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Published on: April 19, 2019
Cardiorespiratory fitness, LDL cholesterol, and CHD mortality in men
Stephen W Farrell1, Carrie E Finley, Scott M Grundy
1The Cooper Institute, Dallas, TX 75230, USA. sfarrell@cooperinst.org
Insights
Higher cardiorespiratory fitness (CRF) is linked to lower coronary heart disease (CHD) mortality in men. Maintaining moderate to high CRF significantly reduces mortality risk, regardless of LDL cholesterol levels.
Area of Science:
- Cardiology
- Preventive Medicine
- Exercise Physiology
Background:
- Limited data exist on the combined impact of cardiorespiratory fitness (CRF) and LDL cholesterol on coronary heart disease (CHD) mortality.
- Understanding this relationship is crucial for cardiovascular risk assessment in men.
Purpose of the Study:
- To investigate the joint association of CRF and LDL cholesterol concentration with subsequent CHD mortality in a large cohort of men.
- To determine if CRF can modify the risk associated with elevated LDL cholesterol.
Main Methods:
- A cohort of 40,718 healthy men was followed for CHD mortality.
- Cardiorespiratory fitness (CRF) was assessed via maximal treadmill exercise test.
- Participants were categorized by CRF and LDL cholesterol levels; Cox regression analysis was used to compute hazard ratios (HRs).
Main Results:
- Decreasing CRF categories showed a significant positive trend in CHD mortality (P < 0.0001).
- Increasing LDL cholesterol categories also demonstrated a significant positive trend in CHD mortality (P < 0.0001).
- Within each LDL category, higher CRF was associated with significantly lower adjusted CHD mortality (P < 0.02).
Conclusions:
- Cardiorespiratory fitness (CRF) is a strong, inverse predictor of CHD mortality in men.
- Higher levels of CRF attenuate the mortality risk associated with elevated LDL cholesterol.
- Routine assessment of CRF is recommended for cardiovascular risk management.
Introduction:
There are no published data regarding the joint association of cardiorespiratory fitness (CRF) and LDL cholesterol concentration with subsequent CHD mortality in men.
Methods:
A total of 40,718 healthy men received a comprehensive baseline clinical examination between 1971 and 2006. CRF was determined from a maximal treadmill exercise test. Participants were divided into categories of low (quintile 1), moderate (quintiles 2-3), and high (quintiles 4-5) CRF by age group, as well as by Adult Treatment Panel III-defined LDL categories. HRs for CHD mortality were computed with Cox regression analysis.
Results:
A total of 557 deaths due to CHD occurred during 16.7 ± 9.0 yr (681,731 man-years) of follow-up. After adjustment for age, examination year, smoking status, family history, and body mass index, a significant positive trend in CHD mortality was shown across decreasing categories of CRF. HRs with 95% confidence interval were 1.0 (referent), 1.18 (0.94-1.47), and 2.10 (1.65-2.67) for high, moderate, and low fit groups, P trend <0.0001. Adjusted HRs were significantly higher across increasing LDL categories: 1.0 (referent), 1.30 (0.87-1.95), 1.54 (1.04-2.28), 2.16 (1.45-3.21), and 2.02 (1.31-3.13), P trend <0.0001. When grouped by CRF category as well as by LDL category, there was a significant positive trend (P < 0.02) in adjusted mortality across decreasing categories of CRF within each LDL category.
Conclusions:
CRF is strongly and inversely associated with CHD mortality in men. Compared with men with low CRF, at a moderate to high level of CRF, the risk of mortality within each LDL category is significantly attenuated. This study suggests that measurement of CRF should be considered for routine cardiovascular risk assessment and risk management.
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