Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Less inflammation, better heart health in physically fit females

25.06.2002


Physical fitness may have an anti-inflammatory effect that protects against heart attacks, according to a report in today’s rapid access issue of Circulation: Journal of the American Heart Association.



In a recent study, researchers compared the level of physical fitness in 135 women from three ethnic groups to their levels of C-reactive protein (CRP). CRP level indicates inflammation.

Elevated CRP is associated with a two- to five-fold increase in the risk of heart attack. The researchers found lower levels of CRP among the most fit Caucasian and Native-American women compared with their less-fit peers. African-American women, however, failed to show the same strong correlation.


People with elevated CRP levels should begin regular exercise with guidance from their physician, says Michael J. LaMonte, Ph.D., an author of the report and director of exercise testing and research at The Fitness Institute, division of cardiology, LDS Hospital in Salt Lake City, Utah.

"Our data really support the current public health recommendation that a physically active and fit lifestyle is conducive to overall good health, and in particular to cardiovascular health," he says. "We are not talking about a marathon runner’s level of fitness. We are talking about being active on a regular basis, and a good benchmark is to be able to walk a mile and a half in about 30 or 35 minutes."

LaMonte and his colleagues hypothesized that physical fitness might protect against high levels of CRP. They analyzed data from a subset of 44 African-American, 45 Native-American, and 46 Caucasian women who were part of the Cross-Cultural Activity Participation Study (CAPS) in the mid-1990s.

In CAPS, physical fitness was determined by testing women on a treadmill while speed and angle of elevation were increased every two minutes. The women continued on the treadmill until they reached their point of exhaustion. Each woman’s treadmill time was adjusted for her age because fitness declines as the body ages, says LaMonte. Women in each of the three ethnic groups were divided into three levels of fitness – low, moderate and high – on the basis of their treadmill tests.

Previous studies of CRP and fitness had simply asked participants to estimate the amount they exercised. "The treadmill is much more accurate than self-reporting in determining fitness," says LaMonte, an assistant professor of medicine at the University of Utah.

LaMonte and his colleagues used a highly sensitive immunoassay test to determine the CRP level in frozen blood samples that were drawn from the 135 women during CAPS. The blood was taken after a 12-hour fast and 24-hour abstinence from exercise and smoking but before their treadmill tests.

The researchers assessed CRP levels by race, fitness, obesity and waist size. They found that:

  • CRP levels were 0.43 milligrams per deciliter (mg/dL) in African-American women, 0.25 mg/dL in Native American and 0.23 mg/dL in Caucasian women.
  • Women with low fitness had significantly higher CRP levels (0.43 mg/dL) than those in the moderate (0.26 mg/dL) and high (0.23 mg/dL) fitness categories.
  • CRP was also significantly elevated in women with the highest body mass index (BMI). Body mass index assesses body weight relative to height. It is an indirect measure of body composition that correlates with body fat in most people. People with BMI values from 18.5 to 24.9 are healthy; from 25.0 to less than 30.0 are overweight; and 30.0 or greater are considered obese. Average CRP in women with a healthy BMI was 0.19 mg/dL, in overweight women 0.34 mg/dL and in obese women 0.42 mg/dL.
  • Women whose waists measured more than 35 inches had CRP concentrations of 0.42 mg/dL, while those with lesser girth had average CRP levels of 0.25 mg/dL.

The researchers emphasize that because of the small number of women in their study, the results – however intriguing they might be – must be considered preliminary.

"The real test of their validity is for someone to do a large, long-term study that looks at the effect of changing people’s activity levels on their C-reactive protein, and also to see if the overall risk of cardiovascular disease changes," LaMonte says.


CAPS was funded by the National Institutes of Health and the Centers for Disease Control and Prevention as part of the Women’s Health Initiative Community Trials. It was led by Barbara E. Ainsworth, Ph.D., senior author of the report.

Co-authors are J. Larry Durstine, Ph.D.; Frank G. Yanowitz, M.D.; Tobin Lim, B. S.; Katrina D. DuBose, M.S.; and Paul Davis, Ph.D.
CONTACT: For journal copies only,
please call: (214) 706-1396
For other information, call:
Maggie Francis: (214) 706-1397
Darcy Spitz: (212) 878-5940


Maggie Francis | EurekAlert!

More articles from Health and Medicine:

nachricht Satellites, airport visibility readings shed light on troops' exposure to air pollution
09.12.2016 | Veterans Affairs Research Communications

nachricht Oxygen can wake up dormant bacteria for antibiotic attacks
08.12.2016 | Penn State

All articles from Health and Medicine >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Electron highway inside crystal

Physicists of the University of Würzburg have made an astonishing discovery in a specific type of topological insulators. The effect is due to the structure of the materials used. The researchers have now published their work in the journal Science.

Topological insulators are currently the hot topic in physics according to the newspaper Neue Zürcher Zeitung. Only a few weeks ago, their importance was...

Im Focus: Significantly more productivity in USP lasers

In recent years, lasers with ultrashort pulses (USP) down to the femtosecond range have become established on an industrial scale. They could advance some applications with the much-lauded “cold ablation” – if that meant they would then achieve more throughput. A new generation of process engineering that will address this issue in particular will be discussed at the “4th UKP Workshop – Ultrafast Laser Technology” in April 2017.

Even back in the 1990s, scientists were comparing materials processing with nanosecond, picosecond and femtosesecond pulses. The result was surprising:...

Im Focus: Shape matters when light meets atom

Mapping the interaction of a single atom with a single photon may inform design of quantum devices

Have you ever wondered how you see the world? Vision is about photons of light, which are packets of energy, interacting with the atoms or molecules in what...

Im Focus: Novel silicon etching technique crafts 3-D gradient refractive index micro-optics

A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.

Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...

Im Focus: Quantum Particles Form Droplets

In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.

“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

ICTM Conference 2017: Production technology for turbomachine manufacturing of the future

16.11.2016 | Event News

Innovation Day Laser Technology – Laser Additive Manufacturing

01.11.2016 | Event News

#IC2S2: When Social Science meets Computer Science - GESIS will host the IC2S2 conference 2017

14.10.2016 | Event News

 
Latest News

Researchers identify potentially druggable mutant p53 proteins that promote cancer growth

09.12.2016 | Life Sciences

Scientists produce a new roadmap for guiding development & conservation in the Amazon

09.12.2016 | Ecology, The Environment and Conservation

Satellites, airport visibility readings shed light on troops' exposure to air pollution

09.12.2016 | Health and Medicine

VideoLinks
B2B-VideoLinks
More VideoLinks >>>