Document Type


Publication Date




  • Diaphragmatic fatigue during maximal exercise causes decreased blood flow to exercising limbs.
  • Inspiratory muscle strength training (IMST) may decrease diaphragm fatigue.
  • Current studies use 50% of maximal inspiratory pressure (MIP) for IMST, but optimal dosing at higher intensities has not been well explored.


  • Investigate the impact of high intensity IMST on aerobic capacity and maximal inspiratory pressure in healthy adults.


  • This study was IRB approved by the university.
  • All participants provided informed consent, and demographic information was collected.


  • VO2 max did not change significantly in either intervention group after intervention period (p=0.143).
  • Groups demonstrated significant improvement in MIP (p=0.011), but there was no significant difference between groups (p<0.638).


  • VO2 max did not significantly change in the control or intervention groups.
  • Post-intervention MIP measurements were significantly improved in both groups, but there was no significant difference between either group.
  • High intensity IMST may not improve aerobic capacity in young, healthy adults after an 8-week intervention period.

Clinical Relevance

  • Maintaining diaphragmatic strength with IMST may help minimize respiratory fatigue and be useful for healthy adults with injuries limiting their mobility.
  • Further research is needed to evaluate optimal IMST intensity for maximal benefit as 80% may be too intense.



To view the content in your browser, please download Adobe Reader or, alternately,
you may Download the file to your hard drive.

NOTE: The latest versions of Adobe Reader do not support viewing PDF files within Firefox on Mac OS and if you are using a modern (Intel) Mac, there is no official plugin for viewing PDF files within the browser window.