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- Title
Anchor Scheme, Intensity, and Time to Task Failure do not Influence Performance Fatigability or Changes in Neuromuscular Responses following Bilateral Leg Extensions.
- Authors
Keller, Joshua L.; Housh, Terry J.; Anders, John Paul V.; Neltner, Tyler J.; Schmidt, Richard J.; Johnson, Glen O.
- Abstract
The aim of this study was to examine performance fatigability and neuromuscular responses following sustained, bilateral, isometric, leg extensions anchored to RPEs and forces. Fifteen men completed three sustained leg extensions anchored to RPEs and three anchored to forces corresponding to the RPE values. The subjects completed pretest and posttest MVICs to quantify performance fatigability and changes in muscle excitation (electromyographic amplitude [EMG AMP]) and muscle fiber action potential conduction velocity (CV; EMG mean power frequency [MPF]). Repeated measures ANOVAs were used to assess the mean differences in performance fatigability, neuromuscular responses, initial EMG AMP, and time to task failure (TTF). Collapsed across Anchor, Intensity, and Condition, performance fatigability was 13.1 ± 10.3%. There was no significant (P=0.902) change in EMG AMP, but EMG MPF decreased significantly (P=0.003) from pretest (88.9 ± 21.1 Hz) to posttest (81.8 ± 18.4 Hz). The initial EMG AMP values suggested an intensity-related increase (P<0.001) in engaged muscle; whereas, TTF decreased (P<0.001) with increased intensity. These findings suggested performance fatigability was not influenced by anchor scheme, the amount of engaged muscle, intensity, or TTF, and may be related to a sensory tolerance limit.
- Subjects
LEG; ANCHORS; PERFORMANCES
- Publication
Journal of Exercise Physiology Online, 2020, Vol 23, Issue 4, p119
- ISSN
1097-9751
- Publication type
Article