[ effect of inspiratory muscle training method on the vital capacity]

ABSTRACT

The purpose of this study was to investigate the effects of special exercises training protocol of the inspiratory muscles on the vital capacity. 62 normal subjects' female students without any respiratory disease history participated in the study. At first, all subjects participated in a familiarization session to learn a correct pattern of ventilation and then the vital capacity was measured by spirometer. The vital capacity [VC] and%80 of maximum voluntary contraction [MVC] force of inspiratory muscles were assessed and monitored by computerized spirometry machine to the subjects .The subjects were randomly assigned in two control [n=30] and experimental [n=32] groups. Subjects in the experimental group were asked to perform a daily inspiratory exercise protocol including 6 inspiration muscle contraction [using%80 of MVC]. Each contraction was separated with a rest time from the next contraction. The first rest time was 60 seconds and second rest time was 45 second and so on 30, 15, 10 seconds. The control group did not performance any other form of exercises. The VC was recorded at the end of each week in both groups and compared to the base line by paired t Test. The results revealed that there are significant increase in the VC at the end of the fifth week [P<0.001] and tenth week [P<0.001] in the experimental group while no significant change was found in the control group. These findings show that the average changes of vital capacity in end of 10 weeks increased significantly in inspiratory muscle training group rather than control group. Inspiratory muscle training is a suitable method to increase the ventilation vital capacity and further study is needed to investigate the stability of the increased VC by this method and also the effect of this inspiratory training method on the patient with respiratory disease