The short version
- In 3,075 adults aged 70 to 79, the lowest quartile of CT-measured thigh muscle area carried a 1.90 hazard ratio in men and 1.68 in women for developing difficulty walking a quarter mile or climbing ten steps.
- In 2,292 adults from the same cohort, quadriceps strength predicted mortality strongly while muscle size measured by CT or DXA did not, indicating muscle quality matters more than quantity for risk.
- In 100 frail nursing home residents of mean age 87, ten weeks of progressive resistance training raised strength by 113% against 3% in non-exercisers, while the multinutrient supplement had no effect on any primary outcome.
- Pooling 22 trials in 721 older adults doing resistance training, creatine added 1.37kg of lean tissue mass over placebo, and one later meta-analysis found no strength advantage once loading-phase trials were excluded.
- Sudden or unexplained muscle loss warrants blood work for thyroid, glucose, kidney and inflammatory causes before any supplement is considered.
There is a moment, somewhere in most people's seventies or eighties, when the question stops being how you look in a shirt and becomes whether you can get out of a low chair without using your hands. Everything worth saying about muscle and long life is downstream of that moment.
What the mass number actually predicts
The Health, Aging and Body Composition study followed 3,075 well-functioning adults aged 70 to 79 for two and a half years, measuring mid-thigh muscle cross-sectional area by CT rather than estimating it. Incident mobility limitation was defined plainly: two consecutive reports of difficulty walking a quarter mile or climbing ten steps. Around a fifth of the men and nearly a third of the women hit it.
Adjusted for demographics, lifestyle and health, the lowest quartile of thigh muscle area against the highest carried a hazard ratio of 1.90 in men and 1.68 in women. Fat infiltration into the muscle and knee extensor strength ran at similar magnitudes.
That is the case for caring about mass, and it is a real one. Note what the outcome is, though. It is not death. It is stairs.
The finding that complicates the sales pitch
The same cohort produced a paper we would rather you read than skip. Newman and colleagues examined 2,292 participants aged 70 to 79 over an average of 4.9 years, 286 of whom died, and put strength and size into the same models. Quadriceps strength predicted mortality strongly — a crude hazard ratio of 1.51 per standard deviation in men and 1.65 in women. Muscle size, whether measured by CT thigh area or by DXA regional lean mass, was not strongly related to mortality, and adjusting the strength models for muscle size barely moved them.
Their conclusion is the line the supplement industry tends not to quote: muscle quality matters more than muscle quantity in estimating risk.
So hold both. Mass is protective for the functional outcomes — mobility, stairs, staying in your own house. Strength is the better predictor of dying. They are correlated but they are not the same thing, and a training programme aimed at one usually delivers both, whereas a supplement aimed at the scale reliably delivers only the scale.
The trial that settled the hierarchy
In 1994, Fiatarone and colleagues randomised 100 frail nursing home residents, mean age 87, into four groups: progressive resistance training, a multinutrient supplement, both, or neither, for ten weeks.
Muscle strength rose 113% in the exercisers and 3% in the non-exercisers. Gait velocity rose 11.8% against a 1.0% decline. Stair-climbing power rose 28.4% against 3.6%. Spontaneous daily activity went up.
The nutritional supplement had no effect on any primary outcome measure.
Thirty years on, that remains the cleanest statement of the order of operations in this whole category. People in their late eighties, in nursing homes, more than doubled their strength by lifting things. The supplement arm, on its own, did nothing.
So where does a product fit?
Narrowly, and only alongside the training. Chilibeck and colleagues pooled 22 randomised trials with 721 older participants who did resistance training two to three days a week for 7 to 52 weeks, with or without creatine. The creatine groups gained an extra 1.37kg of lean tissue mass (95% CI 0.97 to 1.76) and modest additional strength.
A follow-up meta-analysis by Forbes and colleagues examined dosing strategies and found something worth knowing before you buy: when trials using a loading phase were excluded, creatine had no greater effect than placebo on chest press or leg press strength. The effect is real, it is small, and it is conditional on details.
1.37kg of lean mass over months is not a transformation. It is a useful nudge on top of work you were doing anyway, which is exactly how we would like it described on our own label.
The rule-outs first
Unintentional weight loss, a strength drop that appeared over weeks rather than years, or muscle loss alongside fatigue and appetite change is not a supplement problem. Thyroid disease, undiagnosed diabetes, kidney disease, low-grade inflammation and some medications all cause it. Get bloods before you get a tub of anything.
Where it sits against everything else
Resistance training and cardiorespiratory fitness are the two ends of the same argument, and if you only have three sessions a week, splitting them two-and-one in either direction is a better use of your time than optimising either alone. Both belong at the top of a longevity budget, above every capsule we sell — which is the ranking we keep arriving at no matter which literature we read.
What we would actually tell you
Lift something heavy twice a week, through a full range, and add load over months. Eat enough protein to support it. Test yourself on something concrete — a sit-to-stand count, a loaded carry, the number of stairs before your legs complain — and write the date next to it.
Then, if you want the small extra, take creatine on the days you train and judge it over a season. Buy it as an adjunct to the work. Bought instead of the work, it is the most expensive thing in this article.
Good questions
Is muscle mass or muscle strength more important as you age?
Strength, if you are asking which one predicts dying. In the Health ABC cohort, quadriceps strength was strongly associated with mortality while CT- and DXA-measured muscle size was not. Mass still matters for the functional outcomes — low thigh muscle nearly doubled the risk of losing mobility. Train for strength and the mass follows; chase mass alone and you may not get the strength.
Can you build muscle in your eighties?
Yes, and the evidence is unusually direct. One hundred nursing home residents with a mean age of 87 did ten weeks of progressive resistance training and more than doubled their muscle strength, improved gait speed and stair-climbing power, and became more spontaneously active. Frailty and advanced age are reasons to supervise the programme, not to skip it.
Does creatine work for older adults, or just young lifters?
It works in older adults, modestly, and only alongside training. Across 22 randomised trials in 721 participants aged 57 to 70 on average, creatine added 1.37kg of lean tissue mass over placebo during resistance training. A separate analysis found the strength advantage disappeared when loading-phase trials were excluded. Treat it as a small assist, not a driver.
Can I take a supplement instead of lifting?
No, and the best trial in this area tested exactly that. Frail elderly participants given a multinutrient supplement without exercise saw no improvement in any primary outcome, while the exercise groups more than doubled their strength. We sell creatine and we would still rather you spent the money on a gym membership if you have to choose.
How much protein do I need to hold onto muscle?
Enough to support the training, and most people fall short rather than overshoot. Meta-analysis of protein supplementation during resistance training found no further gains in fat-free mass above roughly 1.6g per kilogram of body weight per day. Food counts toward that total. If you already eat that much protein, a powder is convenience, not nutrition.
Is sarcopenia inevitable?
Some age-related loss is expected, but the rate is not fixed and the functional consequences are largely trainable. What is not normal is fast or unexplained loss, which can signal thyroid disease, undiagnosed diabetes, kidney disease or inflammation. If your strength changed over weeks rather than years, that is a conversation with your doctor before it is a purchase.
Sources
- Visser M, Goodpaster BH, Kritchevsky SB, et al. Muscle mass, muscle strength, and muscle fat infiltration as predictors of incident mobility limitations in well-functioning older persons. J Gerontol A Biol Sci Med Sci, 2005. View study
- Newman AB, Kupelian V, Visser M, et al. Strength, but not muscle mass, is associated with mortality in the health, aging and body composition study cohort. J Gerontol A Biol Sci Med Sci, 2006. View study
- Fiatarone MA, O'Neill EF, Ryan ND, et al. Exercise training and nutritional supplementation for physical frailty in very elderly people. N Engl J Med, 1994. View study
- Chilibeck PD, Kaviani M, Candow DG, Zello GA. Effect of creatine supplementation during resistance training on lean tissue mass and muscular strength in older adults: a meta-analysis. Open Access J Sports Med, 2017. View study
- Forbes SC, Candow DG, Ostojic SM, Roberts MD, Chilibeck PD. Meta-Analysis Examining the Importance of Creatine Ingestion Strategies on Lean Tissue Mass and Strength in Older Adults. Nutrients, 2021. View study
- Morton RW, Murphy KT, McKellar SR, et al. A systematic review, meta-analysis and meta-regression of the effect of protein supplementation on resistance training-induced gains in muscle mass and strength in healthy adults. Br J Sports Med, 2018. View study
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