Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-14466
Verges, S; Sager, Y; Erni, C; Spengler, C M (2007). Expiratory muscle fatigue impairs exercise performance. European Journal of Applied Physiology, 101(2):225-232.
- Registered users only
High-intensity, exhaustive exercise may lead to inspiratory as well as expiratory muscle fatigue (EMF). Induction of inspiratory muscle fatigue (IMF) before exercise has been shown to impair subsequent exercise performance. The purpose of the present study was to determine whether induction of EMF also affects subsequent exercise performance. Twelve healthy young men performed five 12-min running tests on a 400-m track on separate days: a preliminary trial, two trials after induction of EMF, and two trials without prior muscle fatigue. Tests with and without prior EMF were performed in an alternate order, randomly starting with either type. EMF was defined as a >or=20% drop in maximal expiratory mouth pressure achieved during expiratory resistive breathing against 50% maximal expiratory mouth pressure. The average distance covered in 12 min was significantly smaller during exercise with prior EMF compared to control exercise (2872+/-256 vs. 2957+/-325 m; P=0.002). Running speed was consistently lower (0.13 m s(-1)) throughout the entire 12 min of exercise with prior EMF. A significant correlation was observed between the level of EMF (decrement in maximal expiratory mouth pressure after resistive breathing) and the reduction in running distance (r2=0.528, P=0.007). Perceived respiratory exertion was higher during the first 800 m and heart rate was lower throughout the entire test of running with prior EMF compared to control exercise (5.3+/-1.6 vs. 4.5+/-1.7 points, P=0.002; 173+/-10 vs. 178+/-7 beats min(-1), P=0.005). We conclude that EMF impairs exercise performance as previously reported for IMF.
|Item Type:||Journal Article, refereed, original work|
|Communities & Collections:||04 Faculty of Medicine > Center for Integrative Human Physiology
04 Faculty of Medicine > Institute of Physiology
07 Faculty of Science > Institute of Physiology
|DDC:||570 Life sciences; biology
610 Medicine & health
|Deposited On:||20 Mar 2009 11:49|
|Last Modified:||27 Nov 2013 21:11|
|Citations:||Web of Science®. Times Cited: 14|
Scopus®. Citation Count: 16
Users (please log in): suggest update or correction for this item
Repository Staff Only: item control page