Effects of acute exercise on inspiratory muscle strength and endurance in untrained women and men

J. U. Gonzales, J. S. Williams

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


Aim. The purpose of this study was to determine if sex differences are present in exercise-induced inspiratory muscle function in untrained humans. Methods. Eight young untrained women (23.8 ± 1.5 y, VO2max = 33.7 ± 4.0 mL/kg/min) and men (26.1 ± 2.0 y, VO2max = 36.7 ± 1.2 mL/kg/min) performed high-intensity cycling exercise (80% WRmax) to exhaustion. Inspiratory muscle strength and endurance were assessed pre- and post-exercise by measuring maximal inspiratory pressure (PImax) and time to task failure during a constant-load breathing test (CLBT), respectively. Results. Relative intensity and time to exhaustion during highintensity exercise was similar between women and men. Prior to exercise, PImax was similar between sexes. After exercise, women and men showed similar reductions in PImax (W: 140.4 ± 9.9 to 124.6 ± 6.7 cm H2O, P<0.05; M: 147.7 ± 10.2 to 128.1 ± 11.1 cm H2O, P<0.05). No sex difference was found in the magnitude change in PImax following exercise (W: 15.8 ± 7.9 vs. M: 19.6 ± 4.7 cm H2O). Time to task failure on the CLBT was reduced following exercise in women (360 ± 54 to 135 ± 29 s, P<0.05) and men (270 ± 36 to 150 ± 17 s, P<0.05). Women exhibited a greater reduction in time to task failure following exercise than men (W: 225 ± 55 vs. M: 120 ± 38 s, P=0.05). Conclusions. These data demonstrate that women exhibit a greater reduction in inspiratory muscle endurance following an acute bout of high-intensity exercise than men.

Original languageEnglish
Pages (from-to)268-273
Number of pages6
JournalJournal of Sports Medicine and Physical Fitness
Issue number3
StatePublished - Sep 2010


  • Inspiratory muscle fatigue
  • Resistive breathing
  • Sex differences


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