Conclusion
Trends for improvement following respiratory muscle
training were observed for expiratory muscle
strength, vital capacity and residual volume,
whereas not sufficient support is available for
improved inspiratory muscle strength and endurance.
Insufficient data was available to provide
conclusions on the effects on quality of life,
respiratory complications and exercise performance.
Further randomized controlled trials should
clarify these issues.
Competing interests
The authors declare that they have no competing
interests.