# A MULTIVARIATE STATISTICAL ANALYSIS OF MUSCULAR BIOPOTENTIAL FOR HUMAN ARM MOVEMENT CHARACTERIZATION

### Giuliano Alves da Silva, Maria Cláudia Ferrari de Castro, Carlos Eduardo Thomaz

#### Abstract

Pattern recognition of electromyographic signals consists of a hard task due to the high dimensionality of the data and noise presence on the acquired signals. This work intends to study the data set as a multivariate pattern recognition problem by applying linear transformations to reduce the data dimensionality. Five volunteers contributed in a previous experiment that acquired the myoelectrical signals using surface electrodes. Attempts to analyse the groups of acquired data by means of descriptive statistics have shown to be inconclusive. This works shows that the use of multivariate statistical techniques such as Principal Components Analysis (PCA) and Maximum uncertainty Linear Discriminant Analysis (MLDA) to characterize the acquired set of signals through low dimensional scatter plots provides a new understanding of the data spread, making easier its analysis. Considering the arm horizontal movement and the acquired set of data used in this research, a multivariate linear separation between the patterns of interest quantified by the distance of Bhattacharyya suggests that it’s possible not only to characterize the angular joint position, but also to confirm that different movements recruit similar amounts of energy to be executed.

#### References

- Bittar, L. M. and Castro, M. C. F., 2008. Elbow Flexion and Extension Movements Characterization by Means of EMG. Biodevices 2008, Portugal, pp. 147-150.
- Fukunaga, K., 1990. Introduction to statistical pattern recognition, 2nd edition. Academic Press, Boston.
- Hargrove, L., Englehart, K. and Hudgins, B., 2008. A training strategy to reduce classification degradation due to electrode displacements in pattern recognition based myoeletric control. Biomedical Signal Processing and Control, 3(2), pp.175-180.
- Henneberg, K., 2000. Principles of Electromyography. In: Bronzino, J. D. (Eds.), The biomedical Engineering Handbook, Vol. 1, 2nd edition. CRC Press, New York. cap. 14.
- Jain, A. K. and Chandrasekaran, B., 1982, Dimensionality and Sample Size Considerations in Pattern Recognition Practice. In: Krishnaiah, P. R. and Kanal, L. N. (Eds.), Handbook of Statistics, Vol. 2. Northholland, Amsterdam. pp. 835-855.
- Kleissen, R. F. M., Buurke, J. H., Harlaar, J., Zivold, G. , 1998. Electromyography in the biomechanical analysis of human movement and its clinical application. Gait and Posture, 8(2), pp.143-158.
- Thomaz, C. E. and Gillies, D. F., 2005. A Maximum Uncertainty LDA-based approach for Limited Sample Size problems - with application to Face Recognition. In: Proceedings of SIBGRAPI'05, IEEE CS Press, pp. 89-96.
- Thomaz, C. E., Gillies, D. F. and Feitosa, R. Q., 2004. A New Covariance Estimate for Bayesian Classifiers in Biometric Recognition, IEEE Trans. Circuits Syst. Video Techn., 14(2), pp. 214-223.

#### Paper Citation

#### in Harvard Style

Silva G., Castro M. and Thomaz C. (2009). **A MULTIVARIATE STATISTICAL ANALYSIS OF MUSCULAR BIOPOTENTIAL FOR HUMAN ARM MOVEMENT CHARACTERIZATION** . In *Proceedings of the International Conference on Bio-inspired Systems and Signal Processing - Volume 1: BIOSIGNALS, (BIOSTEC 2009)* ISBN 978-989-8111-65-4, pages 227-232. DOI: 10.5220/0001433802270232

#### in Bibtex Style

@conference{biosignals09,

author={Giuliano Alves da Silva and Maria Cláudia Ferrari de Castro and Carlos Eduardo Thomaz},

title={A MULTIVARIATE STATISTICAL ANALYSIS OF MUSCULAR BIOPOTENTIAL FOR HUMAN ARM MOVEMENT CHARACTERIZATION},

booktitle={Proceedings of the International Conference on Bio-inspired Systems and Signal Processing - Volume 1: BIOSIGNALS, (BIOSTEC 2009)},

year={2009},

pages={227-232},

publisher={SciTePress},

organization={INSTICC},

doi={10.5220/0001433802270232},

isbn={978-989-8111-65-4},

}

#### in EndNote Style

TY - CONF

JO - Proceedings of the International Conference on Bio-inspired Systems and Signal Processing - Volume 1: BIOSIGNALS, (BIOSTEC 2009)

TI - A MULTIVARIATE STATISTICAL ANALYSIS OF MUSCULAR BIOPOTENTIAL FOR HUMAN ARM MOVEMENT CHARACTERIZATION

SN - 978-989-8111-65-4

AU - Silva G.

AU - Castro M.

AU - Thomaz C.

PY - 2009

SP - 227

EP - 232

DO - 10.5220/0001433802270232