Transient Effect at the Onset of Human Running.

Christian Weich,Randall L Jensen,Manfred M Vieten

doi:10.3390/bios10090117

Christian Weich, Randall L Jensen + Show 1 more

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https://doi.org/10.3390/bios10090117

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Journal: Biosensors	Publication Date: Sep 8, 2020
Citations: 4	License type: CC BY 4.0

Affiliation: University of Konstanz, Northern Michigan University

Abstract

While training and competing as a runner, athletes often sense an unsteady feeling during the first meters on the road. This sensation, termed as transient effect, disappears after a short period as the runners approach their individual running rhythm. The foundation of this work focuses on the detection and quantification of this phenomenon. Thirty athletes ran two sessions over 60 min on a treadmill at moderate speed. Three-dimensional acceleration data were collected using two MEMS sensors attached to the lower limbs. By using the attractor method and Fourier transforms, the transient effect was isolated from noise and further components of human cyclic motion. A substantial transient effect was detected in 81% of all measured runs. On average, the transient effect lasted 5.25 min with a range of less than one minute to a maximum of 31 min. A link to performance data such as running level, experience and weekly training hours could not be found. The presented work provides the methodological basis to detect and quantify the transient effect at moderate running speeds. The acquisition of further physical or metabolic performance data could provide more detailed information about the impact of the transient effect on athletic performance.

Highlights

Human motion, even the movements which are repeated many thousand times, e.g., by athletes, cannot be called absolutely consistent and stable [1,2]
It is apparent that changes in movement patterns have an influence on the subsequent motion kinematics and must be highly controlled and regulated by the body and the brain, respectively
Athletes often sense an irregular or uneven way of running at the onset of their exercise or in these post cycling performances in triathlons and report that this phenomenon commonly subsides within a few minutes [9,12]. This phase of finding-a-rhythm might be related to the well-known transient oscillations described in dynamical systems [13]

Summary

Introduction

Human motion, even the movements which are repeated many thousand times, e.g., by athletes, cannot be called absolutely consistent and stable [1,2]. The change between two forms of movement, like from walking to running and back [7,8] or cycling to running in triathlon [9,10,11]. Athletes often sense an irregular or uneven way of running at the onset of their exercise or in these post cycling performances in triathlons and report that this phenomenon commonly subsides within a few minutes [9,12]. This phase of finding-a-rhythm might be related to the well-known transient oscillations described in dynamical systems [13]. The crossed trajectories, i.e., the paths of the systems’ states over time, Biosensors 2020, 10, 117; doi:10.3390/bios10090117 www.mdpi.com/journal/biosensors

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