The incremental shuttle walk test (ISWT) is a simple and reliable tool that can be performed on any flat surface, with no need of specific ergometers [4,5]. The incremental shuttle walk distance (ISWD) correlates consistently with peak VO2 during CPET in patients with airflow limitation performed both on a treadmill (r50.88) and a cycle ergo- meter (r50.71) [4,6]. The ISWT presented appropriated measurement properties for assessing the physiologic re- sponses, both in healthy children and adolescents and in pa- tients with cystic fibrosis [7]. These results suggest that ISWT is suitable to assess functional exercise capacity in young patients with chronic diseases. Walking on a flat sur- face and the slight increase in the walking speed make the ISWT more representative of physical activities in daily life [8]. Despite its widespread use on patients with chronic dis- eases, we are not aware of studies that evaluated the walk- ing physiologic responses in patients with AIS using ISWT