Affiliation:
1. Egas Moniz Interdisciplinary Research Centre (CiiEM) Egas Moniz School of Health & Science Campus Universitário, Quinta da Granja 2829 ‐ 511 Monte de Caparica Portugal
2. Division of Biomechanics and Research Development and Center for Research in Human Movement Variability University of Nebraska at Omaha 6160 University Drive Omaha NE 68182‐0860 USA
3. Laboratório de Instrumentação, Engenharia Biomédica e Física da Radiação (LIBPhys‐UNL), Departamento de Física Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa 2829‐516 Caparica Portugal
Abstract
AbstractPhysiological processes present daily oscillations of ≈24 h, called circadian rhythms. Motor performance, for example, reaches its peak in the afternoon, although this can be affected by chronotype. Certain motor activities, for example, walking, can also be affected by circadian rhythms. Healthy walking exhibits stride‐to‐stride fluctuations with a fractal‐like structure that enables adaptability. While pathology and aging are shown to lead to random‐like fluctuations; and, therefore, decreased adaptability; the influence of circadian rhythms remains unknown. This study investigates how these fluctuations present in healthy gait are affected by the time of day and chronotype. Eighteen young adults walk for 10 min every 2 h, from 8 a.m. to 6 p.m. Footswitches are used to determine heel‐strike and calculate stride time. Then, detrended fluctuation analysis is used to calculate fractal scaling. A mixed‐model Analysis of Variance is used and followed by a backward stepwise elimination process. Tukey's tests are used for pairwise comparisons. The statistical model shows the effect of time during the day (12 p.m. exhibits a higher fractal scaling compared to 8 a.m.); and chronotype (evening‐types exhibit higher fractal scaling compared to morning‐types). This study reveals the influence of chronobiology on stride‐to‐stride fluctuations. These findings open new perspectives to integrate circadian medicine in biomechanics.
Funder
National Institutes of Health
Cited by
1 articles.
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