BACKGROUND: Strategies to minimize dynamic hyperinflation (DH) and dyspnea, such as slow chest compression (SCC), are relevant in people with chronic obstructive pulmonary disease (COPD). OBJECTIVES: To analyze the acute effects of SCC after exercise on DH and dyspnea in people with COPD and to identify responders to the technique. METHODS: This is a cross-over study with 40 patients. Two six-minute step tests (6MSTs) were performed followed by a one-minute application of SCC (6MSTSCC) or rest (6MSTCONTROL), at random. End-expiratory lung volume (EELV) and dyspnea were assessed. A difference >= 76 ml in delta EELV between SCC and control characterized the responders. RESULTS: The performance in 6MSTSCC and 6MSTCONTROL were similar. There was a greater reduction in EELV after 6MSTSCC compared to 6MSTCONTROL (124 +/- 193 ml versus 174 +/- 183 ml; p = 0.049), while there was no difference in change in dyspnea between the SCC and control groups. Twenty-one participants were SCC responders and had higher functional residual capacity (FRC 5.36 +/- 1.09 versus 4.58 +/- 0.94; p = 0.02; cutoff point 4.56; sensitivity 76%; specificity 53%; AUC = 0.71 (95%CI 0.54 to 0.87); p = 0.02). CONCLUSION: SCC applied immediately after exercise reduced DH, but did not reduce dyspnea in people with COPD. The technique is beneficial only for some patients and FRC can help to identify them.

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