A comparison of economy and sagittal plane trunk movements among back-, back/front- and head-loading

Sean Hudson; Carlton Cooke; Simeon Davies; Sacha West; Raeeq Gamieldien; Chris Low; Ray Lloyd

doi:10.1080/00140139.2018.1474267

A comparison of economy and sagittal plane trunk movements among back-, back/front- and head-loading

Sean Hudson, Carlton Cooke, Simeon Davies, Sacha West, Raeeq Gamieldien, Chris Low, Ray Lloyd

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Abstract

It has been suggested that freedom of movement in the trunk could influence load carriage economy. This study aimed to compare the economy and sagittal plane trunk movements associated with three load carriage methods that constrain posture differently. Eighteen females walked at 3 km.h-1 with loads of 0, 3, 6, 9, 12, 15 and 20 kg carried on the back, back/front and head. Load carriage economy was assessed using the Extra Load Index (ELI). Change in sagittal plane trunk forward lean and trunk angle excursion from unloaded to loaded walking were assessed. Results show no difference in economy between methods (p = 0.483), despite differences in the change in trunk forward lean (p = 0.001) and trunk angle excursion (p = 0.021) from unloaded to loaded walking. We conclude that economy is not different among the three methods of load carriage, despite significant differences in sagittal plane trunk movements.

Original language	English
Pages (from-to)	1-25
Number of pages	25
Journal	Ergonomics
Early online date	14 May 2018
DOIs	https://doi.org/10.1080/00140139.2018.1474267
Publication status	Published - 3 Jul 2018

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Journal Article

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10.1080/00140139.2018.1474267

Hudson_et_al_2018_ErgonomicsAccepted author manuscript, 286 KBLicence: CC BY-NC-ND

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abstract = "It has been suggested that freedom of movement in the trunk could influence load carriage economy. This study aimed to compare the economy and sagittal plane trunk movements associated with three load carriage methods that constrain posture differently. Eighteen females walked at 3 km.h-1 with loads of 0, 3, 6, 9, 12, 15 and 20 kg carried on the back, back/front and head. Load carriage economy was assessed using the Extra Load Index (ELI). Change in sagittal plane trunk forward lean and trunk angle excursion from unloaded to loaded walking were assessed. Results show no difference in economy between methods (p = 0.483), despite differences in the change in trunk forward lean (p = 0.001) and trunk angle excursion (p = 0.021) from unloaded to loaded walking. We conclude that economy is not different among the three methods of load carriage, despite significant differences in sagittal plane trunk movements.",

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AU - Low, Chris

AU - Lloyd, Ray

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AB - It has been suggested that freedom of movement in the trunk could influence load carriage economy. This study aimed to compare the economy and sagittal plane trunk movements associated with three load carriage methods that constrain posture differently. Eighteen females walked at 3 km.h-1 with loads of 0, 3, 6, 9, 12, 15 and 20 kg carried on the back, back/front and head. Load carriage economy was assessed using the Extra Load Index (ELI). Change in sagittal plane trunk forward lean and trunk angle excursion from unloaded to loaded walking were assessed. Results show no difference in economy between methods (p = 0.483), despite differences in the change in trunk forward lean (p = 0.001) and trunk angle excursion (p = 0.021) from unloaded to loaded walking. We conclude that economy is not different among the three methods of load carriage, despite significant differences in sagittal plane trunk movements.

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A comparison of economy and sagittal plane trunk movements among back-, back/front- and head-loading

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