Mobility Tests Offer Valuable Insights Into Healthy Aging, but They Are Not a Crystal Ball
核心洞察
Mobility tests such as grip strength, balance, and sit-to-stand assessments provide useful indications of stamina, strength, and fall risk in older adults.
Experts caution that a poor or declining result signals a need to investigate why function is changing, rather than predicting how long someone will live.
Screening tools like the viral sit-to-stand test help narrow down underlying issues but do not provide enough information for a full diagnosis.
Hand grip strength, balance tests, and standing up from a seated position on the floor are often touted as measurements of healthy aging and even predictors of longevity. These physical challenges can provide valuable indications of stamina and strength, estimate the risk of falls—which increase older adults' risk of death—and prove useful to doctors who work to address aging or treat people with injuries. Yet experts caution that they are no crystal ball.
"A poor or declining result is a reason for a health professional to investigate why function is changing, rather than gauging how long someone will live," said Auriel Willette, an expert on brain aging at Rutgers University.
What Mobility Tests Entail
"Sit-to-stand" tests come in several forms. The U.S. Centers for Disease Control and Prevention's 30-second chair-stand test is designed for patients older than 60, measuring how many times they can stand up within that time period. Another version, popularized on social media, asks a person to move from standing, to sitting cross-legged on the ground, and then back up to standing. Making one's way down to the floor is worth 5 points, as is standing up, for a total score of 10. A point is lost for each support used (such as a hand or knee), and half a point is deducted if the person is unsteady. The score is zero if the individual is unable to sit or stand without external help.
Doctors said they have not seen this test used with older U.S. adults, but researchers in Brazil published studies in 2020 and 2025 concluding that middle-aged people who scored higher were less likely to die within about a decade.
Many American doctors use a test called "Timed Up and Go," or TUG. It requires the patient to get up from a chair, walk 10 feet (3 meters), and come back to their seat, allowing doctors to evaluate a person's balance, mobility, and lower extremity strength all at once.
Dr. George Hennawi, who treats older adults at MedStar Health in Baltimore, said all the tests are meant to pinpoint specific weaknesses and narrow down their underlying cause, whether that is knee pain, slow reflexes, poor balance, or feeling winded or dizzy because of cardiovascular issues. "The key to react to it is to understand where did we not do well," he said.
Screening Tools, Not Full Diagnoses
Tests like the viral sit-to-stand one are what doctors call screening tools. They are helpful in narrowing down issues, but they do not provide enough information for a full diagnosis.
Other popular tests for a person's "physiological age," or how the body is aging, include tests of grip strength, walking speed, gait steadiness, and balance. Such tests look at how hard a hand can squeeze something, whether a person favors one side while walking, how long and well they can stand on one leg, and how far forward they can reach without becoming unsteady.
Many doctors also use these challenges to understand a person's risk for "frailty (搜索)," a medical condition that means the body is less able to handle strain from illness or injury. Doctors sometimes use a 10-minute assessment called the Short Physical Performance Battery, which includes several tests including gait, balance, and strength. It was developed by the National Institute on Aging, and large clinical trials have shown it predicts mortality, disability, and more.
At the University of California, Los Angeles' Multidisciplinary Falls Clinic, Dr. David Lee said it is important to look across multiple tests in combination. Grip strength, for example, is predictive of many different things, but it can be affected by arthritis (搜索), stroke (搜索), or even simply not conditioning those muscles. "It's one measure of many," Lee said.
Good Health Is About More Than a Good Score
Experts note that strength and mobility are just one part of healthy aging. Tests of cognition, memory, hearing, eyesight, and many other measures are key to evaluating how someone is aging. They also cautioned against training to pass a test. Instead, they advise keeping the big picture in mind: exercise the whole body, eat nutritious meals, address stress in a healthy way, prioritize sleep, and take care of the heart.
Experts also said it is important to know the context in which a test has been studied and verified. If a test is shown to predict an outcome for one age group, the performance standards will not necessarily apply to others.
If a person scores poorly in a mobility test and is concerned about fall risk, or has recently fallen, they should talk to their doctor. The test results are the first step in determining whether an assistive device, physical therapy, a change in medications, or something else is needed, said Emily Nabors, a falls prevention expert with The National Council on Aging.
She cited one estimate that more than a quarter of older adults fall each year, but most of them do not tell their doctor about it. "If you've fallen, you might feel fine," she said, "but you might not be fine at all."