Impulse-Based Dynamic Strength Index: Considering Time-Dependent Force Expression.
The dynamic strength index (DSI) is a useful tool to assess an athlete's capacity to effectively use maximum strength during dynamic tasks. Although DSI is traditionally calculated based on peak forces, the ability to express force over time (i.e., impulse) is a better predictor of dynamic performan...
| Publicado en: | Journal of Strength & Conditioning Research Vol. 35; no. 5; pp. 1177 - 1182 |
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| Autores principales: | , , , |
| Formato: | equations & formulas research tables/charts Journal Article |
| Publicado: |
Lippincott Williams & Wilkins
May2021
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=150584402&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 150584402 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 10648011 JSC jtl: Journal of Strength & Conditioning Research issn: 10648011 maglogo: N pubinfo: dt: May2021 vid: 35 iid: 5 pid: 5086 pub: Lippincott Williams & Wilkins place: Baltimore, Maryland artinfo: ui: 150584402 150584402 150584402 10.1519/jsc.0000000000004032 150584402 ppf: 1177 ppct: 5 formats: tig: atl: Impulse-Based Dynamic Strength Index: Considering Time-Dependent Force Expression. aug: au: Haischer, Michael H. Krzyszkowski, John Roche, Stuart Kipp, Kristof affil: Department of Physical Therapy, Marquette University, Milwaukee, Wisconsin sug: subj: Muscle Strength Biomechanics Ground Reaction Force Exercise Test, Muscular Methods Exercise Intensity Task Performance and Analysis Human Athletes, Female Athletes, College Racquet Sports Athletic Performance Jumping Isometric Contraction ab: The dynamic strength index (DSI) is a useful tool to assess an athlete's capacity to effectively use maximum strength during dynamic tasks. Although DSI is traditionally calculated based on peak forces, the ability to express force over time (i.e., impulse) is a better predictor of dynamic performance. The purpose of this study was to investigate the association between DSI calculated based on peak force (fDSI) and impulse (iDSI). Nineteen female collegiate lacrosse players performed countermovement jumps (CMJs) and isometric midthigh pulls (IMTPs). Peak force and impulse were extracted from CMJ and IMTP force-time data. Countermovement jump impulse was calculated by integrating force over the concentric movement time, whereas IMTP impulse was calculated by integrating force over the CMJ-matched movement time. Ratios between CMJ and IMTP peak force and impulse were used to calculate fDSI and iDSI, respectively. A moderate positive correlation existed between iDSI and fDSI (r = 0.644 [0.283-0.840], p = 0.003). Based on thresholds established in the literature, the 2 indices suggest conflicting training recommendations for 37% of athletes. Because impulse is a better predictor of dynamic performance, iDSI may represent a more valid method for assessing an athlete's capacity to effectively use maximum strength during dynamic tasks. Practitioners and researchers may want to consider augmenting current training and research practices with an impulse-based DSI. pubtype: Academic Journal doctype: equations & formulas research tables/charts Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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