Obesity and elevated blood pressure among adolescents in Lagos, Nigeria: a cross-sectional study

Overweight and obesity among female adolescents in Nigeria; an emerging, but under-reported epidemic

BACKGROUND

Overweight and obesity are increasing at epidemic levels in all ages globally, but there is little nationally representative data on female adolescents in Nigeria. The focus on female adolescents is important because of the negative implications of overweight and obesity on their health and survival, and that of their unborn children.

AIM

To estimate the prevalence and identify the determinants of overweight and obesity among female adolescents in Nigeria.

METHODS

Cross-sectional study using data from the Nigeria demographic and health survey, 2018. A total of 2,721 female adolescents aged 15-19 years were selected using cluster sampling technique. Overweight and obesity were determined using BMI-for-age reference values of World Health Organization and different explanatory variables at the individual, household and community levels were included. Binary logistic regression analysis was used to identify the determinants of overweight/obesity using five models.

RESULTS

The mean age of the respondents was 16.8 ± 1.4 years. The prevalence rate of overweight/obesity was 10.2%, but with a large variation in the geographical and socio-economic distribution. At the crude/unadjusted rate, nearly all the explanatory variables showed a statistically significant association with overweight and obesity, but at the full model which controlled for all the explanatory variables, only the household wealth index retained its statistically significant association, such that female adolescents who were from richer and richest households had about 3 times higher odds of being obese compared to those from the poorest households. (OR: 2.7; p = 0.018; CI: 1.18-6.18), (OR: 2.8; p = 0.027; CI: 1.13-7.06) respectively.

CONCLUSION

The prevalence of overweight/obesity among female adolescents in Nigeria was 10.2%. The household wealth index remained the only factor with a statistically significant association with overweight and obesity after controlling for confounders. Efforts at addressing overweight and obesity among female adolescents in Nigeria should target those from the richer/richest households.

Elevated blood pressure among adolescents in sub-Saharan Africa: a systematic review and meta-analysis

BACKGROUND

More people from sub-Saharan Africa aged between 20 years and 60 years are affected by end-organ damage due to underlying hypertension than people in high-income countries. However, there is a paucity of data on the pattern of elevated blood pressure among adolescents aged 10-19 years in sub-Saharan Africa. We aimed to provide pooled estimates of high blood pressure prevalence and mean levels in adolescents aged 10-19 years across sub-Saharan Africa.

METHODS

In this systematic review and meta-analysis, we searched PubMed, Google Scholar, African Index Medicus, and Embase to identify studies published from Jan 1, 2010, to Dec 31, 2021. To be included, primary studies had to be observational studies of adolescents aged 10-19 years residing in sub-Saharan African countries reporting the pooled prevalence of elevated blood pressure or with enough data to compute these estimates. We excluded studies on non-systemic hypertension, in African people not living in sub-Saharan Africa, with participant selection based on the presence of hypertension, and with adult cohorts in which we could not disaggregate data for adolescents. We independently extracted relevant data from individual studies using a standard data extraction form. We used a random-effects model to estimate the pooled prevalence of elevated blood pressure and mean systolic blood pressure (SBP) and diastolic blood pressure (DBP) levels overall and on a sex-specific basis. This study is registered with PROSPERO (CRD42022297948).

FINDINGS

We identified 2559 studies, and assessed 81 full-text studies for eligibility, of which 36 studies comprising 37 926 participants aged 10-19 years from ten (20%) of 49 sub-Saharan African countries were eligible. A pooled sample of 29 696 adolescents informed meta-analyses of elevated blood pressure and 27 155 adolescents informed meta-analyses of mean blood pressure. Sex data were available from 26 818 adolescents (14 369 [53·6%] were female and 12 449 [46·4%] were male) for the prevalence of elevated blood pressure and 23 777 adolescents (12 864 [54·1%] were female and 10 913 [45·9%] were male) for mean blood pressure. Study quality was high, with no low-quality studies. The reported prevalence of elevated blood pressure ranged from 4 (0·2%) of 1727 to 1755 (25·1%) of 6980 (pooled prevalence 9·9%, 95% CI 7·3-12·5; I?=99·2%, p_{heterogeneity}<0·0001). Mean SBP was 111 mm Hg (95% CI 108-114) and mean DBP was 68 mm Hg (66-70). 13·4% (95% CI 12·9-13·9; p_{heterogeneity}<0·0001) of male participants had elevated blood pressure compared with 11·9% (11·3-12·4; p_{heterogeneity}<0·0001) of female participants (odds ratio 1·04, 95% CI 0·81-1·34; p_{heterogeneity}<0·0001).

INTERPRETATION

To our knowledge, this systematic review and meta-analysis is the first systematic synthesis of blood pressure data specifically derived from adolescents in sub-Saharan Africa. Although many low-income countries were not represented in our study, our findings suggest that approximately one in ten adolescents have elevated blood pressure across sub-Saharan Africa. Accordingly, there is an urgent need to improve preventive heart-health programmes in the region.

FUNDING

None.

Impact of the 2017 AAP clinical guideline on the prevalence of high blood pressure among adolescents in Lagos, Nigeria

Introduction

Adolescent high blood pressure (HBP) can lead to several end-organ complications if it continues into adulthood. The 2017 AAP Guideline has lower blood pressure cut-off points and consequently leads to the identification of more people with high blood pressure. This study evaluated the impact of the 2017 American Academy of Pediatrics (AAP) Clinical Guideline on the prevalence of high blood pressure among adolescents when compared to the 2004 Fourth Report.

Methodology

A descriptive cross-sectional study was conducted from August 2020 to December 2020. The selection of 1,490 students, 10-19 years old, was by a two-stage sampling technique. Socio-demographic information and relevant clinical data were obtained using a structured questionnaire. Blood pressure was measured according to standard protocol. Categorical and numerical variables were summarized using frequency, percentages, mean, and standard deviation. The McNemar-Bowker test of symmetry was used to compare the blood pressure values in the 2004 Fourth Report and the 2017 AAP Clinical Guideline. The Kappa statistic was used to test for the degree of agreement between the 2004 Fourth Report and the 2017 AAP Clinical Guideline.

Results

The prevalence rates of high blood pressure, elevated blood pressure, and hypertension among adolescents were 26.7%, 13.8%, and 12.9%, respectively, using the 2017 AAP Clinical Guideline, and 14.5%, 6.1%, and 8.4%, respectively, using the 2004 Fourth Report. The degree of agreement between the 2004 and 2017 guidelines with respect to the classification of blood pressure was 84.8%. The Kappa statistic was 0.71 (CI: 0.67-0.75). The impact of this was a 12.2%, 7.7%, and 4.5% increase in the prevalence of high blood pressure, elevated blood pressure, and hypertension, respectively, using the 2017 AAP Clinical Guideline.

Conclusion

The 2017 AAP Clinical Guideline detects a greater proportion of high blood pressure among adolescents. The adoption of this new guideline in clinical practice and its use in the routine screening of high blood pressure among adolescents is recommended.

High blood pressure pattern amongst adolescents in Lagos, South West Nigeria

Introduction

high blood pressure (HBP), once considered rare in adolescents is now a growing health problem. Usually asymptomatic in adolescents, if uncontrolled, can track into adulthood leading to various end-organ complications. In 2017, the American Academy of Pediatrics (AAP) published a new Clinical Practice Guideline (CPG) for screening and management of high blood pressure in children and adolescents to update the 2004 Fourth report. The objective of this study was to determine the prevalence of high blood pressure among adolescents in Mushin Local Government Area (LGA) using the 2017 AAP guidelines.

Methods

a descriptive cross-sectional study, conducted from August 2020 to December 2020. A two-stage sampling technique was used to select 1490 students aged 10 to 19 years, from 14 secondary schools. Socio-demographic information and relevant clinical data were obtained using a structured questionnaire. The anthropometry and blood pressure measurements were taken according to standard protocol (elevated blood pressure is systolic and/or diastolic blood pressure ≥ 90^th percentile but ≤ 95^th percentile for age, gender and height). Socio-demographic and anthropometric characteristics were described with descriptive statistics. Categorical variables were summarized using frequency and percentages, while numerical variables were summarized using mean and standard deviation. The predictors of hypertension were determined using logistic regression analysis.

Results

study participants were 1490, 49.9% (744) were male and 50.1% (746) females (male: female ratio was 1: 1). Subjects mean age was 14.39 ± 2.79 years. There were 8.9% overweight and 1.7% obese participants. Prevalence of high blood pressure, elevated blood pressure and hypertension were 26.7% (n = 398), 13.8% (n = 205), and 12.9% (n = 193). Middle and late adolescence, when compared to early adolescence, significantly predicted the likelihood of high blood pressure; aOR 1.78, 95%CI: 1.20 - 2.63, p=0.004 and 3.90 (2.69 - 5.67, p=0.001 respectively). Similarly, male sex had increased odds for raised blood pressure when compared to female sex aOR 1.49,95% CI: 1.1 - 2.0, p= 0.009.

Conclusion

the prevalence of high blood pressure, elevated blood pressure and hypertension amongst adolescents was high. Early detection and treatment will forestall development of complications.

Individual and contextual factors associated with under- and over-nutrition among school-aged children and adolescents in two Nigerian states: a multi-level analysis

OBJECTIVE

This study aimed to identify individual and contextual factors that are associated with under- and over-nutrition among school-aged children and adolescents in two Nigerian states.

DESIGN

Community-based cross-sectional study.

SETTING

The study was carried out in rural and urban communities of Osun and Gombe States in Nigeria.

PARTICIPANTS

A total of 1200 school-aged children and adolescents.

RESULTS

Multi-level analysis showed that the full models accounted for about 82 % and 39 % of the odds of thinness or overweight/obese across the communities, respectively. Household size (adjusted OR (aOR) 1·10; P = 0·001; 95 % CI (1·04, 1·16)) increased the odds, while the upper wealth index (aOR 0·43; P = 0·016; 95 % CI (0·22, 0·86)) decreased the odds of thinness. Age (aOR 0·86; P < 0·001; 95 % CI (1·26, 8·70)), exclusive breastfeeding (aOR 0·46; P = 0·010; 95 % CI (0·25, 0·83)), physical activity (aOR 0·55; P = 0·001; 95 % CI (0·39, 0·78)) and the upper wealth index (aOR 0·47; P = 0·018; 95 % CI (0·25, 0·88)) were inversely related with overweight/obesity, while residing in Osun State (aOR 3·32; P = 0·015; 95 % CI (1·26, 1·70)), female gender (aOR 1·73; P = 0·015; 95 % CI (1·11, 2·69)) and screen time > 2 h/d (aOR 2·33; P = 0·005; 95 % CI (1·29, 4·19)) were positively associated with overweight/obesity.

CONCLUSIONS

The study shows that selected community and individual-level factors are strongly associated with thinness and overweight/obesity among school-aged children and adolescents.

Impact of Weight Reduction on Thyroid Function and Nonalcoholic Fatty Liver among Egyptian Adolescents with Obesity

BACKGROUND

The prevalence of childhood obesity has been increasing worldwide. This may explain the emergence of nonalcoholic fatty liver as the leading cause of liver disease. Several previous studies have addressed the association between thyroid function and nonalcoholic fatty liver disease.

OBJECTIVES

To study the impact of weight reduction through lifestyle modifications in adolescents with obesity.

METHODS

A prospective cohort study was done on 61 adolescents with obesity. Patients were evaluated at the first visit by the full history, clinical examination, and investigations (thyroid profile, lipid profile, liver function tests, HbA1c, and liver ultrasonography) as basal information. The intervention program included a dietary program, increasing physical activity, and decreasing sedentary activity. A postintervention evaluation was done at the end of six months which included anthropometric measures, laboratory results, and ultrasonographic estimation.

RESULTS

It was shown that the mean BMI of the participants had significantly decreased after lifestyle modification from (32.05 ± 3.36 kg/m2) to (28.1 ± 2.77 kg/m2) (P < 0.001). It also showed that the percentage of studied adolescents with elevated TSH decreased from 47.5% to 19.7% after the weight reduction program. Improvement was also achieved in the lipid profile and liver functions. The percentage of studied adolescents with ultrasound appearance of NAFLD decreased from 31.1% to 26.2% after weight reduction.

CONCLUSIONS

Lifestyle modification positively influences the metabolic derangement in obesity without medical treatment. ΔTSH is a significant predictor of the change in BMI z-score. It is also possible that hepatic steatosis affects thyroid function rather than the other way around.

Double burden of malnutrition among school-aged children and adolescents: evidence from a community-based cross-sectional survey in two Nigerian States

Background: Double burden of malnutrition (DBM) is the co-existence of overweight/obesity and undernutrition. Rising prevalence rates of childhood overweight/obesity in Nigeria have been reported, whilst undernutrition continues to be prevalent. This study aimed to estimate the prevalence and distribution of underweight, stunting, thinness, overweight/obesity, and DBM among school-aged children and adolescents in two Nigerian States. Methods: This was a community-based cross-sectional study carried out in Osun and Gombe States. A total of 1,200 children aged 6 - 19 years were recruited using multi-stage sampling technique. Weight, height and data on demographic, socio-economic, household/family characteristics of the children were collected using structured interviewer administered questionnaires. Nutritional status was calculated using the WHO 2007 reference values using BMI-for-age (thinness, overweight/obesity), height-for-age (stunting) and weight-for-age (underweight). DBM was described at the population and individual levels. Results: The mean age of the respondents was 11.6 ± 3.8 years. The overall prevalence rate of stunting was 34.9%, underweight was 13.5%, thinness was 10.3% and overweight/obese was 11.4% and 4.0% had individual level DBM, which typifies the DBM at individual and population levels. These rates differed significantly across demographic, socio-economic and household/family characteristics (p < 0.05). Gombe State, which is in the Northern part of Nigeria, had significantly higher burden of stunted, underweight and thin children than Osun State, while Osun State, in the Southern part of Nigeria, had a significantly higher burden of overweight/obesity. Conclusions: The study found evidence of DBM both at population and individual levels. The overall prevalence rates of stunting, underweight, thinness and overweight/obesity in this study were high, and they differed significantly across the demographic, socio-economic and household/family characteristics. There is the need for government and all other stakeholders to design nutritional educational programmes that will target both under- and over-nutrition among older children in the different contexts.

How Does Being Overweight Moderate Associations between Diet and Blood Pressure in Male Adolescents?

Diet is one of the strongest modifiable risk factors for hypertension. In this study, we described the associations between dietary factors and blood pressure; and explored how weight status moderated these associations in a sample of New Zealand male adolescents. We collected demographics information, anthropometric, blood pressure, and dietary data from 108 male adolescents (15–17 years old). Mixed effects and logistic regression models were used to estimate relationships between dietary variables, blood pressure, and hypertension. Moderation effects of overweight status on the relationship between hypertension and diet were explored through forest plots. One-third (36%) of the sample was classified as hypertensive. Fruit intake was related to significantly lower systolic (−2.4 mmHg, p = 0.005) and diastolic blood pressure (−3.9 mmHg, p = 0.001). Vegetable and milk intake was related to significantly lower diastolic blood pressure (−1.4 mmHg, p = 0.047) and (−2.2 mmHg, p = 0.003), respectively. In overweight participants, greater vegetable and milk, and lower meat intake appeared to reduce the odds of hypertension. Certain dietary factors may have more prominent effects on blood pressure depending on weight status.

Epidemiology of physical inactivity in Nigeria: a systematic review and meta-analysis

Background

Physical activity is crucial to preventing noncommunicable diseases. This study aimed to provide up-to-date evidence on the epidemiology of insufficient physical activity across Nigeria to increase awareness and prompt relevant policy and public health response.

Methods

A systematic literature search of community-based studies on physical inactivity was conducted. We constructed a meta-regression epidemiologic model to determine the age-adjusted prevalence and number of physically inactive persons in Nigeria for 1995 and 2020.

Results

Fifteen studies covering a population of 13 814 adults met our selection criteria. The pooled crude prevalence of physically inactive persons in Nigeria was 52.0% (95% CI: 33.7–70.4), with prevalence in women higher at 55.8% (95% CI: 29.4–82.3) compared to men at 49.3% (95% CI: 24.7–73.9). Across settings, prevalence of physically inactive persons was significantly higher among urban dwellers (56.8%, 35.3–78.4) compared to rural dwellers (18.9%, 11.9–49.8). Among persons aged 20–79 years, the total number of physically inactive persons increased from 14.4 million to 48.6 million between 1995 and 2020, equivalent to a 240% increase over the 25-year period.

Conclusions

A comprehensive and robust strategy that addresses occupational policies, town planning, awareness and information, and sociocultural and contextual issues is crucial to improving physical activity levels in Nigeria.

Prevalence, incidence, and trends of childhood overweight/obesity in Sub-Saharan Africa: a systematic scoping review

BACKGROUND

The growing burden of non-communicable diseases (NDC), particularly in low-and middle-income countries, poses a significant threat to global health. Obesity and overweight constitute major risk factors of NCDs such as heart diseases, diabetes, and kidney disease, and as a result, contribute significantly to the development of chronic morbidities, reduced quality of life, and increased risk of premature death. This study described evidence on the prevalence, incidence, and trends of childhood overweight and obesity in sub-Sahara Africa (SSA).

METHODS

We conducted a systematic scoping review employing the Arksey and O'Malley framework, Levac et al. recommendations, and the Joanna Briggs Institute guidelines. To obtain relevant published articles for this review, we performed a comprehensive keywords search in PubMed, Google Scholar, Web of Science, and CINAHL via EBSCOhost platform for studies published between 2009 and June 2019. Guided by the eligibility criteria, title and abstracts, as well as the full-text articles were independently screened in parallel by two investigators. All relevant data were independently extracted by two investigators using a piloted form designed in Microsoft and thematic analysis conducted.

RESULTS

Of the 81 included studies obtained from 250,148 potentially eligible articles, the majority (25) conducted in South Africa followed by 18 in Nigeria. Six studies were conducted in Ethiopia (6), Tanzania (5), Kenya (4), Cameroon (4), Ghana (3), Uganda (2), Mozambique (2), and Sudan (2). One study each was conducted in Botswana, Gambia, Lesotho, Mauritius, Seychelles, Togo, and Zimbabwe. The remaining three articles were multi-country studies. Most (81.5%) of the included studies were cross-sectional surveys and the majority (79) focused on both male and female participants. The majority (80/81) of the included studies reported on the prevalence of childhood overweight/obesity, 8 on the trends of childhood overweight/obesity, and one presented evidence on the incidence of childhood overweight and obesity in SSA.

CONCLUSION

This review demonstrates limited studies on childhood overweight/obesity in most SSA countries although the included studies suggest an increasing burden. Considering the consequences of childhood obesity, there is a need for more primary researches to inform policies decision and implementation to halt the rise of childhood obesity/overweight in SSA.

Risk factors and morbidities associated with childhood obesity in sub-Saharan Africa: a systematic scoping review

BACKGROUND

The rising burden of childhood obesity is a major public health concern, particularly in sub-Saharan Africa (SSA), where most health systems are weak and least prepared for complications that may arise. While the need for preventive action is increasingly recognized, policy implementation within the sub-region has often been inadequate, non-systematic, and ad hoc. This study described evidence on the risk factors and morbidities associated with childhood obesity in SSA.

METHODS

Guided by the Arksey and O'Malley framework incorporating the Levac et al. recommendations, and the Joanna Briggs Institute guidelines, we conducted a scoping study to address the research question. Thorough keywords systematic search was conducted for potentially eligible articles in PubMed, Google Scholar, Web of Science, and CINAHL published between 2009 and June 2019. Articles obtained were screened independently by two investigators at the abstract and full text phases using the eligibility criteria. All relevant data were extracted by two investigators in parallel and thematic analysis conducted.

RESULTS

A total of 337,229 articles were obtained from the database search of which 68 satisfied the inclusion criteria and were included for data extraction. These 68 included studies were conducted in 19 countries with the majority, 27.9% (19/68) from South Africa followed by Nigeria with 20.6% (14/68). Six of the included studies were conducted in Ethiopia, 5 studies in Kenya, 4 studies each in Tanzania and Cameroon, and 2 studies each in Ghana, Uganda, and Sudan. Of the 68 included studies, one each was conducted in Botswana, Gambia, Lesotho, Mauritius, Mozambique, Seychelles, Togo, and Zimbabwe. Most (80.9%) of the included studies were cross-sectional, and only one was an intervention trial. Of the 68 included studies, 53 reported on risk factors, 12 reported on morbidities, and 3 reported both risk factors and morbidities. We found no evidence in almost 60% (28/47) of countries included in the World Health Organisation Africa region.

CONCLUSION

This review findings suggest a paucity of literature on the risk factors of childhood obesity and morbidities in most SSA countries. Hence, there is the need to intensify research efforts, especially experimental study designs using innovative strategies to promote healthy lifestyle choices that will prevent or minimize the risks and health consequences of childhood obesity in SSA.

Overweight/obesity and associated cardiovascular risk factors in sub-Saharan African children and adolescents: a scoping review

INTRODUCTION

Recently, childhood and adolescence overweight/obesity has increased disproportionately in developing countries, with estimates predicting a parallel increase in future cardiovascular disease (CVD) burden identifiable in childhood and adolescence. Identifying cardiovascular risk factors (CVRF) associated with childhood and adolescence overweight/obesity is pivotal in tailoring preventive interventions for CVD. Whilst this has been examined extensively in high-income countries, there is scant consistent or representative data from sub-Saharan Africa (SSA).

OBJECTIVE

This scoping review synthesises contemporary studies on CVRF associated with overweight and obesity in SSA children and adolescents to provide evidence on the current burden of overweight/obesity and CVD in this population.

METHODS

We searched MEDLINE and Google Scholar up to July 31, 2019 for observational and experimental studies and systematic reviews addressing childhood and adolescence overweight/obesity and CVRF in SSA without language restriction. Four investigators working in four pairs, independently selected and extracted the relevant data. The methodological quality of all included studies was assessed.

RESULTS

We included 88 studies with a total of 86,637children and adolescents from 20 SSA countries. The risk of bias was low in 62 (70.5%), moderate 18 (20.5%), and high in eight (9%) studies. Overweight/obesity in SSA children and adolescents is rising at an alarming rate. Its main associations include physical inactivity, unhealthy diets, high socio-economic status, gender and high maternal body mass index. Identified CVRF in overweight/obese SSA children and adolescents are mainly metabolic syndrome, hypertension, dyslipidaemia, diabetes and glucose intolerance. There is a dearth of guidelines or consensus on the management of either childhood overweight/obesity or CVRF in overweight/obese SSA children and adolescents.

CONCLUSION

The current findings suggest an urgent need to review current health policies in SSA countries. Health education and transforming the current obesogenic environment of the SSA child and adolescent into one which promotes physical activity and healthy dietary habits is required.

[Prevalence of overweight and obesity among adolescents in school in Lubumbashi, Democratic Republic of Congo]

INTRODUCTION

overweight and obesity in adolescents are a major global public health issue due to their potential impact on health and increasing frequency. This study aims to determine the prevalence of overweight and obesity among adolescents attending public and private schools in Lubumbashi (DRC).

METHODS

we conducted a cross-sectional study of 5341 adolescents aged 10-19 years, 2858 (53.5%) girls and 2483 (46.5%) boys. Weight and height were measured for each adolescent and then body mass index (BMI) was calculated.

RESULTS

the average weight was 43,78 ± 11.62 kg (42,39 ± 12.11 kg for boys and 44.95 ± 11.04 kg for girls), the average height was 151,30 ± 13,09 cm (151.20 ± 14.64 cm for boys and 151,38 ± 11.58 cm for girls) and BMI was 18,82 ± 3.15 kg/m² (19.39 ± 3.39 kg/m² for boys and 18.17 ± 2.71 kg/m² for girls). The prevalence of overweight was 8% while that of obesity was 1%. The girls were significantly more affected by overweight (10.7% girls against 5% boys) and obesity (1.5% girls against 0.4% boys) than the boys.

CONCLUSION

overweight and obesity in school environment are a reality in Lubumbashi. The prevalence of overweight and obesity in this age group category should be determined in a national evaluation plan in order to implement preventive and therapeutic strategies.

Elevated blood pressure among primary school children in Dar es salaam, Tanzania: prevalence and risk factors

Background

Whilst the burden of non-communicable diseases is increasing in developing countries, little data is available on blood pressure among Tanzanian children. This study aimed at determining the blood pressure profiles and risk factors associated with elevated blood pressure among primary school children in Dar es Salaam, Tanzania.

Methods

We conducted a cross sectional survey among 446 children aged 6–17 years from 9 randomly selected primary schools in Dar es Salaam. We measured blood pressure using a standardized digital blood pressure measuring machine (Omron Digital HEM-907, Tokyo, Japan). We used an average of the three blood pressure readings for analysis. Elevated blood pressure was defined as average systolic or diastolic blood pressure ≥ 90th percentile for age, gender and height.

Results

The proportion of children with elevated blood pressure was 15.2% (pre-hypertension 4.4% and hypertension 10.8%). No significant gender differences were observed in the prevalence of elevated BP. Increasing age and overweight/obese children were significantly associated with elevated BP (p = 0.0029 and p < 0.0001) respectively. Similar associations were observed for age and overweight/obesity with hypertension. (p = 0.0506 and p < 0.0001) respectively. In multivariate analysis, age above 10 years (adjusted RR = 3.63, 95% CI = 1.03–7.82) was significantly and independently associated with elevated BP in this population of school age children.

Conclusions

We observed a higher proportion of elevated BP in this population of school age children. Older age and overweight/obesity were associated with elevated BP. Assessment of BP and BMI should be incorporated in school health program in Tanzania to identify those at risk so that appropriate interventions can be instituted before development of associated complications.

In-school adolescents' weight status and blood pressure profile in South-western Nigeria: urban-rural comparison

BACKGROUND

Obesity is a risk factor for hypertension. The study observed the relationship between adolescent weight status and blood pressure (BP) and the determinants of the BP pattern in urban and rural areas.

METHODS

This was a cross-sectional study of 1000 randomly selected respondents (500 from urban and 500 from rural areas) who had anthropometry and BP measurements done. The pattern of BP measurements based on the weight status by location was observed. Statistical inferences were drawn via Chi-square and logistic regression.

RESULTS

The mean age for all the respondents was 13.73 years ±2.04 (13.63 ± 2.05 for urban and 13.82 ± 2.03 for rural). Systolic and diastolic BP generally increased with increasing respondents' age, with mean pressures higher in urban areas. About 3% were obese, while 7.7% were overweight. The overall prevalence of high BP was 4.1%, with two-thirds coming from urban areas. On logistic regression analysis, the significant variables associated with high BP include being female (AOR 2.067, 95%CI1.007-4.243, p = 0.048), overweight (AOR 5.574, 95%CI 2.501-12.421, p = 0.0001) and obese (AOR 12.437, 95%CI 4.636-33.364, p = 0.0001).

CONCLUSION

High BP was associated with being female, overweight and obesity in both urban and rural areas. Urgent measures are needed to address increasing prevalence of overweight and obesity among adolescents and consequent high blood pressure.

Prevalence of hypertension and prehypertension among children and adolescents in a semi-urban area of Uyo Metropolis, Nigeria

Introduction

In the past, Hypertension in childhood was not considered a problem but in the last few decades, it has gradually become a source of concern especially as children are known to maintain their blood pressures into adulthood. Therefore, hypertensive children are at risk of developing cardiovascular complications earlier in adulthood. In our own environment, the prevalence of hypertension in children is undocumented, hence the purpose of this study.

Methods

Two hundred children aged between 3-17 years were recruited into this study from two public schools-one primary, one secondary in a semi urban community in Uyo metropolis. The blood pressure of respondents was measured in accordance with the technique described by the 4^th Task Force on Blood Pressure Control in Children. The height and weight of all eligible subjects was measured using a stadiometer and a calibrated scale respectively. Body Mass Index (BMI) was assessed for each subject and World Health Organization (WHO) charts of BMI for age and sex were used as reference standards. Waist circumference was measured according to the technique described in the National Health and Nutrition Examination Survey.

Results

The prevalence of hypertension and prehypertension was found to be 3.5% and 2.5% respectively in this study. Only age (OR = 1.74, p = 0.005, 95%CI = 1.186-2.566), BMI (OR = 1.54, p = <0.001, 95% CI = 1.249-1.913) and waist circumference (OR = 1.16, p = 0.002, 95%CI = 1.056-1.271) were found to significantly predict the development of high blood pressure.

Conclusion

The prevalence of hypertension and prehypertension in this study was found to be low. Hypertension/prehypertension was more likely to develop with increasing age, BMI and waist circumference.

Effects of a multi-level intervention on the pattern of physical activity among in-school adolescents in Oyo state Nigeria: a cluster randomised trial

Background

Physical inactivity contributes to the global burden of non-communicable diseases. The pattern of physical activity in adulthood are often established during adolescence and sedentary behaviours in the early years could influence the development of diseases later in life. Studies on physical activity in Nigeria have focused largely on individual behaviours and the effects of school-based interventions have not been well investigated. The aim of the proposed study is to identify factors influencing; and evaluate the effects of a multi-level intervention on the physical activity behaviours of in-school adolescents in Oyo state, Nigeria.

Methods

The study will adopt a cluster randomised controlled trial design and schools will serve as the unit of randomisation. The sample size is 1000 in-school adolescents aged 10–19 years. The study will be guided by the socio-ecological model and theory of reasoned action and baseline data will be obtained through a mixed methods approach comprising a cross sectional survey to document the self-reported physical activity levels coupled with objectively measured physical activity levels using pedometers for a subset of the sample. Other measurements including weight, height, waist and hip circumferences, fitness level using the 20-m shuttle run test (20-mSRT) and blood pressure will be obtained. The schools’ built environment and policy support for physical activity will be assessed using structured questionnaires coupled with key informant interviews and focus group discussions with the school authorities. Baseline findings will guide the design and implementation of a 12-week multi-level intervention. The primary outcome measures are self–reported and 7-day objectively measured physical activity. Other secondary outcome measures are body-mass-index for age, waist-to-hip ratio, cardioresiratory fitness and blood pressure. The association between behavioural factors and physical activity levels will be assessed. Follow-up measurements will be taken immediately after the intervention and 3-months post intervention.

Discussion

Physical activity behaviours of adolescents in Nigeria are influenced by multiple factors. There is an urgent need for effective school-based interventions with a potential to improve the physical activity behaviours of adolescents in Nigeria and other low and middle income countries.

Trial registration

Pan African Clinical Trial Registry. Trial registration number: PACTR201706002224335, registered 26 June 2017.

Prevalence of elevated blood pressure in children and adolescents in Africa: a systematic review and meta-analysis

BACKGROUND

Despite substantial attention paid to the threat of elevated blood pressure in children and adolescents in high-income countries and the epidemic of hypertension in African adult populations, data on the burden of elevated blood pressure in African children and adolescents have not yet been synthesised. We did a systematic review and meta-analysis to provide estimates of the prevalence of elevated blood pressure and assess associated factors among children and adolescents in Africa.

METHODS

We searched Embase, PubMed, African Journals Online, and African Index Medicus to identify articles published from Jan 1, 1996, to Feb 2, 2017, and searched the reference list of retrieved articles. Each study was independently reviewed for methodological quality. We used a random-effects model to estimate the prevalence of elevated blood pressure across studies and heterogeneity (I²) was assessed via the χ² test on Cochran's Q statistic. This review is registered with PROSPERO, number CRD42015019029.

FINDINGS

We included 51 studies in qualitative synthesis and 25 in the meta-analysis reporting data of a pooled sample of 54 196 participants aged 2-19 years. Study quality was high with only four medium-quality studies and no low-quality studies. Prevalence of elevated blood pressure varied widely across studies (range 0·2-24·8%). The pooled prevalence of elevated blood pressure (systolic or diastolic blood pressure ≥95th percentile) was 5·5% (95% CI 4·2-6·9), whereas that of slightly elevated blood pressure (systolic or diastolic blood pressure ≥90th percentile and <95th percentile) was 12·7% (2·1-30·4). The prevalence of elevated blood pressure was largely associated with body-mass index (BMI), with a prevalence of elevated blood pressure six times higher in obese (30·8%, 95% CI 20·1-42·6) versus normal-weight children (5·5%, 3·1-8·4; p<0·0001).

INTERPRETATION

This study suggests a high prevalence of elevated blood pressure among children and adolescents in Africa, with overweight and obesity being an important risk factor. Efforts to address this burden of elevated blood pressure in children and adolescents should mainly focus on primary prevention at the community level, by promoting healthy lifestyles and avoiding other cardiovascular risk factors, especially overweight and obesity. This study also stresses the need for more elaborate studies using uniform and reliable diagnostic methods to reliably map the burden of elevated blood pressure in children and adolescents in Africa.

FUNDING

None.

Prevalence of Hypertension in Nigerian Children and Adolescents: A Systematic Review and Trend Analysis of Data from the Past Four Decades

Despite four decades of research, there is no systematic review and trend analysis on paediatric (pre)hypertension in Nigeria. This article reviewed data from cross-sectional studies on the subject. From the initial 9334 articles identified, 30 studies that met the inclusion criteria were systematically reviewed. Data from studies that defined hypertension as blood pressure (BP) greater than the 95th percentile for age, height and sex gave a prevalence of 8.2% [95% confidence interval (CI): 3.6-28.2%] for prehypertension and 5.1% (95% CI: 2.9-8.6%) for hypertension. For studies that defined hypertension as BP greater than 2 SD points from the mean of the population, the prevalence of hypertension was found to be 4.0% (95% CI: 2.8-5.7%). A significant negative trend (Z = -0.89; α < 0.01) with small magnitude (Q = -0.019; 95% CI: -0.070 to 0.028) was found for hypertension in the reviewed population. The prevalence of (pre)hypertension in Nigerian children and adolescents is moderate but has slightly declined over time.

Cardiometabolic profile of obese children in a sub-Saharan African setting: a cross-sectional study

BACKGROUND

Cardiovascular and metabolic consequences of obesity in children, unlike adults, are still not well understood nor have they been subject to extensive research in Africa. We aimed to identify the cardio-metabolic complications associated with childhood obesity at the early phase of the management of obese children in a reference center in Cameroon.

METHODS

In this cross-sectional study conducted from November 2013 to September 2014 and based on World Health Organization (WHO) classification of Obesity (BMI > 3SD under 5 years and BMI > 2SD from 5 and above), we included children aged 3 to 17 years who were being followed up for obesity at the pediatric endocrinology unit of the Mother and Child Center of the Chantal BIYA Foundation in Yaounde, Cameroon. A control group composed of children with normal BMI coming for a routine check up or vaccination was matched to the obese subjects. In both groups, we measured waist circumference (WC), blood pressure, fasting lipid profile and fasting glycaemia. We also considered the presence or absence of acanthosis nigricans. Data were analyzed using STATA software version 11.0, and presented as means, medians, compared with parametric and non-parametric statistical tests.

RESULTS

We enrolled 38 obese children and 38 controls matched for sex and age. The majority of our participants were boys with a sex ratio of 1.24, and median age was 9.9 years. The median Z score of BMI was 3.21 in obese children. Approximately (n = 35) 90% of obese children (<6% in controls p < 0.001) presented with an abdominal obesity (WC/height ratio > 0.5) and 58% (n = 22) had acanthosis nigricans (5% (n = 2) in controls, p < 0.001). Type 2 diabetes mellitus was found in one participant, hypercholesterolemia in about 16% (n = 6) and high blood pressure in 25% (n = 8) of participants. Metabolic syndrome was present in 19% (n = 4) of obese children aged >10 years.

CONCLUSIONS

Obesity in children is associated with early onset metabolic disorders such as dyslipidemia, high blood pressure and type 2 diabetes. The screening and management of these complications is therefore recommended.

Prevalence, risk factors and consequences of overweight and obesity among schoolchildren: a cross-sectional study in Kashmir, India

BACKGROUND

Obesity among children and adolescents is a growing public health problem. The objective of this study was to evaluate the prevalence, risk factors and metabolic consequences of obesity among schoolchildren from Kashmir, India.

METHODS

The study subjects (n=2024) included 870 boys and 1154 girls, aged between 6 and 18 years. Data were collected by interviewer-administered questionnaires. Information was obtained about different lifestyles, anthropometric parameters and dietary habits. Obesity was defined as body mass index (BMI) percentile as per the guidelines of Centers for Disease Control, 2000. For the evaluation of different clinical parameters, blood samples were collected from the subjects in the fasting state at 8 to 9 am after an overnight (10-12 h) fast.

RESULTS

The highest representation of subjects was from fee-paying private schools. Out of the total subjects, 6.69% were overweight and 4.64% were obese. The hip circumference, abdominal circumference, BMI, blood pressure (BP), use of ready-made foods as well as the clinical parameters like glucose, phosphorous, cholesterol and triglycerides were found significantly higher among girls than boys (p<0.05). Boys were taller and were physically more active than girls (p<0.01). Compared to the boys (3.33%), the girls were found to be more obese (5.63%). Rural dwelling subjects (4.22%) exhibited a lower percentage of obesity than urban population (5.00%). The difference in obesity among the different age groups was found statistically significant (p<0.05). Additionally, children with active lives in the form of vigorous (10.59%) or moderate (10.34%) exercise decreased their chances of gaining weight substantially.

CONCLUSIONS

Results from the present study have shown that prevalence of obesity among children was high in our population.

Physical activity, body mass index and blood pressure in primary school pupils attending private schools

BACKGROUND

Lack of physical activity contributes to overweight and obesity. It is recommended that children accumulate at least one hour of moderate to vigorous intensity physical activity daily.

OBJECTIVE

The level of physical activity, body mass index (BMI) and blood pressure (BP) were evaluated in pupils attending private primary schools.

METHOD

The intensity and duration of physical activity of the pupils selected by multiple stage sampling method were obtained with the aid of a questionnaire. The BMI and BP were measured. Analysis was by SPSS.

RESULTS

Of the 353 pupils, 132(37.4%) pupils were adequately physically active while overweight and obesity prevalences were 54(15.3%) and 65(18.4%) respectively. Hypertension prevalence in overweight/ obese children (6.5%) was significantly higher than in children with healthy weight 1.5%, P = 0.04.

CONCLUSION

Only a third of pupils met the recommended level of physical activity. The prevalence of overweight and obesity was high while the overweight and obese pupils were more likely to have hypertension compared to those with healthy weight. Physical activity programmes for primary school pupils in school and at home are therefore recommended.

Obesity and Hypertension among School-going Adolescents in Peru

BACKGROUND

Adolescent obesity and hypertension are global public health issues. The burden of adolescent obesity and hypertension in Peru is unclear. The aim of this study was to determine the prevalence of obesity and hypertension and their relationship among school-attending adolescents and to assess the need for health-promoting school programs in the study area.

METHODS

A cross-sectional school-based survey was conducted in a randomly selected sample of 952 secondary school adolescents from 11 schools in Lima or Callao, Peru, in 2014. Weight, height, and blood pressure (BP) were measured and categorized. Obesity was defined as ≥ 95(th) percentile in body mass index (BMI) for age and sex. Hypertension was defined as average systolic blood pressure and/or diastolic blood pressure ≥95(th) percentile in BP for sex, age, and height. Chi-square test and univariate logistic regressions were used at a 5% significance level to determine the relationship between BMI and BP category.

RESULTS

The mean age of subjects was 14.6 years; 46.4% were boys and 53.6% were girls. The prevalence of overweight and obesity was 20.2% and 9.5% overall, 17.4% and 11.1% for boys, and 22.5% and 8.0% for girls, respectively. The prevalence of hypertension was 26.7% overall, 34.8% for boys, and 19.6% for girls. In both sexes, BMI was strongly associated with BP (p < 0.01).

CONCLUSION

The prevalence of obesity and hypertension observed in the study area is relatively high. Overweight and obesity are strongly associated with BP status among adolescents. Health-promoting school programs may reduce the burdens of obesity and hypertension among school-going adolescents.

Fast foods and physical inactivity are risk factors for obesity and hypertension among adolescent school children in east district of Sikkim, India

Background:

Obesity and hypertension among school children have a huge impact on public health. Hence, we estimated the prevalence and sociodemographic correlates of childhood obesity and elevated blood pressure (BP) among adolescent schoolchildren (11-19 years) in urban areas of Gangtok, Sikkim, India.

Materials and Methods:

A population based cross-sectional study was conducted on 979 school children, during November 1, 2009 - April 30, 2010 in Gangtok, East Sikkim India. Anthropometric measurements and BP were recorded among the study population. Obesity and hypertension prevalent among adolescent school children and their correlates were analyzed.

Results and Conclusion:

Prevalence of obesity, overweight, and hypertension was 2.04%, 14.5% and 5.62%, respectively. The average fast food intake, screen time and limited outdoor activities were significantly associated with obesity. Increase in abdominal height positively correlated with increase in body mass index and body fat; however waist — hip ratio was not a reliable index. The burden of overweight/obesity as well as hypertension with all its associated risk was found to high among our study population, which necessitates framing of policies and actions at national level to address the risk associated with these noncommunicable diseases.

Gender comparisons of adolescents' anthropometry and blood pressure in Osun State, South-Western Nigeria

BACKGROUND

Adolescents are in their formative years, and they experience several changes including anthropometric changes. Significant weight gain occurs in adolescence, and increasingly, obesity and consequent increase in blood pressure (BP) are found in adolescents.

OBJECTIVE

This study compared anthropometric and BP measurements in male and female adolescents.

METHODS

A cross-sectional study of 1000 adolescents (510 males and 490 females) were selected by multi-stage sampling from eight secondary schools. Pertinent information was collected with the aid of a structured questionnaire, anthropometric and blood pressure measurements. Data were analyzed using SPSS 16.0 version, and the means of anthropometric indices and blood pressures in males and females were compared using independent t-test.

RESULTS

The mean age for male respondents was 13.83 years (SD 2.12) and for females 13.62 (SD 1.96). Generally, anthropometric indices gradually increased from the lower ages to the higher ages in both males and females. The mean height was the same for both males and females (1.54 m), while the mean weight, body mass index (BMI), and waist circumference were significantly higher in females than in males (p<0.05). A significantly higher proportion of females compared with males were overweight (10.2%, 5.3%) and obese (3.9%, 2.0%), respectively. The overall prevalence of "hypertension," was 4.1% and more females (70.7%) had "hypertension" than males (29.3%).

CONCLUSION

Females were heavier and constituted the greater proportion of those who had elevated BP. Adequate attention needs to be given to the challenging problems of overweight and obesity to forestall development of hypertension in adolescents, especially female adolescents.

Sleep characteristics, body mass index, and risk for hypertension in young adolescents

Inadequate sleep has been identified as a risk factor for a variety of health consequences. For example, short sleep durations and daytime sleepiness, an indicator of insufficient sleep and/or poor sleep quality, have been identified as risk factors for hypertension in the adult population. However, less evidence exists regarding whether these relationships hold within child and early adolescent samples and what factors mediate the relationship between sleep and risk for hypertension. Using data from the Study of Early Child Care and Youth Development, the present study examined body mass index (BMI) as a possible mediator for the effects of school-night sleep duration, weekend night sleep duration, and daytime sleepiness on risk for hypertension in a sample of sixth graders. The results demonstrated gender-specific patterns. Among boys, all three sleep characteristics predicted BMI and yielded significant indirect effects on risk for hypertension. Oppositely, only daytime sleepiness predicted BMI among girls and yielded a significant indirect effect on risk for hypertension. The findings provide clarification for the influence of sleep on the risk for hypertension during early adolescence and suggest a potential need for gender-specific designs in future research and application endeavors.

Association between body fat composition and blood pressure level among secondary school adolescents in Dar es Salaam, Tanzania

INTRODUCTION

Excess body fat and high blood pressure (BP) are important risk factors for increased cardiovascular morbidity and mortality, and both may have their roots of occurrence in childhood and adolescence. The present study aimed at determining the association between body fat composition and BP level among adolescents in Tanzania.

METHODS

A cross-sectional study involving 5 randomly selected secondary schools within Dar es Salaam was conducted between June and November 2013. Structured questionnaires were used to collect information on demographic characteristics and other cardiovascular risk factors. BP, height, weight and waist circumference were measured following standard methods. Body fat was assessed by skinfold thickness and categorized as underfat, healthy, overfat or obese according to World Health Organization definitions. Hypertension was defined as BP ≥ 90(th) percentile for age, height and gender of the adolescent.

RESULTS

The study included 582 adolescents (mean age 16.5 ± 1.8 years, 52.1% boys). The proportion of adolescents with overfat or obesity was 22.2%. Systolic, diastolic and combined hypertension was present in 17.5%, 5.5%, and 4.0% respectively. In the total population mean body fat percent correlated positively with diastolic BP and mean arterial pressure (MAP) but not with systolic BP. In multivariate analysis body mass index (β=0.21, p=0.008) and waist circumference (β=0.12, p=0.049), but not body fat percentage (β=-0.09, p=0.399) independently predicted higher MAP.

CONCLUSION

Body mass index predicts BP level better than body fat composition and should be used as a measure of increased risk for hypertension among adolescents.

Prehypertension and Hypertension among Schoolchildren in Brazzaville, Congo

Background. To determine the prevalence and associated factors of prehypertension (pre-HT) and hypertension (HT) in schoolchildren at Brazzaville (Congo). Methods. This cross-sectional study was conducted from March to May 2011 in five representative urban schools in Brazzaville. American Pediatric Society's definition of pre-HT and HT was used. The measurement of blood pressure was obtained using auscultator method. Univariable and multivariable analyses were performed to establish associations between blood pressure levels and sociobiographical factors. Results. 603 children were included. The mean age was 11.8 ± 3.6 years (range 5-18 years). The prevalence of pre-HT was 20.7% (n = 125). Factors associated with pre-HT were secondary school (P = 0.02), private schools (P < 0.004), migrants (P = 0.03), the obese (P = 0.004), high socioeconomic level (P < 0.01), and overweight (P = 0.02). In logistic regression, the independent determinants of pre-HT were secondary school (P = 0.0001), migration (P = 0.04), obesity (P = 0.004), and overweight (P = 0.01). The prevalence of HT was 10.1% (n = 61) during the first screening and 3.3% (n = 20) in second screening. The independent determinants of HT were obesity (P = 0.0001) and overweight (P = 0.0001). Conclusion. Pre-HT and HT are emerging as a mass problem in Congolese schoolchildren with urban migration and overweight/obesity to be controlled and prevented.

Perception of built environmental factors and physical activity among adolescents in Nigeria

BACKGROUND

Understanding environmental factors related to adolescents' physical activity can inform intervention for obesity control and prevention, but virtually no study has been conducted in the African region, where adolescents' physical inactivity and chronic diseases rates are rising. This study assessed associations between perceived built environmental variables and adolescents' physical activity (active transportation to school and leisure-time moderate-to- vigorous physical activity), and the moderating effects of neighborhood-level income on association between environmental variables and physical activity among Nigerian boys and girls.

METHODS

Participants were 1006 adolescents (12-19 years, 50.4% girls) randomly selected from 11 secondary schools in Maiduguri city, Nigeria. Physical activity and perceptions of environmental characteristics were assessed by validated self-report questionnaires. Separate gender-based, hierarchical multiple moderated linear regression analyses were used to examine the direct associations between the environmental perceptions and physical activity variables (active transportation and leisure-time MVPA; dependent variables), as well as the moderating effects of neighborhood-level income.

RESULTS

Only in boys were direct associations and interaction effect of neighborhood-level income found. Access to destinations was positively associated with active transportation to school (β = 0.18; CI = 0.67, 2.24); while residential density (β = 0.10; CI = 0.01, 1.74) and availability/quality of infrastructures (β = 0.14; CI = 0.49, 2.68) were positively associated with leisure-time MVPA. Also, neighborhood-level income moderated the association between perceived safety and leisure-time MVPA, with more perceived safety related to less MVPA (β = -0.16; CI = -0.01, -0.70) in boys living in high SES neighborhood but marginally related to more MVPA (β = 0.11; CI = -0.04, 2.88, p = 0.06) in boys living in low SES neighborhood.

CONCLUSIONS

Few environmental attributes were associated with adolescents' physical activity in Nigeria. Future studies are needed to determine the multidimensional correlates of physical activity that may be relevant for both adolescents' boys and girls in Nigeria.

The relationships of body mass index, waist-to-height ratio, and body fat percentage with blood pressure and its hemodynamic determinants in Korean adolescents: a school-based study

Purpose

Obesity is an important risk factor for hypertension in adolescents. We investigated the relationship of obesity-related indices (body mass index [BMI], waist-to-height ratio [WHR], and body fat percentage [%BF]) with blood pressure and the hemodynamic determinants of blood pressure in Korean adolescents.

Methods

In 2008, 565 adolescents, aged 12-16 years, were examined. The %BF of the participants was measured by bioelectrical impedance analysis. Echocardiography and brachial artery pulse tracing were used to estimate the stroke volume (SV), cardiac output (CO), total vascular resistance (TVR), and total arterial compliance (TAC).

Results

We noted that BMI, WHR, and %BF were positively correlated with systolic blood pressure (SBP) and diastolic blood pressure (DBP). The positive correlation between BMI and blood pressure (SBP and DBP) persisted after adjustment for WHR and %BF. However, after adjustment for BMI, the positive associations between blood pressure (SBP and DBP) and WHR as well as %BF, were not noted. With regard to the hemodynamic factors, BMI, but not WHR and %BF, was an independent positive factor correlated with SV and CO. TVR had an independent negative association with BMI; however, it was not associated with WHR or %BF. Moreover, we noted that BMI, WHR, and %BF did not affect TAC.

Conclusion

In Korean adolescents, BMI had an independent positive correlation with SBP and DBP, possibly because of its effects on SV, CO, and TVR. WHR and %BF are believed to indirectly affect SBP and DBP through changes in BMI.