Gender differences in the fatigability of the inspiratory muscles

Joaquin Gonzales, Barry W. Scheuermann

Research output: Contribution to journalArticle

Abstract

PURPOSE: The purpose of the present study was to determine whether gender differences are present in the fatigability of the inspiratory muscles of humans. Based on evidence for a gender difference in the oxygen cost of breathing, we hypothesized that females would result in a greater magnitude and/or faster rate of inspiratory muscle fatigue than males. METHODS: Eleven females and males (N = 22) performed resistive breathing at a target pressure of 70% of maximal inspiratory pressure (PImax). Rate of inspiratory muscle fatigue was calculated from measures of PImax taken every 2 min during resistive breathing, and recovery of inspiratory muscle strength was assessed up to 45 min following task failure. RESULTS: Resting PImax was found to be lower for females than males (F:137.0 +/- 7.6 cm H2O; M:172.5 +/- 9.8 cm H2O, mean +/- SE, P </= 0.05). During resistive breathing, females exhibited a slower absolute and relative rate of muscle fatigue than males (F: 1.5 +/- 0.4 cm H2O.min(-1);
Original languageEnglish
Pages (from-to)472-479
JournalMedicine & Science in Sports & Exercise
StatePublished - Mar 2006

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