Validation, Recalibration, and Predictive Accuracy of Published VO2maxPrediction Equations for Adults Ages 50-96 Yr

Benjamin T. Schumacher, Chongzhi Di, John Bellettiere, Michael J. Lamonte, Eleanor M. Simonsick, Humberto Parada, Steven P. Hooker, Andrea Z. Lacroix

Research output: Contribution to journalArticlepeer-review

Abstract

Purpose Maximal oxygen uptake (V O 2max) is the criterion measure of cardiorespiratory fitness. Lower cardiorespiratory fitness is a strong predictor of poor health outcomes, including all-cause mortality. Because V O 2max testing is resource intensive, several non-exercise-based V˙O2max prediction equations have been published. We assess these equations' ability to predict measured V˙O2max, recalibrate these equations, and quantify the association of measured and predicted V˙O2max with all-cause mortality. Methods Baltimore Longitudinal Study of Aging participants with valid V˙O2max tests were included (n = 1080). Using published V˙O2max prediction equations, we calculated predicted V˙O2max and present performance metrics before and after recalibration (deriving new regression estimates by regressing measured V˙O2max on Baltimore Longitudinal Study of Aging covariates). Cox proportional hazards models were fit to quantify associations of measured, predicted, and recalibration-predicted values of V˙O2max with mortality. Results Mean age and V˙O2max were 69.0 ± 10.4 yr and 21.6 ± 5.9 mL·kg-1·min-1, respectively. The prediction equations yielded root mean square error values ranging from 4.2 to 20.4 mL·kg-1·min-1. After recalibration, these values decreased to 3.9-4.2 mL·kg-1·min-1. Adjusting for all covariates, all-cause mortality risk was 66% lower for the highest quartile of measured V˙O2max relative to the lowest. Predicted V˙O2max variables yielded similar estimates in unadjusted models but were not robust to adjustment. Conclusions Measured V˙O2max is an extremely strong predictor of all-cause mortality. Several published V˙O2max prediction equations yielded the following: 1) reasonable performance metrics relative to measured V˙O2max especially when recalibrated, and 2) all-cause mortality hazard ratios similar to those of measured V˙O2max, especially when recalibrated, yet 3) were not robust to adjustment for basic demographic covariates likely because these were used in the equation for predicted V˙O2max.

Original languageEnglish (US)
Pages (from-to)322-332
Number of pages11
JournalMedicine and Science in Sports and Exercise
Volume55
Issue number2
DOIs
StatePublished - Feb 1 2023

Keywords

  • AGING
  • ASSESSMENT
  • CARDIORESPIRATORY FITNESS
  • EPIDEMIOLOGY
  • RECALIBRATION

ASJC Scopus subject areas

  • Physical Therapy, Sports Therapy and Rehabilitation
  • Orthopedics and Sports Medicine

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