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Objectively Assessed Cardiorespiratory Fitness and All-Cause Mortality Risk

An Updated Meta-analysis of 37 Cohort Studies Involving 2,258,029 Participants
  • Jari A. Laukkanen
    Correspondence
    Correspondence: Address to Jari A. Laukkanen, MD, PhD, Institute of Clinical Medicine, University of Eastern Finland, Kuopio, P.O. Box 100, FI-70029 Kuopio University Hospital, Finland
    Affiliations
    Central Finland Health Care District Hospital District, Department of Medicine, Jyväskylä, Finland

    Institute of Clinical Medicine, Department of Internal Medicine, and the Institute of Public Health and Clinical Nutrition, University of Eastern Finland, Kuopio, Finland
    Search for articles by this author
  • Nzechukwu M. Isiozor
    Affiliations
    Institute of Clinical Medicine, Department of Internal Medicine, and the Institute of Public Health and Clinical Nutrition, University of Eastern Finland, Kuopio, Finland
    Search for articles by this author
  • Setor K. Kunutsor
    Affiliations
    Central Finland Health Care District Hospital District, Department of Medicine, Jyväskylä, Finland

    National Institute for Health Research Bristol Biomedical Research Centre, University Hospitals Bristol NHS Foundation Trust and University of Bristol, Bristol, UK

    Musculoskeletal Research Unit, Translational Health Sciences, Bristol Medical School, University of Bristol, Learning & Research Building (Level 1), Southmead Hospital, Bristol, UK
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      Abstract

      Objective

      To detail the magnitude and specificity of the association between cardiorespiratory fitness (CRF) and all-cause mortality risk.

      Methods

      Cohort studies with at least 1 year of follow-up were sought from inception until December 2021 in MEDLINE, Embase, Web of Science, and a manual search of relevant articles. Relative risks (RRs) with 95% CIs were pooled using random-effects models. Quality of the evidence was assessed using the Grading of Recommendations Assessment, Development and Evaluation tool.

      Results

      A total of 37 unique studies comprising of 2,258,029 participants with 108,613 all-cause mortality events were eligible. The pooled multivariable-adjusted RR for all-cause mortality comparing the top vs bottom tertiles of CRF levels was 0.55 (95% CI, 0.50 to 0.61). When CRF was expressed in metabolic equivalent task (MET) units, the corresponding pooled RR was 0.56 (95% CI, 0.50 to 0.62). For every 1-MET increase in CRF, the RR for all-cause mortality was 0.89 (95% CI, 0.86 to 0.92). Strength of the association did not differ by publication year, age, sex, follow-up duration, CRF assessment method, or risk of bias.

      Conclusion

      Aggregate analysis of observational cohort studies confirms a strong inverse and independent association between CRF and all-cause mortality risk. The results suggest that guideline bodies should consider the inclusion of CRF in standard risk panels for mortality risk assessment.

      Abbreviations and Acronyms:

      CPX (cardiopulmonary exercise testing), CRF (cardiorespiratory fitness), CVD (cardiovascular disease), HR (hazard ratio), LV (left ventricular), MET (metabolic equivalent), OR (odds ratio), PA (physical activity), RR (relative risk)
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