Measurement of the mechanical power of walking by satellite positioning system (GPS).

Détails

ID Serval
serval:BIB_D9BD25B235A3
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Measurement of the mechanical power of walking by satellite positioning system (GPS).
Périodique
Medicine and Science in Sports and Exercise
Auteur(s)
Terrier P., Ladetto Q., Merminod B., Schutz Y.
ISSN
0195-9131 (Print)
ISSN-L
0195-9131
Statut éditorial
Publié
Date de publication
11/2001
Volume
33
Numéro
11
Pages
1912-1918
Langue
anglais
Notes
Publication types: Clinical Trial ; Evaluation Studies ; Journal Article ; Research Support, Non-U.S. Gov't
Publication Status: ppublish
Résumé
PURPOSE: This descriptive article illustrates the application of Global Positioning System (GPS) professional receivers in the field of locomotion studies. The technological challenge was to assess the external mechanical work in outdoor walking.
METHODS: Five subjects walked five times during 5 min on an athletic track at different imposed stride frequency (from 70-130 steps x min(-1)). A differential GPS system (carrier phase analysis) measured the variation of the position of the trunk at 5 Hz. A portable indirect calorimeter recorded breath-by-breath energy expenditure.
RESULTS: For a walking speed of 1.05 +/- 0.11 m x s(-1), the vertical lift of the trunk (43 +/- 14 mm) induced a power of 46.0 +/- 20.4 W. The average speed variation per step (0.15 +/- 0.03 m x s(-1)) produced a kinetic power of 16.9 +/- 7.2 W. As compared with commonly admitted values, the energy exchange (recovery) between the two energy components was low (39.1 +/- 10.0%), which induced an overestimated mechanical power (38.9 +/- 18.3 W or 0.60 W x kg(-1) body mass) and a high net mechanical efficiency (26.9 +/- 5.8%).
CONCLUSION: We assumed that the cause of the overestimation was an unwanted oscillation of the GPS antenna. It is concluded that GPS (in phase mode) is now able to record small body movements during human locomotion, and constitutes a promising tool for gait analysis of outdoor unrestrained walking. However, the design of the receiver and the antenna must be adapted to human experiments and a thorough validation study remains to be conducted.
Mots-clé
Adult, Biomechanics, Energy Metabolism/physiology, Equipment Design, Female, Gait/physiology, Humans, Male, Satellite Communications/instrumentation, Sensitivity and Specificity, Walking/physiology
Pubmed
Web of science
Création de la notice
21/01/2008 14:07
Dernière modification de la notice
03/03/2018 21:53
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