Beef Up: Middle-aged men may need more to maintain muscle mass

Beef lovers rejoice: 6 ounces of beef is good for muscles

2013-02-04

(Press-News.org) Ottawa, ON (February 4, 2013) – People tend to lose muscle mass as they age; researchers are investigating ways to delay or counteract age-related muscle loss. A study conducted by the Exercise Metabolism Research Group at McMaster University suggests that current guidelines for meat consumption are based on the protein needed to prevent deficiency without consideration for preservation of muscle mass, particularly for older individuals who are looking to maintain their muscle as they age. This research was published in the journal Applied Physiology, Nutrition, and Metabolism.

Thirty-five middle-aged men (~59 years old) participated in a study that found that eating a 6-ounce serving of 85% lean ground beef resulted in significant improvements in the rate of muscle protein synthesis following exercise. The investigators measured muscle protein synthesis (MPS), which is essential to the body's ongoing growth, repair and maintenance of skeletal muscle in men who did and did not lift weights. What researchers determined was that the quantity of beef needed for optimal MPS for this age group is double the current recommended serving size of meat.

"Canada's Food Guide now suggests that consuming about 3oz (0.80 g/kg/d) of meat per serving is adequate to provide protein at the recommended level," says Dr. Stuart Phillips, the study's senior author and a researcher with the Exercise Metabolism Research Group at McMaster University. "However, our work shows that the quantity of beef needed to maximize the renewal of new muscle proteins was at least 6oz in middle-aged men. Our findings have clear ramifications for the current recommendations regarding protein to prevent muscle loss in aging."

### The article "Dose-dependent responses of myofibrillar protein synthesis with beef ingestion are enhanced with resistance exercise in middle-aged men" is available Open Access in the journal Applied Physiology, Nutrition, and Metabolism, DOI: 10.1139/apnm-2012-0092

http://www.nrcresearchpress.com/doi/abs/10.1139/apnm-2012-0092#.UP6sVWe2b4z

ELSE PRESS RELEASES FROM THIS DATE:

President Obama awards nation's top scientists and innovators highest honor

2013-02-04

President Obama today awarded 12 eminent researchers the National Medal of Science and 11 extraordinary inventors the National Medal of Technology and Innovation, the highest honors bestowed by the U.S. government upon scientists, engineers and inventors. The recipients received their awards at a White House ceremony. This marks the 50th anniversary of the presentation of the first National Medals of Science in 1963 by President John F. Kennedy. "I am proud to honor these inspiring American innovators," Obama said when the awardees were announced. "They represent the ...

Amyloid imaging shows promise for detecting cardiac amyloidosis

2013-02-04

Reston, Va. – While amyloid imaging may now be most associated with detecting plaques in the brain, it has the potential to change the way cardiac amyloidosis is diagnosed. According to first-of-its-kind research published in the February issue of The Journal of Nuclear Medicine, positron emission tomography (PET) with 11C-PIB can positively visualize amyloid deposits in the heart. Currently there is no noninvasive test available for specific diagnosis. Cardiac amyloidosis is a deadly disorder caused by abnormal amyloid deposits in the heart tissue. Early diagnosis before ...

USDA scientists say mix-and-match cover cropping can optimize organic production

2013-02-04

This press release is available in Spanish. Farmers can fine-tune their use of cover crops to help manage costs and maximize benefits in commercial organic production systems, according to U.S. Department of Agriculture (USDA) scientists. Production expenses for high-value organic crops like lettuce and broccoli can exceed $7,000 per acre, so producers often try to streamline costs with an annual two- to three-crop rotation. Agricultural Research Service (ARS) horticulturalist Eric Brennan designed a long-term investigation that examined several different cover ...

Little House books' Mary Ingalls probably did not go blind from scarlet fever, U-M study says

2013-02-04

Ann Arbor, Mich. — In the beloved American stories of the Little House on the Prairie, author Laura Ingalls Wilder writes emotionally about how scarlet fever robs her big sister Mary of her sight. But in a new study published today in the journal Pediatrics, University of Michigan researchers found it is likely scarlet fever had nothing to do with Mary's blindness. Senior author Beth A. Tarini, M.D., and her co-authors used evidence from newspaper reports, Laura Ingalls' memories and school registries to conclude Mary's blindness was probably caused by viral meningoencephalitis. "Since ...

Can cancer be turned against itself?

2013-02-04

Though a small group of proteins, the family called Ras controls a large number of cellular functions, including cell growth, differentiation, and survival. And because the protein has a hand in cellular division, mutated Ras, which can be detected in one-third of all tumors, contributes to many human cancers by allowing for the rapid growth of diseased cells. Now Prof. Yoel Kloog of Tel Aviv University's Department of Neurobiology, along with Dr. Itamar Goldstein of TAU's Sackler Faculty of Medicine and the Sheba Medical Center and their students Helly Vernitsky and ...

Study finds incentive price for reducing HIV risk in Mexico

2013-02-04

PROVIDENCE, R.I. [Brown University] — Studies have found that conditional cash transfer programs, in which governments pay citizens if they consistently practice societally beneficial behaviors, have improved pediatric health care and education in Mexico, increased HIV testing in Malawi, and reduced sexually transmitted infections in Tanzania. Public health researchers therefore investigated whether the idea could be applied to HIV risk behaviors among gay men and male sex workers in Mexico City. A new study reports not only that some members of those populations would ...

New kind of extinct flying reptile discovered by scientists

2013-02-04

A new kind of pterosaur, a flying reptile from the time of the dinosaurs, has been identified by scientists from the Transylvanian Museum Society in Romania, the University of Southampton in the UK and the Museau Nacional in Rio de Janiero, Brazil. The fossilised bones come from the Late Cretaceous rocks of Sebeş-Glod in the Transylvanian Basin, Romania, which are approximately 68 million years old. The Transylvanian Basin is world-famous for its many Late Cretaceous fossils, including dinosaurs of many kinds, as well as fossilised mammals, turtles, lizards and ancient ...

In combat vets and others, high rate of vision problems after traumatic brain injury

2013-02-04

Philadelphia, Pa. (February 4, 2013) - Visual symptoms and abnormalities occur at high rates in people with traumatic brain injury (TBI)—including Iraq and Afghanistan War veterans with blast-related TBI, reports a study, "Abnormal Fixation in Individuals with AMD when Viewing an Image of a Face", in the February issue of Optometry and Vision Science, official journal of the American Academy of Optometry. The journal is published by Lippincott Williams & Wilkins, a part of Wolters Kluwer Health. Vision problems are similar for military and civilian patients with TBI, ...

Study shows Facebook unfriending has real life consequences

2013-02-04

DENVER (Feb. 4, 2013) – Unfriending someone on Facebook may be as easy as clicking a button, but a new study from the University of Colorado Denver shows the repercussions often reach far beyond cyberspace. "People think social networks are just for fun," said study author Christopher Sibona, a doctoral student in the Computer Science and Information Systems program at the University of Colorado Denver Business School. "But in fact what you do on those sites can have real world consequences." Sibona found that 40 percent of people surveyed said they would avoid in real ...

In a fight to the finish, Saint Louis University research aims knockout punch at hepatitis B

2013-02-04

ST. LOUIS – In research published in the Jan. 24 edition of PLOS Pathogens, Saint Louis University investigators together with collaborators from the University of Missouri and the University of Pittsburgh report a breakthrough in the pursuit of new hepatitis B drugs that could help cure the virus. Researchers were able to measure and then block a previously unstudied enzyme to stop the virus from replicating, taking advantage of known similarities with another major pathogen, HIV. John Tavis, Ph.D., study author and professor of molecular microbiology and immunology ...

Beef Up: Middle-aged men may need more to maintain muscle mass

ELSE PRESS RELEASES FROM THIS DATE:

LAST 30 PRESS RELEASES: