Effects of inspiratory and expiratory muscle training in normal subjects

Makoto Sasaki, Hajime Kurosawa, Masahiro Kohzuki

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


The present study aimed to clarify the effects of inspiratory muscle training (IMT) and expiratory muscle training (EMT) on ventilatory muscle strength, pulmonary function and responses during exercise testing. Young healthy women were randomly assigned to 3 groups: IMT (n=16); EMT (n=16); or untrained normal controls (NC, n=8). Subjects in the IMT and EMT groups trained for 15 minutes twice daily over 2 weeks at loads of 30% maximal inspiratory and expiratory muscle strength, respectively. Ventilatory muscle strength (maximal inspiratory and expiratory muscle strength; PImax and PE max, respectively), pulmonary function and progressive exercise testing was performed. Both PImax and PEmax increased in the IMT group, and PEmax increased in the EMT group. Neither trained group demonstrated any change in pulmonary function or peak values during exercise testing. In the IMT group, exercise-induced increases in heart rate, oxygen uptake (VO2/kg) and rating of perceived exertion (RPE) decreased with training, as did increases in VO2/kg and RPE in the EMT group. The increased ventilatory muscle strength in both IMT and EMT groups might improve ventilatory efficacy during exercise, and increased inspiratory muscle strength might facilitate oxygen delivery through improved circulatory responses.

Original languageEnglish
Pages (from-to)29-37
Number of pages9
JournalJournal of the Japanese Physical Therapy Association
Issue number1
Publication statusPublished - 2005


  • Dyspnea
  • Exercise tolerance
  • Expiratory muscle training
  • Inspiratory muscle training
  • Ventilatory muscle strength

ASJC Scopus subject areas

  • Physical Therapy, Sports Therapy and Rehabilitation


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