Perioperative respiratory muscle training improves respiratory muscle strength and physical activity of patients receiving lung surgery: A meta-analysis

Table 4 Results about the effect of respiratory muscle training on patients receiving lung resection

	No. of studies	Mean	95%CI	P value	I2 (%)	Pheterogeneity
Primary outcomes
Respiratory function
MIP (cmH2O)	5	8.13	1.31, 14.95	0.02	66	0.02
MEP (cmH2O)	4	13.51	-4.47, 31.48	0.14	91	< 0.001
Secondary outcomes
Physical activity	2	-	-	0.006/0.035	-	-
Exercise capacity
6MWD (m)	3	9.96	-34.61, 54.54	0.66	63	0.06
CPET/VO2peak (mL/min/kg)	2	2.44	-2.36, 7.24	0.32	96	< 0.001
Pulmonary function
FEV1 (L)	3	0.06	-0.07, 0.19	0.39	13	0.32
FVC (L)	2	0.29	-0.05, 0.64	0.10	0	0.96
Quality of life
Pain (VAS)	2	0.67	-0.99, 2.32	0.43	61	0.11
Dyspnoea (VAS)	2	-0.16	-0.58, 0.25	0.44	0	0.61
EORTC QLQ-C30	1	-	-	-	-	-

MIP: Maximal inspiratory pressure; MEP: Maximal expiratory pressure; FEV1: Forced expiratory volume in one second; FVC: Forced vital capacity; 6MWD: 6-min walking distance; CPET: Cardio-pulmonary exercise test; VO_2peak: Peak oxygen consumption; MET: Metabolic equivalent; VAS: Visual analog scale.