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The effect of a reduced first step width on starting block and first stance power and impulses during an athletic sprint start
Swedish Sch Sport & Hlth Sci, GIH, Lidingovagen 1, S-11433 Stockholm, Sweden..
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, BioMEx. Karolinska Inst, Stockholm, Sweden..ORCID iD: 0000-0001-5417-5939
Swedish Sch Sport & Hlth Sci, GIH, Lidingovagen 1, S-11433 Stockholm, Sweden.;Karolinska Inst, Stockholm, Sweden..
2019 (English)In: Journal of Sports Sciences, ISSN 0264-0414, E-ISSN 1466-447X, Vol. 37, no 9, p. 1046-1054Article in journal (Refereed) Published
Abstract [en]

This study investigated how manipulating first step width affects 3D external force production, centre of mass (CoM) motion and performance in athletic sprinting. Eight male and 2 female competitive sprinters (100m PB: 11.03 +/- 0.36 s male and 11.6 +/- 0.45 s female) performed 10 maximal effort block starts. External force and three-dimensional kinematics were recorded in both the block and first stance phases. Five trials were performed with the athletes performing their preferred technique (Skating) and five trials with the athletes running inside a 0.3 m lane (Narrow). By reducing step width from a mean of 0.31 +/- 0.06 m (Skating) to 0.19 +/- 0.03 m (Narrow), reductions were found between the two styles in medial block and medial 1st stance impulses, 1st stance anterior toe-off velocity and mediolateral motion of the CoM. No differences were found in block time, step length, stance time, average net resultant force vector, net anteroposterior impulse nor normalised external power. Step width correlated positively with medial impulse but not with braking nor net anteroposterior impulse. Despite less medially directed forces and less mediolateral motion of the CoM in the Narrow trials, no immediate improvement to performance was found by restricting step width.

Place, publisher, year, edition, pages
TAYLOR & FRANCIS LTD , 2019. Vol. 37, no 9, p. 1046-1054
Keywords [en]
Sprinting, foot placement, CoM motion, impulse, external power
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-249768DOI: 10.1080/02640414.2018.1541161ISI: 000463112500011PubMedID: 30460879Scopus ID: 2-s2.0-85057296756OAI: oai:DiVA.org:kth-249768DiVA, id: diva2:1307654
Note

QC 20190429

Available from: 2019-04-29 Created: 2019-04-29 Last updated: 2019-04-29Bibliographically approved

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Gutierrez-Farewik, Elena

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