### Abstract

METHODS AND RESULTS: We studied 18 102 male veterans (8305 blacks and 8746 whites). All completed an exercise test between 1986 and 2011 with no evidence of ischemia. We defined the peak metabolic equivalents (METs) level associated with no increase in all-cause mortality risk (hazard ratio, 1.0) for the age categories of <50, 50 to 59, 60 to 69, and ≥70 years. We used this as the threshold group to form additional age-specific fitness categories based on METs achieved below and above it: least-fit (>2 METs below threshold; n=1692), low-fit (2 METs below threshold; n=4884), moderate-fit (2 METs above threshold; n=4646), fit (2.1-4 METs above threshold; n=1874), and high-fit (>4 METs above threshold; n=1301) categories. Multivariable Cox models were used to estimate hazard ratios (HRs) and 95% confidence intervals (CIs) for mortality across fitness categories. During follow-up (median=10.8 years), 5102 individuals died. Mortality risk for the cohort and each age category increased for the least-fit and low-fit categories (HR, 1.51; 95% CI, 1.37-1.66; and HR, 1.21; 95% CI, 1.12-1.30, respectively) and decreased for the moderate-fit; fit and high-fit categories (HR, 0.71; 95% CI, 0.65-0.78; HR, 0.63; 95% CI, 0.56-0.78; and HR, 0.49; 95% CI, 0.41-0.58, respectively). The trends were similar for 5- and 10-year mortality risk.

CONCLUSION: We defined age-specific exercise capacity thresholds to guide assessment of mortality risk in individuals undergoing a clinical exercise test.

BACKGROUND: Mortality risk decreases beyond a certain fitness level. However, precise definition of this threshold is elusive and varies with age. Thus, fitness-related mortality risk assessment is difficult.

Original language | English (US) |
---|---|

Pages (from-to) | 653-658 |

Number of pages | 6 |

Journal | Circulation |

Volume | 130 |

Issue number | 8 |

DOIs | |

State | Published - Aug 19 2014 |

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### All Science Journal Classification (ASJC) codes

- Cardiology and Cardiovascular Medicine
- Physiology (medical)

### Keywords

- exercise test
- exercise tolerance
- metabolic equivalent
- mortality

### Cite this

}

*Circulation*, vol. 130, no. 8, pp. 653-658. https://doi.org/10.1161/CIRCULATIONAHA.114.009666

**Age-specific exercise capacity threshold for mortality risk assessment in male veterans.** / Kokkinos, Peter.

Research output: Contribution to journal › Article

TY - JOUR

T1 - Age-specific exercise capacity threshold for mortality risk assessment in male veterans

AU - Kokkinos, Peter

PY - 2014/8/19

Y1 - 2014/8/19

N2 - METHODS AND RESULTS: We studied 18 102 male veterans (8305 blacks and 8746 whites). All completed an exercise test between 1986 and 2011 with no evidence of ischemia. We defined the peak metabolic equivalents (METs) level associated with no increase in all-cause mortality risk (hazard ratio, 1.0) for the age categories of <50, 50 to 59, 60 to 69, and ≥70 years. We used this as the threshold group to form additional age-specific fitness categories based on METs achieved below and above it: least-fit (>2 METs below threshold; n=1692), low-fit (2 METs below threshold; n=4884), moderate-fit (2 METs above threshold; n=4646), fit (2.1-4 METs above threshold; n=1874), and high-fit (>4 METs above threshold; n=1301) categories. Multivariable Cox models were used to estimate hazard ratios (HRs) and 95% confidence intervals (CIs) for mortality across fitness categories. During follow-up (median=10.8 years), 5102 individuals died. Mortality risk for the cohort and each age category increased for the least-fit and low-fit categories (HR, 1.51; 95% CI, 1.37-1.66; and HR, 1.21; 95% CI, 1.12-1.30, respectively) and decreased for the moderate-fit; fit and high-fit categories (HR, 0.71; 95% CI, 0.65-0.78; HR, 0.63; 95% CI, 0.56-0.78; and HR, 0.49; 95% CI, 0.41-0.58, respectively). The trends were similar for 5- and 10-year mortality risk.CONCLUSION: We defined age-specific exercise capacity thresholds to guide assessment of mortality risk in individuals undergoing a clinical exercise test.BACKGROUND: Mortality risk decreases beyond a certain fitness level. However, precise definition of this threshold is elusive and varies with age. Thus, fitness-related mortality risk assessment is difficult.

AB - METHODS AND RESULTS: We studied 18 102 male veterans (8305 blacks and 8746 whites). All completed an exercise test between 1986 and 2011 with no evidence of ischemia. We defined the peak metabolic equivalents (METs) level associated with no increase in all-cause mortality risk (hazard ratio, 1.0) for the age categories of <50, 50 to 59, 60 to 69, and ≥70 years. We used this as the threshold group to form additional age-specific fitness categories based on METs achieved below and above it: least-fit (>2 METs below threshold; n=1692), low-fit (2 METs below threshold; n=4884), moderate-fit (2 METs above threshold; n=4646), fit (2.1-4 METs above threshold; n=1874), and high-fit (>4 METs above threshold; n=1301) categories. Multivariable Cox models were used to estimate hazard ratios (HRs) and 95% confidence intervals (CIs) for mortality across fitness categories. During follow-up (median=10.8 years), 5102 individuals died. Mortality risk for the cohort and each age category increased for the least-fit and low-fit categories (HR, 1.51; 95% CI, 1.37-1.66; and HR, 1.21; 95% CI, 1.12-1.30, respectively) and decreased for the moderate-fit; fit and high-fit categories (HR, 0.71; 95% CI, 0.65-0.78; HR, 0.63; 95% CI, 0.56-0.78; and HR, 0.49; 95% CI, 0.41-0.58, respectively). The trends were similar for 5- and 10-year mortality risk.CONCLUSION: We defined age-specific exercise capacity thresholds to guide assessment of mortality risk in individuals undergoing a clinical exercise test.BACKGROUND: Mortality risk decreases beyond a certain fitness level. However, precise definition of this threshold is elusive and varies with age. Thus, fitness-related mortality risk assessment is difficult.

KW - exercise test

KW - exercise tolerance

KW - metabolic equivalent

KW - mortality

UR - http://www.scopus.com/inward/record.url?scp=85027941269&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85027941269&partnerID=8YFLogxK

U2 - 10.1161/CIRCULATIONAHA.114.009666

DO - 10.1161/CIRCULATIONAHA.114.009666

M3 - Article

C2 - 24938279

AN - SCOPUS:85027941269

VL - 130

SP - 653

EP - 658

JO - Circulation

JF - Circulation

SN - 0009-7322

IS - 8

ER -