Does my grip strength say anything about how long I will live?
Low grip strength is associated in large-scale research with a noticeably higher risk of premature death, though muscle power says even more. Feel free to measure your grip strength as one of the signals of your overall muscle function, but do not draw hard conclusions from it without weighing the rest of your fitness.
Grip strength does indeed say something about how long you will live, but it is a signal, not a cause. The PURE study with 140,000 participants and the UK Biobank study with more than 500,000 participants consistently showed that every 5 kg reduction in grip strength is associated with a 16 to 20 percent higher risk of death. That is a large, robust association.
The association is strongest for cardiovascular disease. In the PURE study, grip strength was an even better predictor of cardiac death than blood pressure. For every 5 kg reduction in grip strength, the risk of dying from cardiovascular disease increased by 17 to 22 percent. Lung diseases were also strongly associated with low grip strength. An association with cancer existed as well, but was smaller. Notably, no association was seen for prostate cancer.
Low grip strength is also associated with more falls, bone fractures and longer hospital stays. In older adults it is moreover a measure of malnutrition and loss of independence.
Grip strength does not tell the whole story, however. A recent study with more than 3,800 participants suggests that muscle power, meaning how quickly and forcefully your muscles move, is a far stronger predictor. The difference between the weakest and strongest group was for muscle power nearly six times as large as for grip strength alone. When corrected for other factors, the independent association of grip strength even disappeared. This adds nuance to the message: grip strength is a convenient measurement, but muscle speed and explosive strength appear to be even more relevant.
Reference values help put this in perspective. Men reach a peak of around 51 kg grip strength in their thirties, women around 31 kg in their late twenties or early thirties. If you as a man score below 26 kg, or as a woman below 16 kg, large-scale research classifies that as 'weak'. By the age of eighty, roughly a quarter of people have a grip strength that far below their peak. Asians, women and people with sedentary occupations have lower average values, so the threshold is not the same for everyone.
Based on two very large observational cohort studies (PURE, n≈140,000; UK Biobank, n≈500,000), supplemented by a smaller prospective study (CLINIMEX, n≈3,800) and multiple reviews. All associations are associative; a causal relationship has not been proven. The CLINIMEX study has no PMID and has not yet been independently confirmed.
Can grip strength predict how long you live?
Grip strength is a remarkably strong predictor of longevity, stronger than blood pressure in some large studies. Whether improving your grip strength extends your life has not yet been proven, but measuring it already provides useful information about your overall muscle strength and fitness.
Does my walking speed say anything about how fast I am ageing?
Yes, your walking speed says something about how your body is ageing. People who walk slower than 0.8 to 1.0 metres per second have a clearly raised risk of frailty, muscle loss, falls, and early death. That is a signal to take targeted action.
Does your balance on one leg say something about your life expectancy?
In people between the ages of 65 and 80, your balance on one leg does say something about your health risk, but it is a signal, not a prediction: a poor score is a reason to work on strength and balance, not a reason to worry without doing so.
How much exercise do I need to live longer?
The biggest health leap comes from just a little exercise. Going from nothing to 150 minutes per week gives a 31% lower chance of dying early; beyond that the benefit grows somewhat further but then levels off.
Why is muscle strength so important for healthy ageing?
Muscle strength is one of the best-supported pillars of healthy ageing: losing it increases the risk of falls, disability and premature death, while resistance training demonstrably reduces those risks. So do regular strength exercises, and if you are unsure how, discuss it with a physiotherapist.
How many extra years of life does regular walking provide?
Regular walking is associated with two to six extra years of life, with the greatest gain for people who currently barely move. Even half an hour per day makes a measurable difference.