Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/17199
Title: The effect of backpack load on the gait of normal adolescent girls
Authors: Chow, DHK
Kwok, MLY
Au Yang, ACK
Holmes, AD
Cheng, JCY
Yao, FYD
Wong, MS 
Keywords: Adolescent idiopathic scoliosis
Backpack
Gait
Issue Date: 2005
Publisher: Taylor & Francis
Source: Ergonomics, 2005, v. 48, no. 6, p. 642-656 How to cite?
Journal: Ergonomics 
Abstract: Concerns regarding the effects of load carriage have led to recommendations that backpacks be limited to 10-15% of body weight, based on significant changes in physical performance. However, gait responses to backpack loads are not entirely consistent and there is a particular lack of data regarding load-bearing gait in adolescent females. Gait patterns of 22 normal adolescent girls were recorded at backpack loads of 0, 7.5, 10.0, 12.5 and 15.0% body weight. Temporal-distance, ground reaction force and joint kinematic, moment and power parameters were analysed by repeated measures ANOVA with factors of backpack load and side (left or right). Walking speed and cadence decreased significantly with increasing backpack load, while double support time increased. Kinematic changes were most marked at the proximal joints, with a decreased pelvic motion but a significant increase in the hip sagittal plane motion. Increased moments and power at the hip, knee and ankle showed increasing demand with backpack load. Parameters showed different responses to increasing load, and those that suggested a critical load indicated this to be approximately 10% body weight. While this may be due to a change in gait due to increased demand, further work is required to verify this and also to examine the cumulative effects of backpack load on the musculoskeletal system, which may be more appropriate in determining recommended load limits.
URI: http://hdl.handle.net/10397/17199
ISSN: 0014-0139
EISSN: 1366-5847
DOI: 10.1080/00140130500070921
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