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Reliability of the dynamic strength index in college athletes

Thomas, C; Jones, PA; Comfort, P

Authors

C Thomas



Abstract

Purpose: To determine the reliability of the Dynamic Strength Index (DSI) in college athletes. Method: Nineteen male college athletes performed the squat jump (SJ) and isometric midthigh pull (IMTP) to determine peak force, on 2 separate days. Reliability was assessed by intraclass correlation coefficient (ICC), typical error (TE), percentage change in the mean, smallest worthwhile change (SWC), and coefficient of variation (%CV). Results: Peak force for the SJ was 2137 ± 499 N and 2781 ± 435 N for the IMTP, resulting in a mean DSI of 0.78 ± 0.19. Peak forces in the SJ (ICC = .99, TE = 57.22 N, change in mean = 0.2%, SWC = 4.7%, CV = 2.6%) and IMTP (ICC = .95, TE = 104.22 N, change in mean = 0.5%, SWC = 3.1%, CV = 3.8%) were considered highly reliable between sessions. However, IMTP peak force was the only variable with an overall TE. Conclusion: This study demonstrates that peak force in the SJ and IMTP are reliable, resulting in a reliable assessment of dynamic-force-production capabilities via the DSI. The DSI may be used to guide individualized training interventions and monitor specific adaptations to training. Changes in SJ peak force, IMTP peak force, and DSI were >4.67%, 3.13%, and 5.13%, respectively, identifying meaningful changes in response to training or competition.

Citation

Thomas, C., Jones, P., & Comfort, P. (2015). Reliability of the dynamic strength index in college athletes. International Journal of Sports Physiology and Performance, 10(5), 542-545. https://doi.org/10.1123/ijspp.2014-0255

Journal Article Type Article
Publication Date Jul 1, 2015
Deposit Date Oct 26, 2015
Journal International Journal of Sports Physiology and Performance
Print ISSN 1555-0265
Publisher Human Kinetics
Volume 10
Issue 5
Pages 542-545
DOI https://doi.org/10.1123/ijspp.2014-0255
Publisher URL http://dx.doi.org/10.1123/ijspp.2014-0255
Related Public URLs http://journals.humankinetics.com/ijspp




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