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Limited By:	Subject = Inertial measurement units;

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Accurate Orientation Estimation Using AHRS under Conditions of Magnetic Distortion (2015)

Yadav, Nagesh; Bleakley, Chris J.

Accurate Orientation Estimation Using AHRS under Conditions of Magnetic Distortion (2015)

Yadav, Nagesh; Bleakley, Chris J.

Abstract:

Low cost, compact attitude heading reference systems (AHRS) are now being used to track human body movements in indoor environments by estimation of the 3D orientation of body segments. In many of these systems, heading estimation is achieved by monitoring the strength of the Earth’s magnetic field. However, the Earth’s magnetic field can be locally distorted due to the proximity of ferrous and/or magnetic objects. Herein, we propose a novel method for accurate 3D orientation estimation using an AHRS, comprised of an accelerometer, gyroscope and magnetometer, under conditions of magnetic field distortion. The system performs online detection and compensation for magnetic disturbances, due to, for example, the presence of ferrous objects. The magnetic distortions are detected by exploiting variations in magnetic dip angle, relative to the gravity vector, and in magnetic strength. We investigate and show the advantages of using both magnetic strength and magnetic dip angle for detecti...

http://hdl.handle.net/10197/7081

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Evaluating Performance of the Lunge Exercise with Multiple and Individual Inertial Measurement Units (2016)

Whelan, Darragh; O'Reilly, Martin; Ward, Tomás; Delahunt, Eamonn; Caulfield, Brian

Evaluating Performance of the Lunge Exercise with Multiple and Individual Inertial Measurement Units (2016)

Whelan, Darragh; O'Reilly, Martin; Ward, Tomás; Delahunt, Eamonn; Caulfield, Brian

Abstract:

Pervasive Health 2016: 10th EAI International Conference on Pervasive Computing Technologies for Healthcare, Cancun, Mexico, 16-19 May 2016
The lunge is an important component of lower limb rehabilitation, strengthening and injury risk screening. Completing the movement incorrectly alters muscle activation and increases stress on knee, hip and ankle joints. This study sought to investigate whether IMUs are capable of discriminating between correct and incorrect performance of the lunge. Eighty volunteers (57 males, 23 females, age: 24.68± 4.91 years, height: 1.75± 0.094m, body mass: 76.01±13.29kg) were fitted with five IMUs positioned on the lumbar spine, thighs and shanks. They then performed the lunge exercise with correct form and 11 specific deviations from acceptable form. Features were extracted from the labelled sensor data and used to train and evaluate random-forests classifiers. The system achieved 83% accuracy, 62% sensitivity and 90% specificity in binary classificat...

http://hdl.handle.net/10197/7876

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Technology in Rehabilitation: Comparing Personalised and Global Classification Methodologies in Evaluating the Squat Exercise with Wearable IMUs (2019)

Whelan, Darragh; O'Reilly, Martin; Ward, Toms; Delahunt, Eamonn; Caulfield, Brian

Technology in Rehabilitation: Comparing Personalised and Global Classification Methodologies in Evaluating the Squat Exercise with Wearable IMUs (2019)

Whelan, Darragh; O'Reilly, Martin; Ward, Toms; Delahunt, Eamonn; Caulfield, Brian

Abstract:

BACKGROUND: The barbell squat is a popularly used lower limb rehabilitation exercise. It is also an integral exercise in injury risk screening protocols. To date athlete/patient technique has been assessed using expensive laboratory equipment or subjective clinical judgement; both of which are not without shortcomings. Inertial measurement units (IMUs) may offer a low cost solution for the objective evaluation of athlete/patient technique. However, it is not yet known if global classification techniques are effective in identifying naturally occurring, minor deviations in barbell squat technique.OBJECTIVES: The aims of this study were to: (a) determine if in combination or in isolation, IMUs positioned on the lumbar spine, thigh and shank are capable of distinguishing between acceptable and aberrant barbell squat technique; (b) determine the capabilities of an IMU system at identifying specific natural deviations from acceptable barbell squat technique; and (c) compare a personalise...

http://hdl.handle.net/10197/10885

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Technology in Rehabilitation: Evaluating the Single Leg Squat Exercise with Wearable Inertial Measurement Units (2017)

O'Reilly, Martin; Ward, Tomás; Delahunt, Eamonn; Caulfield, Brian

Technology in Rehabilitation: Evaluating the Single Leg Squat Exercise with Wearable Inertial Measurement Units (2017)

O'Reilly, Martin; Ward, Tomás; Delahunt, Eamonn; Caulfield, Brian

Abstract:

Background: The single leg squat (SLS) is a common lower limb rehabilitation exercise. It is also frequently used as an evaluative exercise to screen for an increased risk of lower limb injury. To date athlete / patient SLS technique has been assessed using expensive laboratory equipment or subjective clinical judgement; both of which are not without shortcomings. Inertial measurement units (IMUs) may offer a low cost solution for the objective evaluation of athlete / patient SLS technique. Objectives: The aims of this study were to determine if in combination or in isolation IMUs positioned on the lumbar spine, thigh and shank are capable of: (a) distinguishing between acceptable and aberrant SLS technique; (b) identifying specific deviations from acceptable SLS technique. Methods: Eighty-three healthy volunteers participated (60 males, 23 females, age: 24.68 + / − 4.91 years, height: 1.75 + / − 0.09 m, body mass: 76.01 + / − 13.29 kg). All participants performed 10 SLSs on their l...

http://hdl.handle.net/10197/8549

Displaying Results 1 - 4 of 4 on page 1 of 1