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We hypothesised that, despite a high allostatic load, BMT would increase cardiorespiratory fitness and HRV, while lowering both sleeping HR and TNF\u03b1 in young healthy recruits.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Methods<\/jats:title>\n                <jats:p>Sixty-three recruits (18\u201343\u00a0years) undertook\u2009\u2265\u20092 overnight cardiac frequency recordings in weeks 1, 8 and 12 of BMT with 4\u00a0h of beat-to-beat HR collected between 00:00 and 06:00\u00a0h on each night. Beat-to-beat data were used to derive HR and HRV metrics which were analysed as weekly averages (totalling 8\u00a0h). A fasted morning blood sample was collected in the equivalent weeks for the measurement of circulating TNF\u03b1 concentrations and predicted VO<jats:sub>2<\/jats:sub>max was assessed in weeks 2 and 8.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Results<\/jats:title>\n                <jats:p>Predicted VO<jats:sub>2<\/jats:sub>max was significantly increased at week 8 (+\u20093.3\u2009\u00b1\u20092.6\u00a0mL\u00a0kg<jats:sup>\u22121<\/jats:sup>\u00a0min<jats:sup>\u22121<\/jats:sup>; <jats:italic>p<\/jats:italic>\u2009&lt;\u20090.001). Sleeping HR (wk1, 63\u2009\u00b1\u20097\u00a0b\u00a0min<jats:sup>\u22121<\/jats:sup>) was progressively reduced throughout BMT (wk8, 58\u2009\u00b1\u20096; wk12, 55\u2009\u00b1\u20096 b\u00a0min<jats:sup>\u22121<\/jats:sup>; <jats:italic>p<\/jats:italic>\u2009&lt;\u20090.01). Sleeping HRV reflected by the root mean square of successive differences (RMSSD; wk1, 86\u2009\u00b1\u200950\u00a0ms) was progressively increased (wk8, 98\u2009\u00b1\u200950; wk12, 106\u2009\u00b1\u200952\u00a0ms; <jats:italic>p<\/jats:italic>\u2009&lt;\u20090.01). Fasted circulating TNF\u03b1 (wk1, 9.1\u2009\u00b1\u20092.8\u00a0pg\/mL) remained unchanged at wk8 (8.9\u2009\u00b1\u20092.5\u00a0pg\/mL; <jats:italic>p<\/jats:italic>\u2009=\u20090.79) but were significantly reduced at wk12 (8.0\u2009\u00b1\u20092.4\u00a0pg\/mL; <jats:italic>p<\/jats:italic>\u2009&lt;\u20090.01).<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusion<\/jats:title>\n                <jats:p>Increased predicted VO<jats:sub>2<\/jats:sub>max, HRV and reduced HR during overnight sleep are reflective of typical cardiorespiratory endurance training responses. These results indicate that recruits are achieving cardiovascular health benefits despite the high allostatic load associated with the 12-week BMT.<\/jats:p>\n              <\/jats:sec>","DOI":"10.1007\/s00421-022-04987-3","type":"journal-article","created":{"date-parts":[[2022,7,14]],"date-time":"2022-07-14T10:08:06Z","timestamp":1657793286000},"page":"2135-2144","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":14,"title":["Overnight sleeping heart rate variability of Army recruits during a 12-week basic military training course"],"prefix":"10.1007","volume":"122","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7265-5725","authenticated-orcid":false,"given":"Michael J.","family":"Macartney","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9785-7216","authenticated-orcid":false,"given":"Penelope","family":"Larsen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7730-0253","authenticated-orcid":false,"given":"Neil","family":"Gibson","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6184-5814","authenticated-orcid":false,"given":"Scott","family":"Michael","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7945-0041","authenticated-orcid":false,"given":"Jace","family":"Drain","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8279-1787","authenticated-orcid":false,"given":"Gregory E.","family":"Peoples","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4881-150X","authenticated-orcid":false,"given":"Herbert","family":"Groeller","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2022,7,14]]},"reference":[{"key":"4987_CR1","doi-asserted-by":"publisher","DOI":"10.1016\/j.bbih.2021.100273","volume":"15","author":"NV Alen","year":"2021","unstructured":"Alen NV, Parenteau AM, Sloan RP, Hostinar CE (2021) Heart rate variability and circulating inflammatory markers in midlife. 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