7322","issn":["0009-7322","1524-4539"],"is_oa":false,"is_in_doaj":false,"is_core":true,"listed_in":["anvur-scientific","cwts-core","dongbi-a","doyens","jufo-3","ki-jl-3","medline","norway-2","poland-200","russia-white-list-1","vabb-shw"],"host_organization":"https://openalex.org/P4310315671","host_organization_name":"Lippincott Williams & Wilkins","host_organization_lineage":["https://openalex.org/P4310315671","https://openalex.org/P4310318547"],"host_organization_lineage_names":["Lippincott Williams & Wilkins","Wolters Kluwer"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Circulation","raw_type":"journal-article"},{"id":"pmid:9714112","doi":null,"is_oa":false,"landing_page_url":"https://pubmed.ncbi.nlm.nih.gov/9714112","pdf_url":null,"source":{"id":"https://openalex.org/S4306525036","display_name":"PubMed","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"listed_in":[],"host_organization":"https://openalex.org/I1299303238","host_organization_name":"National Institutes of Health","host_organization_lineage":["https://openalex.org/I1299303238"],"host_organization_lineage_names":[],"type":"repository"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Circulation","raw_type":"Journal Article"}],"best_oa_location":null,"sustainable_development_goals":[{"display_name":"Good health and well-being","id":"https://metadata.un.org/sdg/3","score":0.9940000176429749}],"study_designs":[],"awards":[{"id":"https://openalex.org/G3072492611","display_name":null,"funder_award_id":"HL-22296","funder_id":"https://openalex.org/F4320337338","funder_display_name":"National Heart, Lung, and Blood Institute"},{"id":"https://openalex.org/G3232199949","display_name":null,"funder_award_id":"AG05636-01","funder_id":"https://openalex.org/F4320337337","funder_display_name":"National Institute on Aging"},{"id":"https://openalex.org/G3333209182","display_name":"PATHOPHYSIOLOGY OF CATASTROPHIC HUMAN DYSRHYTHMIAS","funder_award_id":"5r01hl022296-16","funder_id":"https://openalex.org/F4320332161","funder_display_name":"National Institutes of Health"},{"id":"https://openalex.org/G7975855615","display_name":"AGE EFFECT ON BAROREFLEX CONTROL OF AUTONOMIC OUTFLOW","funder_award_id":"1f32ag005636-01","funder_id":"https://openalex.org/F4320332161","funder_display_name":"National Institutes of Health"}],"funders":[{"id":"https://openalex.org/F4320332161","display_name":"National Institutes of Health","ror":"https://ror.org/01cwqze88"},{"id":"https://openalex.org/F4320337337","display_name":"National Institute on Aging","ror":"https://ror.org/049v75w11"},{"id":"https://openalex.org/F4320337338","display_name":"National Heart, Lung, and Blood Institute","ror":"https://ror.org/012pb6c26"}],"has_content":{"pdf":false,"grobid_xml":false},"content_urls":null,"referenced_works_count":42,"referenced_works":["https://openalex.org/W205039318","https://openalex.org/W600238740","https://openalex.org/W1854129652","https://openalex.org/W1964061197","https://openalex.org/W1970159191","https://openalex.org/W2016250327","https://openalex.org/W2024256212","https://openalex.org/W2028355227","https://openalex.org/W2028832333","https://openalex.org/W2037279720","https://openalex.org/W2038476114","https://openalex.org/W2039157398","https://openalex.org/W2042838275","https://openalex.org/W2049178156","https://openalex.org/W2050057188","https://openalex.org/W2056683707","https://openalex.org/W2061849116","https://openalex.org/W2065125125","https://openalex.org/W2065781997","https://openalex.org/W2076386730","https://openalex.org/W2088079069","https://openalex.org/W2092991372","https://openalex.org/W2106822551","https://openalex.org/W2112400936","https://openalex.org/W2112871374","https://openalex.org/W2137004877","https://openalex.org/W2138399442","https://openalex.org/W2141974904","https://openalex.org/W2168127542","https://openalex.org/W2170205460","https://openalex.org/W2190317876","https://openalex.org/W2203191247","https://openalex.org/W2268167454","https://openalex.org/W2340764994","https://openalex.org/W2415266548","https://openalex.org/W2416793131","https://openalex.org/W2433486128","https://openalex.org/W2605703230","https://openalex.org/W2727476309","https://openalex.org/W2798643531","https://openalex.org/W2995875879","https://openalex.org/W4237317557"],"related_works":["https://openalex.org/W1993368541","https://openalex.org/W3002277677","https://openalex.org/W2062618262","https://openalex.org/W2009525380","https://openalex.org/W7098387262","https://openalex.org/W2030622806","https://openalex.org/W1999639121","https://openalex.org/W1980010748","https://openalex.org/W1980806135","https://openalex.org/W2024673434"],"abstract_inverted_index":{"BACKGROUND:":[0],"Survival":[1],"of":[2,12,39,245,252,263],"post-myocardial":[3],"infarction":[4],"patients":[5],"is":[6,26],"related":[7],"inversely":[8],"to":[9,15,35,48,131,136,143],"their":[10],"levels":[11],"very-low-frequency":[13,49,183,216,222,253],"(0.003":[14,130],"0.03":[16,132],"Hz)":[17,86,145],"RR-interval":[18,50,124,157,176,212,237],"variability.":[19],"The":[20,194],"physiological":[21],"basis":[22],"for":[23],"such":[24],"oscillations":[25,256],"unclear.":[27],"In":[28],"our":[29],"study,":[30],"we":[31],"used":[32],"blocking":[33],"drugs":[34],"evaluate":[36],"potential":[37],"contributions":[38],"sympathetic":[40],"and":[41,44,64,76,87,108,113,140,214,234],"vagal":[42],"mechanisms":[43,265],"the":[45,72,186,229,243,249,260],"renin-angiotensin-aldosterone":[46,230],"system":[47],"variability":[51,213,217],"in":[52,74,185,266],"10":[53],"young":[54],"healthy":[55],"subjects.":[56],"METHODS":[57],"AND":[58],"RESULTS:":[59],"We":[60,119],"recorded":[61],"RR":[62],"intervals":[63],"arterial":[65],"pressures":[66],"during":[67,82],"three":[68],"separate":[69],"sessions,":[70],"with":[71,207],"patient":[73],"supine":[75,187],"40":[77],"degree":[78],"upright":[79,190],"tilt":[80],"positions,":[81],"20-minute":[83],"frequency":[84,162,175,236],"(0.25":[85],"tidal":[88],"volume-controlled":[89],"breathing":[90],"after":[91],"intravenous":[92],"injections:":[93],"saline":[94],"(control),":[95],"atenolol":[96,107],"(0.2":[97,142],"mg/kg,":[98,104,116],"beta-adrenergic":[99],"blockade),":[100,106,112],"atropine":[101,109],"sulfate":[102],"(0.04":[103],"parasympathetic":[105,201,246,264],"(complete":[110],"autonomic":[111],"enalaprilat":[114],"(0.02":[115],"ACE":[117,165],"blockade).":[118],"integrated":[120],"fast":[121],"Fourier":[122],"transform":[123],"spectral":[125],"power":[126,158,163,177,184],"at":[127],"very":[128],"low":[129,134,172,233],"Hz),":[133,139],"(0.05":[135],"0.":[137],"15":[138],"respiratory":[141,161,174,235],"0.3":[144],"frequencies.":[146],"Beta-adrenergic":[147],"blockade":[148,166],"had":[149,167],"no":[150,168],"significant":[151,169],"effect":[152,170],"on":[153,171,242],"very-low-":[154],"or":[155,173,206],"low-frequency":[156],"but":[159,178],"increased":[160,182],"2-fold.":[164],"modestly":[179],"(approximately":[180],"21%)":[181],"(but":[188],"not":[189],"tilt)":[191],"position":[192],"(P<0.05).":[193],"most":[195],"profound":[196],"effects":[197],"were":[198],"exerted":[199],"by":[200,218,228],"blockade:":[202],"Atropine,":[203],"given":[204],"alone":[205],"atenolol,":[208],"abolished":[209],"nearly":[210],"all":[211],"decreased":[215],"92%.":[219],"CONCLUSIONS:":[220],"Although":[221],"heart":[223,254],"period":[224,255],"rhythms":[225],"are":[226],"influenced":[227],"system,":[231],"as":[232],"rhythms,":[238],"they":[239],"depend":[240],"primarily":[241],"presence":[244],"outflow.":[247],"Therefore":[248],"prognostic":[250],"value":[251],"may":[257],"derive":[258],"from":[259],"fundamental":[261],"importance":[262],"cardiovascular":[267],"health.":[268]},"counts_by_year":[{"year":2026,"cited_by_count":10},{"year":2025,"cited_by_count":22},{"year":2024,"cited_by_count":24},{"year":2023,"cited_by_count":18},{"year":2022,"cited_by_count":47},{"year":2021,"cited_by_count":26},{"year":2020,"cited_by_count":22},{"year":2019,"cited_by_count":20},{"year":2018,"cited_by_count":16},{"year":2017,"cited_by_count":25},{"year":2016,"cited_by_count":28},{"year":2015,"cited_by_count":28},{"year":2014,"cited_by_count":31},{"year":2013,"cited_by_count":36},{"year":2012,"cited_by_count":25}],"updated_date":"2026-10-31T12:09:11.096373","created_date":"2016-06-24T00:00:00"}
