The increment of tidal volume was mainly contributed to the prolongation of inspiratorytime.
吸气流速无明显变化，潮气量增加主要由于吸气时间延长所致；
2
Inspiratorytime is measured from the beginning of inspiration to the beginning of exhalation.
吸气时间测定是从吸气开始到呼气开始。
3
Conclusion Inspiratory muscle training before CABG can improve respiratory function, decrease postsurgical pulmonary complications and shorten the time of mechanical ventilation.