Table 3.

Interventions description.

Study	Outline	Duration (weeks)	Device type	Frequency, duration (time per week in minutes)	Load (% MIP)	CG activity	Intervention details
Ahmad, 2020	RCT	8	Threshold IMT	5×/week, 15-25 min (supervised)	30%	No exercise	Deep, slow breaths in a diaphragmatic pattern
Albarrati, 2020	RCT	8	Threshold IMT	7×/week, 30 min (1×/week supervised)	40%	15%	Weekly assessment, diaphragmatic breathing, 15 to 20 breaths/min
Correa, 2011	RCT	8	Threshold IMT	7×/week, 30 min (6×/week at home and 1× supervised)	30%	Minimum load (7 cmH₂O)	Weekly assessment, diaphragmatic breathing, 15 to 20 breaths/min
Kaminski, 2015	RCT	8	Threshold IMT	7×/week, 30 min	30%	No load	Weekly assessment, diaphragmatic breathing, 15 to 20 breaths/min
Mowad, 2020	RCT	12	TRAINAIR®	3×/week, 30 min (supervised)	75%	10%	6 cycles of 30 breaths
Pinto, 2021	RCT	12	POWER®breathe	7×/week, 30 min (1×/week supervised)	30%	2%	Weekly assessment, diaphragmatic breathing, 15 to 20 breaths/min

CG=control group; IMT=inspiratory muscle training; MIP=maximum inspiratory pressure; RCT=randomized clinical trial