ISSN: 1899-1955
Human Movement
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3/2020
vol. 21
 
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abstract:
Original paper

Single- versus multi-joint isometric protocols to induce a post activation potentiation effect on squat jump performance

Thyago Garcia
,
Juliano Dal Pupo
,
Débora Aparecida Knihs
,
Osvaldo André Furlaneto Rodrigues
,
Haiko Bruno Zimmermann
,
Johnny Padulo

Human Movement 2020 vol. 21 (3), 71-80
Online publish date: 2020/02/02
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Purpose
The objective of the study was to analyse the effects of post-activation potentiation induced by single- and multijoint maximal voluntary isometric contractions (MVIC) on squat jump performance.

Methods
Overall, 13 resistance-training males volunteered to participate in the study. Isometric knee extension exercise was chosen to represent single-joint MVIC (MVIC_SJ) and isometric squat to represent multi-joint MVIC (MVIC_MJ). Four experimental protocols were implemented in a randomized order on different days as follows: P1: squat jump performed before and 3 minutes after MVIC_MJ; P2: squat jump performed before and 7 minutes after MVIC_MJ; P3: squat jump performed before and 3 minutes after MVIC_SJ; P4: squat jump performed before and 7 minutes after MVIC_SJ. Jump height, mean power output, peak power output, net impulse, and electromyographic activity of lower limbs were analysed in squat jump before and after the interventions.

Results
ANOVA showed that peak power output increased in P1 (p = 0.04). No difference was found for electromyographic activity in any of the protocols.

Conclusions
We concluded that MVIC_MJ performed 3 minutes before the main task (P1) was more effective than MVIC_SJ in optimizing squat jump performance and that the changes in performance were unrelated to muscle activation.

keywords:

strength exercises, warm-up, power training, electromyography, biomechanics

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