University of Colorado, the transplant team in mouse muscle cells seen more than twice as large - or even live in the old method.
They said that the working conditions of science in medical reports, in the treatment of muscular dystrophy, muscle wasting, such as the terms of engagement.
A British expert said that there was a human treatment could be difficult.
Stem cells are the body can be in different types of tissue cells in a variety of different results.
Scientists believe they can help treat and help repopulate the tissue damaged by disease or injury associated with many problems.
common problem among the elderly is muscle weakness, muscle atrophy, clinging to the arm and legs.
This can result in quality of life for seniors in some cases, special attention and needs the support of the quick stop.
Causes the muscle cells are reduced in later life is not entirely clear, but theories of research in Colorado and test that helps muscle stem cells could slow or even reverse.
These young mice, "prejudice" in the legs, muscles, muscle stem cells produced and injected into other mice.
with the massive increase of 50% - not only healing fast, but damage of muscle mass by 170%, the average has increased.
Surprisingly, these results do not disappear in the coming months, researchers predict.
Because rats almost two years, the human equivalent of age, muscle mass remains the same.
Professor Bradley Olwin, who led the study, said: "This is a very exciting and unexpected.
"The signs we see only the aging muscle have been 't happen -. materials appear to stem cell self-renewal of high-speed operation, mainly produced in muscle cells allow"
In creating the "damage" to the body of the mouse seems to be important in the process - when the cells were injected into a muscle injury, no growth.
Professor Olwin said that although these experiments in mouse cells from other sources, may one day be able, a medicine may cause the patient a similar response to their own stem cells.
He said he was open, but also as muscular dystrophy, muscle atrophy in irreversible disease that began in the early treatment of the gate of life, not only the loss of muscle aging.
Dr. Hans Degens Manchester Metropolitan University Institute of Health and Human Movement, said the study appears to be "wonderful", but it is an obstacle that must be addressed before we can consider the number Renlei, including the need to take must control its inhibition of the immune system when transplanted from the donor cells.
He said: "The concern of humankind is one thing, the treatment must be simulated before the injury.
"In muscular atrophy, the muscles must decide what treatment works only on a single muscle.
"It should also be noted that the muscles of rats that the muscles of the body very small -. You can make multiple injections"
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