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

Figure 1 The flow diagram of this systematic review and meta-analysis.

Figure 2 Forest plot about the effect of perioperative respiratory muscle training on maximal inspiratory pressure.

Figure 3 Forest plot about the effect of perioperative respiratory muscle training on maximal expiratory pressure.

Figure 4 Forest plot about the effect of perioperative respiratory muscle training on 6-min walking distance.

Figure 5 Forest plot about the effect of perioperative respiratory muscle training on forced expiratory volume in one second.