Using accelerations of single inertial measurement units to determine the intensity level of light-moderate-vigorous physical activities: Technical and mathematical considerations

Quantifying physical activity and estimating the metabolic equivalent of tasks based on inertial measurement units has led to the emergence of multiple methods and data reduction approaches known as physical activity metrics. The present study aims to compare those metrics and reduction approaches b...

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Bibliographic Details
Published in:Journal of biomechanics 2020-06, Vol.107, p.109834-109834, Article 109834
Main Authors: Marin, Frédéric, Lepetit, Kevin, Fradet, Laetitia, Hansen, Clint, Ben Mansour, Khalil
Format: Article
Language:English
Subjects:
Acceleration
Ankle
Ankle Joint
Biomechanics
Data reduction
Engineering Sciences
Equivalence
Exercise
Gait
Humans
IMU
Inertial platforms
Laboratories
Localization
Luminous intensity
Mechanics
Motion capture
Physical activity
Run
Running
Sensors
Walking
Wearable inertial sensor
Wrist
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Summary:Quantifying physical activity and estimating the metabolic equivalent of tasks based on inertial measurement units has led to the emergence of multiple methods and data reduction approaches known as physical activity metrics. The present study aims to compare those metrics and reduction approaches based on descriptive and high order statistics. Data were obtained from 147 young healthy subjects wearing inertial measurement units at their wrist or ankle during standing, walking and running, labeled as light, medium or vigorous activities. The research question was, first, if those metrics allowed differentiating between light, moderate, and vigorous physical activities, and, secondly, what was the relationship with the metabolic equivalent of the task performed. The results showed that each metric differentiated the level of activity and presented a high correlation with the metabolic equivalent of the task. However, each metric and data reduction approach demonstrated its specific statistical characteristics related to the localization of the sensors. Our findings also confirm the absolute necessity to detail explicitly all calculus and post processing of metrics in order to quantify the level of activity by inertial measurement units.
ISSN:0021-9290
1873-2380
DOI:10.1016/j.jbiomech.2020.109834