| Summary: | Abstract The prevalence of overweight and obesity among adolescents has increased worldwide at the population-level, reflecting inactive lifestyle and excessive energy intake. The comorbidities of obesity, e.g. impaired glucose tolerance and high blood pressure increase the risk for cardiovascular diseases. The first manifestation of cardiovascular diseases can be detected in young adulthood, and prevention should be focused to those at highest risk. This study was aimed to evaluate the changes in body weight and body composition, physical fitness and cardiometabolic risk factors, associated with physical exercise during military service. Furthermore, this study investigated the association of antenatal and lifestyle factors with the body composition and physical fitness among young men. The material of this study consisted of 1046 men (mean age 19.2 years) who began their compulsory military service in the Sodankylä Jaeger Brigade in 2005. The conscripts’ cardiometabolic risk factors, body weight, body composition, fitness, and lifestyle habits were evaluated at baseline and after 6–12 months military service. The data on the participants’ mothers’ antenatal and participants’ childhood period was available for 508 offsprings, who belonged to the 1986 Northern Finland Birth Cohort. During the military service the prevalence of metabolic syndrome decreased in the overall cohort from 6.1% to 3.6%, and the reduction was present among overweight and obese conscripts. The reduction in metabolic syndrome was associated with the reduction in waist circumference, weight loss and improvement in muscle fitness. Some lifestyle factors e.g. maternal smoking during pregnancy and conscripts’ smoking, alcohol consumption and binge drinking were associated with the conscripts’ body composition and fitness test results. Military service was especially beneficial for those reporting weekly binge drinking, who showed the greatest reduction in body weight and fat, and improvements in physical fitness and lifestyle habits. This ...
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