What instrument is primarily used for measuring distance in the two-minute walk test?

In the two-minute walk test, the primary purpose is to measure the distance that a participant can walk in a set period, specifically two minutes. The most effective instrument for accurately measuring this distance is a measuring tape or a measuring wheel. These tools allow for precise measurements of the distance covered by the participant during the test, which is vital for evaluating their mobility and endurance.

Using a measuring tape or wheel provides a clear and objective distance assessment, which is essential for determining improvements or changes in a participant's physical capabilities over time. While a stopwatch could help time the two-minute duration, it does not provide any information about the distance traveled. A pedometer could measure steps but may not accurately reflect the total distance walked, especially if the walking pace or stride length varies significantly among participants. Similarly, a heart rate monitor is useful for tracking heart rate changes during physical activity but does not measure distance. Thus, the measuring tape or measuring wheel is indeed the correct instrument to use for this specific test.