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Degree Name

PhD (Doctor of Philosophy)

Program

Sport Physiology and Performance

Date of Award

8-2013

Committee Chair or Co-Chairs

Michael H. Stone

Committee Members

Michael H. Stone, Kimitake Sato, Michael W. Ramsey, Hugh S. Lamont

Abstract

The purpose of this study was to determine the differences in kinetic, kinematic, and metabolic variables between an acute normal dead stop squat (NDS) protocol and an acute accentuated eccentric loaded squat (AEL) protocol. Eight collegiate weightlifters were performed the 2 squat protocols. Eccentric and concentric kinetic and kinematic data were collected via synchronized force plate and linear position transducer. Metabolic parameters assessed were oxygen consumption (VO2 ) using open circuit spirometry, testosterone (T) and cortisol (C) via blood draw from antecubital vein, and lactate (La) values via finger prick blood draw. The following are major findings of the dissertation. No statistical differences were observed for concentric variables between AEL and NDS work sets or between warm-up at 55% (WUP55) and postset at 55% (POST55) sets. Differences were found in the speed and duration of the eccentric portion of the lifts. Results indicate that there are no meaningful biomechanical differences when performing AEL squats in this manner and that the intensity and volume executed did not result in PAP. Oxygen uptake was statistically different during sets with the additional eccentric load (set 4, 5, 6, 7) and the subsequent down set (set 9). Lactate was greater during AEL squatting than NDS after set 7 and set 8 for the whole group. T exhibited no statistically significant changes. C was greater immediately following the AEL protocol compared to NDS 30 minutes post-AEL squat protocol yielded a statistically significant difference from immediately post and a return to near baseline measures. These acute changes may have meaningful effects on long- term gains in hypertrophy and strength. The findings of this dissertation show the potential benefits of AEL dead-stop squats for long-term hypertrophy and strength development. However, because this dissertation was the first to explore dead-stop squats with an additional eccentric load, further research is required on both the potential benefits of dead-stop squats and typical squats with no dead-stop using an AEL protocol.

Document Type

Dissertation - restricted

Copyright

Copyright by the authors.

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