Changes in EMG activation of the diaphragm ( F = 13.75 , P = 0.003 ) and external intercostal ( F = 14.33 , P = 0.002 ) ( P < 0.01 ) muscles of patients in the ITG during maximal static inspiratory efforts were significantly ( P < 0.05 ) greater than those in patients of the RMTG and the CG at post-test .