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dc.contributor.advisorButton, Chris
dc.contributor.advisorRoss, Angus
dc.contributor.advisorGibbons, Megan
dc.contributor.authorJacobs, Michael Benjamin
dc.date.available2013-08-18T20:49:24Z
dc.date.copyright2013
dc.identifier.citationJacobs, M. B. (2013). The effects of raising relative centre of mass height on maximal sprint performance. (Thesis, Master of Physical Education). University of Otago. Retrieved from http://hdl.handle.net/10523/4204en
dc.identifier.urihttp://hdl.handle.net/10523/4204
dc.description.abstractSprinting is the maximal velocity of bipedal locomotion via the horizontal displacement of a sprinter’s centre of mass (CoM). Few studies have investigated morphological properties in maximal velocity sprinting. While morphological properties are known to affect sprint mechanics, the influence of relative CoM height is presently unclear. The aim of this study was to identify how modifications to the location of CoM affected kinematic parameters during maximal velocity sprinting. Ten high performance athletes (age = 22.2 ± 3.13yr, weight = 89.5 ± 7.52kg, height = 183.3 ± 4.55cm, 35m sprint = 4.8 ± 0.19s, and leg length = 90.25 ± 4.18cm), from two sporting codes involving sprinting completed a series of maximal 35m sprints manipulated across three loading conditions: 1. Unloaded; 2. Weighted vest, raising relative CoM location by 3% of total body height; and 3. Weighted belt, using an identical load as condition 2 without change to CoM location. Free loaded squat jump was monitored as a covariate to negate for the effects of individualistic strength. Our results indicate that in comparison to unloaded conditions, increasing the CoM by 3% of total body height significantly (p<0.0003) decreased maximal velocity (7.45 ± 0.28m.s-1 and 7.21 ± 0.28m.s-1 respectively). Similarly, maximal velocity was significantly impaired (p<0.001) when additional mass was added around the CoM compared to the unloaded condition (7.24 ± 0.25m.s-1 and 7.45 ± 0.28m.s-1 respectively). Indirectly leg length was found to positively (p<0.024) correlate with maximal velocity by 0.01m.s-1 per 1cm increase in leg length. To date, no known empirical literature exists examining the manipulation of CoM within sprinters. Therefore it is not possible to draw comparisons with other research. However we can assume that additional mass, external or internal, decreases maximal velocity when located on or around the shoulders and waist. Our results suggest the location of CoM makes no practical difference that can be discerned in 35m sprint performance, which in effect is contradictory to the theoretical model constructed by Bejan and associates (2010) whereby raising CoM by 3% total body height improves maximal velocity.
dc.language.isoen
dc.publisherUniversity of Otago
dc.rightsAll items in OUR Archive are provided for private study and research purposes and are protected by copyright with all rights reserved unless otherwise indicated.
dc.subjectSprinting
dc.subjectCentre of Mass
dc.subjectSprint Kinematics
dc.subjectMaximal Velocity
dc.subjectMorphology
dc.titleThe effects of raising relative centre of mass height on maximal sprint performance.
dc.typeThesis
dc.date.updated2013-08-17T01:32:09Z
dc.language.rfc3066en
thesis.degree.disciplineDivision of Sciences
thesis.degree.nameMaster of Physical Education
thesis.degree.grantorUniversity of Otago
thesis.degree.levelMasters
otago.interloanno
otago.openaccessAbstract Only
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