A simple method to derive speed for the endurance shuttle walk test.

Area of Science:

• Pulmonary rehabilitation
• Exercise physiology
• Clinical exercise testing

Background:

• The endurance shuttle walk test (ESWT) is a common assessment for individuals with chronic obstructive pulmonary disease (COPD).
• The original method for determining ESWT speed is complex and time-consuming for clinicians.
• A simplified approach to setting ESWT speed is needed to improve clinical efficiency.

Purpose of the Study:

• To evaluate the validity of the original method's components for determining ESWT speed.
• To assess the agreement between ESWT speeds derived from the original method and 85% of peak speed from the incremental shuttle walk test (ISWT).
• To determine if ESWT at 85% of ISWT peak speed elicits a comparable physiological response (V˙O₂peak).

Main Methods:

• Patients with COPD underwent two ISWTs and one ESWT, with simultaneous portable gas analysis.
• Retrospective analysis assessed if peak oxygen uptake (V˙O₂peak) could be estimated from incremental shuttle walk distance (ISWD).
• Bland-Altman analysis was used to compare ESWT speeds and V˙O₂peak between the two methods.

Main Results:

• Estimated V˙O₂peak from ISWD was lower than measured V˙O₂peak during ISWT.
• ESWT and ISWT elicited similar V˙O₂peak values (mean difference -0.2 ml·kg⁻¹·min⁻¹).
• The mean difference in speed between ESWT methods was minimal (0.15 km·h⁻¹).

Conclusions:

• The original method's components for determining ESWT speed were not fully validated in this COPD sample.
• Deriving ESWT speed from 85% of the peak speed achieved during the ISWT is a valid and comparable alternative.
• This simplified approach can enhance the clinical utility of the ESWT for COPD assessment.