--- title: "Strength Training and Ageing: Body Has a Shutdown Switch " description: Most adults miss the two weekly strength sessions that protect muscle, brain volume and mood. Here is the mechanism, and how to switch it back on. author: Dr Marina Nani (Editor-in-Chief) date: 2026-06-05T12:00:00.000Z updated: 2026-07-10T10:06:14.757Z canonical: https://richdadmagazine.com/article/strength-training-and-ageing-body-has-a-shutdown-switch image: https://cdn.nanimediahouse.com/anastase-maragos-FP7cfYPPUKM-unsplash.jpg categories: Health & Strength content_type: Guide region: Global publication: Rich Dad Magazine schema_type: Article --- The phrase 'use it or lose it' sounds like a poster on a gym wall. Inside the body it is closer to a literal instruction. Muscle that is loaded regularly sends a constant stream of chemical signals telling the rest of the system to maintain itself. Muscle that is never loaded stops sending them. The repair crews stand down. This is the quiet beginning of what ageing actually feels like, and most adults are triggering it without knowing. The World Health Organization recommends muscle-strengthening activity on at least two days a week for every adult. Surveys across high-income countries find that the large majority do not manage it. Aerobic movement gets the attention, the step counts and the running apps, while the strength side goes ignored. The result is a population that walks enough and lifts almost nothing. ## Muscle is an organ that talks to the rest of the body For most of the last century, muscle was understood as a pulley system. It moved bones and it burned calories. That picture is now too small. Working muscle releases signalling molecules called myokines into the bloodstream every time it contracts under load. These molecules travel to the brain, the immune system, the bones and the fat tissue, and they carry instructions to grow, repair and stay active. When the load disappears, so does the signal. The body reads silence from the muscle as permission to economise. It sheds tissue it is not being asked to use, and it slows the maintenance work it would otherwise do by default. Researchers studying this loss have a name for it, sarcopenia, and it begins earlier than most people expect, often from the fourth decade onward in those who do nothing to resist it. ## The brain reads muscle as a status report The most striking recent work concerns the brain. A clinical trial led by researchers at the University of Sydney followed older adults at high risk of Alzheimer's disease, some doing supervised strength training and some not. Over eighteen months, hippocampal subregions in the group doing no strength training shrank by three to four percent, while those who trained showed only one to two percent reductions, and in some areas none at all. The hippocampus is the part of the brain most central to memory and most vulnerable to Alzheimer's. The lead investigator, Professor Michael Valenzuela, described the finding in unusually strong terms. He called it the first time any intervention, medical or lifestyle, had been able to slow and even halt degeneration in brain areas particularly vulnerable to Alzheimer's disease over such a long period. A separate twice-weekly resistance training study in Brazil, published in 2025, found a similar pattern. After six months, older volunteers with mild cognitive impairment who did strength training had better memory and thinking scores and less brain wasting than peers who did not. This is not the same as a guaranteed percentage cut in anyone's personal Alzheimer's risk, and it would be dishonest to dress it up as one. The trials are small and the people in them were already at high risk. What they show is a direction, consistent across studies, that strength training protects the exact brain regions that ageing erodes first. ## Grip strength turns out to be a window into the brain There is a simpler measurement that tells a related story. How hard you can squeeze your hand, your grip strength, tracks closely with the state of your brain. A study drawing on more than forty thousand participants in the UK Biobank found that greater grip strength was linked to better cognitive function, higher life satisfaction and reduced symptoms of depression and anxiety. Other cohort work has found that declining grip strength serves as a significant predictor of later cognitive decline. The relationship is not perfectly understood, and some studies find it runs in both directions, with brain changes affecting strength as much as the reverse. The point for a reader is practical. Grip is cheap to measure and possible to improve at any age, which makes it one of the few early warning lights on the dashboard that you can actually do something about. ## Movement and mood are connected at the chemical level Strength training also reaches the parts of the brain that govern mood. The evidence here is genuinely strong. A Cochrane review found that resistance exercise produced a large clinical effect on depression, larger than that seen with aerobic training alone. Reviews of high-intensity exercise have found the benefit most pronounced in people over sixty, the group that tends to do the least of it. The widely circulated claim that exercise cuts depression risk by sixty-six percent comes from a single analysis of children and adolescents, and the figure described aerobic exercise rather than strength work. The honest version is less tidy but still worth knowing. Lifting weights two or three times a week is one of the better-supported non-drug treatments for low mood that exists, and it works through the same myokine signalling that maintains the rest of the body. ## What switches back on The encouraging part is how little it takes to reverse the silence. The trials that produced these results did not ask for daily gym marathons. They used two supervised sessions a week, targeting the major muscle groups, at a load heavy enough to be genuinely hard by the final repetitions. That is the dose that restarts the signal. Inside the muscle cell, that load triggers the mitochondria, the structures that generate the body's energy, to multiply and work harder. Disused muscle has fewer and lazier mitochondria. Trained muscle builds more of them, which is the cellular reason strength work leaves people feeling more energetic rather than merely more tired. The fountains of energy metaphor is overstated, but the underlying biology is real. None of this requires expensive equipment or a particular age. The starting point is two sessions a week of resistance, whether from dumbbells, resistance bands, machines or body weight, applied consistently. The body has been waiting for the instruction. The only thing holding the shutdown switch down is the absence of load, and that is the one variable entirely within your control. ## Frequently asked questions **How many days a week should I do strength training?** The World Health Organization recommends muscle-strengthening activity on at least two days a week for adults of all ages, working all the major muscle groups. Two to three sessions covers most people. More than that offers diminishing returns for general health unless you are training for a specific sport. **Is strength training safe for older adults?** Yes. Supervised resistance training has been studied extensively in people in their seventies and eighties, including those with existing health conditions, and is considered safe when started at an appropriate load and progressed gradually. Anyone with a heart condition or a recent injury should clear it with a doctor first. **Does walking count as strength training?** No. Walking is aerobic exercise, which benefits the heart and lungs but does not load the muscles enough to maintain or build them. Strength training means working muscles against resistance heavy enough to fatigue them, which sends a different signal to the body than steady movement does. **Can strength training really affect brain health?** Clinical trials have found that resistance training is associated with less shrinkage in memory-related brain regions and better cognitive performance in older adults, particularly those at risk of dementia. The research is still developing, but the consistent direction across studies is that loading the muscles benefits the brain.