title: Portable sensor based dynamic estimation of human oxygen uptake via nonlinear multivariable modelling.
abstract: Noninvasive portable sensors are becoming popular in biomedical engineering practice due to its ease of use. This paper investigates the estimation of human oxygen uptake (VO(2)) of treadmill exercises by using multiple portable sensors (wireless heart rate sensor and triaxial accelerometers). For this purpose, a multivariable Hammerstein model identification method is developed. Well designed PRBS type of exercises protocols are employed to decouple the identification of linear dynamics with that of nonlinearities of Hammerstein systems. The support vector machine regression is applied to model the static nonlinearities. Multivariable ARX modelling approach is used for the identification of dynamic part of the Hammerstein systems. It is observed the obtained nonlinear multivariable model can achieve better estimations compared with single input single output models. The established multivariable model has also the potential to facilitate dynamic estimation of energy expenditure for outdoor exercises, which is the next research step of this study.
authors.affiliation: Human Performance Group, Biomedical Systems Lab, School of Electrical Engineering&Telecommunications University of New South Wales, UNSW Sydney, NSW, Australia.
authors.forename: Steven W
authors.initials: SW
authors.lastname: Su
authors.forename: Branko G
authors.initials: BG
authors.lastname: Celler
authors.forename: Andrey V
authors.initials: AV
authors.lastname: Savkin
authors.forename: Hung T
authors.initials: HT
authors.lastname: Nguyen
authors.forename: Teddy M
authors.initials: TM
authors.lastname: Cheng
authors.forename: Ying
authors.initials: Y
authors.lastname: Guo
authors.forename: Lu
authors.initials: L
authors.lastname: Wang
mesh_terms: D000054:Acceleration; D000328:Adult; D000465:Algorithms; D001698:Biomedical Engineering / Q000379:methods; D015374:Biosensing Techniques / Q000295:instrumentation*; D015444:Exercise; D006339:Heart Rate; D006801:Humans; D008297:Male; D008962:Models, Theoretical; D018670:Monitoring, Ambulatory / Q000379:methods*; D015999:Multivariate Analysis; D010100:Oxygen / Q000378:metabolism / Q000493:pharmacokinetics; D010101:Oxygen Consumption / Q000502:physiology*; D012044:Regression Analysis
chemical_list: D010100:Oxygen