TITLE

Efficiency of Movement in Health and Chronic Disease

AUTHOR(S)
Perrault, H.
PUB. DATE
April 2006
SOURCE
Clinical & Investigative Medicine;Apr2006, Vol. 29 Issue 2, p117
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Mechanical efficiency of movement expressed the efficacy of skeletal muscles to transform biochemical energy into "external work" or movement. In young health humans, the mechanical efficiency and / or the work economy of various locomotor activities such as cycling, up-hill walking or running, stair climbing or swimming varies from 5 - 9% for swimming t 20-25% for cycling ergometry or stair climbing. There are five potential steps at which an extra demand or "wasting" of energy may occur in supplying energy to the contracting muscle: a) the resting metabolism b) the cost of ventilation b) the percentage of moles of ATP produced per mole of atomic oxygen processed through the mitochondria c) the percentage of molecular ATP used by myofibrils for tension production and d) the cost of multi-segment movement coordination towards a locomotor displacement. This article presents the tittle evidence available on the efficiency of movement in patients chronic diseases such as COPD and discusses the mechanisms through which chronic disease may contribute to a potential "exagerated energy demand" or "energy wastage".
ACCESSION #
20612607

 

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