TY  - THES
T1  - The effect of backpack load on the posture of children and its relationship to trunk muscle activity during walking on a treadmill
A1  - Babakhani,Farideh
Y1  - 2011/12/05
N2  - The investigation began during the spring of 2009. The subjects volunteered to participate from all across the state of Saarland through the Saarbrücker Zeitung. Of the total 76 subjects, 41 (23 girls and 18 boys) attended kindergarten while 35 (12 girls and 23 boys) attended the first grade in elementary school. Two subjects were tested every day over the course of nine weeks, starting April 11th 2009. Their weight is then measured and immediately 10, 20 and 30 % of their body weight is calculated to be used later during the treadmill walk.The investigation was made up of three parts: a questionnaire, EMG and video analysis of kinematic body posture.
With the increase of the backpack weight, the trunk inclination angle progressively increased and trunk motion range decreased linearly.With the increase of the backpack weight, the distance from the floor to the earlobe joint (height) decreased.With the weight of backpack at about 10 % and 20 % body weight (BW) step length increased and at 30 % BW decreased.
There was an increase of muscle activity in the upper trapezius at 20 % and 30 % BW as well as median power frequency at 30 % BW.This shows that there was no muscle fatigue in the upper body.With the increase of the backpack weight, the muscle activity of the thoracic erector spine at T12 and lumbar erector spinae at L3 decreased and median power frequency existed for all load conditions.There was muscle fatigue found in all load conditions in the thoracic erector spine at T12 and lumbar erector spinae at L3.
The mean weight of the backpack carried by children was 4.1 kg, which is around 16.7 % of their body weight.27.63 % of the children walked less than 1 km from their house door to kindergarten/school, 28.95 % walked approximately 1 km, and 43.42 % walked more than 1 km.
KW  - Schultasche
KW  - Haltung
KW  - Kind
KW  - Körperliche Belastung
KW  - Rumpfmuskulatur
KW  - Laufband
KW  - Elektromyographie
CY  - Saarbrücken
PB  - Universitäts- und Landesbibliothek
AD  - Postfach 151141, 66041 Saarbrücken
UR  - http://scidok.sulb.uni-saarland.de/volltexte/2011/4518
ER  -