biostudies-literatureThomas JMNCATS NIH HHS44-53https://www.ebi.ac.uk/biostudies/studies/S-EPMC9718361biostudies-literatureUnknown11(2)<h4>Background</h4>Cardiorespiratory fitness, typically measured as peak oxygen uptake (VO_2peak) during maximal graded exercise testing (GXT_max), is a predictor of morbidity, mortality, and cardiovascular disease. However, measuring VO_2peak is costly and inconvenient and thus not widely used in clinical settings. Alternatively, postexercise heart rate recovery (HRRec), which is an index of vagal reactivation, is a valuable assessment of VO_2peak in older adults and athletes. However, the validity of HRRec as a clinical indicator of cardiorespiratory fitness in young, sedentary adults, who are a rapidly growing population at risk for developing obesity and cardiovascular disease, has not been fully elucidated.<h4>Methods</h4>We investigated the assJournal of clinical exercise physiologyHeart rate recovery as an assessment of cardiorespiratory fitness in young adults.PMC9718361UL1 TR001998TL1 TR001997Thomas JMPendergast JSBlack WSClasey JLKern PAfalseHeart rate recovery as an assessment of cardiorespiratory fitness in young adults.<h4>Background</h4>Cardiorespiratory fitness, typically measured as peak oxygen uptake (VO_2peak) during maximal graded exercise testing (GXT_max), is a predictor of morbidity, mortality, and cardiovascular disease. However, measuring VO_2peak is costly and inconvenient and thus not widely used in clinical settings. Alternatively, postexercise heart rate recovery (HRRec), which is an index of vagal reactivation, is a valuable assessment of VO_2peak in older adults and athletes. However, the validity of HRRec as a clinical indicator of cardiorespiratory fitness in young, sedentary adults, who are a rapidly growing population at risk for developing obesity and cardiovascular disease, has not been fully elucidated.<h4>Methods</h4>We investigated the ass2022-01-01T00:00:00Z2022 Jun2025-04-21T16:46:57.289Z2025-04-21T16:46:57.289ZS-EPMC97183613646630410.31189/2165-6193-11.2.44