Document Detail


Comparison of the effects of backpack loading and of walking speed on foot-floor contact patterns.
MedLine Citation:
PMID:  9857838     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Load-bearing over variable distances at diverse speeds constitutes a major component of manual materials handling activities that persist as ergonomic concerns even in the most technologically advanced societies. The mechanisms of slipping and tripping relate in part to the way pedal segments approach or leave the walking surface. To demonstrate the kinematic effects of load and speed, as measured underfoot, i.e. at the worker-substrate interface, 45 young adult males traversed a 40 m walkway unburdened, and with 20%, 30%, 40%, 50% and 60% bodyweight backpack loads, under controlled speed conditions. The same subjects also walked unburdened at 0.83 m s-1 to 2.22 m s-1 (i.e. in 1 km h-1 increments between 3 and 8 km h-1). Telemetric footswitch technology was used to obtain temporal patterns of heel, lateral and medial ball and toe of each foot. The findings of this study, in which subjects were shoeless, help to establish 'baseline' descriptions of foot-floor contact patterns, unaffected by interindividual differences due to shoe or boot rigidity. From these, measured or derived data on temporal statistical parameters were obtained which show that all make- and break-contacts of pedal segments occur absolutely and relatively faster as speed increases, whereas forefoot contacts are made faster and broken slower as loads increase. Under loading the earlier phases of stance simulate an increased speed pattern, whereas the later phases of stance simulate a reduced speed pattern.
Authors:
J Charteris
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Ergonomics     Volume:  41     ISSN:  0014-0139     ISO Abbreviation:  Ergonomics     Publication Date:  1998 Dec 
Date Detail:
Created Date:  1999-02-04     Completed Date:  1999-02-04     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0373220     Medline TA:  Ergonomics     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  1792-809     Citation Subset:  IM; S    
Affiliation:
Department of Human Movement Studies, Rhodes University, Grahamstown, South Africa.
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MeSH Terms
Descriptor/Qualifier:
Acceleration
Adolescent
Adult
Foot / physiology*
Gait / physiology
Human Engineering
Humans
Male
Walking / physiology*
Weight-Bearing / physiology*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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