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dc.contributor.authorPantoja, Patrícia Diaspt_BR
dc.contributor.authorCarvalho, Alberito Rodrigo dept_BR
dc.contributor.authorRibas, Leonardo Rossatopt_BR
dc.contributor.authorPeyré-Tartaruga, Leonardo Alexandrept_BR
dc.date.accessioned2018-12-05T02:44:01Zpt_BR
dc.date.issued2018pt_BR
dc.identifier.issn1932-6203pt_BR
dc.identifier.urihttp://hdl.handle.net/10183/185895pt_BR
dc.description.abstractThis study aimed to compare the components of force-velocity (F-V) and power-velocity (P- V) profiles and the mechanical effectiveness of force application (or force ratio–RF) among various sled-towing loads during the entire acceleration phase of a weighted sled sprint. Eighteen sprinters performed four 50-m sprints in various conditions: unloaded; with a load corresponding to 20% of the athlete’s body mass (BM); with a load of 30% BM; and with a load of 40% BM. Data were collected with five video cameras, and the images were digitised to obtain velocity from the derivation of the centre-of-mass position. F-V and P-V compo- nents and RF were estimated from sprinting velocity-time data for each load using a vali- dated method that is based on an inverse dynamic approach applied to the sprinter’s centre- of-mass (it models the horizontal antero-posterior and vertical ground reaction force compo- nents) and requires only measurement of anthropometric and spatiotemporal variables (body mass, stature and instantaneous position or velocity during the acceleration phase). The theoretical maximal velocity decreased with load compared with the unloaded condition (for 20% BM: -6%, effect size (ES) = 0,38; for 30% BM: -15%, ES = 1.02; for 40% BM: -18%, ES = 1.10). The theoretical maximal horizontal force (F0) and maximal power were not dif- ferent among conditions. However, power at the end of the acceleration phase increased with load (40% BM vs 0%: 72%; ES = 2.73) as well as the maximal mechanical effectiveness (12%; ES = 0.85). The linear decrease in RF was different between 30 or 40% BM and the unloaded condition (-23%; ES = 0.74 and 0.66). Better effectiveness may be developed with 40% BM load at the beginning of the acceleration and with the various load-induced changes in the components of the F-V and P-V relationships, allowing a more accurate determination of optimal loading conditions for maximizing power.en
dc.format.mimetypeapplication/pdfpt_BR
dc.language.isoengpt_BR
dc.relation.ispartofPlos One. San Francisco. Vol. 13, no. 10 (Oct. 2018), e0204473, 12 p.pt_BR
dc.rightsOpen Accessen
dc.subjectCorridapt_BR
dc.subjectDesempenho atléticopt_BR
dc.subjectAtletaspt_BR
dc.titleEffect of weighted sled towing on sprinting effectiveness, power and force-velocity relationshippt_BR
dc.typeArtigo de periódicopt_BR
dc.identifier.nrb001080459pt_BR
dc.type.originEstrangeiropt_BR


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