BACKGROUND AND OBJECTIVES:
Because there are no reference standards for body mass index (BMI) in Saudi children, we established BMI reference percentiles for normal Saudi Arabian children and adolescents and compared them with international standards.
SUBJECTS AND METHODS:
Data from a stratified multistage probability sample were collected from the 13 health regions in Saudi Arabia, as part of a nationwide health profile survey of Saudi Arabian children and adolescents conducted to establish normal physical growth references. Selected households were visited by a trained team. Weight and length/height were measured and recorded following the WHO recommended procedures using the same equipment, which were subjected to both calibration and intra/interobserver variations.
Survey of 11 874 eligible households yielded 35 275 full-term and healthy children and adolescents who were subjected to anthropometric measurements. Four BMI curves were produced, from birth to 36 months and 2 to 19 years for girls and boys. The 3rd, 5th, 10th, 25th, 50th, 75th, 85th, 90th, 95th, and 97th percentiles were produced and compared with the WHO and CDC BMI charts. In the higher percentiles, the Saudi children differed from Western counterparts, indicating that Saudi children have equal or higher BMIs.
The BMI curves reflect statistically representative BMI values for Saudi Arabian children and adolescents.
This study aims at providing local reference values for blood pressure by height and determining distribution pattern of systolic and diastolic blood pressure in 6.5-11.5 elementary school children for the first time in Shiraz (Southern Iran).
Height, systolic blood pressure (SBP) and diastolic blood pressure (DBP) were measured with standard methods in 2270 healthy school children (1174 boys, 1096 girls) who were selected by multi-stage random sampling in 2003-2004 academic years. We produced blood pressure percentiles by height percentiles using Healy-Rasbash-Yang method.
The blood pressure (both systolic and diastolic) tends to increase with age, but after adjusting the measurements for height no significant correlation was found between either systolic blood pressure or diastolic blood pressure and age (r=-0.03 and P=0.15 for systolic blood pressure, r=-0.005 and P=0.8 for diastolic blood pressure). Then systolic and diastolic blood pressure percentile values by age and height percentiles, and blood pressure smoothed centiles by height in 6.5-11.5 years school children were derived.
Due to genetic, cultural and environmental differences among populations, it is suggested to use local blood pressure standards in Iran. We produced blood pressure percentiles by height instead of age because it seems that it would lead to better evaluation for real hypertensive diagnosis.
Blood pressure; Height; Age; Children; Local Reference Value; Percentile
Canada is facing a childhood obesity epidemic. Elevated blood pressure (BP) is a major complication of obesity. Reports on the impact of excess adiposity on BP in children and adolescents have varied significantly across studies. We evaluated the independent effects of obesity, physical activity, family history of hypertension, and socioeconomic status on BP in a nationally representative sample of children and adolescents.
We analysed cross-sectional data for 1850 children aged 6 to 17 years who participated in the Canadian Health Measures Survey, Cycle 1, 2007–2009. Systolic BP (SBP) and diastolic BP (DBP) were age-, sex-, and height-adjusted to z-scores (SBPZ and DBPZ). Body mass index (BMI) z-scores were calculated based on World Health Organization growth standards. Multivariate linear regression was used to evaluate the independent effects of relevant variables on SBPZ and DBPZ.
For most age/sex groups, obesity was positively associated with SBP. Being obese was associated with higher DBP in adolescent boys only. The BP effect of obesity showed earlier in young girls than boys. Obese adolescents were estimated to have an average 7.6 mmHg higher SBP than normal weight adolescents. BMI had the strongest effect on BP among obese children and adolescents. Moderately active adolescent boys had higher SBP (3.9 mmHg) and DBP (4.9 mmHg) than physically active boys. Family history of hypertension showed effects on SBP and DBP in younger girls and adolescent boys. Both family income and parent education demonstrated independent associations with BP in young children.
Our findings demonstrate the early impact of excess adiposity, insufficient physical activity, family history of hypertension, and socioeconomic inequalities on BP. Early interventions to reduce childhood obesity can, among other things, reduce exposure to prolonged BP elevation and the future risk of cardiovascular disease.
To determine associations between body mass index (BMI) and sleep on blood pressure over a 5-year period from childhood to adolescence.
A longitudinal, community-based sample of 334 children recruited at ages 6 through 11 years. Each participant underwent in-home polysomnography initially and then 5 years later. Individual systolic (SBP) and diastolic (DBP) blood pressures were calculated at both time points during wake periods and classified as hypertensive if SBP or DBP was ≥ 95th standardized percentiles for height and weight.
Hypertension was present in 3.6% of the sample at time one and increased to 4.2% 5- years later. Obesity prevalence increased from 15.0% to 19.5%. Normal changes in sleep architecture were observed in the sample. Random effects modeling which controlled for age, sex and ethnicity indicated that change in obesity status and decrease in total sleep time were associated with increases in SBP. Change in obesity status was also associated with increases in DBP over the 5-year period. A trend for sleep-disordered breathing to increase SBP was noted.
Increases in SBP and DBP were associated with increasing BMI and decreased total sleep time over a 5-year period from childhood to adolescence.
BACKGROUND AND OBJECTIVES:
No previous study has provided a detailed description of regional variations of growth within the various regions of Saudi Arabia. Thus, we sought to demonstrate differences in growth of children and adolescents in different regions.
SUBJECTS AND METHODS:
The 2005 Saudi reference was based on a cross-sectional representative sample of the Saudi population of healthy children and adolescents from birth to 18 years of age. Body measurements of the length, stature, weight, head circumference and calculation of the BMI were performed according to standard recommendations. Percentile construction and smoothing were performed using the LMS (lambda, mu and sigma) methodology, followed by transformation of all individual measurements into standard deviation scores. Factors such as weight for age, height for age, weight for height, and head circumference for children from birth to 3 years, stature for age, head circumference and body mass index for children between 2-18 years of age were assessed. Subsequently, variations in growth between the three main regions in the north, southwest, and center of Saudi Arabia were calculated, with the Bonferroni: method used to assess the significance of differences between regions.
There were significant differences in growth between regions that varied according to age, gender, growth parameter and region. The highest variation was found between children and adolescents of the southwestern region and those of the other two regions The regression lines for all growth parameters in children <3 years of age were significantly different from one region to another reaching – 0.65 standard deviation scores for the southwestern regions (P=.001). However, the difference between the northern and central regions were not significant for the head circumference and for weight for length. For older children and adolescents a significant difference was found in all parameters except between the northern and central regions in BMI in girls and head circumference in boys. Finally, the difference in head circumference of girls between southwestern and northern regions was not significant. Such variation affected all growth parameters for both boys and girls.
Regional variations in growth need to be taken into consideration when assessing the growth of Saudi children and adolescents.
Background. Blood pressure (BP) percentiles in childhood are assessed according to age, gender, and height. Objective. To create a simple BP/height ratio for both systolic BP (SBP) and diastolic BP (DBP). To study the relationship between BP/height ratios and corresponding BP percentiles in children. Methods. We analyzed data on height and BP from 2006-2007 NHANES data. BP percentiles were calculated for 3775 children. Receiver-operating characteristic (ROC) curve analyses were performed to calculate sensitivity and specificity of BP/height ratios as diagnostic tests for elevated BP (>90%). Correlation analysis was performed between BP percentiles and BP/height ratios. Results. The average age was 12.54 ± 2.67 years. SBP/height and DBP/height ratios strongly correlated with SBP & DBP percentiles in both boys (P < 0.001, R2 = 0.85, R2 = 0.86) and girls (P < 0.001, R2 = 0.85, R2 = 0.90). The cutoffs of SBP/height and DBP/height ratios in boys were ≥0.75 and ≥0.46, respectively; in girls the ratios were ≥0.75 and ≥0.48, respectively with sensitivity and specificity in range of 83–100%. Conclusion. BP/height ratios are simple with high sensitivity and specificity to detect elevated BP in children. These ratios can be easily used in routine medical care of children.
In adults, hypertension has been shown to be inversely correlated with bone mineral content (BMC); however, the association between blood pressure (BP) and BMC has not been studied in pediatrics.
Total body BMC of 187 overweight (mean BMI=28.7 kg/m2) Latino children and adolescents (mean age=11.2 years) were measured using dual-energy x-ray absorptiometry. Seated systolic (SBP) and diastolic (DBP) blood pressure were measured using a standard mercury sphygmomanometer. Hypertension was defined by SBP or DBP above the 90th percentile for height, age, and gender.
Partial correlations revealed an inverse association between SBP and BMC (r=- 0.24, p=0.02) in boys (n=105); results were non-significant (p=0.27) in girls (n=82). There were no significant correlations between DBP and BMC. When BMI and insulin sensitivity were adjusted for, hypertensive boys (n=21) had lower BMC (1435 versus 1636 g; p=0.03) than normotensive boys (n=84); similarly, hypertensive girls (n=25) had lower BMC (1438 versus 1618 g; p=0.02) than normotensive girls (n=57). In post-pubertal adolescents (Tanner stage 4-5; n= 48), inverse correlations were stronger (r=- 0.40, p=0.007); results were non-significant in pre-pubertal and pubertal children (Tanner stage 1-3; n=139, p=0.57). In post-pubertal girls (n=37), there were no significant correlations (p=0.14); inverse correlations in post-pubertal boys (n=11) became markedly stronger (r= -0.80, p=0.02).
SBP is inversely correlated with BMC in overweight adolescents; additionally, hypertensives have lower adjusted means of BMC than normotensives. These promising new findings suggest that hypertension may be a risk factor for osteopenia in overweight children and adolescents; this risk may be exacerbated in post-pubertal boys.
Pediatric; Latino; Bone Mineral Content; Blood Pressure; Osteopenia
LITTLE IS KNOWN ABOUT BLOOD PRESSURE LEVELS and the extent of high blood pressure in Hispanic children and adolescents, especially in groups other than Mexican Americans. The authors of this study investigated the levels of systolic blood pressure (SBP) and diastolic blood pressure (DBP) and the extent of high blood pressure among Mexican-American, Cuban-American, and mainland Puerto Rican children and adolescents who participated in the Hispanic Health and Nutrition Examination Survey (HHANES). Very few children and adolescents in these three Hispanic groups had high normal or high blood pressure. Puerto Rican children had significantly lower DBP than Mexican-American (2.4 mmHg) and Cuban-American (1.8 mmHg) children. Their SBP was also lower (1.7 mmHg) than that of Cuban-American children. These findings should be interpreted cautiously, however, since a significant observer effect was also found in this study. Correlates of blood pressure in children in all three Hispanic groups were consistent with those found in studies of other ethnic groups. Age, body mass index, and pulse rate were significant predictors of both SBP and DBP (P less than 0.05). Gender was an important predictor of SBP but not DBP. Socioeconomic and cultural factors were not significant predictors of blood pressure in these Hispanic groups.
We determined the prevalence of general and central obesity and their relationship with blood pressure levels among adolescents in Abeokuta, Nigeria.
We selected 423 adolescents from seven schools in Abeokuta, Nigeria, using a multistage random-sampling technique. Body mass index (BMI), waist circumference (WC) and blood pressures were measured.
Twenty-one (5%) children had general obesity and 109 (24.5%) had central obesity. Of those with general obesity, 20 (95.1%) children were centrally obese. With simple linear regression analysis, BMI and WC explained 10.7 and 8.4%, respectively of the variance in systolic blood pressure (SBP), and 3.6 and 2.7%, respectively of the variance in diastolic blood pressure (DBP). Following logistic regression analysis, BMI was the major factor determining SBP levels (OR 0.8, 95% CI: 0.65–0.99, p < 0.05).
BMI remains an important anthropometric screening tool for high blood pressure in Nigerian adolescents.
overweight; obesity; central obesity; blood pressure; adolescents; Nigeria
The ages of onset of pubertal characteristics are influenced by genetic, geographic, dietary and socioeconomic factors; however, due to lack of country-specific norms, clinicians in Saudi Arabia use Western estimates as standards of reference for local children.
The aim of the Riyadh Puberty Study was to provide data on pubertal development to determine the average age of onset of pubertal characteristics among Saudi boys.
Cross-sectional study among male school children in Riyadh, Saudi Arabia, in 2006, 542 schoolboys, aged 6 to 16 years old, from diverse socioeconomic levels were selected into the sample using a cluster sample design. Tanner stages were ascertained during physical examination by pediatric endocrine consultants, and also trained pediatric residents and fellows.
The mean age (standard deviation) at Tanner Stages 2, 3, 4, and 5 for pubic hair development of Saudi boys was 11.4 (1.6), 13.3 (1.3), 14.4 (1.0) and 15.1 (0.8) years old, respectively. For gonadal development, the mean age (standard deviation) at stages 2, 3, 4, and 5 were 11.4 (1.5), 13.3 (1.2), 14.3 (1.1) and 15.0 (0.9) years old, respectively.
The ages of onset of pubertal characteristics, based on gonadal development, among Saudi boys are comparable to those reported in Western populations.
adolescence; boys; pubertal characteristics; puberty onset; Riyadh; Saudi Arabia
To assess associations between body size and blood pressure in children (5-6 years) from different ethnic origins.
Five ethnic groups of the ABCD cohort were examined: Dutch (n=1 923), Turkish (n=99), Moroccan (n=187), Black-African (n=67) and Black-Caribbean (n=121). Data on body-mass-index (BMI), waist-to-height ratio (WHtR), fat-mass-index (FMI), and systolic blood pressure (SBP) and diastolic blood pressure (DBP), were collected. Linear regression analysis with restricted cubic splines was used to examine non-linear associations between body size and blood pressure, adjusted for age, sex, height and birth weight.
Ethnic differences were found in associations of BMI with SBP and DBP (SBP: p=0.001 and DBP: p=0.01) and FMI with SBP (p=0.03). BMI and FMI had a relatively large positive association with SBP in Turkish children (BMI: β=2.46mmHg; 95%CI:1.20-3.72; FMI: β=2.41mmHg; 95%CI:1.09-3.73) compared to Dutch (BMI: β=1.31mmHg; 95%CI:0.71-1.92; FMI: β=0.84mmHg; 95%CI:0.23-1.45). Black-Caribbean and Moroccan children showed high blood pressure with low BMI and FMI. Moroccan children showed higher SBP with high BMI and FMI. WHtR was positively associated with SBP and DBP, similar in all ethnic groups. Generally, strongest associations with blood pressure were found for BMI in all ethnic groups.
Ethnic-specific associations between BMI, and FMI and blood pressure are present at young age, with Turkish children showing the highest increase in blood pressure with increasing body size. The higher blood pressure in the Black-Caribbean and Moroccan children with low BMI needs further research. WHtR or FMI do not seem to be associated more strongly to blood pressure than BMI in any ethnic group.
Blood pressure; Ethnicity; Children; Adiposity; Body size
The prevalence of obesity among children and adolescents increased by almost threefold from the 1970s to 2000. We examined whether these secular changes in BMI were accompanied by increases in blood pressure levels.
A total of 24 092 examinations were conducted among 11 478 children and adolescents (aged 5–17 years) from 1974 to 1993 in the Bogalusa Heart Study (Louisiana).
The prevalence of obesity increased from 6% to 17% during this period. In contrast, only small changes were observed in levels of systolic blood pressure (SBP) and diastolic blood pressure (DBP), and neither mean nor high (based on the 90th percentile from the Fourth Report on the Diagnosis, Evaluation, and Treatment of High Blood Pressure in Children and Adolescents) levels increased over the 20-year period. Within each race–gender group, mean levels of SBP did not change, whereas mean levels of DBP decreased by 2 mm Hg (P < .001 for trend). Levels of BMI were positively associated with levels of SBP and DBP within each of the 7 examinations, and controlling for BMI (along with other covariates) indicated that only ∼60% as many children as expected had high levels of blood pressure in 1993.
Our finding that levels of DBP and SBP among children in this large sample did not increase despite the increases that were seen in obesity indicates that changes in blood pressure levels in a population do not necessarily parallel changes in obesity. Additional study of the potential characteristics that have ameliorated the expected increase in high blood pressure could lead to further reductions in risk.
BMI; children; DBP; hypertension; obesity; SBP; secular trends
We examined the relationship between hypertension subtype and cardiovascular disease (CVD) incidence and mortality in Chinese adults.
Methods and Results
We conducted a prospective cohort study in a nationally representative sample of 169,871 Chinese men and women aged 40 years and older. Data on systolic (SBP) and diastolic blood pressure (DBP) and other variables were obtained at a baseline examination in 1991 using standard protocols. Follow-up evaluation was conducted in 1999–2000, with a response rate of 93.4%. Hypertension subtypes were defined as combined systolic and diastolic hypertension (SDH: SBP≥140 and DBP≥90 mm Hg), isolated systolic hypertension (ISH: SBP≥140 and DBP<90 mm Hg), isolated diastolic hypertension (IDH: SBP<140 and DBP≥90 mm Hg), and two categories of treated hypertension (SBP<140 and DBP<90 mm Hg or SBP≥140 and/or DBP≥90 mm Hg). After excluding participants with missing BP values, 169,577 adults were included in the analyses. Compared to normotensives, relative risks (95% confidence interval) of CVD incidence and mortality were 2.73 (2.60–2.86) and 2.53 (2.39–2.68) for SDH, 1.78 (1.69–1.87) and 1.68 (1.58–1.78) for ISH, 1.59 (1.43–1.76) and 1.45 (1.27–1.65) for IDH, 2.01 (1.64–2.48) and 1.61 (1.28–2.03) for treated hypertension with SBP<140 and DBP<90 mm Hg, and 3.37 (3.07–3.69) and 2.88 (2.60–3.19) for treated hypertension with SBP≥140 and/or DBP≥90 mm Hg, respectively, after adjustment for important covariables.
Our results indicate that all hypertension subtypes are associated with significantly increased risk of CVD in Chinese adults. Primary prevention of hypertension should be a public health priority in the Chinese population.
hypertension; cardiovascular disease; relative risk; Chinese
WE ASSESSED THE PREVALENCE of obesity, high normal blood pressure (BP), and the relationship between BP and anthropometric measurements in a sample of Navajo adolescents. The prevalence of obesity in boys and girls was 3 times that expected in U.S. white adolescents of the same age (17.1% for boys, 15.9% for girls) using body mass index as a criterion. The prevalence of high normal BP (between the 90th and 95th percentiles) was nearly twice that expected by definition (8.7% for boys and 9.1% for girls). Although systolic blood pressure (SBP) and diastolic blood pressure (DBP) increased significantly with age for boys and not for girls, SBP and DBP increased significantly with increasing body mass for both boys and girls. Given the high prevalence of obesity and the observed association with BP, primary prevention of hypertension among the Navajo should emphasize maintaining a healthy body weight at early ages.
Evaluate impact of breathing awareness meditation (BAM), Botvin LifeSkills® Training (LST), and health education control (HEC) on ambulatory blood pressure (BP) and sodium excretion in African American (AA) adolescents.
Following three consecutive days of systolic blood pressure (SBP) screenings, 166 eligible participants (i.e., SBP > 50th – 95th percentile) were randomized by school to either BAM (n = 53), LST (n= 69), or HEC (n=44). In-school intervention sessions were administered for three months by health education teachers. Before and after the intervention overnight urine samples and 24-hour ambulatory SBP, diastolic blood pressure (DBP), and heart rate (HR) were obtained.
Significant group differences were found for changes in overnight SBP and SBP, DBP and HR over the 24-hour period and during school hours. The BAM treatment exhibited the greatest overall decreases on these measures (Bonferroni adjusted, ps <.05). For example, for school-time SBP, BAM showed a change of −3.7 mmHg compared to no change for LST and a change of −0.1 mmHg for HEC. There was a non-significant trend for overnight urinary sodium excretion (p = .07) with the BAM group displaying a reduction of −.92 ± 1.1 mEq/hr compared to increases of .89 ± 1.2 mEq/hr for LST, and .58±0.9 mEq/hr for HEC group.
BAM appears to improve hemodynamic function and may impact sodium handling among AA adolescents at increased risk for development of cardiovascular disease (CVD).
adolescents; ambulatory blood pressure; breathing awareness meditation; Botvin LifeSkills® Training; clinical trial; sodium excretion
The obesity and hypertension are the major risk factors of several life threatening diseases. The present study was aimed to investigate the relation between body mass index (BMI) the validated index of adiposity and different aspect of blood pressure (BP).
Systolic and diastolic blood pressures and also weight and height of 7 to 18 years old children and adolescent collected in 2002 and 2004 respectively. Data was consisted of 14865 schoolchildren and adolescents from representative sample of country. BMI was classified according to CDC 2000 standards into normal (BMI<85th percentile), at risk of overweight (BMI≥85th and <95th percentile) and overweight (BMI≥95th percentile). Then, age-sex specific prevalence of being overweight was derived. ANOVA was used to investigate the effect of BMI on systolic blood pressure and diastolic blood pressure and mean arterial pressure of participants.
Mean systolic blood pressure (SBP), diastolic blood pressure (DBP) and mean arterial blood pressure (MAP) significantly increased with BMI (P< 0.0001) and age groups (P< 0.0001), and was significantly (P< 0.0001) higher in boys than girls especially in older ages. (P< 0.0001, interaction of age and BMI level). The proportion of being overweight was significantly higher in boys than girls was (7.4% vs. 3.6%; P< 0.0001).
There is an association between BP and BMI in children and adolescence. SBP, DBP and MAP are associated with rise in BMI and age, which was lower in girls. This data can provide basics for public health policy makers and primary prevention policies in the country.
Blood pressure; Body mass index (BMI); Relation; Children; Adolescents
To study the blood pressure of school going children in a rural area and its relationship with the anthropometric indices.
A prospective, cross-sectional study was carried out from November 2006 to December 2007 in the school going children between the ages of 6–17 years from eight different schools in the rural areas of Wardha district. The height, weight, systolic blood pressure (SBP), and diastolic blood pressure (DBP) were recorded in both sexes followed by complete clinical examination with special emphasis on cardiovascular system. Hypertension (HT) was defined as SBP or DBP exceeding the 95th percentile for age, gender, and height on at least three separate occasions, 1–3 weeks apart. SPSS software was used to analyze the data. Coefficient correlation tests were employed to assess the relation between BP and anthropometric variables.
Of 2643 school children, 1227 were boys and 1416 girls with a male to female ratio of 1:1.16. In boys, SBP and DBP increased with age except a marginal decline in SBP at the age of 17 years (−0.09) and decrease in the DBP (−1.29) at 16 years of age. In girls, SBP and DBP also increased with age except at 11 years, wherein there was a mild decrease in SBP (−0.09) as well as the DBP (−0.24). Correlation coefficient analysis showed highly significant positive correlation of height with SBP and DBP. There was a significant correlation of SBP and DBP with the weight, and body mass index (BMI). The prevalence of HT was 5.75% (i.e., 3.25% for systolic HT and 2.49% for diastolic HT).
We recommend that there is a need for checking BP to detect HT in children, so that remedial measures can be initiated as early as possible.
Blood pressure; children; hypertension; prevalence study
Little is known about normative variation in stress response over the adolescent transition. This study examined neuroendocrine and cardiovascular responses to performance and peer rejection stressors over the adolescent transition in a normative sample. Participants were 82 healthy children (ages 7-12 years, n=39, 22 females) and adolescents (ages 13-17, n=43, 20 females) recruited through community postings. Following a habituation session, participants completed a performance (public speaking, mental arithmetic, mirror tracing) or peer rejection (exclusion challenges) stress session. Salivary cortisol, alpha amylase (sAA), systolic and diastolic blood pressure (SBP, DBP), and heart rate (HR) were measured throughout. Adolescents showed significantly greater cortisol, sAA, SBP and DBP stress response relative to children. Developmental differences were most pronounced in the performance stress session for cortisol and DBP, and in the peer rejection session for sAA and SBP. Heightened physiological stress responses in typical adolescents may facilitate adaptation to new challenges of adolescence and adulthood. In high-risk adolescents, this normative shift may tip the balance toward stress response dysregulation associated with depression and other psychopathology. Specificity of physiological response by stressor type highlights the importance of a multi-system approach to the psychobiology of stress and may also have implications for understanding trajectories to psychopathology.
adolescent; child; stress; cortisol; cardiovascular; amylase; depression
There are limited data on regional variation of overweight and obesity in the Kingdom of Saudi Arabia. Therefore, the aim of this report is to explore the magnitude of these variation in order to focus preventive programs to regional needs.
Setting and Design:
Community-based multistage random sample of representative cohort from each region.
Patients and Methods:
the study sample was cross-sectional, representative of healthy children and adolescents from 2 to 17 years of age. Body mass index (BMI) was calculated according to the formula (weight/height2). The 2000 center for disease control reference was used for the calculation of prevalence of overweight and obesity defined as the proportion of children and adolescents whose BMI for age was above 85th and 95th percentiles respectively, for Northern, Southwestern and Central regions of the Kingdom. Chi-square test was used to assess the difference in prevalence between regions and a P value of <0.05 was considered significant.
The sample size was 3525, 3413 and 4174 from 2-17 years of age in the Central, Southwestern and Northern regions respectively. The overall prevalence of overweight was 21%, 13.4% and 20.1%, that of obesity was 9.3%, 6% and 9.1% in the Central, Southwestern and Northern regions respectively indicating a significantly-lower prevalence in the Southwestern compared to other regions (P<0.0001).
This report revealed significant regional variations important to consider in planning preventive and therapeutic programs tailored to the needs of each region.
Obesity; prevalence of overweight; regional variations; Saudi children
The association of physical activity (PA), measured three ways, and biomarkers were compared in a sample of adolescents.
PA data were collected on two cohorts of adolescents (N=700) in the Twin Cities, Minnesota, 2007–2008. PA was measured using two survey questions (Modified Activity Questionnaire (MAQ)), the 3-Day Physical Activity Recall (3DPAR), and accelerometers. Biomarkers included systolic (SBP) and diastolic blood pressure (DBP), lipids, percent body fat (%BF) and body mass index (BMI) percentile. Bivariate relationships among PA measures and biomarkers were examined followed by generalized estimating equations for multivariate analysis.
The three measures were significantly correlated with each other (r=0.22–0.36, P<0.001). Controlling for study, puberty, age and gender, all three PA measures were associated with %BF (MAQ=-1.93, P<0.001; 3DPAR=-1.64, P <0.001; accelerometer=-1.06, P =0.001). The MAQ and accelerometers were negatively associated with BMI percentile. None of the three PA measures were significantly associated with SBP or lipids. The percentage of adolescents meeting the national PA recommendations varied by instrument.
All three instruments demonstrated consistent findings when estimating associations with %BF, but were different for prevalence estimates. Researchers must carefully consider the intended use of PA data when choosing a measurement instrument.
In southern and eastern Mediterranean countries, changes in lifestyle and the increasing prevalence of excess weight in childhood are risk factors for high blood pressure (BP) during adolescence and adulthood. The aim of this study was to evaluate the BP status of Tunisian adolescents and to identify associated factors.
A cross-sectional study in 2005, based on a national, stratified, random cluster sample of 1294 boys and 1576 girls aged 15-19 surveyed in home visits. The socio-economic and behavioral characteristics of the adolescents were recorded. Overweight/obesity were assessed by Body Mass Index (BMI) from measured height and weight (WHO, 2007), abdominal obesity by waist circumference (WC). BP was measured twice during the same visit. Elevated BP was systolic (SBP) or diastolic blood pressure (DBP) ≥ 90th of the international reference or ≥ 120/80 mm Hg for 15-17 y., and SBP/DBP ≥ 120/80 mm Hg for 18-19 y.; hypertension was SBP/DBP ≥ 95th for 15-17 y. and ≥ 140/90 mm Hg for 18-19 y. Adjusted associations were assessed by logistic regression.
The prevalence of elevated BP was 35.1%[32.9-37.4]: higher among boys (46.1% vs. 33.3%; P < 0.0001); 4.7%[3.8-5.9] of adolescents had hypertension. Associations adjusted for all covariates showed independent relationships with BMI and WC: - obesity vs. no excess weight increased elevated BP (boys OR = 2.1[1.0-4.2], girls OR = 2.3[1.3-3.9]) and hypertension (boys OR = 3.5[1.4-8.9], girls OR = 5.4[2.2-13.4]), - abdominal obesity (WC) was also associated with elevated BP in both genders (for boys: 2nd vs. 1st tertile OR = 1.7[1.3-2.3], 3rd vs.1st tertile OR = 2.8[1.9-4.2]; for girls: 2nd vs. 1st tertile OR = 1.6[1.2-2.1], 3rd vs.1st tertile OR = 2.1[1.5-3.0]) but only among boys for hypertension. Associations with other covariates were weaker: for boys, hypertension increased somewhat with sedentary lifestyle, while elevated BP was slightly more prevalent among urban girls and those not attending school.
Within the limits of BP measurement on one visit only, these results suggest that Tunisian adolescents of both genders are likely not spared from early elevated BP. Though further assessment is likely needed, the strong association with overweight/obesity observed suggests that interventions aimed at changing lifestyles to reduce this main risk factor may also be appropriate for the prevention of elevated BP.
Adolescent; Blood pressure; Tunisia; Prevalence; Risk factors
Cardiovascular disease (CVD) is the leading cause of death among older people in Africa. This study aimed to investigate the relationship of urbanization and ethnicity with CVD risk markers in Kenya.
A cross-sectional population-based survey was carried out in Nakuru Kenya in 2007-2008. 100 clusters of 50 people aged ≥50 years were selected by probability proportionate to size sampling. Households within clusters were selected through compact segment sampling. Participants were interviewed by nurses to collect socio-demographic and lifestyle information. Nurses measured blood pressure, height, weight and waist and hip circumference. A random finger-prick blood sample was taken to measure glucose and cholesterol levels.
Hypertension was defined as systolic blood pressure (SBP) ≥140 mm Hg, or diastolic blood pressure (DBP) ≥90 mm Hg or current use of antihypertensive medication; Diabetes as reported current medication or diet control for diabetes or random blood glucose level ≥11.1 mmol/L; High cholesterol as random blood cholesterol level ≥5.2 mmol/L; and Obesity as Body Mass Index (BMI)≥30 kg/m2.
5010 eligible subjects were selected, of whom 4396 (88%) were examined. There was a high prevalence of hypertension (50.1%, 47.5-52.6%), obesity (13.0%, 11.7-14.5%), diabetes (6.6%, 5.6-7.7%) and high cholesterol (21.1%, 18.6-23.9). Hypertension, diabetes and obesity were more common in urban compared to rural groups and the elevated prevalence generally persisted after adjustment for socio-demographic, lifestyle, obesity and cardiovascular risk markers. There was also a higher prevalence of hypertension, obesity, diabetes and high cholesterol among Kikuyus compared to Kalenjins, even after multivariate adjustment. CVD risk markers were clustered both across the district and within individuals. Few people received treatment for hypertension (15%), while the majority of cases with diabetes received treatment (68%).
CVD risk markers are common in Kenya, particularly in urban areas. Exploring differences in CVD risk markers between ethnic groups may help to elucidate the epidemiology of these conditions.
Increase in the prevalence of hypertension, obesity and obesity related diseases has become significant cause of disability and premature death in both developing and newly developed countries, with over bearing demand on national health budgets.
To evaluate the impact of various levels of education on obesity and blood pressure.
Materials and Method:
325 male and 254 female Nigerians of ages 20-80 years of the Ibo ethnicity through random sampling, were selected for this study. The participants were broken into three major groups based on their educational levels; primary, secondary and tertiary levels. systolic and diastolic blood pressure (SBP & DBP) levels, body mass index (BMI), waist hip ratio (WHR), waist height ratio (WHtR), waist circumference (WC),various skin fold thicknesses, and other anthropometric parameters were measured.
For all the indicators of subcutaneous fat, general obesity, and central obesity, largest mean deposition was noted to be highest in the lowest education group and least in the highest education group. Mean blood pressure parameters were also highest in the least education group. While fat deposition was noted to be highest in all the females of all the groups, the males showed larger mean BP values. Education was noted to have a significant inverse relationship with most of the fat indicators and blood pressure parameters and cardiovascular disease risk highest in the least education groups.
Education showed a significant impact on obesity and blood pressure and could be one of the major tools to reduce the high prevalence of obesity, hypertension and other obesity associated diseases.
Anthropometry; obesity; adiposity; blood pressure; BMI; obesity prevalence; obesity related disorder; hypertension; cardiovascular disease risk; waist hip ratio
To determine the association between heart rate variability (HRV) and hypertension in Chinese children.
The study was conducted in First Hospital of Jilin University, China. A total of 101 children were recruited in this study. They were divided into a high systolic blood pressure (SBP) group (HS group) and normal SBP group (NS group) according to the SBP levels. In the second set of experiments, the children were divided into a high diastolic blood pressure (DBP) group (HD group) and normal DBP group (ND group) according to the DBP levels. HRV measurements were performed, and the time domain and power spectrum values were calculated.
The differences of low frequency (LF)/high frequency (HF) ratio, HF, and standard deviation of normal-to-normal RR intervals (SDNN) between daytime and nighttime were obviously abolished in HS and HD groups. The HS group displayed significantly lower values of HRV over a 24 h period compared to the NS group (SDNN, standard deviation of the averaged normal-to-normal RR intervals [SDANN], Triangle Index, root mean square successive difference [RMSSD], total power [TP], ultra-LF [ULF], and HF). Only the Triangle Index in the HD group was lower than that in ND group.
We provide evidence that HRV is reduced and the circadian rhythm of HRV is weakened in hypertensive children, and hypothesize that a reduced HRV is a potential pathophysiological mechanism linking childhood hypertension and adulthood cardiovascular diseases.
Heart Rate; Blood Pressure; Hypertension; Children
Background and Purpose
On average, systolic blood pressure (SBP) rises with age, while diastolic blood pressure (DBP) increases to age 50 and then declines. As elevated blood pressure is associated with cardiovascular disease and mortality, it also might be linked to frailty. We assessed the association between blood pressure, age, and frailty in a representative population-based cohort.
Individuals from the second clinical examination of the Canadian Study of Health and Aging (n = 2305, all 70+ years) were separated into four groups: history of hypertension ± antihypertensive medication, and no history of hypertension ± antihypertensive medication. Frailty was quantified as deficits accumulated in a frailty index (FI).
SBP and DBP changed little in relation to age, except in untreated hypertension, where SBP declined in individuals >85 years. In contrast, SBP declined in all groups up to an FI of 0.55, and then rose sharply. DBP changed little in relation to FI. The slope of the line relating FI and age was highest in untreated individuals without a history of hypertension, indicating the highest physiological reserve.
SBP declined as frailty increased in older adults, except at the highest FI levels. SBP and age had little or no relationship.
aging; hypertension; frailty