Relationship between Cardiorespiratory Fitness and Non-High-Density Lipoprotein Cholesterol: A Cohort Study

Area of Science:

• Cardiovascular Health
• Lipid Metabolism
• Exercise Physiology

Background:

• Non-high-density lipoprotein cholesterol (non-HDL-C) is increasingly recognized as a significant marker for coronary heart disease and broader cardiovascular disease risk.
• Cardiorespiratory fitness (CRF) is a key indicator of overall health and a predictor of mortality.

Purpose of the Study:

• To investigate the relationship between cardiorespiratory fitness (CRF) and the incidence of elevated non-high-density lipoprotein cholesterol (non-HDL-C) levels.
• To determine if CRF is an independent predictor of high non-HDL-C in Japanese men.

Main Methods:

• A cohort of 4,067 Japanese men without dyslipidemia underwent submaximal exercise testing to estimate CRF in 1986.
• Participants were monitored for the incidence of high non-HDL-C (≥170 mg/dL) over a 20-year period (1986-2006).
• Cox proportional hazard models were employed to analyze the association between CRF levels and non-HDL-C incidence, adjusting for relevant covariates.

Main Results:

• After age adjustment, higher CRF levels (quartiles II-IV) were associated with a reduced risk of high non-HDL-C compared to the lowest CRF group (quartile I).
• The hazard ratio for high non-HDL-C decreased significantly with increasing CRF, with the highest quartile showing a 30% reduction (HR: 0.70; 95% CI: 0.60-0.81).
• Even after further adjustment for body mass index, blood pressure, smoking, alcohol intake, and family history, a significant inverse relationship persisted (P for trend=0.001).

Conclusions:

• Cardiorespiratory fitness demonstrates an inverse relationship with the incidence of high non-HDL-C in Japanese men.
• Higher levels of CRF are associated with a lower likelihood of developing elevated non-HDL-C.
• These findings underscore the importance of maintaining good CRF for lipid management and cardiovascular disease prevention.