Normalization of early isometric force production as a percentage of peak force during multijoint isometric assessment

Comfort, P ORCID: https://orcid.org/0000-0002-1131-8626, Dos’Santos, T, Jones, PA ORCID: https://orcid.org/0000-0002-3295-7670, McMahon, JJ ORCID: https://orcid.org/0000-0001-9952-7846, Suchomel, TJ, Bazyler, C and Stone, MH 2020, 'Normalization of early isometric force production as a percentage of peak force during multijoint isometric assessment' , International Journal of Sports Physiology and Performance, 15 (4) , pp. 478-482.

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Access Information: Accepted author manuscript version reprinted, by permission, from International Journal of Sports Physiology and Performance, 2020, 15 (4): pp.478-pp. 482, https://doi-org.salford.idm.oclc.org/10.1123/ijspp.2019-0217. © Human Kinetics, Inc.

Abstract

Purpose: To determine the reliability of early force production (50-, 100-, 150-, 200-, 250 ms) relative to peak force (PF) during an isometric mid-thigh pull (IMTP) and assess the relationships between these variables. Methods: Male collegiate athletes (n = 29; age: 21.1 ± 2.9 years; height: 1.71 ± 0.07 m; body mass: 71.3 ± 13.6 kg) performed IMTPs during two separate testing sessions. Net PF and net force produced at each epoch were calculated. Within- and between-session reliability were determined by using intraclass correlation coefficients (ICC) and coefficient of variation (CV%). Additionally, Pearson’s correlation coefficients and coefficient of determination, were calculated to examine the relationships between PF and time-specific force production. Results: Net PF and time-specific force demonstrated very high to almost perfect reliability both within- and between-sessions (ICCs 0.82-0.97; CV% 0.35-1.23%). Similarly, time-specific force expressed as a percentage of PF demonstrated very high to almost perfect reliability both within- and between-sessions (ICCs 0.76-0.86; CV% 0.32-2.51%). Strong to nearly perfect relationships (r = 0.615-0.881) exist between net PF and time-specific net force, with relationships improving over longer epochs. Conclusion: Based on the smallest detectable difference, a change in force at 50 ms expressed relative to PF >10% and early force production (100-, 150-, 200- and 250 ms) expressed relative to PF of >2% should be considered meaningful. Expressing early force production as a percentage of PF is reliable and may provide greater insight into the adaptations to the previous training phase than PF alone.

Item Type: Article
Schools: Schools > School of Health and Society > Centre for Health Sciences Research
Journal or Publication Title: International Journal of Sports Physiology and Performance
Publisher: Human Kinetics
ISSN: 1555-0265
Related URLs:
Depositing User: P Comfort
Date Deposited: 03 Jun 2020 13:20
Last Modified: 31 Jul 2020 08:01
URI: http://usir.salford.ac.uk/id/eprint/57155

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