Inspiratory muscle training
DeviceTreatment group received inspiratory muscle training using threshold loading device (POWERbreathe Classic, IMT Technologies Ltd. Birmingham, England) at 40% of maximal inspiratory pressure (MIP).
The MIP was measured at supervised session each week, and 40% of measured MIP value was the new training workload.
The treatment group trained for 30 min-per/day, 7 days/week, for 6 weeks. Six sessions at home and 1 session were performed at department.