The effect of backpack load on the gait of normal adolescent girls

Hung Kay Daniel CHOW, Monica L. Y. KWOK, Alexander C. K. AU-YANG, Andrew D. HOLMES, Jack C. Y. CHENG, Fiona Y. D. YAO, M. S. WONG

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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. Copyright © 2005 Taylor & Francis Group Ltd.
Original languageEnglish
Pages (from-to)642-656
JournalErgonomics
Volume48
Issue number6
DOIs
Publication statusPublished - 15 May 2005

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body weight
Gait
Kinematics
Bearings (structural)
Musculoskeletal system
adolescent
Body Weight
Load limits
Analysis of variance (ANOVA)
Biomechanical Phenomena
Hip
Joints
female adolescent
demand
Musculoskeletal System
Weight-Bearing
Ankle
Knee
Analysis of Variance
lack

Citation

Chow, D. H. K., Kwok, M. L. Y., Au-Yang, A. C. K., Holmes, A. D., Cheng, J. C. Y., Yao, F. Y. D., & Wong, M. S. (2005). The effect of backpack load on the gait of normal adolescent girls. Ergonomics, 48(6), 642-656. doi: 10.1080/00140130500070921

Keywords

  • Adolescent idiopathic scoliosis
  • Backpack
  • Gait