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Locomotor and diaphragm muscle fatigue in endurance athletes performing time-trials of different durations


Wüthrich, Thomas U; Eberle, Elisabeth C; Spengler, Christina M (2014). Locomotor and diaphragm muscle fatigue in endurance athletes performing time-trials of different durations. European Journal of Applied Physiology, 114(8):1619-1633.

Abstract

Purpose: Fatigue in leg muscles might differ between running and cycling due to inherent differences in muscle activation patterns. Moreover, postural demand placed upon the diaphragm during running could augment the development of diaphragm fatigue. Methods: We investigated quadriceps and diaphragm fatigue in 11 runners and 11 cyclists (age: 29±5years; $\dot{V}$ O2,peak: 66.9±5.5mlmin−1kg−1) by assessing quadriceps twitch force (Q tw) and transdiaphragmatic twitch pressure (P di,tw) before and after 15- and 30-min time-trials (15TT, 30TT). Inspiratory muscle fatigue was also obtained after volitional normocapnic hyperpnoea (NH) where postural demand is negligible. We hypothesized that running and cycling would induce different patterns of fatigue and that runners would develop less respiratory muscle fatigue when performing NH. Results: The reduction in Q tw was greater in cyclists (32±6%) compared to runners (13±8%, p<0.01), but not different for 15TTs (23±13%) and 30TTs (21±11%, p=0.34). Overall P di,tw was more reduced after 15TTs (24±8%) than after 30TTs (20±9%, p=0.04) while being similar for runners and cyclists (p=0.78). Meanwhile, breathing duration in NH and the magnitude of inspiratory muscle fatigue were also not different (both p>0.05). Conclusion: Different levels of leg muscle fatigue in runners and cyclists could in part be related to the specific muscle activation patterns including concentric contractions in both modalities but eccentric contractions in runners only. Diaphragm fatigue likely resulted from the large ventilatory load which is characteristic for both exercise modalities and which was higher in 15TTs than in 30TTs (+27%, p<0.01) while postural demand appears to be of less importance.

Abstract

Purpose: Fatigue in leg muscles might differ between running and cycling due to inherent differences in muscle activation patterns. Moreover, postural demand placed upon the diaphragm during running could augment the development of diaphragm fatigue. Methods: We investigated quadriceps and diaphragm fatigue in 11 runners and 11 cyclists (age: 29±5years; $\dot{V}$ O2,peak: 66.9±5.5mlmin−1kg−1) by assessing quadriceps twitch force (Q tw) and transdiaphragmatic twitch pressure (P di,tw) before and after 15- and 30-min time-trials (15TT, 30TT). Inspiratory muscle fatigue was also obtained after volitional normocapnic hyperpnoea (NH) where postural demand is negligible. We hypothesized that running and cycling would induce different patterns of fatigue and that runners would develop less respiratory muscle fatigue when performing NH. Results: The reduction in Q tw was greater in cyclists (32±6%) compared to runners (13±8%, p<0.01), but not different for 15TTs (23±13%) and 30TTs (21±11%, p=0.34). Overall P di,tw was more reduced after 15TTs (24±8%) than after 30TTs (20±9%, p=0.04) while being similar for runners and cyclists (p=0.78). Meanwhile, breathing duration in NH and the magnitude of inspiratory muscle fatigue were also not different (both p>0.05). Conclusion: Different levels of leg muscle fatigue in runners and cyclists could in part be related to the specific muscle activation patterns including concentric contractions in both modalities but eccentric contractions in runners only. Diaphragm fatigue likely resulted from the large ventilatory load which is characteristic for both exercise modalities and which was higher in 15TTs than in 30TTs (+27%, p<0.01) while postural demand appears to be of less importance.

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Item Type:Journal Article, refereed, original work
Communities & Collections:National licences > 142-005
Dewey Decimal Classification:570 Life sciences; biology
610 Medicine & health
Scopus Subject Areas:Health Sciences > Orthopedics and Sports Medicine
Health Sciences > Public Health, Environmental and Occupational Health
Health Sciences > Physiology (medical)
Uncontrolled Keywords:Public Health, Environmental and Occupational Health, Physiology (medical), Orthopedics and Sports Medicine, General Medicine
Language:English
Date:1 August 2014
Deposited On:07 Aug 2019 07:37
Last Modified:15 Apr 2021 15:07
Publisher:Springer
ISSN:1439-6319
OA Status:Green
Publisher DOI:https://doi.org/10.1007/s00421-014-2889-7

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