Journal article
The Effects of Low-Load Squat Jump and Maximal Isometric Priming Exercise on Muscular Performance and Perceptual State
Journal of Strength and Conditioning Research, Vol.38(1), pp.1-9
2024
PMID: 38085618
Abstract
The aim of this study was to examine responses at 3 and 27 hours after low-load jump squat (LL) and maximal isometric half-squat (ISO) priming stimuli. Fifteen resistance-trained males performed LL (4 × 3 at 20% 1 repetition maximum [1RM]), ISO (4 × 3 seconds), and control (CON) activities (standardized warm-up) in a randomized and counterbalanced order. Countermovement jump (CMJ) and isometric midthigh pull tests were conducted to assess performance changes after priming and CON activities. No clear changes in CMJ measures were found after priming activities compared with CON. However, small effect size improvements were found after priming stimuli completed on the same day. A 2.9% decrease in concentric phase duration (CI = 0.3-5.9, p = 0.333, Cliff's delta = -0.156) and a 9.1% increase in RSImod (CI = 0.2-12.3, p = 0.151, Cliff's delta = -0.218) occurred at 3 hours after LL compared with CON. Braking phase duration (CI = 0.8-10.6, p = 0.333, Cliff's delta = -0.213) was 2.9% shorter at 3 hours after ISO compared with CON. No clear changes in isometric peak force occurred after priming activities compared with CON. Additionally, questionnaires were completed to assess perceptual state and perceived effectiveness of the priming stimulus to influence performance. An increase in the "effect of activity" was perceived at 3 hours after LL and ISO (p = 0.013-0.044, Cliff's delta = 0.578-0.6) and at 27 hours after ISO (p = 0.99, Cliff's delta = 0.173) compared with CON. An increase in "muscular heaviness" was also reported at 3 hours after ISO compared with CON (p = 0.199, Cliff's delta = 0.320). The collective findings suggest limited benefits over the day after LL and ISO priming stimuli. However, as there was substantial variation in individual responses, the relative nature of priming responses should be considered when prescribing similar strategies in practical environments.
Details
- Title
- The Effects of Low-Load Squat Jump and Maximal Isometric Priming Exercise on Muscular Performance and Perceptual State
- Authors
- Peter W Harrison (Author) - University of QueenslandLachlan P James (Author) - La Trobe UniversityDavid G Jenkins (Author) - University of the Sunshine Coast, Queensland, School of Health - Sports & Exercise ScienceMichael R McGuigan (Author) - Auckland University of TechnologyPatrick M Holmberg (Author) - Queensland University of TechnologyVincent G Kelly (Corresponding Author) - Queensland University of Technology
- Publication details
- Journal of Strength and Conditioning Research, Vol.38(1), pp.1-9
- Publisher
- Lippincott Williams & Wilkins
- DOI
- 10.1519/JSC.0000000000004524
- ISSN
- 1533-4287
- PMID
- 38085618
- Organisation Unit
- School of Health - Sports & Exercise Science
- Language
- English
- Record Identifier
- 99991498602621
- Output Type
- Journal article
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