Navigation Links
Gender differences in blood pressure appears as early as adolescence
Date:10/14/2011

Bethesda, Md. The female hormone estrogen is known to offer protection for the heart, but obesity may be taking away that edge in adolescent girls. New research from the University of California at Merced finds that although obesity does not help teens of either gender, it has a greater impact on girls' blood pressure than it does on boys'.

In a study of more than 1,700 adolescents between 13 and 17 years old, obese boys were 3.5 times more likely to develop elevated systolic blood pressure (SBP) than non-obese boys, but similarly obese girls were 9 times more likely to develop elevated systolic blood pressure than their non-obese peers. Systolic blood pressure, which is represented by the top number in a blood pressure reading, is the amount of force that blood exerts on blood vessel walls when the heart beats. High systolic measurements indicate risk for heart disease and stroke.

Rudy M. Ortiz, PhD, Associate Professor of Physiology and Nutrition and lead researcher in the study, will present his team's findings at the Physiology of Cardiovascular Disease: Gender Disparities conference, October 12 at the University of Mississippi in Jackson. The conference is sponsored by the American Physiological Society with additional support from the American Heart Association. His presentation is entitled, "Relationships Between Body Mass Category and Systolic Blood Pressure in Rural Adolescents."

The Study

Dr. Ortiz and his team obtained their data by direct measurements during the school district's health surveys and physicals to assess the teenagers' SBP against two health indicators: body mass index (BMI), which was categorized as normal weight, overweight, or obese, and blood pressure, which was categorized as normal, pre-elevated, or elevated.

The researchers found that the teenagers' mean BMI was significantly correlated with mean SPB for both sexes when both BMI and blood pressure assessments were used. They also found a significant correlation between BMI and SBP as a function of blood pressure, suggesting that the effect of body mass on SBP is much greater when it is assessed using blood pressure categories.

"We were able to categorize the students in different ways, first based on BMI within each of three blood pressure categories. Then we flipped that around and looked at each category of blood pressure for different weight categories. In each case, we are looking at SBP as the dependent variable," said Dr. Ortiz.

An odds ratio analysis revealed that obese boys were 2 and 3.5 times more likely to develop pre-elevated and elevated SBP, respectively, than boys who were normal weight. Obese girls were 4 and 9 times more likely to develop pre-elevated and elevated SBP, respectively, than girls who were normal weight.

Implications

According to Dr. Ortiz, the results do not bode well for obese teens later in life, especially for the girls. "Overall, there is a higher likelihood that those who present with both higher BMI and blood pressure will succumb to cardiovascular complications as adults. But the findings suggest that obese females may have a higher risk of developing these problems [than males]."

As for why obesity has a greater impact on SBP in girls than in boys, Dr. Ortiz has a hunch. "This may be where physical activity comes into play. We know, for example, that obese adolescent females participate in 50 to 60% less physical activity than boys in the population surveyed."


'/>"/>
Contact: Donna Krupa
dkrupa@the-aps.org
301-634-7209
American Physiological Society
Source:Eurekalert

Related biology news :

1. Gender biases in leadership selection during competitions within and between groups
2. Two from one: Pitt research maps out evolution of genders from hermaphroditic ancestors
3. Gene linked to lupus might explain gender difference in disease risk
4. Age, gender can affect risk to radiation treatment
5. Sex on the brain: Doublesex gene key to determining fruit fly gender
6. Gender-specific disease risks start in the womb
7. Gender-bending fish problem in Colorado creek mitigated by treatment plant upgrade
8. Research shows gender difference in energy compensation effect
9. Research proves gender-bending chemicals affect reproduction
10. Gender gap: Selection bias snubs scholarly achievements of female scientists
11. October 2011 conference focuses on the role of gender in cardiovascular disease
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:6/9/2016)... 2016 Paris Police Prefecture ... security solution to ensure the safety of people and operations ... the major tournament Teleste, an international technology group ... announced today that its video security solution will be utilised ... up public safety across the country. The system roll-out is ...
(Date:6/2/2016)... , June 2, 2016   The Weather Company , ... Watson Ads, an industry-first capability in which consumers will be ... able to ask questions via voice or text and receive ... Marketers have long sought an advertising ... that can be personal, relevant and valuable; and can scale ...
(Date:5/20/2016)... 20, 2016  VoiceIt is excited to announce ... By working together, VoiceIt and VoicePass ... and VoicePass take slightly different approaches to voice ... security and usability. ... new partnership. "This marketing and technology ...
Breaking Biology News(10 mins):
(Date:6/23/2016)... 2016   Boston Biomedical , an industry ... to target cancer stemness pathways, announced that its ... Drug Designation from the U.S. Food and Drug ... including gastroesophageal junction (GEJ) cancer. Napabucasin is an ... cancer stemness pathways by targeting STAT3, and is ...
(Date:6/23/2016)... SPRING, Md. , June 23, 2016 A ... collected from the crime scene to track the criminal down. ... and the U.S. Food and Drug Administration (FDA) uses DNA ... Sound far-fetched? It,s not. The ... genome sequencing to support investigations of foodborne illnesses. Put as ...
(Date:6/23/2016)... ... June 23, 2016 , ... Charm Sciences, ... microbial test has received AOAC Research Institute approval 061601. , “This is another ... year,” stated Bob Salter, Vice President of Regulatory and Industrial Affairs. “The Peel ...
(Date:6/23/2016)...  The Biodesign Challenge (BDC), a university competition that ... living systems and biotechnology, announced its winning teams at ... New York City . The teams, ... at MoMA,s Celeste Bartos Theater during the daylong summit. ... curator of architecture and design, and Suzanne Lee ...
Breaking Biology Technology: