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  • 1.
    Eriksson, Martin
    et al.
    KTH, School of Technology and Health (STH), Medical Engineering.
    Halvorsen, Kjartan A.
    KTH, School of Technology and Health (STH), Medical Engineering.
    Gullstrand, Lennart
    Immediate effect of visual and auditory feedback to control the running mechanics of well-trained athletes2011In: Journal of Sports Sciences, ISSN 0264-0414, E-ISSN 1466-447X, Vol. 29, no 3, p. 253-262Article in journal (Refereed)
    Abstract [en]

    The correlation between mechanical factors of running and running economy as measured by metabolic cost is a subject of much interest in the study of locomotion. However, no change in running technique has been shown to result in an immediate improvement in running economy on an intra-individual basis. To evaluate the effect of a modified running technique, it is probably necessary that the individual trains with the new technique for a longer period using a feedback system to control the new kinematics. In this study, we examine the feasibility of using visual and auditory feedback to adapt running technique according to a simplistic model of the mechanical cost of running. The model considers only the mechanical work against gravity, which is the product of the magnitude of the vertical displacement of the runner's centre of mass and the step-frequency. In the experiments reported here, 18 trained runners, running at 16km center dot h-1 on a treadmill, were given feedback on these parameters together with indicated target levels. In almost all cases, the runners were able to adjust their technique accordingly.

  • 2.
    Sandamas, Paul
    et al.
    Swedish Sch Sport & Hlth Sci, GIH, Lidingovagen 1, S-11433 Stockholm, Sweden..
    Gutierrez-Farewik, Elena
    KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, BioMEx. Karolinska Inst, Stockholm, Sweden..
    Arndt, Anton
    Swedish Sch Sport & Hlth Sci, GIH, Lidingovagen 1, S-11433 Stockholm, Sweden.;Karolinska Inst, Stockholm, Sweden..
    The effect of a reduced first step width on starting block and first stance power and impulses during an athletic sprint start2019In: Journal of Sports Sciences, ISSN 0264-0414, E-ISSN 1466-447X, Vol. 37, no 9, p. 1046-1054Article in journal (Refereed)
    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.

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