7/5/2026
Yesterday I read an interesting paper: "Distinct Effects of Long-Term Resistance Exercise on Cognitive Deficits, Neurotrophins, and Amyloid Pathology in Male and Female APP/PS1 Mice."
What the researchers wanted to know
Most studies on exercise and brain health have focused on aerobic exercise—walking, jogging, cycling, and swimming.
This study asked a different question:
Can long-term resistance training (strength training) also help protect the brain against Alzheimer's disease?
The researchers were also interested in whether males and females respond differently.
What they did
The study used a well-established mouse model of Alzheimer's disease. These mice develop amyloid-beta (Aβ) plaques, memory problems, and cognitive decline similar to some features of human Alzheimer's disease.
Both male and female mice completed a four-month resistance training program. Their "weight lifting" consisted of climbing a ladder while carrying progressively heavier weights attached to their tails—a standard method for studying resistance exercise in mice.
The researchers then evaluated learning, memory, activity level, brain growth factors, and amyloid plaques.
What they found
The results differed between male and female mice.
Female mice showed:
Improved short-term memory
Reduced hyperactivity
Increased VEGF (vascular endothelial growth factor)
Reduced amyloid-beta levels
Reduced amyloid plaque burden
In other words, female mice showed less Alzheimer's pathology.
Male mice showed:
Improved learning and long-term memory
Increased BDNF (brain-derived neurotrophic factor)
Increased IGF-1
Reduced hyperactivity
Interestingly, although male mice showed clear cognitive improvement, their amyloid plaques did not decrease significantly.
Why these findings make sense
The results are biologically plausible.
For years, neuroscientists have known that exercise increases important growth factors such as BDNF, IGF-1, and VEGF. These molecules support neuron survival, promote new neural connections, improve blood supply, and enhance the brain's ability to learn and adapt.
Resistance exercise also reduces inflammation and improves insulin sensitivity—both of which are increasingly recognized as important factors in Alzheimer's disease.
Perhaps the most intriguing finding was that males and females appeared to benefit through different biological pathways. Female mice showed greater reductions in amyloid pathology, while male mice appeared to benefit primarily through increased neurotrophic support. This fits a growing body of evidence suggesting that Alzheimer's disease does not develop in exactly the same way in men and women, likely because of differences in hormones, metabolism, immune responses, and vascular biology.
If confirmed in humans, this could eventually lead to more personalized approaches to prevention and treatment.
An important limitation
This was a mouse study, not a human study.
Many Alzheimer's treatments that produced impressive results in mice have ultimately failed in clinical trials. Mouse brains are much simpler than human brains, so these findings should be viewed as promising rather than conclusive.
In addition, Alzheimer's disease involves far more than amyloid plaques. Modern research recognizes that tau protein, inflammation, vascular disease, metabolism, genetics, and other factors all interact in complex ways. Simply reducing amyloid has not consistently translated into meaningful cognitive improvement in humans.
My takeaway
Although this single study cannot tell us what resistance training does in people, it fits well with a much larger body of research.
Over the past two decades, regular exercise has consistently been associated with lower dementia risk, larger hippocampal volume, better executive function, healthier blood vessels, improved glucose regulation, and better overall brain health.
It also complements other research on healthy cognitive aging, including studies on music, lifelong learning, reading, social engagement, good sleep, hearing preservation, and blood pressure control.
Rather than looking for one "magic bullet" against dementia, the evidence increasingly points toward a lifestyle portfolio. Music, reading, writing, learning new skills, aerobic exercise, resistance training, and meaningful social interaction may each protect the brain through different mechanisms. Together, these healthy habits may have additive effects over a lifetime.
Finally, keep in mind that, a healthy brain is not built by any one single habit. It is cultivated over decades through physical, intellectual, and social engagement.
