Source Paper
Attenuation of age-related changes in mouse neuromuscular synapses by caloric restriction and exercise
Gregorio Valdez, Juan C. Tapia, Hyuno Kang, Gregory D. Clemenson, F. H. Gage et al.
Proceedings of the National Academy of Sciences • 2010
Exercise Intervention Study
Objective: Evaluation of the effects of one month of wheel running exercise on age-related synaptic changes in 22-month-old mice, specifically examining structural alterations at the neuromuscular junction
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Protocol Steps
Exercise intervention initiation
Provide 22-month-old mice with access to running wheels for one month of exercise intervention
Note: Exercise intervention conducted in aged mice to assess effects on synaptic structure
View evidence from paper
“One month of exercise (wheel running) in 22-mo-old mice also reduced age-related synaptic changes”
Neuromuscular junction analysis
Examine skeletal neuromuscular junctions for age-related structural alterations including axonal swellings, sprouting, synaptic detachment, axonal withdrawal, and postsynaptic fragmentation
Note: NMJ is described as a large, accessible peripheral synapse suitable for studying synaptic changes
View evidence from paper
“Comparison of NMJs in young adult and aged mice revealed a variety of age-related structural alterations, including axonal swellings, sprouting, synaptic detachment, partial or complete withdrawal of axons from some postsynaptic sites, and fragmentation of the postsynaptic specialization”
Time-lapse imaging
Perform in vivo time-lapse imaging to visualize and document synaptic alterations and their reversal following exercise intervention
Note: Imaging reveals whether exercise can partially reverse synaptic changes that had already occurred
View evidence from paper
“Time-lapse imaging in vivo revealed that exercise partially reversed synaptic alterations that had already occurred”
Motor neuron assessment
Evaluate motor neuron number to determine if exercise affects motor neuron loss with age
Note: Exercise had no effect on motor neuron number, distinguishing synaptic effects from neuronal loss
View evidence from paper
“One month of exercise (wheel running) in 22-mo-old mice also reduced age-related synaptic changes but had no effect on motor neuron number or muscle fiber turnover”
Muscle fiber turnover analysis
Assess muscle fiber turnover rates to determine if exercise affects muscle fiber dynamics with age
Note: Exercise had no effect on muscle fiber turnover, indicating selective effects on synaptic structure
View evidence from paper
“One month of exercise (wheel running) in 22-mo-old mice also reduced age-related synaptic changes but had no effect on motor neuron number or muscle fiber turnover”