By Dr. Aarthi Kannan

(The author is a Geriatrician/senior care specialist practicing at PD Hinduja Hospital, Mumbai)

While we often track blood pressure and heart rates, it turns out that the simple act of rising from a chair is one of the most indispensable vital signs we have. At the Geriatric Clinic at PD Hinduja Hospital, we view this movement as a window into your long-term independence.

As a geriatrician practicing in Mumbai, I view the sit-to-stand test as a pivotal tool in assessing healthy aging. There are a few variations of this test. I typically use the 30 second chair stand test commonly known as the 30CST. It must be done in the clinic setting under proper medical supervision after evaluating whether it is applicable to a patient and whether they are comfortable performing it painlessly and safely.

How is this test done?

It involves having the patient sit on a sturdy, armless chair with feet flat, crossing their arms over their chest. On the word “Go” they are asked to stand up fully and sit back down, and repeat this as many times as possible within 30 seconds.

Duration and indications of the 30CST:

I typically use the 30-second chair stand test (30CST) because it is efficient and evidence-based. A good score - usually 12 or more, depending on age - indicates strong lower-body muscular endurance and functional independence. It shows you have the reserve/engine to perform your routine daily tasks like getting off the commode or out of a car without needing anybody’s help.

Link to overall health

Standing up is a complex coordination of our quadriceps muscle strength, balance, and joint flexibility. If you can do this easily, it reflects a healthy neuromuscular system. In my practice, being able to safely and comfortably stand up without using your hands is a reliable indicator of functional youthfulness and preserved muscle mass (preventing sarcopenia).

Fall Risk & heart health

A very low score on the 30CST - i.e. fewer than 8 reps in 30 seconds, is a red flag for high fall risk and frailty. In fact, some studies even show that less than 12 reps in 30 seconds identifies a high risk profile for falls.

While it is primarily a strength test, it may give us some idea on cardiovascular efficiency - so if you are breathless after 30 seconds of this test, it may suggest poor aerobic capacity. Research suggests that low scores often correlate with higher hospital admission rates.

Sit-to-stand (30CST) vs 6-Minute walk test (6MWT)

The 30CST measures power and strength, whereas the 6-Minute Walk Test (6MWT) measures aerobic endurance and stamina. Think of the 30CST as your ability to get up and go, while the 6MWT tracks how far your heart and lungs can take you on a walk at Marine drive or Shivaji park.

When is the 30CST prescribed?

I prescribe the 30CST during geriatric assessments wherever it is likely to be reliable - especially a few days to weeks after a fall (provided the patient has not sustained a fracture or significant injury) or when a patient feels weakness in their legs. It is also a good baseline before starting physiotherapy. Since it requires no equipment other than a standard chair and a stopwatch, I find it to be a clinic-friendly tool to monitor my patients’ progress over time. However, people with severe arthritis or inflammatory arthritis may just not have the requisite joint support to perform this test reliably or safely.

Improving poor test results

In many cases, strength can be regained. The key is to incorporate progressive resistance training with a dedicated trained professional who helps you, along the lines of squats and lunges after a patient is medically assessed and if they are deemed safe to do them. As a Geriatrician, I work closely with Orthopedic surgeons and physiotherapists to help patients have a multidisciplinary and safe approach to mobility that they each can safely tolerate. Improving core stability and sit-to-stand drills (repeatedly sitting and standing with proper form) are key. I often recommend using a slightly higher chair initially and gradually moving to lower surfaces to build power over time.

Where 30CST may not be reliable

The test may be unreliable in advanced or inflammatory arthritis like rheumatoid arthritis because -

Pain or joint deformity can be limiting factors: If a patient slows down their pace or stops at 5 reps because their knees are in pain, it may be because their joints are distressed and not necessarily as their muscles are weak (though muscles often are weaker in these patients due to limited day to day mobility and lesser ongoing stimulus for muscle maintenance)
Mechanical instability: Severe bone-on-bone arthritis can cause the joint to give way, making the rapid nature of the 30CST test potentially unsafe or discouraging
Inflammatory flares: During an arthritis flare-up, joint swelling physically restricts the range of motion needed to complete a full stand, and will likely skew the test results

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The Power of Rising From a Chair: Why Your Chair Is an Excellent Tool to Measure Health