Box 2. Types of respiratory training interventions and training devices
Abbreviation	Written in full	Aim intervention	Performance and devices
AS	Air stacking	Increase the inspiratory phase to improve cough effectiveness.	Stacking air behind the glottis by performing consecutive lung insufflations using a manual resuscitator bag.
BS	Breath-stacking	Increase long volumes, target lung expansion and prevent atelectasis.	Stacking air behind the glottis by performing successive breaths until no inspiratory volume was observed using a ventilometer (Ferraris Mark Wright ® 8, Middlesex, England).
EMST	Expiratory muscle strength training	Improve respiratory muscle strength, lung volumes, swallowing function and phonatory capacity.	Perform maximum expiratory muscle flows against resistance using a training device as EMST 150 (Aspire products LLC., USA), Threshold® (Philips Respironics, USA) or PEP valve (Vital Signs Inc., Totowa, NJ, United States)
IMST	Inspiratory muscle strength training	Improve respiratory muscle strength and phonatory capacity.	Perform maximum inspiratory muscle flows against resistance using a training device as POWERbreathe® (Southam, Warwickshire, UK) or Threshold® (Philips Respironics, USA). Aims to improve respiratory muscle strength.
IS	Incentive spirometer techniques	Increase lung volumes, target lung expansion and prevent atelectasis.	Performing a slow and deep breathing to total lung capacity has been reached, using an incentive spirometry (Voldyne 5000 ®; Sherwood Medical, St Louis, USA).
PT	Postural training	Conduct as swallowing intervention.	General postural compensation techniques were conducted being chin tuck, head rotation, head tilting, bending head back, and lying down.