The Extra Load Index as a method for comparing the relative economy of load carriage systems

Ray Lloyd, Karen Hind, Bridget Parr, Simeon Davies, Carlton Cooke

Research output: Contribution to journalArticle

  • 3 Citations

Abstract

The Extra Load Index (ELI) has been proposed as a suitable method of assessing the relative economy of load carriage systems. The purpose of this study was to determine, based on empirical evidence, that the ELI can accommodate variations in both body composition and added load. In total, 30 women walked carrying loads of up to 70% body mass at self-selected walking speeds whilst expired air was collected. In addition, each of the women had body composition assessed via dual energy X-ray absorptiometry. Results show that the ELI is independent of body composition variables, the magnitude of additional loads and the speed of progression. Consequently, it is suggested that it represents an appropriate method of comparing load carriage systems in both scientific and commercial arenas. Statement of Relevance:This paper demonstrates that ELI is independent of body composition, added load and speed and is therefore an appropriate method to generalise comparisons of load carriage systems. It has the advantage of being easily understood by manufacturers and consumers whilst retaining appropriate scientific precision.
Original languageEnglish
Pages (from-to)1500-1504
Number of pages5
JournalErgonomics
Volume53
Issue number12
DOIs
StatePublished - Dec 2010

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body
index
Body Composition
Chemical analysis
method
system
speed
economy
woman
Photon Absorptiometry
Walking
Air
X rays
statement
air
consumer
relevance
energy
comparison

Cite this

Lloyd, R., Hind, K., Parr, B., Davies, S., & Cooke, C. (2010). The Extra Load Index as a method for comparing the relative economy of load carriage systems. Ergonomics, 53(12), 1500-1504. DOI: 10.1080/00140139.2010.528454

Lloyd, Ray; Hind, Karen; Parr, Bridget; Davies, Simeon; Cooke, Carlton / The Extra Load Index as a method for comparing the relative economy of load carriage systems.

In: Ergonomics, Vol. 53, No. 12, 12.2010, p. 1500-1504.

Research output: Contribution to journalArticle

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abstract = "The Extra Load Index (ELI) has been proposed as a suitable method of assessing the relative economy of load carriage systems. The purpose of this study was to determine, based on empirical evidence, that the ELI can accommodate variations in both body composition and added load. In total, 30 women walked carrying loads of up to 70% body mass at self-selected walking speeds whilst expired air was collected. In addition, each of the women had body composition assessed via dual energy X-ray absorptiometry. Results show that the ELI is independent of body composition variables, the magnitude of additional loads and the speed of progression. Consequently, it is suggested that it represents an appropriate method of comparing load carriage systems in both scientific and commercial arenas. Statement of Relevance:This paper demonstrates that ELI is independent of body composition, added load and speed and is therefore an appropriate method to generalise comparisons of load carriage systems. It has the advantage of being easily understood by manufacturers and consumers whilst retaining appropriate scientific precision.",
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Lloyd, R, Hind, K, Parr, B, Davies, S & Cooke, C 2010, 'The Extra Load Index as a method for comparing the relative economy of load carriage systems' Ergonomics, vol 53, no. 12, pp. 1500-1504. DOI: 10.1080/00140139.2010.528454

The Extra Load Index as a method for comparing the relative economy of load carriage systems. / Lloyd, Ray; Hind, Karen; Parr, Bridget; Davies, Simeon; Cooke, Carlton.

In: Ergonomics, Vol. 53, No. 12, 12.2010, p. 1500-1504.

Research output: Contribution to journalArticle

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Lloyd R, Hind K, Parr B, Davies S, Cooke C. The Extra Load Index as a method for comparing the relative economy of load carriage systems. Ergonomics. 2010 Dec;53(12):1500-1504. Available from, DOI: 10.1080/00140139.2010.528454