Comparison of inertial records during anticipatory postural adjustments obtained with devices of different masses

PeerJ

article

Anderson Antunes da Costa Moraes¹  Manuela Brito Duarte¹  Eduardo Veloso Ferreira¹  Gizele Cristina da Silva Almeida¹  André dos Santos Cabral²  Anselmo de Athayde Costa e Silva³  Daniela Rosa Garcez⁴  Givago Silva Souza⁵  Bianca Callegari¹ 

[1] Laboratory of Human Motricity Studies, Federal University of Para;Center of Biological Science, State University of Para;Post Graduation Program in Human Movement Sciences, Federal University of Para;University Hospital Bettina Ferro de Souza, Federal University of Para;Nucleous of Tropical Medicine, Federal University of Para;Institute of Biological Science, Federal University of Para

关键词: Wireless triaxial accelerometer;    Postural adjustment assessments;    Gait initiation;    IMU;    Step initiation;    Anticipatory postural adjustments;   

DOI  :  10.7717/peerj.15627

学科分类：社会科学、人文和艺术（综合）

来源: Inra

【 摘 要 】

Background Step initiation involves anticipatory postural adjustments (APAs) that can be measured using inertial measurement units (IMUs) such as accelerometers. However, previous research has shown heterogeneity in terms of the population studied, sensors used, and methods employed. Validity against gold standard measurements was only found in some studies, and the weight of the sensors varied from 10 to 110 g. The weight of the device is a crucial factor to consider when assessing APAs, as APAs exhibit significantly lower magnitudes and are characterized by discrete oscillations in acceleration paths. Objective This study aims to validate the performance of a commercially available ultra-light sensor weighing only 5.6 g compared to a 168-g smartphone for measuring APAs during step initiation, using a video capture kinematics system as the gold standard. The hypothesis is that APA oscillation measurements obtained with the ultra-light sensor will exhibit greater similarity to those acquired using video capture than those obtained using a smartphone. Materials and Methods Twenty subjects were evaluated using a commercial lightweight MetaMotionC accelerometer, a smartphone and a system of cameras—kinematics with a reflective marker on lumbar vertebrae. The subjects initiated 10 trials of gait after a randomized command from the experimenter and APA variables were extracted: APAonset, APAamp, PEAKtime. A repeated measures ANOVA with post-hoc test analyzed the effect of device on APA measurements. Bland–Altman plots were used to evaluate agreement between MetaMotionC, smartphone, and kinematics measurements. Pearson’s correlation coefficients were used to assess device correlation. Percentage error was calculated for each inertial sensor against kinematics. A paired Student’s t-test compared th devices percentage error. Results The study found no significant difference in temporal variables APAonset and PEAKtime between MetaMotionC, smartphone, and kinematic instruments, but a significant difference for variable APAamp, with MetaMotionC yielding smaller measurements. The MetaMotionC had a near-perfect correlation with kinematic data in APAonset and APAamp, while the smartphone had a very large correlation in APAamp and a near-perfect correlation in APAonset and PEAKtime. Bland–Altman plots showed non-significant bias between smartphone and kinematics for all variables, while there was a significant bias between MetaMotionC and kinematics for APAamp. The percentage of relative error was not significantly different between the smartphone and MetaMotionC. Conclusions The temporal analysis can be assessed using ultralight sensors and smartphones, as MetaMotionC and smartphone-based measurements have been found to be valid compared to kinematics. However, caution should be exercised when using ultralight sensors for amplitude measurements, as additional research is necessary to determine their effectiveness in this regard.

【 授权许可】

CC BY