| Effect of Carrying Two Types of Pack in Two Heights of Placement (Lumbar and Thoracic) on Some of Kinematic Variables of Primary Schoolboys |
| Paper ID : 1157-SSRC-13TH |
| Authors |
|
Aliakbar Jadidian *1, Mohamad Hosein Alizade2, Elham Shirzad2, Fateme Ahmadi Godini3 1Payame Noor University (PNU), P.O.Box 19395-4697, Tehran, Iran 2Department of Health and Sport Medicine, Faculty of Physical Education and Sport Sciences, university of Tehran, Tehran, Iran 3Department of Biomechanics and Sports Injuries, faculty of Physical Education and Sports Sciences, Mazandaran University, Mazandaran, Iran. |
| Abstract |
| Introduction: Schoolchildren load carriage have so many challenges. Height of placement of packs is one of them, particularly in relation to kinematic and postural variables. The aim of this study was investigating the effect of carrying backpack and modified pack (with three bags that distribute the load equally in front and back of trunk) with 10 percent of body weight, in two heights of placement including lumbar and thoracic, on craniovertebral angle, trunk angle, and the angle of hip and knee joints among 8 – 11 years old schoolboys. Materials and methods: 27 schoolboys participated in the study after considering inclusion and exclusion criteria, and fulfilled five tasks including walking without pack, carrying backpack on lumbar area, backpack on thoracic area, modified pack on lumbar area and modified pack on thoracic area, while photogrammetry of right side was done by a Panasonic camera. Target angles were measured single-blinded with Kinovea motion analysis software. The angles of each variable was measured in three phases of gait including hill-strike, mid-stance, and toe-off, then the average was calculated for data analysis by SPSS software. Repeated measure ANOVA was used to compare tasks. Results: Results showed significant decrease in craniovertebral angle (increased forward head posture) in the task of carrying backpack on thoracic in contrast with lumbar area, and increase in trunk forward lean while carrying both packs (p<0/05) that was significantly more in tasks of backpack (p<0/05). But in craniovertebral angle, significant difference was not seen while carrying modified pack in contrast with control (p>0/05). Conclusion: Carrying pack on lumbar area caused lesser postural variations, thus seems better. Changing position of the load concentrated on the back, can more affect the kinematic parameters of schoolboys. The higher placement of the concentrated load’s center of mass (top of back), may cause compensation in head position (forward head), to maintain combined center of mass on base of support. The modified pack carriage only caused a little trunk forward lean which was lesser than that of backpack. These results, however, are limited to immediately changes, with 10 percent weight on even surface. |
| Keywords |
| backpack, gait, kinematics, pack position, posture, schoolchildren |
| Status: Abstract Accepted (Oral Presentation) |
