Strengthening your legs isn’t just about sculpting muscles; it could be your secret weapon for sharper brain function and healthier aging. But here’s where it gets controversial—could focusing on leg power truly influence cognitive decline? Many experts believe so, and recent research provides some compelling clues. And this is the part most people miss: a simple leg workout might hold the key to preserving mental agility, especially as women approach and pass through menopause.
Historically, strength training was often associated with young men lifting heavy barbells or doing pull-ups. However, attitudes have shifted significantly over the years. Today, strength exercises are embraced broadly—particularly for women of all ages—due to their numerous benefits for bones, metabolic health, and more. Yet, among all these benefits, one area that warrants special attention, particularly for women in perimenopause or beyond, is the importance of leg day. A sturdy, powerful lower body could be vital not only for physical stability but also for maintaining brain health as we age. Louisa Nicola, a neurophysiologist working out of New York and specializing in Alzheimer’s research in women, emphasizes this point, as she explains in her insights to SELF.
Nicola highlights a fascinating study from 2015 involving over 300 female twins. This study unveiled a surprising link: women with stronger legs—a measure obtained by sitting on a specialized machine and pushing with maximum force and speed—tended to perform better on memory and processing speed tests a decade later. Interestingly, a subset of identical twins with notable differences in leg strength at the study’s start also underwent brain MRI scans 12 years later. The results? The twins with more powerful legs possessed higher amounts of grey matter and exhibited greater activation in critical brain areas during cognitive tasks. This suggests a more resilient, better-aging brain. The beauty of twin studies? Researchers could control for genetic factors and early-life influences, isolating leg strength as a significant factor.
And this isn’t an isolated finding. A 2018 study focusing on over 1,500 older adults discovered that those with stronger legs excelled in tests of executive function—skills like problem-solving and focused attention. Additional research links faster walking speeds, which depend heavily on leg strength, to better cognitive health. Conversely, slower gait or a decline in walking speed has been associated with cognitive decline and an increased risk of dementia.
So, why does having powerful legs contribute to a healthier brain? There are several interconnected explanations. First, improving leg strength recruits and builds up the fast-twitch muscle fibers—the ones responsible for explosive, quick movements. These fibers are crucial for activities like sprinting or jumping but also weaken faster with age. They rely on glucose for energy, breaking down into lactate—a chemical that can serve as an alternative energy source for the brain. As women transition into perimenopause, their brains become less efficient at producing energy, making this lactate supply all the more vital. Boosting leg power effectively creates a backup energy system, providing your brain with more fuel for thinking and memory.
Additionally, strengthening your legs involves repeated muscle contractions, which trigger the release of substances called myokines into your bloodstream. These chemicals travel to the brain, crossing the blood-brain barrier to influence cognition. One well-studied myokine is brain-derived neurotrophic factor (BDNF), renowned for its role in fostering the growth of new neurons in the hippocampus—the area central to memory. Increased levels of BDNF may help prevent age-related shrinking of this brain region, potentially reducing dementia risk.
Because leg muscles are the largest groups in the body, their strength can serve as a good indicator of overall muscular health and the benefits of comprehensive strength training. Such exercise boosts blood flow, delivering more oxygen and nutrients to the brain, while also reducing systemic inflammation—a factor linked to cognitive decline. Moreover, maintaining strong legs helps you stay active and less prone to falls, which are major risk factors for dementia. Given that women represent approximately two-thirds of Alzheimer’s disease cases, these connections emphasize a compelling reason for women to prioritize leg workouts.
So, how can you start harnessing these benefits and support your brain as you strengthen your legs? The foundational step is building strength, especially if you’re new to resistance training. Learn the correct techniques for squats and deadlifts, which target major lower body muscle groups, and incorporate a dedicated leg workout plan. Initially, bodyweight exercises are perfect for mastering form and technique. Once comfortable, incorporate weights—choosing a load that allows you to perform 8-12 repetitions—focusing on proper form and controlled movement.
From there, the next principle is progressive overload—gradually increasing the challenge by lifting heavier weights. The rule of thumb is to increase your weights by no more than 10% each week. When you do, you should feel more exerted at the bottom of each rep, nearing your maximum effort for eight repetitions—a level where you’re exhausted but could still squeeze out two more reps if needed. This is where muscle growth and strength gains occur.
Once you’ve developed a solid baseline strength, you can enhance your explosive power through plyometric exercises—think jump squats, tuck jumps, and jumping lunges. Start with one or two of these moves, performing low reps and sets, and gradually increase as they become easier. Over time, adding more intensity to these explosive movements can amplify both your physical strength and cognitive benefits.
So, what’s stopping you? Could a simple focus on leg strength be your most effective, yet often overlooked, strategy for safeguarding your mental health? Are you ready to challenge the conventions and see how powerful your legs—and your brain—can become? Share your thoughts and experiences in the comments—because in the battle for healthy aging, every step counts.
