A Comparative Study Of The Five-repetition Sit-to-stand Test And The 30-second Sit-to-stand Test To Assess Exercise Tolerance In COPD Patients

Objective: The sit-to-stand test(STST)has been used to evaluate the exercise tolerance of patients with COPD.However,mutual comparisons to predict poor exercise tolerance have been hindered by the variety of STST modes used in previous studies,which also did not consider patients' subjective perceptions of different STST modes.Our aim was to compare the five repetition sit-to stand test(5STS)with the 30-second sit-to-stand test(30STS)for predicting poor performance in the six-minute walking test and to evaluate patients' subjective perceptions to determine the optimal mode for clinical practice.Methods: Patients with stable COPD performed 5STS,30 STS and the six-minute walk test(6MWT)and then evaluated their feelings about the two STST modes by Borg dyspnea score and a questionnaire.Moreover,we collected data through the pulmonary function test,modified Medical Research Council dyspnea score,COPD assessment test,and quadriceps muscle strength(QMS).A receiver operating characteristic curve analysis of the 5STS and 30 STS results was used to predict 6MWD < 350 m.Results: The final analysis included 128 patients.Similar moderate correlations were observed between 6MWD and 5STS(r =-0.508,P < 0.001)and between 6MWD and 30STS(r = 0.528,P < 0.001),and there were similar correlations between QMS and 5STS(r =-0.401,P < 0.001)and between QMS and 30STS(r = 0.398,P < 0.001).The 5STS and 30 STS score cutoffs produced sensitivity,specificity,positive predictive value s and negative predictive values of 76.0%,62.8%,56.72% and 80.3%(5STS)and 62.0%,75.00%,62.0% and 75.0%(30STS),respectively,for predicting poor 6MWD performance.The 5STS exhibited obvious superiority in terms of the completion rate and the subjective feelings of the participants.Conclusion: As a primary screening test for predicting poor 6MWD,the 5STS is similar to the 30 STS in terms of sensitivity and specificity,but the 5STS has a better patient experience.