Comparison of Methods of Calculating Dynamic Strength Index.
In: International Journal of Sports Physiology & Performance, Jg. 13 (2018-03-01), Heft 3, S. 320-325
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Zugriff:
Purpose: To determine the reliability and variability of the Dynamic Strength Index (DSI) calculated from squat-jump (SJ) vs countermovement-jump (CMJ) peak force (PF) and to compare DSI values between methods. Methods: Male youth soccer and rugby league players (N = 27; age 17.2 ± 0.7 y, height 173.9 ± 5.7 cm, body mass 71.1 ± 7.2 kg) performed 3 trials of the SJ, CMJ, and isometric midthigh pull (IMTP) on 2 separate days. DSI was calculated by dividing the PF during each jump by the IMTP PF. Results: DSI-SJ exhibited moderate (intraclass correlation coefficient [ICC] = .419) within-session reliability and high variability (percentage coefficient of variation [%CV] = 15.91) during session 1; however, this improved noticeably during session 2 (ICC = .948, %CV = 4.03). In contrast, DSI-CMJ showed nearly perfect within-session reliability (ICC = .920-.952) and low variability (%CV = 3.80-4.57) for both sessions. Moreover, DSI-SJ values demonstrated a small yet significant increase between sessions (P = .01, d = 0.37), whereas only a trivial and nonsignificant increase was observed for DSI-CMJ between sessions (P = .796, d = 0.07). Between-sessions reliability was very high for the DSI-SJ (ICC = .741) and nearly perfect for the DSI-CMJ (ICC = .924). There was no significant or meaningful difference (P = .261, d = 0.12) between DSI-SJ (0.82 ± 0.18) and DSI-CMJ (0.84 ± 0.15). Conclusions: Practitioners should use DSI-CMJ, as it is a more reliable measure than DSI-SJ, although it produces similar ratios. [ABSTRACT FROM AUTHOR]
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Titel: |
Comparison of Methods of Calculating Dynamic Strength Index.
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Autor/in / Beteiligte Person: | Comfort, Paul ; Thomas, Christopher ; Dos'Santos, Thomas ; Jones, Paul A. ; Suchomel, Timothy J. ; McMahon, John J. |
Zeitschrift: | International Journal of Sports Physiology & Performance, Jg. 13 (2018-03-01), Heft 3, S. 320-325 |
Veröffentlichung: | 2018 |
Medientyp: | academicJournal |
ISSN: | 1555-0265 (print) |
DOI: | 10.1123/ijspp.2017-0255 |
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