Indicators of risk of ischaemic heart disease in patients with acute myocardial infarction under 65 years and their relatives.

The incidence of risk factors for atherosclerosis was investigated in a group of 846 patients under 65 years of age, hospitalized with acute myocardial infarction (AIM) in coronary hospital units in 21 districts of the Czech Republic in 1996. The group of patients comprises 649 men and 197 women. The incidence of risk factors in patients was compared with the incidence of risk factors in the population of the Czech Republic: the mean values of the investigated indicators are in patients with AIM higher in both sexes (total serum cholesterol, triacylglycerols, BMI, WHR). As to anamnestic data, in the majority low or irregular physical activity predominates, a high percentage of patients reported that they "do not restrict" or "rather do not restrict" their total food intake nor the intake of animal fats. Among the patients 52.6% males and 42.1% females were smokers. The results indicate that patients with AIM have a higher incidence of risk factors for atherosclerosis, a higher percentage of patients have cumulated risks and a higher percentage of patients has a higher risk score than the general population. The incidence of AIM is markedly higher in subjects with lower education.

A program to reduce cardiovascular and cerebrovascular disease in the czech republic: design and methods of the healthy dubec project.

Cardiovascular Disease (CVD) morbidity and mortality rates in the Czech Republic are among the highest in the industrialized world. Due to the substantial burden CVD plays on the health and well being of the Czech society, a variety of health promotion/disease management strategies to reduce CVD risk need to be designed and implemented. A project that combined community-based health education programs designed to address pervasive perceptions and cultural traditions that influence lifestyle factors, with secondary and tertiary prevention clinical strategies to aggressively treat high-risk individuals was recently conducted in Dubec, a small Czech community. This article describes the methods used in this project (i.e., the Healthy Dubec Project) which took American-based technology and experiences in community risk reduction methods and clinical management strategies for high risk patients and adapted them to fit the Czech people and their attitudes about CVD risk behaviors.

"Healthy Dubec" -design of a joint Czech-American community project for the reduction of cardiovascular and cerebrovascular disease (adapted from American experience).

The project is a combination of individual and community-based intervention which adapted and modified methods and techniques originally used in The Three-City Community Study and The Stanford Five-City Project in a small community outside Prague. The goal is to reduce cardiovascular and cerebrovascular risk factors by primary and secondary prevention, using a community-based approach. 61.5% of examined population with the low risk score during the baseline survey was exposed to intervention by community-based methods. 38.5% of adult population was included in intervention activities within the framework of secondary prevention in high risk groups. There are described: the method of community oriented intervention and the intervention oriented on high risk groups - nutrition intervention, quit smoking activities, stress control, physical activity promotion.

The mechanics of sprint running.

1. The effect of the velocity of shortening on the power developed by the muscles in sprint running was studied by measuring the mechanical work done to accelerate the body forward from the start to about 34 km/hr.2. The work was measured at each step from the data obtained by means of a platform sensitive to the force impressed by the foot.3. Almost the totality of the positive work done during the first second from the start is found as an increase of the kinetic energy of the body. However, as the speed of the run rises, air resistance and particularly the deceleration of the body forward, taking place at each step, rapidly increase, limiting the speed of the run.4. The average power developed by the muscles during the push at each step increases with the velocity of running reaching 3-4 h.p. at the maximal speed attained.5. At low speed the contractile component of the muscles seems to be mainly responsible for the power output, whereas at high speed (25-34 km/hr) an appreciable fraction of the power appears to be sustained by the mechanical energy stored in the ;series elastic elements' during stretching the contracted muscles (negative work) and released immediately after in the positive work phase.