Not All Corridors are Equal: Corridor Length Affects 6-minute Walk Test Performance-A Randomized Crossover Trial

The recommended corridor length for the 6-minute walk test (6MWT) is 30 meters. However, it is not always feasible in clinical practice. The objective of this study was to compare walking distance and hemodynamic responses during 6MWTs performed in 10-, 20-, and 30-meter corridors in healthy young adults.

Thirty-four healthy young adults (mean age: 21.2±1.5 years; female/male: 25/9) completed three randomized 6MWTs in 10-, 20-, and 30-meter corridors on separate days and with a crossover design. Walking distance, mean walking speed, and step counts were measured. Heart rate, blood pressure, respiratory rate, peripheral oxygen saturation, dyspnea, and fatigue were recorded at baseline (Pre), immediately post-test (Post), and at 3 (R3) and 5 (R5) minutes of recovery. Data were analyzed using the Friedman test with post-hoc Wilcoxon signed-rank tests and Bonferroni correction.

Walking distance and speed were significantly lower in the 10-meter corridor than in the 20- and 30-meter corridors (P < 0.05), whereas step counts did not differ (P = 0.065). Hemodynamic responses were similar in all tests, except for increased post-test fatigue and dyspnea at R5 during the 10-meter corridor test (P < 0.05).

Although hemodynamic responses were comparable across different corridor lengths, the 10-meter corridor led to an underestimation of walking distance by ~60 meters and to increased subjective fatigue and dyspnea. A 20-meter corridor may serve as a feasible alternative when the standard 30-meter corridor is unavailable in clinical practice, whereas a 10-meter corridor should be avoided.