Journal Article


Brian Caulfield
Eamonn Delahunt
Tomas E Ward
Darragh F Whelan
Martin A O'Reilly



biomechanics individual binary classification inertial measurement classification decision trees lumbar spine time frequency domain

Classification of lunge biomechanics with multiple and individual inertial measurement units. (2017)

Abstract Lunges are a common, compound lower limb resistance exercise. If completed with aberrant technique, the increased stress on the joints used may increase risk of injury. This study sought to first investigate the ability of inertial measurement units (IMUs), when used in isolation and combination, to (a) classify acceptable and aberrant lunge technique (b) classify exact deviations in lunge technique. We then sought to investigate the most important features and establish the minimum number of top-ranked features and decision trees that are needed to maintain maximal system classification efficacy. Eighty volunteers performed the lunge with acceptable form and 11 deviations. Five IMUs positioned on the lumbar spine, thighs, and shanks recorded these movements. Time and frequency domain features were extracted from the IMU data and used to train and test a variety of classifiers. A single-IMU system achieved 83% accuracy, 62% sensitivity, and 90% specificity in binary classification and a five-IMU system achieved 90% accuracy, 80% sensitivity, and 92% specificity. A five-IMU set-up can also detect specific deviations with 70% accuracy. System efficiency was improved and classification quality was maintained when using only 20% of the top-ranked features for training and testing classifiers.
Collections Ireland -> Maynooth University -> PubMed

Full list of authors on original publication

Brian Caulfield, Eamonn Delahunt, Tomas E Ward, Darragh F Whelan, Martin A O'Reilly

Experts in our system

Brian Caulfield
University College Dublin
Total Publications: 273
Eamonn Delahunt
University College Dublin
Total Publications: 115
Tomas Ward
Maynooth University
Total Publications: 177
Darragh Whelan
Maynooth University
Total Publications: 14
Martin O'Reilly
University College Dublin
Total Publications: 18