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A comparison of inspiratory muscle fatigue following maximal exercise in moderately trained males and females Ozkaplan, Atila


Exercise-induced inspiratory muscle fatigue (IMF) has been reported in males but there are few reports of IMF in females. The fatigability of locomotor muscle has been reported to be different between males and females, where females are more resistant to fatigue. It is not known if a gender difference exists for inspiratory muscle strength following heavy exercise. The purpose of this study was to compare inspiratory muscle strength between a group of moderately-trained males and females following maximal exercise. Specifically, the relationship between fatigue and subsequent recovery of maximal inspiratory pressure (MIP) following exercise to maximal oxygen consumption (VO[sub 2max]) was examined in both genders. Eighteen males (23±3yrs; mean±SD) and sixteen females (23±2yrs) completed 10 MIP and 10 maximal handgrip strength (HG) maneuvers to establish a baseline. Subjects then performed a progressive intensity VO[sub 2max] test on a cycle ergometer. Post-exercise MIP and HG were assessed successively immediately following exercise and at 1, 2, 3, 4, 5, 10, and 15 min. VO[sub 2max] relative to fat-free mass was not statistically different between males (62±7ml‧kg⁻¹‧min⁻¹) and females (60±8ml‧kg⁻¹‧min⁻¹). Males had higher absolute MIP values (-cmH₂O) than females at all time intervals (p<0.05). Immediately following exercise, MIP was significantly reduced in both genders (M = 83±16%; F = 78±15% of baseline) but HG values were not different than resting values. MIP values remained depressed for both males and females throughout the 15 min (p<0.05). Differences for MIP between M and F were not statistically significant at any measurement time (p>0.05). IMF was observed immediately following maximal exercise in both males and females and the pattern of recovery was the same between genders.

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