Figure 1: Flow diagram, consort flowchart for participant recruitment and allocation. 31 participants were enrolled in the study; 13 participants were excluded from the study because they did not meet the inclusion criteria (n = 12) or for other reasons (n = 1). The intervention group was treated with oral motor respiratory exercise (OMREX) and vocal intonation therapy (VIT) (total n = 9, ASIA B n = 7, ASIA C n = 2); the control group underwent respiratory function training [total n = 9, American Spinal Injury Association (ASIA) B n = 6, ASIA C n = 3]. Among the nine participants in the intervention group, all participants were able to sing the items used for training during the entire study period. The data analysis included a sample of 18 spinal cord injury (SCI) patients.