Thesis
The effect of variable resistance training for the post activation performance enhancement of the countermovement jump
- Creator
- Rights statement
- Awarding institution
- University of Strathclyde
- Date of award
- 2022
- Thesis identifier
- T16366
- Person Identifier (Local)
- 202080377
- Qualification Level
- Qualification Name
- Department, School or Faculty
- Abstract
- Variable resistance training (VRT) is a modality with applications for sports performance training. It can be incorporated into established training methods for power development, with implications for training efficiency. Complex training has risen in popularity and application within the field of strength and conditioning. The supporting research to date has produced impractical and inconsistent conclusions around specific training prescriptions. Complex utilises the phenomenon of post-activation potentiation (PAP) to acutely enhance neuromuscular performance. This study investigated the effects of a heavy load barbell back squat with traditional resistance and VRT by steel chains on counter movement jump (CMJ) performance, specifically for jump height and positive net impulse. Twelve resistance-trained individuals volunteered to participate in three experimental trials. Completion of trials was randomised between the traditional, no-chain, and variable, chain, resistance modes. Participants performed 3 sets of 2 repetitions of each respective back squat at 85% one-repetition maximum (1RM); variable-resistance from chains amounted to an average of 20% total resistance. Jumps were performed at baseline and at 0.5, 2, 4.5, 8, 12.5, and at 18-minutes after the back squat conditioning activity. Results were analysed for changes in jump height and positive net impulse between exercise conditions and over the time course of recovery. Trivial effect sizes were found between exercise conditions (d < 0.20) with mean jump height 2.67% higher in chain than no-chains, with control trial 1.95% greater jump height than chain. Positive net impulse was 2.34 and 2.23% greater in chains than in other trials, respectively. These results show that a complex training set using variable resistance can acutely improve CMJ performance compared to using traditional, free-weight resistance alone or in the absence of a conditioning activity. Jump height was improved at 2 and 4.5 minutes from baseline in chains, whereas a decrease was observed with no-chains. This provides rationale for the use of variable resistance over traditional mode in this context. These time-points also provide a window of application in which practitioners could employ VRT to elicit a PAPE effect either within a complex set or prior to performance.
- Advisor / supervisor
- Childs, Craig
- Sykes, David
- Resource Type
- DOI
Relations
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PDF of thesis T16366 | 2022-10-19 | Public | Download |