| Energy Cost and Mechanical Work of Walking During Load Carriage in Soldiers. | |
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MedLine Citation:
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PMID: 22215177 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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In the military context, soldiers carry equipments of total mass often exceeding 30 to 40 % of their body mass (BM) and complexly distributed around their body (backpack, weapons, electronics, protections, etc.), which represents severe load carrying conditions. PURPOSE: to better understand the effects of load carriage on walking energetics and mechanics during military-type walking. METHODS: ten male infantrymen recently retired from the French Foreign Legion performed 3-min walking trials at a constant speed of 4 km.h on an instrumented treadmill, during which walking pattern spatio-temporal parameters, energy cost (CW), external mechanical work (Wext) and the work done by one leg against the other during the double contact period (Wint,dc) were specifically assessed. Three conditions were tested: (i) light Sportswear (SP, reference condition considered as unloaded), (ii) Battle equipment (BT, ∼22 kg, ∼27 % of subjects' BM, corresponding to a military intermediate-load) and (iii) Road March equipment (RM, ∼38 kg, ∼46 % of subjects' BM, corresponding to a military high-load). RESULTS: repeated-measures analyses of variance showed that military equipment carriage significantly (i) altered the spatio-temporal pattern of walking (all P < 0.01), (ii) increased absolute gross and net CW (P < 0.0001), (iii) increased both absolute and mass-relative Wext (P < 0.01) and Wint,dc (P < 0.0001), but did not alter the inverted pendulum recovery or locomotor efficiency. CONCLUSION: military equipments carriage induced significant changes in walking mechanics and energetics, but these effects appeared not greater than those reported with loads carried around the waist and close to the center of mass. This result was not expected since the latter has been hypothesized to be the optimal method of load carriage from a metabolic standpoint. |
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Authors:
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Jordane G Grenier; Nicolas Peyrot; Josiane Castells; Roger Oullion; Laurent Messonnier; Jean-Benoit Morin |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-12-30 |
Journal Detail:
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Title: Medicine and science in sports and exercise Volume: - ISSN: 1530-0315 ISO Abbreviation: - Publication Date: 2011 Dec |
Date Detail:
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Created Date: 2012-1-4 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8005433 Medline TA: Med Sci Sports Exerc Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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1University of Lyon, F-42023, Saint Etienne, France. Laboratory of Exercise Physiology (EA4338), F-42000, Saint-Etienne, France; 2Safran Group, Sagem, Land Warfare, F-91300, Massy, France; 3University of La Reunion, UFR SHE, CURAPS-DIMPS (EA4075), F-97430, Le Tampon, Reunion Island, France; 4Sports Medicine and Myology Unit, Bellevue Hospital, University Hospital Center, F-42055, Saint-Etienne, France; 5University of Savoie, Laboratory of Exercise Physiology (EA4338), F-73376, Le Bourget du Lac, France. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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