Comparison of the posture of school children carrying backpacks versus pulling them on trolleys
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Authors: Schmidt, J. and Docherty, S.
Journal: Clinical Chiropractic
Objective: To investigate whether there is a difference in the posture of school children walking with a backpack versus pulling a trolley. Design: Comparative, controlled, pilot trial. Setting: "Grundschule Fallersleben" - primary school in Germany. Subjects: Thirty-four school children between 6 and 8 years of age. Methods: Initially, neutral posture was measured in a standing position. All children were then asked to walk a predetermined route without intervention for approximately 7 min. This was followed by walking the same route with either a backpack (n= 19) or trolley (n= 15). Deviations from neutral of the thoracic and lumbar spine (flexion, extension, lateral flexion and rotation) from the final 30 s of the imaging sequences were taken and analysed. Results: Compared to unburdened walking, walking with a backpack led to a statistically significant (p≤ 0.05) increase in thoracic extension (3.91°, 95% CI. = 3.35-4.46) and right lumbar lateral flexion (2.29°, 95% CI. = -3.41 to -1.18), and a statistically significant decrease of lumbar flexion (2.2°, 95% CI. = 0.34-4.06). In contrast, walking with a trolley increased extension (1.4°, 95% CI. = 0.72-2.08), right lateral flexion (1.24°, 95% CI. = -1.91 to -0.57) and right rotation (3.09°, 95% CI. = -3.85 to -2.32) of the thoracic spine, and led to a statistically significant increase in left rotation (3.57°, 95% CI. = 2.58-4.55) of the lumbar spine. Comparing the backpack and trolley groups showed a statistically significant (p≤ 0.05) increase in thoracic extension and right lumbar lateral flexion in the backpack group. Posture during trolley pulling was characterized by a statistically significant (p≤ 0.05) increase in right thoracic and left lumbar rotation. Conclusion: Participants adopted asymmetric postures during walking with a backpack and pulling a trolley. However, the trolley group was characterised by spinal rotation which possibly adds an extra source of stress. This suggests that school children should use backpacks rather than trolleys when the weight is within recommended limits. © 2010 The College of Chiropractors.