The effects of eccentric phase duration on concentric outcomes in the back squat and bench press in well-trained males

The velocity and magnitude in which the eccentric phase of an exercise is completed directly affects performance during the concentric phase. Therefore, the purpose of this research was to investigate the effects of eccentric phase duration on concentric outcomes at 60% and 80% of one-repetition max...

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Bibliographic Details
Published in:Journal of sports sciences 2019-12, Vol.37 (23), p.2676-2684
Main Authors: Carzoli, Joseph P., Sousa, Colby A., Belcher, Daniel J., Helms, Eric R., Khamoui, Andy V., Whitehurst, Michael, Zourdos, Michael C.
Format: Article
Language:English
Subjects:
Biomechanical Phenomena
Humans
Male
Males
Motion detection
movement biomechanics
Muscle, Skeletal - physiology
Perception - physiology
Physical Exertion - physiology
Resistance training
Resistance Training - methods
Strength training
Velocity
Weight Lifting - physiology
Young Adult
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Summary:The velocity and magnitude in which the eccentric phase of an exercise is completed directly affects performance during the concentric phase. Therefore, the purpose of this research was to investigate the effects of eccentric phase duration on concentric outcomes at 60% and 80% of one-repetition maximum (1RM) in the squat and bench press. Sixteen college-aged, resistance-trained males completed 1RM testing, established normative eccentric durations, and performed fast (0.75 times normative) and slow (2.0 times normative) metronome-controlled eccentric duration repetitions. Outcome measures assessed during the concentric phase were: average concentric velocity (ACV), peak concentric velocity (PCV), rating of perceived exertion (RPE), range of motion (ROM), and barbell path. Eccentric duration was significantly and inversely correlated with ACV at 60% (r = −0.408, p = 0.004) and 80% (r = −0.477, p = 0.001) of 1RM squat. At 60% of 1RM squat, both fast and slow eccentric conditions produced greater (p 
ISSN:0264-0414
1466-447X
DOI:10.1080/02640414.2019.1655131