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This cardiac autonomic profile, measured by heart rate variability (HRV), has been associated with significant benefits for cardiovascular health. Aging is associated with decreased nighttime sleep quality and lower parasympathetic activity during both sleep and resting. However, it is not known whether age\u2010related dampening of HRV extends to daytime sleep, diminishing the cardiovascular benefits of naps in the elderly. Here, we investigated this question by comparing the autonomic activity profile between young and older healthy adults during a daytime nap and a similar period of wakefulness (quiet wake; QW). For each condition, from the electrocardiogram (ECG), we obtained beat\u2010to\u2010beat HRV intervals (RR), root mean square of successive differences between adjacent heart\u2010beat\u2010intervals (RMSSD), high\u2010frequency (HF), low\u2010frequency (LF) power, and total power (TP), HF normalized units (HF\n                    <jats:sub>nu<\/jats:sub>\n                    ), and the LF\/HF ratio. As previously reported, young subjects showed a parasympathetic dominance during NREM, compared with REM, prenap rest, and WASO. Moreover, older, compared to younger, adults showed significantly lower vagally mediated HRV (measured by RMSSD, HF, HF\n                    <jats:sub>nu<\/jats:sub>\n                    ) during NREM. Interestingly, however, no age\u2010related differences were detected during prenap rest or QW. Altogether, our findings suggest a sleep\u2010specific reduction in parasympathetic modulation that is unique to NREM sleep in older adults.\n                  <\/jats:p>","DOI":"10.1111\/psyp.13701","type":"journal-article","created":{"date-parts":[[2020,10,13]],"date-time":"2020-10-13T14:40:40Z","timestamp":1602600040000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":24,"title":["Age\u2010related losses in cardiac autonomic activity during a daytime nap"],"prefix":"10.1111","volume":"58","author":[{"given":"Pin\u2010Chun","family":"Chen","sequence":"first","affiliation":[{"name":"Department of Cognitive Science University of California Irvine CA USA"},{"name":"Department of Statistics University of California Irvine CA USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Negin","family":"Sattari","sequence":"additional","affiliation":[{"name":"Department of Cognitive Science University of California Irvine CA USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lauren N.","family":"Whitehurst","sequence":"additional","affiliation":[{"name":"Department of Psychology University of Kentucky Lexington KY USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0906-3097","authenticated-orcid":false,"given":"Sara C.","family":"Mednick","sequence":"additional","affiliation":[{"name":"Department of Cognitive Science University of California Irvine CA USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2020,10,13]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1046\/j.1440\u20101819.2003.01080.x"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jml.2007.12.005"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.18637\/jss.v067.i01"},{"key":"e_1_2_8_5_1","doi-asserted-by":"publisher","DOI":"10.1161\/CIR.0000000000000485"},{"key":"e_1_2_8_6_1","doi-asserted-by":"publisher","DOI":"10.3389\/fphys.2013.00026"},{"key":"e_1_2_8_7_1","doi-asserted-by":"publisher","DOI":"10.1093\/gerona\/61.4.405"},{"key":"e_1_2_8_8_1","doi-asserted-by":"publisher","DOI":"10.1152\/japplphysiol.01095.2002"},{"key":"e_1_2_8_9_1","doi-asserted-by":"publisher","DOI":"10.1088\/0967\u20103334\/23\/2\/308"},{"key":"e_1_2_8_10_1","doi-asserted-by":"publisher","DOI":"10.1177\/074873099129000894"},{"key":"e_1_2_8_11_1","doi-asserted-by":"publisher","DOI":"10.5665\/sleep.3230"},{"key":"e_1_2_8_12_1","doi-asserted-by":"publisher","DOI":"10.1016\/S1388\u20102457(01)00507\u20107"},{"key":"e_1_2_8_13_1","doi-asserted-by":"publisher","DOI":"10.1046\/j.1365\u20102869.2003.00353.x"},{"key":"e_1_2_8_14_1","doi-asserted-by":"publisher","DOI":"10.1093\/sleep\/30.7.913"},{"key":"e_1_2_8_15_1","doi-asserted-by":"publisher","DOI":"10.33549\/physiolres.930645"},{"key":"e_1_2_8_16_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1532\u20105415.2005.53009.x"},{"key":"e_1_2_8_17_1","doi-asserted-by":"publisher","DOI":"10.1093\/ije\/29.3.429"},{"key":"e_1_2_8_18_1","doi-asserted-by":"publisher","DOI":"10.1111\/psyp.12595"},{"key":"e_1_2_8_19_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.arr.2018.09.005"},{"key":"e_1_2_8_20_1","doi-asserted-by":"publisher","DOI":"10.1162\/jocn_a_01588"},{"key":"e_1_2_8_21_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.nlm.2020.107267"},{"key":"e_1_2_8_22_1","doi-asserted-by":"publisher","DOI":"10.1097\/ALN.0b013e31816d83e4"},{"key":"e_1_2_8_23_1","doi-asserted-by":"publisher","DOI":"10.1152\/ajpheart.1997.273.4.H1841"},{"key":"e_1_2_8_24_1","doi-asserted-by":"publisher","DOI":"10.1161\/01.CIR.103.1.84"},{"key":"e_1_2_8_25_1","doi-asserted-by":"publisher","DOI":"10.1111\/jsr.12313"},{"key":"e_1_2_8_26_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ijpsycho.2014.06.014"},{"key":"e_1_2_8_27_1","doi-asserted-by":"publisher","DOI":"10.1080\/15402002.2016.1178115"},{"key":"e_1_2_8_28_1","doi-asserted-by":"publisher","DOI":"10.1161\/01.CIR.93.5.1043"},{"key":"e_1_2_8_29_1","doi-asserted-by":"publisher","DOI":"10.1017\/S1041610202008475"},{"key":"e_1_2_8_30_1","doi-asserted-by":"publisher","DOI":"10.1093\/sleep\/zsz036"},{"key":"e_1_2_8_31_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0002\u20108703(02)94797\u20106"},{"key":"e_1_2_8_32_1","doi-asserted-by":"publisher","DOI":"10.1007\/s00421\u2010004\u20101208\u20100"},{"key":"e_1_2_8_33_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0167\u20108760(03)00073\u20104"},{"key":"e_1_2_8_34_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jpsychores.2018.09.010"},{"key":"e_1_2_8_35_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.sleh.2014.12.010"},{"issue":"2","key":"e_1_2_8_36_1","first-page":"97","article-title":"A self\u2010assessment questionnaire to determine morningness\u2010eveningness in human circadian rhythms","volume":"4","author":"Horne J. 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