Effects of backpack load placement on pulmonary capacities of normal schoolchildren during upright stance

摘要

Backpack carriage affects posture, physiological costs and physical performance. Limited literature concerning the effects of backpack load placement on pulmonary capacities of schoolchildren has been reported. The objective was to assess the effects of backpack load placement on pulmonary capacities of normal schoolchildren. Forced vital capacity (FVC), forced expiratory volume in 1 s (FEV1), peak expiratory flow (PEF), and forced expiratory flow (FEF25-75%) were measured in 22 normal schoolchildren with a mean age of 12 years during free standing and when carrying a backpack of 15% bodyweight with its center of gravity positioned at T7, T12 and L3. The main effect of load was found to be significant for FVC and FEV1. However, no significant effect of load placements on the pulmonary function of schoolchildren was found. Manipulation of load placements may not alleviate the restrictive effects exerted on the pulmonary function resulted from backpack load carriage. Relevance to industry: Daily carriage of a school backpack on the musculoskeletal health of children and adolescents has become an area of concern. Restrictive effects on the pulmonary function due to backpack carriage were reported and it is useful to explore whether these effects could be alleviated by manipulating the backpack center of gravity level.