Document Detail

Adaptations to changing speed, load, and gradient in human walking: Cost of transport, optimal speed, and pendulum.
MedLine Citation:
PMID:  24102934     Owner:  NLM     Status:  Publisher    
It has been observed that the optimal speed (OPT) of human walking is independent of load on level surfaces because of the unaltered trajectory of the center of mass and consequent conservation of the pendular mechanism. However, the role of the inverted pendulum mechanism that combines speed, load, and gradient during walking remains unknown. In the present study, 10 subjects walked on a treadmill, with and without loading (25% of the body mass), at different speeds and slopes (0%, +7%, and +15%). The three-dimensional motion and VO2 were simultaneously registered. The mechanical external and internal work and the cost of transport (C) changed with the speed and gradient, but the load only affected C. OPT decreased with increasing gradient, and the pendular mechanics (R) was modified mainly as a result of changes in speed and gradient. OPT and R were independent of the load in these gradients. Remarkably, R increased with increasing speed and decreased (to 30%) with an increasing gradient; moreover, R was independent of load. Therefore, the energy-saving strategy by the pendular mechanism persists, although at a diminished level, in loaded walking on gradients and partially explains the OPT in this condition.
N A Gomeñuka; R L Bona; R G da Rosa; L A Peyré-Tartaruga
Related Documents :
12689364 - Pharmacological strategies for preventing cochlear damage induced by noise trauma.
24854054 - A hybrid indoor ambient light and vibration energy harvester for wireless sensor nodes.
21078014 - The effect of stimulus type and background noise on hearing abilities of the round goby...
20616054 - Biological role of noise encoded in a genetic network motif.
20097444 - Antioxidant content in two cam bromeliad species as a response to seasonal light change...
7425954 - Interaural time discrimination ability of listeners with sensorineural hearing loss.
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-9-17
Journal Detail:
Title:  Scandinavian journal of medicine & science in sports     Volume:  -     ISSN:  1600-0838     ISO Abbreviation:  Scand J Med Sci Sports     Publication Date:  2013 Sep 
Date Detail:
Created Date:  2013-10-9     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9111504     Medline TA:  Scand J Med Sci Sports     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
© 2013 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd.
Exercise Research Laboratory, Federal University of Rio Grande do Sul, Porto Alegre, Brazil.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms

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

Previous Document:  Consistency and Completeness of Reported Outcomes in Randomized Trials of Primary Immunosuppression ...