The effects of raising relative centre of mass height on maximal sprint performance.
|dc.contributor.author||Jacobs, Michael Benjamin|
|dc.identifier.citation||Jacobs, 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/10523/4204||en|
|dc.description.abstract||Sprinting 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.publisher||University of Otago|
|dc.rights||All 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.subject||Centre of Mass|
|dc.title||The effects of raising relative centre of mass height on maximal sprint performance.|
|thesis.degree.discipline||Division of Sciences|
|thesis.degree.name||Master of Physical Education|
|thesis.degree.grantor||University of Otago|
Files in this item
There are no files associated with this item.
This item is not available in full-text via OUR Archive.
If you are the author of this item, please contact us if you wish to discuss making the full text publicly available.