scholarly journals Sit-To-Stand Movement Evaluated Using an Inertial Measurement Unit Embedded in Smart Glasses—A Validation Study

Sensors ◽  
2020 ◽  
Vol 20 (18) ◽  
pp. 5019
Author(s):  
Justine Hellec ◽  
Frédéric Chorin ◽  
Andrea Castagnetti ◽  
Serge S. Colson
Keyword(s):  
Concurrent Validity ◽  
Inertial Measurement Unit ◽  
Vertical Axis ◽  
Measurement Unit ◽  
Vertical Acceleration ◽  
Optoelectronic System ◽  
Inertial Measurement ◽  
Sit To Stand ◽  
Smart Glasses ◽  
Absolute Reliability

Wearable sensors have recently been used to evaluate biomechanical parameters of everyday movements, but few have been located at the head level. This study investigated the relative and absolute reliability (intra- and inter-session) and concurrent validity of an inertial measurement unit (IMU) embedded in smart eyeglasses during sit-to-stand (STS) movements for the measurement of maximal acceleration of the head. Reliability and concurrent validity were investigated in nineteen young and healthy participants by comparing the acceleration values of the glasses’ IMU to an optoelectronic system. Sit-to-stand movements were performed in laboratory conditions using standardized tests. Participants wore the smart glasses and completed two testing sessions with STS movements performed at two speeds (slow and comfortable) under two different conditions (with and without a cervical collar). Both the vertical and anteroposterior acceleration values were collected and analyzed. The use of the cervical collar did not significantly influence the results obtained. The relative reliability intra- and inter-session was good to excellent (i.e., intraclass correlation coefficients were between 0.78 and 0.91) and excellent absolute reliability (i.e., standard error of the measurement lower than 10% of the average test or retest value) was observed for the glasses, especially for the vertical axis. Whatever the testing sessions in all conditions, significant correlations (p < 0.001) were found for the acceleration values recorded either in the vertical axis and in the anteroposterior axis between the glasses and the optoelectronic system. Concurrent validity between the glasses and the optoelectronic system was observed. Our observations indicate that the IMU embedded in smart glasses is accurate to measure vertical acceleration during STS movements. Further studies should investigate the use of these smart glasses to assess the STS movement in unstandardized settings (i.e., clinical and/or home) and to report vertical acceleration values in an elderly population of fallers and non-fallers.

scholarly journals Rein tension during canter

2015 ◽  
Vol 11 (2) ◽  
pp. 107-117 ◽  
Author(s):  
A. Egenvall ◽  
M. Eisersiö ◽  
M. Rhodin ◽  
R. van Weeren ◽  
L. Roepstorff
Keyword(s):  
Mixed Models ◽  
Inertial Measurement Unit ◽  
Measurement Unit ◽  
Vertical Acceleration ◽  
Inertial Measurement ◽  
Maximal Acceleration

Riders generally use reins as a means for communication with the horse. At present, the signalling pattern is poorly understood. The aim of this study was to illustrate and analyse the rein tension patterns in a number of rider/horse combinations across a variety of exercises in the canter gait. Our hypothesis was that some riders will follow the movement of the horse more closely than others. Data were collected from eight professional riders riding each three (in one case two) horses that were familiar to them in canter. Horses were instrumented with rein tension meters logged by inertial measurement unit technique (IMU). Inside and outside rein tension data were synchronised with the gait using the vertical acceleration IMU-signal at the poll. Stride-split data (0-100 percentages) were analysed using mixed models technique to elucidate the inside/outside and stride percentage interaction, taking into account the exercises performed. In general, tension was maximal just before the beginning of vertical stance, as defined by the maximal acceleration of the head, with the release closer to the suspension phase. The release was significantly more marked on the outside rein, but between riders and horses the pattern varied substantially. In total 26% of the variation was represented by riders and 21% by the horses. On average there were significant inside/outside rein differences, but at the same time in some horse/rider combinations these differences did not exist.

scholarly journals Optimized scoring tool to quantify the functional performance during the sit-to-stand transition with a magneto-inertial measurement unit

2019 ◽  
Vol 69 ◽  
pp. 109-114
Author(s):  
Kevin Lepetit ◽  
Khalil Ben Mansour ◽  
Adrien Letocart ◽  
Sofiane Boudaoud ◽  
Kiyoka Kinugawa ◽  
...  
Keyword(s):  
Inertial Measurement Unit ◽  
Functional Performance ◽  
Measurement Unit ◽  
Inertial Measurement ◽  
Sit To Stand ◽  
Scoring Tool

scholarly journals Concurrent Validity of Accelerations Measured Using a Tri-Axial Inertial Measurement Unit while Walking on Firm, Compliant and Uneven Surfaces

PLoS ONE ◽  
2014 ◽  
Vol 9 (5) ◽  
pp. e98395 ◽  
Author(s):  
Michael H. Cole ◽  
Wolbert van den Hoorn ◽  
Justin K. Kavanagh ◽  
Steven Morrison ◽  
Paul W. Hodges ◽  
...  
Keyword(s):  
Concurrent Validity ◽  
Inertial Measurement Unit ◽  
Measurement Unit ◽  
Inertial Measurement

scholarly journals An Optimized Complementary Filter For An Inertial Measurement Unit Contain MPU6050 Sensor

2019 ◽  
Vol 15 (2) ◽  
pp. 71-77
Author(s):  
Ahmed Albaghdadi ◽  
Abduladhem Ali
Keyword(s):  
High Frequency ◽  
Inertial Measurement Unit ◽  
Vertical Axis ◽  
Measurement Unit ◽  
Second Step ◽  
Gray Wolf ◽  
Mathematical Relationship ◽  
Inertial Measurement ◽  
Complementary Filter ◽  
Gyroscope Sensor

It can be said that the system of sensing the tilt angle and speed of a multi-rotor copter come in the first rank among all the other sensors on the multi-rotor copters and all other planes due to its important roles for stabilization. The MPU6050 sensor is one of the most popular sensors in this field. It has an embedded 3-axis accelerometer and a 3-axis gyroscope. It is a simple sensor in dealing with it and extracting accurate data. Everything changes when this sensor is placed on the plane. It becomes very complicated to deal with it due to vibration of the motors on the multirotor copter. In this study, two main problems were diagnosed was solved that appear in most sensors when they are applied to a high-frequency vibrating environment. The first problem is how to get a precise angle of the sensor despite the presence of vibration. The second problem is how to overcome the errors that appear when the multirotor copter revolves around its vertical axis during the tilting in either direction x or y or both. The first problem was solved in two steps. The first step involves mixing data of the gyroscope sensor with the data of auxetometer sensor by a mathematical equation based on optimized complementary filter using gray wolf optimization algorithm GWO. The second step involves designing a suitable FIR filter for data. The second problem was solved by finding a non-linear mathematical relationship between the angles of the copter in both X and Y directions, and the rotation around the vertical axis of multirotor copter frame.

Evaluation of the kinetic energy of the torso by magneto-inertial measurement unit during the sit-to-stand movement

2018 ◽  
Vol 67 ◽  
pp. 172-176 ◽  
Author(s):  
Kevin Lepetit ◽  
Khalil Ben Mansour ◽  
Sofiane Boudaoud ◽  
Kiyoka Kinugawa-Bourron ◽  
Frédéric Marin
Keyword(s):  
Kinetic Energy ◽  
Inertial Measurement Unit ◽  
Measurement Unit ◽  
Inertial Measurement ◽  
Sit To Stand

scholarly journals Concurrent validity and intra-trial reliability of a bluetooth-embedded inertial measurement unit for real-time joint range of motion

2019 ◽  
Vol 18 (3) ◽  
pp. 1-11 ◽  
Author(s):  
D. Oh ◽  
W. Lim ◽  
N. Lee
Keyword(s):  
Real Time ◽  
Concurrent Validity ◽  
Inertial Measurement Unit ◽  
Correlation Coefficients ◽  
Knee Extension ◽  
Repeated Measurements ◽  
Measurement Unit ◽  
Validity And Reliability ◽  
Inertial Measurement ◽  
Performance Ability

Abstract Along with advancements in science and technology, anthropometric measurements using electronic devices have become possible, and research is being actively conducted on this topic. Recently, devices using Bluetooth that are portable because of their small size have been developed to allow real-time measurements and recording. This study investigated the concurrent validity and intra-trial reliability of a recently developed Bluetooth-embedded inertial measurement unit. Thirty-seven healthy, young adult participants (age = 22.1±1.2 years, height = 166.8±1.6 cm, mass = 61.9±12.3 kg) were included in the study. The knee extension angles during active knee extension were measured for validity, using both the Bluetooth-embedded inertial measurement unit and the standard goniometer. Intra-trial reliability was tested for consistency during repeated measurements. The intra-class correlation coefficients value for the concurrent validity between the Bluetooth-embedded inertial measurement unit and standard goniometer was 0.991, and the values for the intra-trial reliability of the two devices were 0.973 and 0.963, respectively. Based on its high validity and reliability, the Bluetooth-embedded device may be useful for evaluating functional impairment and exercise performance ability by real-time measurements of joint ranges of motion in clinical rehabilitation or sports fields.

Agreement between the inertial measurement unit and optoelectronic system to measure postural sway

2021 ◽  
pp. 1-6
Author(s):  
Alessandro Vagnini ◽  
Roberta Furone ◽  
Giulia Zanotti ◽  
Paola Adamo ◽  
Federico Temporiti ◽  
...  
Keyword(s):  
Inertial Measurement Unit ◽  
Postural Sway ◽  
Measurement Unit ◽  
Confidence Ellipse ◽  
Optoelectronic System ◽  
Inertial Measurement ◽  
Measurement Units ◽  
User Friendly ◽  
Anterior Posterior ◽  
Good Agreement

BACKGROUND: Optoelectronic systems and force platforms represent the gold standard for postural sway assessment, but pose disadvantages in terms of equipment, cost and preparation time. OBJECTIVE: Wearable inertial measurement units (IMUs) have been proposed to overcome these issues, but have never been compared to an optoelectronic system. The study aim was therefore to investigate agreement between inertial measurement unit and optoelectronic system in postural sway assessment. METHODS: Thirty healthy volunteers performed four balance tasks. IMU was placed on the sacrum (S2) with a retroreflective marker over the sensor and subjects’ performance was simultaneously recorded by both systems. Total (TOT), anterior-posterior (AP) and medial-lateral (ML) length of trace, range, speed, root mean squared (RMS), and confidence ellipse were computed. RESULTS: ICCs revealed excellent correlations for Length-TOT, Length-AP and Speed-AP, good correlation for Length-ML, Speed-ML, Confidence Ellipse, Range-AP and RMS-AP, and moderate correlation for range-ML and RMS-ML. Bland-Altman plot showed greater estimation for Length-TOT, Length-AP, Speed-AP, confidence ellipse and RMS-AP using optoelectronic system, and for Length-ML, Range-AP, Range-ML, Speed-ML, RMS-ML using IMU. Both systems revealed the same differences among tasks. CONCLUSION: The excellent to good agreement of IMU for length of trace and speed parameters and its user-friendly application suggest its potential implementations in clinical practice.

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