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Arquivos Brasileiros de Cardiologia

Print version ISSN 0066-782XOn-line version ISSN 1678-4170

Arq. Bras. Cardiol. vol.77 no.3 São Paulo Sept. 2001

http://dx.doi.org/10.1590/S0066-782X2001000900005 

Original Article


 

Physical Activity, Cardiorespiratory Fitness, Dietary Content, and Risk Factors That Cause a Predisposition Towards Cardiovascular Disease

 

Dartagnan Pinto Guedes, Joana Elisabete Ribeiro Pinto Guedes

Londrina, PR - Brazil

 

 

OBJECTIVE: To analyze associations between levels of physical activity, cardiorespiratory fitness, dietary content, and risk factors that cause a predisposition towards cardiovascular disease.
METHODS: Sixty-two individuals aged between 20 and 45 years were evaluated. Levels of physical activity were established by estimates of energy demand corresponding to everyday activity; indices for cardiorespiratory fitness were obtained from estimates of maximal oxygen consumption; information about dietary content was obtained from dietary records kept on seven consecutive days. To indicate risk factors that cause a predisposition towards cardiovascular disease, use was made of body mass indexes, waist-hip circumference relationships, levels of arterial pressure and of plasma lipid-lipoprotein concentration. To establish associations between the variables studied, multiple regression analysis was used.

RESULTS: Physical activity levels and cardiorespiratory fitness levels were inversely correlated with the amount and distribution of body fat and arterial pressure. Taken together, the two variables were responsible for between 16% and 19% of the variation in arterial pressure. Total and saturated fat ingestion was associated with higher serum lipid levels. Both dietary components were responsible for between 49% and 61% of the variation in LDL-cholesterol.
CONCLUSION: High ingestion of food rich in total and saturated fat and decreased levels of physical activity and of cardiorespiratory fitness are associated with an increased risk of cardiovascular disease, which supports previous data.
Key words: body fat, blood pressure, plasma lipids, lipoproteins

 

 

The consensus among specialists is that cardiovascular diseases are multifactorial in origin, resulting from so-called risk factors 1. Once risk factors are understood to be causal agents resulting in a predisposition towards heart diseases, monitoring of these risk factors aids in the identification of signals that, if modified, may attenuate or even reverse the evolution of heart diseases.

Compromising levels of plasma lipids-lipoproteins, high arterial pressure, and excessive fat/body weight ratios are considered biological risk factors of major significance in cardiovascular disease. These factors do not act alone but as a whole, causing an exponential rise in the possibility of cardiovascular accidents.

Physical activity and appropriate dietary habits are considered major mechanisms for protection from the surge and progression of risk factors that cause a predisposition towards cardiovascular disease 2-6. Therefore, differences regarding everyday performance of physical activity, levels of cardiorespiratory fitness, and dietary content have been frequently used in attempts to explain variations in the prevalence of cardiovascular disease in different population groups 7-10.

Incentives to increase physical activity and use of an adequately balanced dietary regime have played a significant role in various programs aimed at the prevention and control of heart diseases. Yet, although capable of influencing risk factors by a multiplicity of interacting metabolic, functional, and morphologic adaptations, the relative contributions of effective physical activity, cardiorespiratory fitness, and diet on risk factor variability ave not been clearly defined. Thus, studies aimed at the evaluation of the extent of these influences on specific segments of different populations are still required. It is expected that such a search will dentify, in a more explicit manner, preventive and therapeutic measures associated with cardiovascular diseases.

The objective of the study was to search for an explanation for variations observed in information associated with biological risk factors that cause a predisposition towards cardiovascular disease as functions of the levels of physical activity, cardiorespiratory fitness, and dietary content in adult, middle-aged individuals of either sex.

 

Methods

The study included employees of the administrative sector of the State University of Londrina, who were participating in physical exercise programs offered by the Center for Physical Education and Sports at the institution during the second semester of 1995. The study sample was composed of subjects involved in physical exercise, according to five basic criteria: a) to be between 20 and 45 years of age; b) to have been participating in the physical exercise programs for at least six months; c) to have been nonsmokers during the preceding five years; d) to not be using antihypertensives or similar drugs; e) to not be on special dietary regimens. The definitive sample was composed of 62 subjects, 21 males and 41 females.

The indicators of biological risk factors that cause a predisposition towards cardiovascular disease were information on amount/distribution of body fat, resting arterial blood pressure, and circulating lipid blood levels.

Estimates of amounts and distribution of body fat were obtained by calculating body mass index based on the ratio between body weight and hight squared (kg/m2). To determine hight, a stadiometer calibrated to 0.1cm and to verify body weight, anthropometric balance divided into 100g according to Gordon et al 11 were used. Waist and hip girth were measured with a flexible, decimal anthropometric steel band, following the standardization suggested by Callaway et al 12.

Systolic and diastolic arterial pressures of the left arm were ascertained in seated subjects after a 5min rest period, using a mercury column sphygmomanometer. Systolic arterial pressure corresponded to Korotkoff's phase 1 and diastolic pressure to phase V, or the disappearance of sound. Averages of two measurements were used for calculations.

Plasma lipid estimations were performed on 10-mL venous blood samples collected from the arm between 7:00 and 8:00 AM, after the subjects had fasted for 10-12 h. Serum was immediately centrifuged, and triglyceride, total cholesterol, and low- and high-density lipoprotein fractions were determined. Serum total cholesterol was determined spectrophotometrically with the enzymatic cholesterol oxidase/peroxidase method. HDL- and LDL-cholesterol were determined, respectively, with the reactive precipitant and Friedewald's formula 13. Serum triglycerides were determined with the glycerol enzymatic method.

Levels of physical activity were established by estimating the energy demand corresponding to everyday physical activity, with Bouchard and collaborator's retrospective everyday activity auto-recording instrument. Subjects filled out their own records over a consecutive seven-day period. For this, the day was divided into 96 periods of 15-min duration, subjects being instructed to record the type of activity performed during each period. Estimates of energy demand per kg of body weight were established from the caloric cost of the physical activity performed during each day (kcal/kg/day). Averaged seven-day energy demands recorded over seven days were used for calculations.

Information concerning dietary content was obtained from dietary records. Subjects were instructed to identify every food and drink and the amounts ingested over a period of seven consecutive days. From this information, the average energy supply/day/per kg of body weight (kcal/kg/day) and the average amounts (g/day) of protein, carbohydrate, and fat, and of saturated, monounsaturated, polyunsaturated fat and cholesterol were determined. Caloric equivalents and nutritional proportions of the food were established with the software Program of Nutrition Support – version –2, created by the Informatics Health Center of the Escola Paulista de Medicina.

Indicators of cardiorespiratory fitness were obtained from estimates of maximal oxygen consumption at maximal stress on the treadmill, according to Bruce's Protocol 15. The time period required to attain theoretical maximal heart rate (220-age) was used to estimate maximal oxygen consumption. For subjects unable to reach theoretical maximal heart rate, the duration of the stress test was used as an index. Indications for stopping the test were those recommended by the American College for Sports Medicine 16.

The statistical treatment of the information obtained was performed with the computerized Statistical Analysis System - version 3.0 package.

The set of variables that, when combined, best explained the variations in risk factor indicators was detected with stepwise multiple regression analysis, having as independent variables information on levels of physical activity, cardiorespiratory fitness, and dietary content. The predictive contribution of each variable was analyzed with the statistical significance test, involving beta coefficients presented by the regression models.

 

Results

Table I shows statistical information on the variables analyzed. Estimates on energy demand per kg of body weight, equivalent to everyday physical activity, showed similar average values for both sexes. Energy supply and demand of each subject showed that at the moment of the collection of information, 20% of men and 35% of women had an energy surplus. Maximal oxygen consumption, an indicator of cardiorespiratory fitness, did not show statistically significant differences between sexes, which is in agreement with evidence in the literature 17; nevertheless, men showed higher mean values compared to with women.

 

 

Results concerning dietary content showed statistical differences between sexes. Considering nutritional recommendations in the literature 18, the analyzed sample showed an increased ingestion of protein and fat, in particular of the saturated type. Yet, the ingestion of mono- and polyunsaturated fat was less than the recommended amounts.

In relation to the risk factors that cause a predisposition towards cardiovascular disease, average amounts found pointed to statistical differences in favor of men for body weight index, waist/hip circumference, systolic and diastolic arterial pressure, and triglycerides. Total, LDL, and HDL cholesterol values were similar between sexes. When compared with values suggested by the Brazilian Society of Cardiology 19, plasma lipid concentrations associated with increased risk of cardiovascular disease, were the same in approximately 12% of the samples studied; 12.3% had LDL-cholesterol values higher than 160mg/dL; 12.9% had HDL-cholesterol <35mg/dL, and 10.7% had triglyceride concentrations >200mg/dL. In addition, 13.9% of the sample analyzed had diastolic and systolic arterial pressure levels >90 or >140mmHg, respectively. Concerning the amount/distribution of body fat, 21% of the subjects were overweight (body mass index >28kg/m2), and 30.6% demonstrated increased centripetal fat concentration (waist/hip circumference >0.80 for women and >0.90 for men).

Results of multiple regression analysis are presented in Table II. Independent variables, which did not demonstrate a statistically significant predictive contribution, were disregarded in the setting up of the regression models. The results obtained pointed to total and saturated dietary fat amounts, energy demand corresponding to everyday physical activity, and maximal oxygen consumption as the most important variables in biological risk factor variations that cause a predisposition towards cardiovascular disease. Taken together, these variables were responsible for the totality of the variation explained by the entire aggregate of independent variables. The inclusion of other information regarding dietary content in the predictive model did not offer any additional information to be taken into account in statistical terms.

 

 

Indicators of physical activity and cardiorespiratory fitness demonstrated a higher predictive power when associated with the amount/distribution of body fat and arterial pressure levels. The findings show a systematic, positive impact of energy demand/day and maximal oxygen consumption on these variables, confirming the expectation that the more active the subjects, the better the body adiposity and arterial pressure profiles. Everyday energy demand and maximal oxygen consumption either together or isolated explain between 27% and 73% of the variations in the amounts/distribution of body fat, and between 16% and 19% of the variations observed in arterial pressure indexes.

Information on total and saturated fat ingestion was that most closely identified with plasma lipid-lipoprotein estimates, the greatest prominence given to LDL-cholesterol and triglyceride levels. Taken together, these two pieces of dietary information explain about 49% and 61% of the variations detected in the concentrations of LDL-cholesterol in men and women, respectively. In the case of triglycerides, despite maximal oxygen consumption having been pointed out as an element of better predictive power, when saturated fat ingestion was included in the regression model, the capacity of explanation of the model was raised to levels close to 22%-28%.

The results obtained reveal that the association between physical activity, cardiorespiratory fitness, and biological risk factors that cause a predisposition towards cardiovascular disease was more strong among women and, that among men, the association of diet risk factors was more pronounced.

 

Discussion

The associations of physical activity, cardiorespiratory fitness, and dietary content with the amount/distribution of body fat, arterial pressure, and plasma lipid-lipoproteins have been extensively investigated separately 5-10. However, none of these studies incorporated the three responses simultaneously in a single experimental design. This led to a difficulty in establishing the possible relative contributions of the level of physical activity, of cardiorespiratory fitness, and of dietary habits jointly specifically affecting the control of risk factors that cause a predisposition towards cardiovascular disease.

In the present study, simultaneous inclusion in the regression model of information related to physical activity, cardiorespiratory fitness, and dietary content suggests that marked positive variations in risk factors that cause a predisposition towards cardiovascular disease may be explained by the adoption by individuals of a physically more active life style and decreased amounts of total dietary and saturated fat. Nevertheless, depending on the risk factor under consideration, and on the subject's sex, important differences in the proportion of the variation can be attributed to the independent variables.

Looking at body mass index as a reference, it was verified that, in both sexes, estimates of energy demand corresponding to everyday activity and maximal oxygen consumption were singled out as the major components accounting for variations in the amounts of body fat. These results reveal that subjects physically less active in everyday life and with lower estimates of maximal oxygen consumption tend to have greater body weight. These findings resemble the results of other studies pointing towards hypoactivity as the major behavioral factor for the development of overweight and obesity 20,21.

Epidemiological surveys have shown that individuals with a sedentary life style demonstrate a relative risk of 3.1 and 3.8 associated with overweight and obesity, in comparison with their physically more active pairs 22.

Among men, besides indicators related to the practice of physical activity and cardiorespiratory fitness, the ingestion of total fat was the sole dietary component associated in a significant manner with body mass index. It is probable that the lower proportion of overweight individuals in the feminine sample analyzed may not have been strong enough to lead to the detection of an association between dietary content and body mass indexes in women. In agreement with other studies 5-8, these findings suggest that inappropriate proportions of fat in the diet may play a more important role than hyperphagia in the greater increase in body weight.

Indicators concerning the practice of physical activity and cardiorespiratory fitness are also significantly associated with a favorable distribution of body fat, especially in men. These findings supply evidence strengthening the hypothesis that higher levels of physical activity may minimize a tendency towards greater centripetal fat concentrations in adult males 23. Confirming expectations reported in the literature 6-8, among women modest levels of association between the waist/hip circumference ratios and any selected independent variable were observed in this study.

A more active everyday life style, coupled with increased estimates of maximal oxygen consumption, demonstrates once again a significant inverse relationship with compromising arterial pressure levels. Negative associations between physical activity, cardiorespiratory fitness, and arterial pressure levels have been reported in other epidemiological and experimental studies 24.

Several physiological mechanisms can explain the physical activity-maximal oxygen consumption-arterial pressure relationship. Regular practice of aerobic exercise of low to moderate intensity leads to decreased cardiac output and peripheral resistance by reducing neural sympathetic activity 25. Metabolic adaptation caused by physical activity can also potentiate the advantages of arterial pressure control. In general, the performance of adequate physical effort favors the reduction of plasma levels of norepinephrine, increases circulatory levels of vasodilator substances, and improves hyperisulinism 26.

Similarly to that which occurs in the regression model in men but not in women, with body mass index as the dependent variable, ingestion of total fat was the dietary component most closely related to arterial pressure levels. Earlier studies point out that mechanisms possibly responsible for the increase of in arterial pressure due to the higher ingestion of fat include altered prostaglandin production 27, increased sympathetic nervous system activity leading to vasoconstriction 28, and the influence of the lipid composition of plasma membranes 29.

In regard to plasma lipid-lipoprotein contents, it can be noted that total and saturated fat ingestion constitute the major predictive variables in the regression model. Taking into consideration the proportion of variation significantly explainable in statistical language, estimates of maximal oxygen consumption are also relatively important for the prediction of plasma lipid-lipoprotein levels. Higher ingestion of total and saturated fat was associated with a less favorable plasma lipid-lipoprotein profile, although estimates of maximal oxygen consumption were inversely associated with total cholesterol, LDL-cholesterol, and triglycerides, and positively associated with HDL-cholesterol. Subjects with the highest amounts of mainly saturated fat in the composition of their diet tended to have higher levels of plasma lipoprotein. On the other hand, values estimated for maximal oxygen consumption were a stronger predictor of HDL-cholesterol.

The significant association between fat ingestion and plasma lipid-lipoprotein content noted in the present study was similar to that of experimental studies reported in the literature 5-7. Nevertheless, evidence from epidemiological studies suggests that these associations could either not be confirmed 30 or were shown to be only marginally significant 31.

Some studies in the area have considered that possible methodological limitations justify the conflict observed between epidemiological and experimental results 32. In this connection, the lesser inter- and intrasubject variability in dietary consumption and, in turn, in the ingestion of macro- and micronutrients, minimizing the discriminatory capacity of the statistical resources involved in the handling of information, should be emphasized. Another limitation is the fragility of some instruments directed towards the everyday eating habits of the subjects involved in these studies.

Relative to maximal oxygen consumption, unanimity of opinion appears to exist concerning its importance in the control of plasma lipid-lipoprotein levels. Nevertheless, an important factor to be considered in the analysis of the results of studies involving the practice of physical exercise is the plasma lipid-lipoprotein profile present at the beginning of the experiment. The more deteriorated this initial profile, the greater the probability of observing significant responses to physical exercise programs. In contrast, subjects who initially have lower concentrations of total cholesterol, LDL-cholesterol, and triglycerides and higher concentrations of HDL-cholesterol demonstrate a decreased probability of having alterations in their postphysical exercise plasma lipid-lipoprotein profile 33.

Physiological mechanisms based on the regular practice of physical exercise lead to a favorable lipid-lipoprotein profile as the result of complex interactions between hormones, enzymes, and receptors. Some studies suggest that increased skeletal muscle or adipose tissue lipoprotein lipase activity, or both during the performance for several hours after exercise associated with a possible decrease in hepatic triglyceride synthesis may constitute a metabolic mode of adjustment favoring decreased concentrations of plasma lipids 34.

It has occasionally been speculated that favorable modifications in plasma lipid-lipoprotein levels induced by physical exercise may be confounded by concomitant alterations in body weight and body fat distribution profiles, consequent to the higher energy demand caused by the performance of exercise 35. In this regard, important studies involving well-designed experiments show that regular physical exercise, even when in the absence of significant alterations in body weight and fat content, can also induce substantial improvement in plasma lipid-lipoprotein levels 36,37.

Similarly to that previously observed 38, important differences due to sex were found, both in extent and availability of the set of independent variables that may statistically explain variations in plasma lipid-lipoprotein levels. The significant negative association between LDL-cholesterol and triglycerides and estimates of maximal oxygen consumption was more evident in women; in men it was the ingestion of total or saturated fat, or both that explained variations in plasma lipid-lipoproteins. This effect may, plausibly, be sustained by hormonal factors inducing different degrees of interaction between variables associated with the practice of physical activity and dietary content.

Previous studies point to the fact that polyunsaturated fat and, to a lesser degree, monounsaturated fat may eventually raise HDL-cholesterol levels, a desirable effect 39. Clinical procedures involving modification of dietary content suggest that by partially replacing saturated fat with mono- and polyunsaturated fat favorable alterations in the profile of lipid-lipoproteins can be induced in those with hyperlipemia and hypercholesterolemia 40. However, the inclusion of these micronutrients failed to statistically improve regression models established in the present study. Possibly, the inclusion of variables related to the practice of physical activity and cardiorespiratory fitness in the regression model limited the association between dietary components and risk factors, minimizing the predictive capacity of mono- and polyunsaturated fat.

The weak association observed between dietary consumption of cholesterol and variation in plasma levels of lipid-lipoprotein produced consistent results according to some studies 31,39, but contradictory results according to others 41,42. These findings confirm that, despite high individual variability, the ingestion of cholesterol in the diet has a lower association with serum cholesterol than any other dietary component.

Concerning the supply of energy and ingestion of carbohydrates and proteins, no significant association between the presence of these dietary components and risk factors that cause a predisposition towards cardiovascular disease was found. Previous studies have offered evidence that a high level of carbohydrate consumption may result in increase triglyceride levels 43. Yet, besides the fact that this phenomenon was observed in short-term studies of six-months duration, other studies have not supported these findings 44,45.

To conclude, a similarity seems to exist between the findings of the present study and previous results obtained from controlled experiments involving information concerning levels of daily physical activity, cardiorespiratory fitness, dietary content, and risk factors that cause a predisposition towards cardiovascular disease. Yet, attention should be given to the possibility that other dietary components not considered in this study also favor risk factors through a variety of possible physiological mechanisms. For example, decreased sodium ingestion is associated with a reduction in arterial pressure due to less water retention by the organism 46. Moderate alcohol consumption can have some positive effects by increasing HDL-cholesterol levels. Within acceptable limits, each consumption of 10g of alcohol/day induces a 0.6-mg/dL increase of HDL-cholesterol levels 47. Certain kinds of soluble fibers, when consumed in large amounts, can reduce the levels of total- and LDL-cholesterol, possibly by acting on bile acids in the gut, increasing excretion of cholesterol and reducing the biosynthesis of LDL-cholesterol 48.

Furthermore, adding to the advantages associated with risk factors that cause a predisposition towards cardiovascular disease, the regular practice of physical activity can improve cardiac function by favoring oxygen supplementation and by increasing the electrical stability of the myocardium 49. Other potential benefits of such activity, which may aid in the prevention of and recovery from cardiovascular disease include increased glucose tolerance and decreased insulin sensitivity 50, reduction in platelet aggregation 51 and plasma fibrinogenesis 52. Such functional adaptations often fulfill a more important role than traditional risk factors proper and should, therefore, be considered in the analysis of the advantages of the regular practice of physical activity in terms of the reduction in the incidence of cardiovascular disease.

Finally, the close association between daily energy demand, maximal consumption of oxygen, fat ingestion, and risk factors that cause a predisposition towards cardiovascular disease observed in the present study reinforce the recommendation that regular physical exercise and adequate guidance for the ingestion of dietary lipid components should be integrated into programs for the primary prevention of cardiovascular diseases.

 

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