Acute Responses of Muscle Activation during Eccentric Accentuated Loaded Squats and Normal Loaded Squats in Collegiate Weightlifters

<p>Introduction: Resistance training overloading the eccentric phase of exercises (termed accentuated eccentric loaded; AEL) has been hypothesized to optimize adaptations to force production and muscle mass via acute postactivation potentiation (PAP). Though enhancement of performance variables via AEL or PAP is equivocal in the literature, it is understood that AEL and/or PAP will result in either positive adaptations or a lack of maladaptations. Purpose: The purpose of this work was identifying any effect of AEL squats on measures of muscle activation in collegiate weightlifters. Subjects: Eight weightlifters (age = 24.63 ± 5.58 yrs; body mass = 83.39 ± 19.40 kg; height = 169.63 ± 8.68 cm; 1.91 ± 0.63 1RM:Body Mass) completed all testing sessions. Methods: Subjects completed AEL and NOR squat sessions being nearly identical to their normal scheduled training and sEMG data from the VM, VL, and BF muscles were collected during the entirety of each session. Statistics: Nested within RMANOVAs determined any session-long effect of AEL squats and paired samples t-tests determined any PAP on activation of the VM, VL, and BF. Results: Nonsignificant differences between the AEL CON and NOR CON phases on measures of muscle activation while trends to increase activation for all muscles were evident. There was also no evidence of PAP, identified by comparing identical sets within each session. Conclusions: There was no special effect of AEL squats on thigh musculature activation and no acute PAP was elucidated on activation levels.</p>

Name thesis:degree_name

PhD (Doctor of Philosophy)

Level thesis:degree_level

Dissertation - restricted

Discipline thesis:degree_discipline

Sport Physiology and Performance

Year dc:date.issued

2013

Author dc:creator

• MacDonald, Christopher J

• EMG
• Eccentric
• Strength
• Power
• Athletes
• Potentiation
• Squats
• Training
• Sports Sciences

Statement dc:rights

• Copyright by the authors.

Repository record dc:identifier

https://dc.etsu.edu/etd/1201

OAI identifier oai:identifier

oai:dc.etsu.edu:etd-2374