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Journal article
Reliability and validity of free-weight countermovement jumps to characterize force-velocity-power profiles
European journal of sport science, Vol.24(4), pp.422-430
2024
Abstract
The aim of this study was to determine test-retest reliability and concurrent validity of vertical force-velocity-power (FVP) profiles using Smith machine and free-weight countermovement jumps (CMJs). A repeated-measure cross-over design with randomized load order and counterbalanced trials was employed. Sixteen resistance-trained males (age: 26.4 ± 3.9 years, height: 179.6 ± 8.1 cm, body mass: 84.5 ± 10.8 kg) performed maximal loaded CMJs with 4–50 kg on six occasions, with three trials utilizing a Smith machine and three utilizing free-weights. Jump height was estimated with a linear-position transducer, and the Samozino computation method estimated theoretical maximal jump parameters. Reliability and concurrent validity were determined for jump height for each jump load and estimated theoretical maximal jump parameters using estimates of bias (mean difference, 95% limits of agreement) and agreement (intraclass correlation coefficients, ICCs). The jump height and maximum theoretical power demonstrated good-to-excellent reliability between sessions for both methods (ICC: 0.872–0.947) and concurrent validity between methods (ICC: 0.885–0.969). However, reliability for theoretical maximal force, velocity, and force-velocity gradient was not as high using either method (ICC = 0.320–0.615) and concurrent validity was poor (ICC: 0.122–0.340). In summary, using both jump methods, a linear-position transducer provides reliable jump height and theoretical maximal power values. However, our data do not support the reliability or validity of FV relationships using linear position transducers.
Highlights
• Countermovement jump (CMJ) height can be reliably assessed with a linear-position transducer when adding mass (4–50 kg) with either a Smith machine or free-weights.
• Theoretical maximum force, velocity, and force-velocity gradients derived from the Smith machine and free-weights are neither reliable, nor consistent between methods.
• Smith machine and free-weight CMJ methods cannot be used interchangeably to develop force-velocity-power profiles with a linear position transducer.
Details
- Title
- Reliability and validity of free-weight countermovement jumps to characterize force-velocity-power profiles
- Authors/Creators
- Andrew M. Jonson - Swinburne University of TechnologyOlivier Girard - The University of Western AustraliaBradley A. Wall - Murdoch UniversityThomas P. Walden - University Health NetworkPaul S. R. Goods - Murdoch University, Centre for Healthy AgeingBrook Galna - Murdoch University, Centre for Healthy AgeingBrendan R. Scott - Murdoch University, Centre for Healthy Ageing
- Publication Details
- European journal of sport science, Vol.24(4), pp.422-430
- Publisher
- Wiley
- Number of pages
- 9
- Identifiers
- 991005649567107891
- Copyright
- © 2024 The Authors.
- Murdoch Affiliation
- Centre for Healthy Ageing; Murdoch Applied Sports Science Laboratory
- Language
- English
- Resource Type
- Journal article
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- 1 Clinical & Life Sciences
- 1.172 Sports Science
- 1.172.414 Training Optimization
- Web Of Science research areas
- Sport Sciences
- ESI research areas
- Clinical Medicine