[Fall Prevention Vol. 7] Walking speed is a "vital sign of life." How many seconds does it take you to walk 10m?
A "Comprehensive Test" of Functional Anatomy
In the previous issue (Vol. 6), we explained "clearance" to prevent the toes from catching on the ground, and the coordinated effort of the ankle, hip, and pelvis that supports it.
So, how can we quickly evaluate in a clinical setting whether this whole-body teamwork is functioning well? While measuring the range of motion of each joint one by one is important, there is a supreme indicator that shows the result of their integration. That is "walking speed". In fact, walking speed is not just "speed of movement"; it is also called the "6th vital sign" because it can predict fall risk, future healthy life expectancy, and even survival rate. This time, we will explain the "10m walk test," the most powerful evaluation that can be done with just a stopwatch.
What is the 10m walk test?
The measurement method is very simple. Just have the patient walk a 10-meter straight path and measure the time. (*To be precise, to eliminate the effects of acceleration and deceleration, a 2m approach path is set at both ends, and the time for the middle 10m is measured.)
Comfortable walking speed: The speed when walking at a "normal pace"
Maximum walking speed: The speed when walking "as fast as possible"
To look at fall risk, let's first focus on "comfortable walking speed."
The fateful number: 1.0 m/s (10m in 10 seconds)
Once you have calculated the patient's walking speed, try applying it to the following criteria (cut-off values). The most important reference number is "1.0 m/s." In other words,whether they can walk 10m in 10 seconds.
1.0 m/s or more (less than 10 seconds): A speed at which one can safely cross a crosswalk while the light is green. Independent level for outdoor walking.
Less than 0.8 m/s (12.5 seconds or more): A level where restrictions on outdoor activities begin to appear. Fall risk increases.
Less than 0.6 m/s (about 16.5 seconds or more): Outdoor walking is dangerous. A state that should basically be judged as "indoor living level."
What if a patient nearing discharge has a comfortable walking speed of "0.5 m/s"? It is dangerous to say "discharge is OK because they can walk with a cane." It is highly predictable that they will definitely be caught by a red light at an outdoor crosswalk and have an extremely high risk of falling in a panic.
Let's analyze the "content" of the speed decline
The true value of the 10m walk test lies not in just ending with "the time is slow," but in analyzing "why is it slow?"
Walking speed is determined by the following multiplication: Walking speed = Step length × Cadence (walking rate: steps per minute)
Try counting "how many steps" the patient took while walking 10m.
Step length is extremely short (shuffling gait): It is suspected that the joints are stiff (range of motion limitation) or that there is insufficient muscle strength (such as the iliopsoas) to bring the legs forward significantly.
Step count is normal, but the rhythm is slow (decreased cadence): It is suspected that the time spent supporting weight on one leg is extremely short (= instability or pain in the stance phase), or that they are being too cautious due to fear.
By looking at the "result" of time (speed) while focusing on the "causes" of step length and rhythm, a functional anatomical approach becomes clear.
Summary: What to do in tomorrow's clinical practice
Tomorrow, when your patient does walking practice, please try measuring their 10m time with a stopwatch.
"Can they walk 10m in 10 seconds? (1.0 m/s)"
Just by knowing this reference value, the persuasiveness of your discharge guidance and environmental settings (such as how to handle going outdoors) will change dramatically. Let's step up from "they seem to be walking okay" to evidence-based assessment that "they are achieving a practical speed."
Next time preview
"They have muscle strength and explosive power, and their walking speed exceeds 1.0 m/s. But once they go home, they stop moving and end up falling..."
What is the true cause of this gap between "physical function" and "actual behavior"? Next time is the "Psychology Edition." I will explain the monster known as "Fear of Falling" that puts a brake on a patient's mind. Look forward to it!
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▼ [ 26 minutes to acquire a "reliable eye" for fall prevention ]