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Walking at non‐constant speeds: mechanical work, pendular transduction, and energy congruity
Author(s) -
Balbinot G.
Publication year - 2017
Publication title -
scandinavian journal of medicine and science in sports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.575
H-Index - 115
eISSN - 1600-0838
pISSN - 0905-7188
DOI - 10.1111/sms.12667
Subject(s) - mechanical energy , work (physics) , constant (computer programming) , energy (signal processing) , gait , elastic energy , mechanics , pendulum , internal energy , potential energy , physics , simulation , physical medicine and rehabilitation , computer science , classical mechanics , thermodynamics , medicine , power (physics) , quantum mechanics , programming language
Although almost half of all walking bouts in urban environments consist of less than 12 consecutive steps and several day‐to‐day gait activities contain transient gait responses, in most studies gait analysis is performed at steady‐state. This study aimed to analyze external ( W ext ) and internal mechanical work ( W int ), pendulum‐like mechanics, and elastic energy usage during constant and non‐constant speeds. The mechanical work, pendular transduction, and energy congruity (an estimate of storage and release of elastic energy) during walking were computed using two force platforms. We found that during accelerating gait (+NCS) energy recovery is maintained, besides extra W + ext , for decelerating gait (−NCS) poor energy recovery was counterbalanced by W − ext and C% predominance. We report an increase in elastic energy usage with speed (4–11%). Both W − ext and %C suggests that elastic energy usage is higher at faster speeds and related to −NCS (≈20% of elastic energy usage). This study was the first to show evidences of elastic energy usage during constant and non‐constant speeds.