Effects of a school-based intervention to reduce cardiovascular disease risk factors in elementary-school children: the Cardiovascular Health in Children (CHIC) study

A controlled trial of health promotion programs in 11-year-olds using physical activity "enrichment" for higher risk children

OBJECTIVE

To evaluate the short and long term benefits of a school and home based physical activity "enrichment" program for children at higher risk of cardiovascular disease as identified by cluster analysis.

STUDY DESIGN

During two 10-week school terms, 800 11-year-olds took part in a randomized controlled trial with the standard physical activity and nutrition program in six schools, the standard program in a further seven schools but with the addition of physical activity enrichment for higher risk children in those schools, and no program in five control schools. Cluster analysis identifying the 29% or so highest risk children used systolic blood pressure, percent body fat, physical fitness, and blood cholesterol.

RESULTS

Fitness improved significantly in program schools, particularly with enrichment in higher risk boys. Substantial improvements persisted 6 months later in girls from program schools. At "Enrichment" schools, cholesterol showed significant benefits in higher risk girls and, 6 months later, in both boys and higher risk girls. Sodium intake and, in girls, subscapular skinfolds were lower in "Enrichment" schools when the program ended, but not 6 months later.

CONCLUSION

Two-semester health programs with physical activity enrichment for higher risk children can produce benefits sustained for at least 6 months. Improvements extend to lower risk children exposed indirectly to the enrichment. Attenuation of effects on diet and body composition in the longer-term suggest the need for on-going programs.

Cardiovascular disease insulin risk in Mexican-American and Anglo-American children and mothers

OBJECTIVE

To evaluate the relationship between insulin levels and cardiovascular risk factors in children and determine whether it varies among ethnic groups.

METHODS

Cardiovascular risk factors and insulin levels were compared in 144 Mexican-American and Anglo-American mother-child pairs, when the children were 11 years of age.

RESULTS

Although mean age did not differ between ethnicities, Mexican-American mothers and children both had a greater body mass index (mothers: 29.2 +/- 6.2 vs 27.2 +/- 7.9; children: 21.7 +/- 4.7 vs 19.7 +/- 4.6) and sum of skinfolds than did Anglo-Americans. Triglycerides, very low-density lipoprotein cholesterol, fasting insulin, and cholesterol/high-density lipoprotein ratio were higher, while high-density lipoprotein cholesterol was lower in both Mexican-American adults and children compared with Anglo-Americans. After adjusting for measures of obesity, only high-density lipoprotein cholesterol levels remained significantly lower in Mexican-Americans. For both adults and children, higher quartiles of insulin levels were associated with significantly higher triglycerides, blood pressure and lower high-density lipoprotein cholesterol, and low-density lipoprotein cholesterol/apolipoprotein B levels (estimate of dense low-density lipoprotein size). A summary variable representing cardiovascular risk factors present in adult syndrome X patients was higher in both Mexican-American adults and children than in Anglo-Americans.

CONCLUSION

Mexican-American children and adults have higher levels of many cardiovascular risk factors, and this appears related to higher insulin levels and overweight. Appropriate nutrition, weight control, and exercise at early ages could be important in slowing the development of atherosclerosis.

Leisure time activities of elementary school children

The three most common leisure time activities of 2,200 third and fourth grade children (mean age 8.8 + 0.8; 50.7% girls) and the association of the intensity levels of those activities with demographic variables and risk factors for cardiovascular disease are reported. Activities reported most often by boys were playing video games (33%), playing football (32%), bicycling (31%), watching television (28%), and playing basketball (26%). The girls reported doing homework (39%), bicycling (31%), watching television (30%), dancing (27%), and reading (23%). Overall, the children, especially girls, reported fairly sedentary activities, with an average metabolic equivalent level of 4.2 for girls and 4.8 for boys. Among boys, African Americans reported more vigorous activities than Whites, but the activities reported by White girls were somewhat more vigorous than those reported by non-White girls. Children from a higher socioeconomic status (SES), especially boys, reported a greater proportion of sedentary activities than lower SES children. The risk factors of cholesterol, blood pressure, skinfold thickness, and body mass index were not significantly associated with total activity score. However, significantly more nonobese than obese children reported a vigorous (high-intensity) activity as one of their top three activities.

Promotion of cardiovascular health in children by nurse practitioners and physicians in family practice

The purpose of this study was to describe cardiovascular (CV) health promotion practices of nurse practitioners (NPs) and physicians (MDs). Clinical practice was described for three age groups of children both with and without parental premature heart disease. Differences in clinical practice by type of provider and by age and risk level of the child were examined. A 42-question survey was mailed to all family NPs in North Carolina and to MDs randomly selected from the roster of the North Carolina Academy of Family Physicians; 94 responded. A high level of blood pressure measurement for all children and counseling regarding smoking for 13 to 19 year olds was found among all participants. Fewer health promotion activities were reported for other risk factors for the oldest group and for the younger children in general. Health promotion practices increased with the age of the child. Nurse practitioners had significantly higher total CV health promotion scores than did MDs, regardless of the age or risk level of the child. An increase in counseling about prudent diet and increased physical activity is needed for all children, regardless of risk level. In addition, there should be an increase in CV health promotion activities with younger children.