Houlton, LJ, Moody, JA, Bampouras, TM and Esformes, JI Acute effects of intra-complex rest following back squats on vertical jump performance during complex training. Journal of Strength and Conditioning Research. ISSN 1064-8011 (Accepted)

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Abstract

Post-activation performance enhancement and complex-contrast sets are prevalent in sports science research. Typical complex-contrast sets consist of heavy back squats, an intra-contrast rest period (ICRP) and vertical jumps (countermovement jumps [CMJ], or squat jumps [SJ]). Propulsive impulse (Jprop) is considered the leading indicator of jump performance. However, studies evaluating jump performance during complex-contrast sets use jump height as the primary performance measure, limiting insight into ICRP's effect on jump performance. We assessed the effect of a three-repetition maximum (3RM) back squat and six ICRPs on vertical jump Jprop and associated force-time components. Fourteen participants completed 12 experimental conditions, assigned equally to four testing sessions. Independent variables, in a 6x2 randomised, counterbalanced design, were ICRP (0, 60, 120, 180, 240, 300 s; ICRP0, ICRP60, ICRP120, ICRP180, ICRP240, ICRP300, respectively) and vertical jump (CMJ and SJ). Conditions consisted of baseline vertical jumps, followed by three back squat repetitions at 100% 3RM, an ICRP and experimental jumps. Symmetrised percentage changes between experimental and baseline jumps were assessed using repeated measures ANOVA and pairwise effect sizes. Results showed significant effects (p ≤ 0.05) on CMJ average rate of force development (RFD) between ICRP0 and ICRP120 and ICRP0 and ICRP300. Pairwise comparisons showed medium and large effect sizes for and increases in CMJ RFD (g = 0.83-2.69) while SJ RFD decreased (g = 0.81-2.57). Small effect sizes were found for Jprop, peak force and mean force. Results suggest limited change in Jprop (g = 0.01-0.58) but back squats may potentiate RFD via the stretch-shortening cycle.

Item Type:	Article
Uncontrolled Keywords:	1106 Human Movement and Sports Sciences; 1116 Medical Physiology; Sport Sciences
Subjects:	R Medicine > RC Internal medicine > RC1200 Sports Medicine
Divisions:	Sport & Exercise Sciences
Publisher:	Lippincott, Williams & Wilkins
SWORD Depositor:	A Symplectic
Date Deposited:	17 May 2024 12:10
Last Modified:	17 May 2024 12:10
URI:	https://researchonline.ljmu.ac.uk/id/eprint/23293

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