Exercise is good for the aging brain. Indeed, the right kind of exercise can protect against neurodegeneration,the natural decline of brain functions that accompanies aging.
You could encourage your older clients to play “brain games” on computers or mobile apps. Alas, multiple studies say this approach helps only with the specific cognitive functions the games use (Bamidis et al. 2014). Hence, a computer game that requires a lot of visuospatial processing tends to improve visuospatial processing—but not much else.
Fortunately, scientists have found a productive alternative in effortful learning (see “Effortful Learning in Action,” below), which combines mental exercises with physical movement. Effortful exercises include learning to speak a new language, playing a musical instrument, performing dance steps or tai chi, or even figuring out how to juggle.
These tasks challenge and stimulate different areas of the brain. There is evidence that some types of effort can increase the amount of white and gray matter in the brain (Zivari Adab et al. 2018).
The key to effortful learning seems to be that the tasks are novel and challenging (Bamidis et al. 2015). Apparently, learning a new skill can release beneficial neurotransmitters such as dopamine and acetylcholine, which may accelerate neuroplasticity, the brain’s ability to adapt to new challenges.
We already know that physical exercise—especially aerobic and progressive resistance training—does great things for the health and function of the brain. Exercise increases cerebral blood flow, delivering nutrients and removing waste products. Exercise also boosts brain-derived neurotrophic factor (BDNF) and insulin-like growth factor-1 (IGF-1), two proteins that promote brain health (Churchill et al. 2002). Essentially, everything that keeps the heart healthy—diet, exercise and so on—also improves the well-being of the brain (Kramer & Colcombe 2018).
Why Simultaneous Cognitive and Physical Training Works
Emerging research explores the benefits of combining physical and cognitive exercises to shape the body and sharpen the mind. Preliminary studies suggest that this type of dual tasking may be more beneficial than the sum of the activities’ separate gains. What’s more, the combined effects can have a profound impact on both ameliorating and preventing cognitive decline in older people (Shatil 2013). More research must be done to confirm some of these theories, but pilot studies on dual tasking are encouraging (McEwen et al. 2018).
Dual tasking has many real-world applications, such as talking while walking or driving while responding to multiple stimuli. The ability to dual-task deteriorates with age, reducing reaction times and walking speeds, causing more frequent run-ins with obstacles and increasing the risk of falls (Pichierri et al. 2011).
One promising dual-tasking strategy combines aerobic exercise with cognitive challenges to encourage cerebral blood flow and cell growth (Mozolic, Hayasaka & Laurienti 2010). The key challenge here is that these factors are interdependent: They must work in concert to achieve significant results.
Blood flow. The importance of healthy blood flow to the brain cannot be overstated. Aerobic exercise bathes the vital tissues of the brain with oxygen, glucose and other nutrients. Combining aerobic exercise and cognitive challenges increases the rate at which the brain receives these necessary ingredients.
Nerve birth. Combining cognitive and aerobic efforts encourages the growth of new neurons and synapses in the brain. But it’s not enough to make new cells; the cells must incorporate themselves into brain tissue to survive (Shors et al. 2014). Thus, many people call nerve birth a “use-it-or-lose-it” scenario.
Specific activities can generate new nerve cells, but the movements must continually recruit the nerves, or they will die in short order.
Luckily, physical exercise and cognitive challenges seem to be a perfect combination: Aerobic activity increases the proliferation of nerve cells (van Praag, Kempermann & Gage 1999), and effortful learning helps integrate them into the neural network (Shors et al. 2014). Preliminary studies on animals and humans support the hypothesis that combined physical and cognitive training is more effective at recruiting and maintaining new neurons than either intervention alone. In one study that combined aerobic exercise with an “enhanced environment” (similar to a human cognitive challenge, but for rodents), the increase in new neurons was as much as 30% greater than it was with the singular interventions (Fabel et al. 2009).
Exercise and cognitive challenges also aid in the birth of new synapses—spaces that exist between neurons, linking their activities together. The birth of new synapses—synaptogenesis—is rampant during early brain development, but the process slows later in life. Robust increases in the birth of neurons and synapses can increase brain volume, specifically in the gray matter of the cortex and cerebellum. Combining aerobic exercise and cognitive challenges therefore expands brain volume by encouraging cell birth (Colcombe et al. 2004).
Physical Tasks That Target Specific Cognitive Functions
Physical movement helps the brain perpetually rewire itself. Thus, physical and cognitive challenges remain central to the health and function of the brain. We can say with confidence that we can shape our brain, much as we do the rest of our body, through combined physical and cognitive training.
The goal, therefore, is to challenge each person’s specific cognitive deficiencies. To stay generally healthy and in good shape, we all need a program of aerobic, strength and flexibility exercises. But becoming much more muscular, getting really lean or running faster requires a more specific physical challenge that aligns with clear goals. That’s the principle of specificity.
The brain is no different. How you challenge it determines which cognitive functions improve. As mentioned earlier, the tricky part is that cognitive training through, say, a brain game app makes you better at playing the game but doesn’t improve overall brain functions. Exercise, by contrast, affects multiple domains of cognitive ability—especially when we do effortful activities that challenge the brain and the body simultaneously.
Combined physical and cognitive training shows great promise as a tool for maximizing brain health and function. Indeed, it may be the next big innovation in the fitness industry as the world’s population continues to age and rates of dementia keep rising.
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Bamidis, P.D., et al. 2015. Gains in cognition through combined cognitive and physical training: The role of training dosage and severity of neurocognitive disorder. Frontiers in Aging Neuroscience, 7 (152), 1–15.
Churchill, J.D., et al. 2002. Exercise, experience and the aging brain. Neurobiology of Aging, 23 (5), 941–55.
Colcombe, S.J., et al. 2004. Cardiovascular fitness, cortical plasticity, and aging. Proceedings of the National Academy of Sciences, 101 (9), 3316–21.
Fabel, K., et al. 2009. Additive effects of physical exercise and environmental enrichment on adult hippocampal neurogenesis in mice. Frontiers in Neuroscience, 3 (50).
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van Praag, H., Kempermann, G., & Gage, F.H. 1999. Running increases cell proliferation and neurogenesis in the adult mouse dentate gyrus. Nature Neuroscience, 2 (3), 266–70.
Zivari Adab, H., et al. 2018. White matter microstructural organisation of interhemispheric pathways predicts different stages of bimanual coordination learning in young and older adults. European Journal of Neuroscience, 47 (5), 446–59.