Hi Kirill,
If you are refering to the Incremental Shuttle Walk Test (ISWT), here is what I found: The ISWT is available from Prof Sally Singh, Department of Respiratory Medicine, Glenfield Hospital NHS Trust, Groby Road, Leicester LE3 9QP, UK or email: visit University Hospitals of Leicester NHS Trust for further information on how to access.
Link: https://pulmonaryrehab.com.au/patient-assessment/assessing-exercise-capacity/the-incremental-shuttle-walk-test-iswt/