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Aging News & Information

Learning How Muscles Weaken With Age May Lead to Other Answers About Aging

Unexpected change of ‘set point’ in nervous system tied to loss of motor function; may explain other aging changes

Feb. 6, 2014 – The mystery of why our muscles just get weaker as we age seems to have an answer that involves the “set points” in our nervous system. For example, the set point for body temperature is 98.6 degrees. These points are not as set as we assumed. A new study finds they can be reset with age, and the researchers observed a set point that resulted in significantly diminished motor function in aging fruit flies.

Scientists from the School of Medicine at The University of Texas Health Science Center at San Antonio have found this clue as to why muscles weaken with age. In a study published today in The Journal of Neuroscience. They report the first evidence that “set points” in the nervous system are not inalterably determined during development but instead can be reset with age.


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“The body has a set point for temperature (98.6 degrees), a set point for salt level in the blood, and other homeostatic (steady-state) set points that are important for maintaining stable functions throughout life,” said study senior author Ben Eaton, Ph.D., assistant professor of physiology at the Health Science Center.

“Evidence also points to the existence of set points in the nervous system, but it has never been observed that they change, until now.”

Dr. Eaton and lead author Rebekah Mahoney, a graduate student, recorded changes in the neuromuscular junction synapses of aging fruit flies. These synapses are spaces where neurons exchange electrical signals to enable motor functions such as walking and smiling. “We observed a change in the synapse, indicating that the homeostatic mechanism had adjusted to maintain a new set point in the older animal,” Mahoney said.

The change was nearly 200 percent, and the researchers predicted that it would leave muscles more vulnerable to exhaustion.

Aside from impairing movement in aging animals, a new functional set point in neuromuscular junctions could put the synapse at risk for developing neurodegeneration — the hallmark of disorders such as Alzheimer’s and Parkinson’s diseases, Mahoney said.

“Observing a change in the set point in synapses alters our paradigms about how we think age affects the function of the nervous system,” she said.

It appears that a similar change could lead to effects on learning and memory in old age. An understanding of this phenomenon would be invaluable and could lead to development of novel therapies for those issues, as well.

Joel Rawson, Ph.D., of the University of Alaska at Anchorage, formerly a postdoctoral fellow in Dr. Eaton’s lab, is a study co-author.

The University of Texas Health Science Center at San Antonio, one of the country’s leading health sciences universities, ranks in the top 3 percent of all institutions worldwide receiving National Institutes of Health funding. The university’s schools of medicine, nursing, dentistry, health professions and graduate biomedical sciences have produced more than 29,000 graduates. The $765 million operating budget supports eight campuses in San Antonio, Laredo, Harlingen and Edinburg. For more information visit

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