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The Effect of Body Size on Countermovement Jump Kinetics in Children aged 7 to 11 years

Christopher Mark Jones, Melitta McNarry Orcid Logo, Nick John Owen, Nicholas Owen Orcid Logo

European Journal of Sport Science, Pages: 1 - 18

Swansea University Authors: Melitta McNarry Orcid Logo, Nicholas Owen Orcid Logo

Abstract

The purpose this study was to examine the effect of body size oncountermovement jump (CMJ)kinetics in children.Participants(n = 160) aged 7-11 years, divided equally by sex and into primary school year groups(years 3, 4, 5 and 6), each performedone CMJ on aforce platform. The variables bodyweight(BW...

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Published in: European Journal of Sport Science
ISSN: 1746-1391 1536-7290
Published: 2019
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa50193
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Abstract: The purpose this study was to examine the effect of body size oncountermovement jump (CMJ)kinetics in children.Participants(n = 160) aged 7-11 years, divided equally by sex and into primary school year groups(years 3, 4, 5 and 6), each performedone CMJ on aforce platform. The variables bodyweight(BW), peak force (Fmax), in-jump minimum force (IMF), in-jump vertical force range (IFR) and basic rate of force development (BRFD)wereattained from the force-time history and then subsequently scaled to account for body size. A significant age, sex and interaction effect werefound for theabsolutevariables BW, IMF, Fmaxand IFR (P < 0.05)between school year groups 3 and 4 against year’s 5 and 6. Simple main effects highlighted no significant sex differences between the boys and girls for all variables (P > 0.05). No significant age or sex differences were observed for normalised or allometrically scaled values(P > 0.05). The results indicate thatgirls and boys can be grouped together but that body size must be accounted for to enable accurate conclusions to be drawn independent of growth.Bodysizesignificantlyeffects the representation of CMJ kinetic results and therefore, future studies should report both absolute and scaled values.Future research should developan age-appropriate criterion method for children in order to determine processed CMJ variables to further investigate neuromuscular performance of children.
Keywords: Muscular power, Force platform, Children, Performance, Start time
College: College of Engineering
Start Page: 1
End Page: 18