Can you pass this 30-second chair test? It may reveal how you are ageing

How easily can you get up from a chair without using your hands?

It may sound like an unremarkable question, but the answer can reveal more about your physical fitness than you might expect. As the body ages, changes in muscle strength, balance and endurance can gradually make ordinary movements harder. Sometimes, these changes become noticeable not during exercise, but while carrying out something as routine as standing up from a seat.

That is where the simple sit-to-stand test comes in. 

The exercise turns a familiar daily movement into a short physical assessment. By counting how many times a person can stand up and sit down in 30 seconds, it gives an indication of lower-body strength and endurance, two abilities that are closely connected to mobility and independence later in life.

It is not a test that can tell you your exact "biological age". But it can offer a useful snapshot of how your body is handling one of the most basic demands of everyday life.

Your legs may say more than your birthday

Ageing is often reduced to a number, but chronological age does not necessarily tell the whole story about physical function.

Someone may be older but remain strong, mobile and physically independent, while another person of the same age may struggle with stairs, getting out of bed or rising from a low seat.

Standing up requires several muscle groups to work together. The thighs and hips generate much of the force needed to lift the body, while the core helps with stability and balance. Repeating the movement also tests muscular endurance.

That combination makes the sit-to-stand movement particularly useful when assessing functional ability.

The US Centers for Disease Control and Prevention includes the 30-second chair stand in its STEADI programme, which aims to reduce falls among older adults. The assessment can help identify reduced leg strength and endurance that may be linked to mobility difficulties and fall risk.

Test takes just 30 seconds

The assessment requires little more than a stable chair and a timer.

For the standard CDC version, the chair should have no armrests and a seat height of roughly 17 inches, or 43 centimetres. It should be placed against a wall or another firm surface so it cannot move during the test.

The participant sits in the middle of the chair with their feet flat on the floor. Their arms are crossed at the wrists and placed against the opposite shoulders.

When the timer begins, the aim is to stand up completely and then return to the seated position, repeating the movement as many times as possible for 30 seconds.

Every fully completed stand counts towards the final score.

There is a small allowance at the end of the test: if the person is already more than halfway through standing when the 30 seconds are up, that repetition can be counted as complete under the CDC protocol.

The standard assessment is performed without pushing off with the arms. If someone needs their hands to get themselves up, the protocol assigns a score of zero.

What is a "good" score?

There is no single number that represents good performance for everyone.

The CDC has age- and sex-specific reference values for adults between 60 and 94. They become lower with advancing age, reflecting the expected changes in physical performance across older age groups.

For adults aged 60 to 94, the CDC's reference scores vary by age and sex. Among men aged 60 to 64, 14 repetitions is the reference figure, compared with 12 for women in the same age group. For those aged 65 to 69, the figures are 12 for men and 11 for women.

Between 70 and 74, the reference stands at 12 repetitions for men and 10 for women. For people aged 75 to 79, the figures drop to 11 for men and 10 for women. Among those aged 80 to 84, the reference scores are 10 for men and nine for women.

For adults aged 85 to 89, eight repetitions is the reference figure for both men and women. In the 90 to 94 age group, the figures fall further to seven repetitions for men and four for women.

A result below the relevant reference figure may suggest that a person's performance is lower than expected and could indicate a need for further assessment, particularly if they also have mobility problems or a history of falls.

But these numbers should not be treated as a pass-or-fail examination.

The result can be influenced by several factors, including a person's height, the height of the chair, how physically active they are and whether they have an injury or an existing medical condition.

Someone recovering from surgery, for example, could understandably perform differently from an otherwise healthy person of the same age.

What if you are not 60 yet?

You do not have to wait until your 60s to be interested in sit-to-stand performance.

The important point is that younger adults should not use the CDC's older-adult reference values to judge themselves.

Researchers have examined other versions of the assessment in younger populations. One study involving almost 7,000 Swiss adults looked at a one-minute sit-to-stand test. Among those aged 20 to 24, the median performance was 50 repetitions for men and 47 for women, with considerable variation between individuals.

That test, however, should not be confused with the CDC's 30-second assessment. They use different durations and protocols, so a one-minute result cannot simply be divided by two and compared with the CDC's figures.

Research involving healthy younger adults has nevertheless found a relationship between sit-to-stand performance and more detailed measures of aerobic capacity and endurance. In that sense, the movement can provide a quick glimpse into functional fitness well before old age.

A low number is a clue, not a diagnosis

Suppose someone struggles to complete many repetitions. What does that actually mean?

In some cases, it may reflect weaker or less-enduring muscles in the lower body. For older adults, poor performance can also point towards difficulties with mobility and a greater vulnerability to falls.

The same type of functional assessment is used in healthcare for people whose physical capacity needs to be monitored. Sit-to-stand tests can form part of assessments during recovery from surgery and in people being treated for conditions affecting the heart, lungs or those undergoing cancer treatment.

But the test cannot tell someone that they have heart disease, lung disease or another specific illness.

Nor can one score determine how quickly a person's body is ageing.

Instead, it is better understood as one piece of the larger picture. A healthcare professional may consider the result alongside symptoms, medical history and other physical assessments before deciding whether further evaluation is needed.

Despite its simplicity, the test involves repeated physical exertion and is not appropriate for everyone to attempt without guidance.

People who have recently had surgery, are recovering from an injury, experience frequent dizziness or falls, or have been advised by a healthcare professional to avoid physical exertion should seek medical advice before trying it.

The test should also be stopped immediately if it causes chest pain, severe breathlessness, dizziness or unusual discomfort.

Sometimes, the most revealing measure of ageing is not the number of candles on the cake, but how easily you can get back up after sitting down.