Acute effect of intra-contrast rest redistribution within complex-contrast training set strategies on vertical jump propulsive force

Houlton, L, Moody, J, Bampouras, T ORCID: 0000-0002-8991-4655 and Esformes, J Acute effect of intra-contrast rest redistribution within complex-contrast training set strategies on vertical jump propulsive force. Journal of Strength and Conditioning Research. ISSN 1064-8011 (Accepted)

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Abstract

Complex-contrast training (CCT), whereby high load conditioning activities (CA) and low load explosive activities are alternated set-by-set, enhances explosive performance through post-activation performance enhancement (PAPE). However, intra-contrast rest periods (ICRP) typically required for PAPE to manifest are too lengthy in practice. This study therefore assessed the effect of rest redistribution (RR) of the ICRP on subsequent propulsive force application during countermovement jumps and squat jumps. Seventeen male subjects completed five interventions per jump type across five data collection sessions in a counterbalanced, cross-sectional design. Interventions consisted of five total contrast rest periods (TCRP; 60, 120, 180, 240, 300s). Each TCRP was defined as the sum of ICRP and RR. Thus TCRPs were partitioned as 30, 90, 150, 210, 270s ICRP respectively, and 30 s of redistributed rest, partitioned between CA repetitions. Within interventions, participants performed a control condition consisting of one set of vertical jumps (BASELINE), the assigned ICRP, then a second set of jumps (PRE-BS). This was followed by an experimental condition consisting of a high load CA (3RM back squats), performed with 15s between repetitions, followed by the ICRP, then a final set of jumps (POST-BS). Vertical jump propulsive impulse (JPROP) and related force-time components were assessed. Results showed no meaningful change in JPROP, suggesting overall jump performance was unaffected. However, increases in propulsion time, with POST-BS being higher than PRE-BS (g = 1.045, p < 0.001), and significant negative effects on rate of force development with POST-BS being lower than PRE-BS (g = 0.703, p = 0.009)suggest the combination of CCT and RR may negatively affect vertical jump propulsion strategies and limit PAPE manifestation. Practitioners may use RR to maintain vertical jump JPROP within CCT in time-limited scenarios, but should consider other CCT set configurations to enhance RFD.

Item Type:	Article
Uncontrolled Keywords:	1106 Human Movement and Sports Sciences; 1116 Medical Physiology; Sport Sciences; 3202 Clinical sciences; 3208 Medical physiology; 4207 Sports science and exercise
Subjects:	Q Science > QP Physiology R Medicine > RC Internal medicine > RC1200 Sports Medicine
Divisions:	Sport and Exercise Sciences
Publisher:	Lippincott, Williams & Wilkins
Date of acceptance:	18 December 2025
Date Deposited:	18 Dec 2025 14:35
Last Modified:	18 Dec 2025 14:35
URI:	https://researchonline.ljmu.ac.uk/id/eprint/27746

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