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Study Shows Nutritional Supplements May Combat Muscle Loss [Fibromyalgia News]

  [ 80 votes ]   [ Discuss This Article ]
www.ProHealth.com • September 16, 2002


HOUSTON - (Aug. 27, 2002) - Early indications show that nutritional supplements may lessen muscle atrophy brought on by space travel, prolonged bed confinement or immobility.

Through an NSBRI bed-rest study, an amino acid and carbohydrate supplement is being studied to determine its value as a nutritional countermeasure to muscle loss. To study space travel's effect on muscles, Dr. Robert Wolfe of the University of Texas Medical Branch at Galveston enlisted healthy subjects to stay in bed 28 days during a National Space Biomedical Research Institute study.

"One cause of muscle atrophy in space is lack of muscular activity. That's why bed rest is a good model because it minimizes activity, and like astronauts, you lose muscle mass primarily in the legs," said co-investigator Dr. Arny Ferrando, a professor of surgery at UTMB and Shriners Hospital for Children in Galveston. "When muscles are inactive, as they are in space, they don't make new proteins. If muscle breakdown rates are the same, that means you lose muscle."

Researchers are attempting to increase protein synthesis rates with supplements of amino acids, which are the raw materials of protein. Participants received the supplements three times a day, and researchers compared the protein synthesis/breakdown rates and muscle mass before and after the bed-rest study. This data was compared to results from a control group that received a placebo drink instead of the supplements.

"Early results suggest that the amino acid supplement is able to maintain synthesis rates and body mass," Ferrando said.

During the study, subjects must remain in bed and can get up only briefly to use a bedside commode. They eat and bathe from their beds, and daily activities encompass watching television, reading books and using a bedside computer.

Midway through the study, researchers determine muscle mass and function by testing the subjects' strength and body composition.

They gather the most vital data, the protein synthesis and breakdown rates, by using stable isotope analysis. With the stable isotope technique, researchers attach a harmless tracer to specific amino acids that travel through the bloodstream. Then, they take blood samples to determine the amount of amino acids that enter and exit the leg.

"If 80 amino acids are coming into the artery and 60 are going out of the vein, we know that 20 were probably made into proteins in the muscle," said Dr. Douglas Paddon-Jones, also of UTMB and a co-investigator performing these studies. "We complete the muscle analysis by removing a small piece of muscle and determining how many amino acids have been incorporated into proteins. Over time, we can calculate the rate at which the synthesis and breakdown occurs."

Space conditions also elevate the body's level of the stress hormone cortisol, which increases the breakdown rate of proteins. "Under stress, the body breaks down proteins to make energy for survival," said Ferrando, a member of NSBRI's nutrition and fitness research team. "However, this process also causes muscle atrophy."

To study the supplement's effects on muscle loss due to elevated levels of cortisol, researchers infused the stress hormone into the participants' blood during the stable isotope tests. The researchers mimic the cortisol concentrations found during space flight, then determine protein synthesis and breakdown rates of the subjects taking the supplement and compare this to the rates of the control group.

Ferrando and Wolfe are also collaborating with other NSBRI researchers who use the subjects' body fluids to study changes in bone, immune function and cell damage induced by bed rest.

Findings from this research on nutritional supplements could benefit patients on Earth.

"Muscle atrophy is common in many populations: the elderly, kids with burns, patients in intensive care or people who have had major operations. We're looking at this phenomenon in terms of space flight, but the study has many other implications," Ferrando said.

The NSBRI's consortium members include Baylor College of Medicine, Brookhaven National Laboratory, Harvard Medical School, The Johns Hopkins University, Massachusetts Institute of Technology, Morehouse School of Medicine, Mount Sinai School of Medicine, Rice University, Texas A&M University, University of Arkansas for Medical Sciences, University of Pennsylvania Health System and University of Washington.



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