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The current study investigated the impact of high leisure-time physical activity (LTPA) combined with cardiorespiratory fitness (CRF) on risk of SCD. It included 2,656 randomly selected men aged 42 to 60 years from the Kuopio Ischemic Heart Disease Risk Factor Study, a Finnish study of risk predictors for cardiovascular outcomes and SCD in the general population.
Amsterdam, The Netherlands – Sunday 1 September 2013: Physical activity decreases the risk of sudden cardiac death in unfit men, reveals research presented at the ESC Congress today by Dr Jari Laukkanen and Dr Magnus Hagnas from Finland.
Dr Laukkanen said: “Sudden cardiac death (SCD) accounts for approximately 50% of deaths from coronary heart disease. SCD typically occurs shortly after the onset of symptoms, leaving little time for effective medical interventions, and most cases occur outside hospital with few or no early warning signs. Finding ways to identify individuals at elevated risk of SCD would allow early interventions on risk factors to be implemented.”
The current study investigated the impact of high leisure-time physical activity (LTPA) combined with cardiorespiratory fitness (CRF) on risk of SCD. It included 2,656 randomly selected men aged 42 to 60 years from the Kuopio Ischemic Heart Disease Risk Factor Study, a Finnish study of risk predictors for cardiovascular outcomes and SCD in the general population. Baseline cycle exercise test and risk factor assessment were performed in 1984-89. SCD was defined as death with cardiac origin within 24 hours after onset of symptoms. LTPA was assessed using a 12-month physical activity questionnaire. One third of subjects had low LTPA (energy consumption <191 kcal/day, equal to around 35 minutes of slow walking or 25 minutes of jogging for a 70 kg male). CRF was assessed with a maximal symptom limited cycle exercise test and peak oxygen uptake was calculated in metabolic equivalents (MET). One third of men had a low CRF (<7.9 METs).For the analyses the study population was divided into 4 groups: 1) high CRF and high LTPA, 2) high CRF and low LTPA, 3) low CRF and high LTPA and 4) low CRF and low LTPA. Group 1 was used as a reference. The risk of SCD was adjusted for previously established cardiovascular risk factors (age, smoking, alcohol consumption, body mass index, systolic blood pressure, low density lipoprotein cholesterol, C-reactive protein, prevalent type 2 diabetes and previously diagnosed coronary heart disease).During the mean 19 years of follow-up 193 SCDs occurred. There was a 2-fold increased risk of SCD in men with low CRF and LTPA (group 4, see figure) compared to men with high CRF and high LTPA (hazard ratio [HR] 2.0, 95% confidence interval [CI] 1.3-2.9). Men with low CRF and high LTPA (group 3) did not have a statistically significant increased SCD risk compared to men with high CRF and high LTPA (HR 1.3, 95% CI 0.9-1.8). Dr Laukkanen said: “This indicates that a higher amount of leisure-time physical activity might reduce the risk of SCD among men with low cardiorespiratory fitness.”The amount of LTPA did not affect the risk of SCD among the men with high CRF (groups 1 and 2).
Dr Laukkanen said: “Our study shows that CRF is a risk factor for SCD. High leisure-time physical activity exerts a protective effect on the risk of SCD among men with low cardiorespiratory fitness but does not affect risk in men with high baseline CRF.”He added: “It is widely believed that the level of CRF is determined by physical exercise, genetics and other lifestyle factors. Our study shows that exercise training and LTPA may be especially important in individuals with low CRF. One possible explanation is that CRF can be improved with regular exercise training.” Dr Laukkanen concluded: “The importance of CRF has often been neglected in the equation of SCD risk, despite appearing to be one of the most important correlates of overall health status. Our study emphasises the importance of regular physical exercise, especially among men with low CRF. An exercise test could be used to identify individuals with low CRF and high risk of SCD, who should then be urged to exercise more.”
Cumulative survival from SCD according to CRF and LTPA
This press release accompanies both a presentation and an ESC press conference at the ESC Congress 2013. Edited by the ESC from material supplied by the investigators themselves, this press release does not necessarily reflect the opinion of the European Society of Cardiology. The content of the press release has been approved by the presenter.More information on the ESC Press Conference page: Everyday life
About the European Society of CardiologyThe European Society of Cardiology (ESC) represents more than 80 000 cardiology professionals across Europe and the Mediterranean. Its mission is to reduce the burden of cardiovascular disease in Europe. About ESC Congress 2013The ESC Congress is currently the world’s premier conference on the science, management and prevention of cardiovascular disease. The spotlight of this year's event is "The Heart Interacting with Systemic Organs". ESC Congress 2013 takes place from 31 August to 4 September at the RAI centre in Amsterdam, Netherlands. More information on ESC Congress 2013 contact the ESC Press Office.
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