Sveistrup, H.,Vallis, Lori Ann.2009-03-232009-03-2319981998Source: Masters Abstracts International, Volume: 36-06, page: 1577.9780612284661http://hdl.handle.net/10393/8683http://dx.doi.org/10.20381/ruor-7431This study examined joint kinematics and muscle activation patterns produced by infants of different bouncing skill levels as they bounced in a Jolly Jumper harness system. The relationship between three components of bouncing was also determined. The three components were: (i) the oscillation pattern of the mass-spring system which can be characterized as a harmonic oscillator; (ii) the baby's contribution to the bouncing behaviour which can be characterized in part as a forcing function and in part as a harmonic oscillator; and (iii) the combination of these two components which corresponds to the output or the bouncing behaviour. Infants (N = 9) were instrumented with five surface electrodes over the lower leg muscles and dressed in black tights and a black long-sleeved body suit with reflective markers placed on the tights over seven body landmarks. Infants were then supported in a modified Jolly Jumper harness and encouraged to bounce. (Abstract shortened by UMI.)163 p.Health Sciences, Human Development.Thesis