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. 2018 Mar 21;13(3):e0193648.
doi: 10.1371/journal.pone.0193648. eCollection 2018.

Effects of backpack load and position on body strains in male schoolchildren while walking

Yi-Lang Chen  1   2 , Ying-Cen Mu  1
Affiliations

Effects of backpack load and position on body strains in male schoolchildren while walking

Yi-Lang Chen et al. PLoS One. .

Abstract

Data regarding the effects of backpack carriage on children's body strains while walking are limited. This study measured the body posture, muscle activation, and subjective discomfort scores of 12 male schoolchildren (age: 12.3 (range 12.1-13.0) y, height: 151.3 (range 144.2-154.6) cm, weight: 46.6 (range 43.6-49.7) kg) carrying backpacks weighing 5%, 10%, and 15% of their respective body weights (BWs) and walking for 10 min on a treadmill. For each load, three positions along the spinal column (T7, T12, and L3) were examined. Participants carrying a backpack weighing 15% of BW exhibited higher head flexion, trunk flexion, and corresponding muscle activation, and a lower lumbosacral angle compared with those carrying loads of 5% and 10% of BW. The waist received the highest discomfort scores when the backpacks were carried at the L3 position. Conversely, the discomfort rating for the neck and shoulders where the highest when the backpack was at the T7 position; this high backpack position also caused more head flexion than the other two positions. For the musculoskeletal health of children, the findings suggest that carrying a school backpack weighing 15% of BW should be avoided, and carrying at the T12 position may be recommended for schoolboys.

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Conflict of interest statement

Competing Interests: The authors have declared that no competing interests exist.

Figures

Fig 1
Fig 1. Backpack positions and body postures examined.
Fig 2
Fig 2. Comparison of body postures and muscle activation associated with backpack weights and positions.
See this image and copyright information in PMC

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