Study intervention
Participants performed a 6-week supervised intervention protocol with an RMT device (Threshold IMT, Philips Respironics, Tangmere, UK); see [Training sessions were performed twice daily, 5 days a week for 6 weeks. For each session, participants completed three to five sets of 12 breaths for inspiratory and then expiratory muscle training. Each set was separated by two minutes of quiet breathing. Training intensity was initially set at 30% of the participant’s P