Résumé
1. Introduction
Muscle strength declines with age and this is accompanied by changes in gait mechanics. A typical change that has been observed is the distal to proximal redistribution of joint work, from a dominancy of ankle work to hip joint work [1]. This redistribution might result in an increase in the external work performed on the center of mass (CoM) for the step-to-step transition in walking and concomitant increase in energy cost of walking [2].
2. Research question
In this study we investigated the changes in external mechanical work during step-to-step transition and single support of walking over the lifespan. It was hypothesized that, as a result from the distal-to-proximal redistribution of joint work, push off work in the trailing leg work would decrease and leading leg collision work during the step-to-step transition would increase with age, while single support work would increase with age.
3. Methods
Seventy-four healthy adults, uniformly distributed over the age range between 18 and 79 yr, walked on a dual belt instrumented treadmill with a split belt protocol of which the two tight belt baseline speeds (0.7 and 1.4 m/s) were analyzed for the purpose of this study. External mechanical work on the CoM was calculated separately for the single support (SS) and step-to-step (S2S) transition phases [3]. Linear regression analyses were performed to investigate the effect of age on external mechanical work during step-to-step and single support phases.
4. Results
Positive push off work during step-to-step transition decreased with age (1.4 m s−1: −0.102 J/year p = .05, .7 m s−1 -0.088 J/year p = .007), while negative collision work increased with age (1.4 m s−1: −0.191 J/year p < .001, .7 m s−1: −0.052 J/year p = .007). Concurrently, single support work increased with age (1.4 m s−1: +0.286 J/year p < .001, .7 m s−1: +0.113 J/year p = .007)
Muscle strength declines with age and this is accompanied by changes in gait mechanics. A typical change that has been observed is the distal to proximal redistribution of joint work, from a dominancy of ankle work to hip joint work [1]. This redistribution might result in an increase in the external work performed on the center of mass (CoM) for the step-to-step transition in walking and concomitant increase in energy cost of walking [2].
2. Research question
In this study we investigated the changes in external mechanical work during step-to-step transition and single support of walking over the lifespan. It was hypothesized that, as a result from the distal-to-proximal redistribution of joint work, push off work in the trailing leg work would decrease and leading leg collision work during the step-to-step transition would increase with age, while single support work would increase with age.
3. Methods
Seventy-four healthy adults, uniformly distributed over the age range between 18 and 79 yr, walked on a dual belt instrumented treadmill with a split belt protocol of which the two tight belt baseline speeds (0.7 and 1.4 m/s) were analyzed for the purpose of this study. External mechanical work on the CoM was calculated separately for the single support (SS) and step-to-step (S2S) transition phases [3]. Linear regression analyses were performed to investigate the effect of age on external mechanical work during step-to-step and single support phases.
4. Results
Positive push off work during step-to-step transition decreased with age (1.4 m s−1: −0.102 J/year p = .05, .7 m s−1 -0.088 J/year p = .007), while negative collision work increased with age (1.4 m s−1: −0.191 J/year p < .001, .7 m s−1: −0.052 J/year p = .007). Concurrently, single support work increased with age (1.4 m s−1: +0.286 J/year p < .001, .7 m s−1: +0.113 J/year p = .007)
langue originale | Anglais |
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titre | ESMAC 2021 Abstracts |
Editeur | Elsevier |
Pages | 274-275 |
Nombre de pages | 2 |
Volume | 90 |
Edition | S1 |
Les DOIs | |
état | Publié - oct. 2021 |
Modification externe | Oui |
Evénement | Annual Meeting of the European Society for Movement Analysis in Adults and Children 2021 - Durée: 14 oct. 2021 → 15 oct. 2021 https://www.esmac2021.org/ |
Série de publications
Nom | Gait & Posture |
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Editeur | Elsevier |
nombre | 1 |
Volume | 90 |
ISSN (Electronique) | 0966-6362 |
Une conférence
Une conférence | Annual Meeting of the European Society for Movement Analysis in Adults and Children 2021 |
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Titre abrégé | ESMAC 2021 |
période | 14/10/21 → 15/10/21 |
Adresse Internet |