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Cardiovascular effects of training for a marathon run in unfit middle aged men
I N Findlay1, R S Taylor, H J Dargie
1Department of Cardiology, Western Infirmary, Glasgow.
Insights
A 30-week marathon training program significantly improved cardiovascular health in sedentary men. The exercise intervention lowered cholesterol, triglycerides, and blood pressure, enhancing cardiac function and aerobic capacity.
Area of Science:
- Exercise physiology
- Cardiovascular health
- Preventive cardiology
Background:
- Sedentary lifestyles are associated with increased cardiovascular risk.
- Marathon training represents a significant physiological stressor and a potential intervention for improving health markers.
Purpose of the Study:
- To evaluate the impact of a 30-week marathon training program on serum lipid profiles, blood pressure, and cardiac function in sedentary middle-aged men.
- To assess changes in cardiorespiratory fitness, including maximum oxygen consumption.
Main Methods:
- A group of sedentary men (aged 35-50) underwent a 30-week marathon training program.
- Measurements included serum lipid concentrations (cholesterol, triglycerides), blood pressure, cardiac output, left ventricular volumes, ejection fraction, and maximum oxygen consumption before and after the training period.
Main Results:
- Significant reductions in serum cholesterol (12%) and triglycerides (22%) were observed.
- Mean blood pressure decreased by 10%.
- Cardiac function improved, with increased peak exercise cardiac output and left ventricular end-diastolic volume. Maximum oxygen consumption increased by approximately 15%.
Conclusions:
- A 30-week marathon training program yields substantial improvements in coronary risk factors and cardiac function.
- Regular, intensive exercise like marathon training is beneficial for cardiovascular health and prevention.
- These findings support the integration of regular exercise into coronary prevention strategies.
Abstract:
The effects of a 30 week exercise programme on serum lipid values, blood pressure, and cardiac function were assessed in a group of sedentary men aged 35-50 training for their first marathon. Mean serum cholesterol concentration (n = 33) fell by 12% from 6.54 (SE 0.18) to 5.76 (0.15) mmol/l (mean fall 0.78 mmol/l; 95% confidence interval 0.52 to 1.04 mmol/l), serum triglyceride concentration (n = 33) by 22% from 1.56 (0.17) to 1.21 (0.09) mmol/l (mean fall 0.34 mmol/l; 95% confidence interval 0.12 to 0.56 mmol/l), and mean blood pressure (n = 27) by 10% from 102 (2) to 92 (2) mm Hg (mean fall 10 mm Hg; 95% confidence interval 7 to 13 mm Hg). These changes were not explained by changes in body composition. Peak exercise left ventricular end diastolic volume (n = 16) increased with training; as a result of this and an increased exercise left ventricular ejection fraction peak exercise cardiac output increased from 19.9 (1.2) to 23.1 (3.0) l/min (mean rise 3.2 l/min; 95% confidence interval 1.5 to 5.0 l/min). Maximum oxygen consumption increased from 33.9 (1.6) to 39.0 (1.3) ml/kg/min (mean rise 5.0 ml/kg/min; 95% confidence interval 1.8 to 8.2 ml/kg/min). This study showed favourable effects on coronary risk factors and cardiac function and supports the place of regular exercise in coronary prevention programmes.