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Of the 58 articles testing existing standard of care, 44 (76%) reversed that practice, whereas 14 (24%) reaffirmed it. CONCLUSION Reversal of cardiopulmonary resuscitation practices is widespread. This investigation sheds new light on low-value practices and patterns of medical research and suggests that novel resuscitation practices have low pretest probability and should be empirically tested with rigorous trials before implementation. OBJECTIVE To investigate whether the inverse associations of cardiorespiratory fitness (CRF) with all-cause and cardiovas