Masters Thesis

Comparison of Deadlift Vs. Back Squat Postactivation Potentiation on Vertical Jump.

Strength coaches are searching for the best way to train their athletes to be bigger, faster, and stronger in order to increase performance. A unique form of power training is to try and invoke a postactivation potentiation (PAP). PAP is based on the premise of performing a heavy resistance exercise followed by a power exercise, resulting in increased power performance. Back squats (BS) are normally used, but a less researched tool is the hex bar deadlift. Therefore, the purpose of this study was to compare the potentiating effects of the back squat vs. HBDL on vertical jump performance. Ten resistance-trained men (age=22.15±2.66yrs, ht=178.10±7.20cm, mass=78.91±8.67kg) volunteered to participate and performed 3 pre countermovement jumps (CMJ) then 3 repetitions of BS or HBDL at 85% 1RM. To perform the CMJ, subjects jumped with arm swing on a force plate. The BS was performed with a standard barbell in a power rack with a safety squat device to insure a quad parallel position. The HBDL was performed using the low handles without straps. Following the BS or HBDL, subjects rested 8 minutes then performed 3 post CMJ. A control condition consisted of 3 pre CMJ, 8 minutes of standing rest, then 3 post CMJ. For jump height, there was an interaction of condition x time where the control and squat conditions resulted in a significant decrease in post vertical jump with no difference in deadlift. Manipulation of critical variables determines PAP outcomes. PAP is highly individualized and training experience of the subjects may have been too low to demonstrate increased performance.

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