The Acute Effects of Moderately Loaded Concentric-Only Quarter Squats on Vertical Jump Performance
Document Type
Journal Article
Keywords
Complex pairs, Postactivation potentiation, Power, Strength-power potentiating complexadolescent, adult, article, body posture, human, male, movement (physiology), muscle strength, physiology, resistance training, skeletal muscle, weight lifting, Adolescent, Adult, Humans, Male, Movement, Muscle Strength, Muscle, Skeletal, Posture, Resistance Training, Weight Lifting, Young Adult
Faculty
Faculty of Computing, Health and Science
School
School of Exercise and Health Sciences / Centre for Exercise and Sports Science Research
RAS ID
14314
Abstract
2012-Limited research exists examining the effect of moderately loaded conditioning activities that are employed as part of a strength-power potentiating complex (SPPC). Additionally, no studies to date have explored the effects of using a concentric-only quarter back squat protocol as part of an SPPC. Therefore, the purpose of this study was to examine the effects of a moderately loaded (50-65% of 1RM) concentric-only quarter back squat protocol on the occurrence of potentiation effects at various time points. Twenty men who could quarter back squat a minimum of 2.4 times their body mass (3.7 ±: 0.7 kg-per body mass) participated in this investigation. All subjects participated in 3 conditions: control (CT), a 50% of 1RM trial (50POT), and a 65% of 1RM trial (65POT). One minute before each condition, a maximal countermovement vertical jump (CMJ) was performed. One minute later, the subject performed 1 of 3 conditions: CT condition, 50POT, or 65POT, followed by vertical jumps at 0.5, 3, 5, 10, and 15 minutes after conditioning activity. A force plate was used to quantify displacement, peak power output, peak force, and the rate of force development for each CMJ. There were no significant differences (p> 0.05) in any of the performance measures quantified during the CMJ trials when comparing the CT, 50POT, and 65POT treatment conditions. However, 48% of the subjects demonstrated some degree of potentiation at the 30 seconds after completing the 65POT trial, but this percent increase was not statistically significant. From a practical perspective, if the goal of the SPPC is to create a maximization of the potentiation effect, moderately loaded activities may not be the best alternative.
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Comments
Crum, A., Kawamori, N., Stone, M., & Haff, G. G. (2012). The Acute Effects of Moderately Loaded Concentric-Only Quarter Squats on Vertical Jump Performance. Journal of Strength and Conditioning Research, 26(4), 914-925. Available here