Energy-saving walking mechanisms in obese adults.

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State: Public
Version: author
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Serval ID
serval:BIB_3A10A74D6A25
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Energy-saving walking mechanisms in obese adults.
Journal
Journal of applied physiology
Author(s)
Fernández Menéndez A., Saubade M., Millet G.P., Malatesta D.
ISSN
1522-1601 (Electronic)
ISSN-L
0161-7567
Publication state
Published
Issued date
01/05/2019
Peer-reviewed
Oui
Volume
126
Number
5
Pages
1250-1258
Language
english
Notes
Publication types: Journal Article
Publication Status: ppublish
Abstract
Energy-saving mechanisms are used in human walking. In obese adults the energy cost of walking (C <sub>w</sub> ) is higher compared with normal-body mass adults. However, the biomechanical factors involved in this extra cost should result in a higher C <sub>w</sub> . The aim of this study was to compare energy-saving walking mechanisms [i.e., mechanical energy saved via pendulum (Recovery) and maximum possible elastic energy usage (MPEEu)] and their influence on C <sub>w</sub> in obese vs. lean individuals. The net C <sub>w</sub> (NetC <sub>w</sub> ), external work (W <sub>ext</sub> ), Recovery, MPEEu, and gait weight transfer duration (gWT) were computed for 13 lean [L; body mass index (BMI) 21.9 ± 1.5 kg/m <sup>2</sup> ] and 13 obese (O; BMI 33.8 ± 2.5 kg/m <sup>2</sup> ) individuals during treadmill walking at five speeds (0.56, 0.83, 1.11, 1.39, 1.67 m/s). No significant difference was found between groups in relative (per kg of body mass) NetC <sub>w</sub> (P = 0.13). Relative positive W <sub>ext</sub> was significantly lower at the three fastest speeds (P ≤ 0.003) whereas Recovery was higher at the two fastest speeds (P ≤ 0.01) in O than in L individuals. MPEEu tended to be lower in O than in L (P = 0.06), with significantly lower values in O compared with L at 1.39 and 1.67 m/s (P ≤ 0.017). gWT was significantly shorter in O than in L individuals at 1.67 m/s (P = 0.001). The present results reveal that obese adults rely more on the pendular mechanism than on the storage and release of elastic energy for decreasing the amount of positive W <sub>ext</sub> and thus limiting the increase in the relative NetC <sub>w</sub> . NEW & NOTEWORTHY We observed that obese individuals had a lower maximum possible elastic energy usage per kilogram of body mass than their lean counterparts and they may rely more on the pendular mechanism of walking than on the storage and release of elastic energy for decreasing the external mechanical work and thus limiting the increase in the relative net energy cost of walking.
Keywords
Physiology (medical), Physiology, elastic energy, energy cost, external work, gait, recovery
Pubmed
Web of science
Create date
03/03/2019 9:50
Last modification date
16/02/2021 7:26
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