Post-activation Potentiating Effects Of Unilateral And Bilateral Plyometric Warm-ups On Vertical Jump Performance.
Bibliographic record
Abstract
PURPOSE: Post-activation potentiation is a physiological phenomenon by which muscular performance is enhanced as a result of performing a voluntary pre-conditioning contraction. Maximal strength-based activities have been demonstrated to have a potentiating effect on vertical jump (VJ) performance, but maximal power-based activities have had varied effects in potentiating jumping performance. Part of this inconsistency may be the result of the level of loading of the power activity. The purpose of this study is to compare the effects of a unilateral or bilateral lower body plyometric warm-up on VJ performance. METHODS: Ten recreationally trained male subjects reported for testing on three separate days. Each treatment day was randomized to include either a control treatment (CON), unilateral plyometric warm-up (UL), or bilateral plyometric warm-up (BL). The plyometric warm-ups included 3 sets of 10 repetitions of unilateral or bilateral jumping activities. VJ performance was assessed pre-warm-up, and 1, 3, 5 and 7 minutes after the plyometric warm-up. Individual VJ measures were normalized to baseline and group means were compared using a multifactorial repeated measure ANOVA. RESULTS: VJ was significantly improved in the UL group at 1 (UL = 109.9±1.1%; BL=106.5±1.4%; CON=104.5±0.8%, p<0.05) and 3min (UL=110±1.4%; BL=105.8±1.6%; CON=104.5±1.5%, p<0.05) post-warm-up when compared to the BL and CON groups, while there was no significant difference at 5 (UL=108.2±1.6%; BL=105.1±1.5%; CON=101.5±0.8%, p>0.05) and 7min (UL=106.6±1.2%; BL=105.1±1.4%; CON=103.9±1.2%, p>0.05) testing intervals. There were no significant differences in VJ between BL and CON at any time point. Changes in VJ with UL warm-up were similar to previous studies that used a heavy resistance stimulus such as squats. CONCLUSION: Performing a series of unilateral plyometric warm-up activities may be an efficient method to enhance maximum vertical jump performance in recreationally trained males, and is superior to similar bilateral plyometric warm-ups for enhancing VJ performance.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.003 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".