Background: The 6MWT is an important test of the physical performance in the context of PR. As its implementation is often difficult in ambulant sector because of space restriction the STST could be an easier option. We investigated if and how strongly the performance in both tests changes and how the results correlate.Methods: In addition to the 6MWT the STST was performed at the beginning and the end of PR in 204 consecutive COPD patients (GOLD II-IV, admission: 02-07/2014, Øage: 57.3, m: 67%, FEV1: 47.4% pred.) The test records how often a patient is capable in 1 minute to rise from a 48 cm high chair.Results: See table 1.

Table 1:Change in performance
 T0 (m ± sd)T1 (m ± sd)D (m ± sd)SRM (CI)p
6MWT437.8 ± 112.1523.8 ± 110.384.2 ± 60.01.4 (1.21 - 1.59)< 0.001
STST24.2 ± 7.528.3 ± 8.04.0 ± 4.30.92 (0.76 - 1.08)< 0.001
STST and 6MWT correlated to T0 (r=0.64) and to T1 (r=0.67). Concerning the change (T1-T0) there was no relevant correlation (r=0,2) (see figure 1).

Discussion: Based on the current data both tests seem to be well responsive, with a significant advantage to the 6MWT. The STST was easy to perform. The high correlation of the results indicates that the STST provides similarly meaningful results concerning the performance as the 6MWT.Conclusion: Especially in the ambulant sector the STST can be seen as an alternative to the 6MWT.
SRM = Standardized Response Mean (effect size)