Mechanical external work and recovery at preferred walking speed in obese subjects

Details

Serval ID
serval:BIB_1422587E437F
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Mechanical external work and recovery at preferred walking speed in obese subjects
Journal
Medicine and Science in Sports and Exercises
Author(s)
Malatesta D., Vismara L., Menegoni F., Galli M., Romei M., Capodaglio P.
ISSN
1530-0315[electronic]
Publication state
Published
Issued date
2009
Volume
41
Number
2
Pages
426-434
Language
english
Notes
Publication types: Journal Article Publication Status: ppublish
Abstract
PURPOSE: The aim of this study was to compare the mechanical external work (per kg) and pendular energy transduction at preferred walking speed (PWS) in obese versus normal body mass subjects to investigate whether obese adults adopt energy conserving gait mechanics. METHODS: The mechanical external work (Wext) and the fraction of mechanical energy recovered by the pendular mechanism (Rstep) were computed using kinematic data acquired by an optoelectronic system and were compared in 30 obese (OG; body mass index [BMI] = 39.6 +/- 0.6 kg m(-2); 29.5 +/- 1.3 yr) and 19 normal body mass adults (NG; BMI = 21.4 +/- 0.5 kg m(-2); 31.2 +/- 1.2 yr) walking at PWS. RESULTS: PWS was significantly lower in OG (1.18 +/- 0.02 m s(-1)) than in NG (1.33 +/- 0.02 m s(-1); P <or= 0.001). There was no significant difference in Wext per unit mass between groups (OG: 0.36 +/- 0.03 J kg(-1) m(-1); NG: 0.31 +/- 0.02 J kg(-1) m(-1); P = 0.12). Rstep was significantly lower in OG (68.4% +/- 2.0%) compared with NG (74.4% +/- 1.0%; P = 0.01). In OG only, Wext per unit mass was positively correlated with PWS (r = 0.57; P < 0.001). CONCLUSION: Obese adults do not appear to alter their gait to improve pendular energy transduction and may select slower PWS to reduce mechanical and metabolic work.
Keywords
Adult, Biomechanics, Case-Control Studies, Female, Gait/physiology, Humans, Male, Obesity/physiopathology, Physical Exertion/physiology, Walking/physiology, Young Adult
Pubmed
Create date
13/07/2008 23:24
Last modification date
20/08/2019 12:42
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