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More easily obtained than ventilatory thresholds, HRV\n                    <jats:sub>0.75<\/jats:sub>\n                    and HRV\n                    <jats:sub>0.5<\/jats:sub>\n                    could be used as fitness markers along a continuum of the physiological response between rest and maximal exercise.\n                  <\/jats:p>","DOI":"10.1152\/japplphysiol.00017.2025","type":"journal-article","created":{"date-parts":[[2025,3,18]],"date-time":"2025-03-18T11:09:41Z","timestamp":1742296181000},"page":"1002-1010","update-policy":"https:\/\/doi.org\/10.1152\/aps-crossmark-policy","source":"Crossref","is-referenced-by-count":2,"title":["Heart rate variability during exercise can quantify cardiorespiratory deconditioning in 55- to 65-yr-old men and women exposed to head-down bed 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