Differentiation of young and older adult stair climbing gait using principal component analysis.

INTRODUCTION Principal component analysis (PCA) has been used to reduce the volume of gait data and can also be used to identify the differences between populations. This approach has not been used on stair climbing gait data. Our objective was to use PCA to compare the gait patterns between young and older adults during stair climbing. METHODS The knee joint mechanics of 30 healthy young adults (23.9 + or - 2.6 years) and 32 healthy older adults (65.5 + or - 5.2 years) were analyzed while they ascended a custom 4-step staircase. The three-dimensional net knee joint forces, moments, and angles were calculated using typical inverse dynamics. PCA models were created for the knee joint forces, moments and angles about the three axes. The principal component scores (PC scores) generated from the model were analyzed for group differences using independent samples t-tests. A stepwise discriminant procedure determined which principal components (PCs) were most successful in differentiating the two groups. RESULTS The number of PCs retained for analysis was chosen using a 90% trace criterion. Of the scores generated from the PCA models nine were statistically different (p < .0019) between the two groups, four of the nine PC scores could be used to correctly classify 95% of the original group. CONCLUSIONS The PCA and discriminant function analysis applied in this investigation identified gait pattern differences between young and older adults. Identification of stair gait pattern differences between young and older adults could help in understanding age-related changes associated with the performance of the locomotor task of stair climbing.

[1]  James O. Ramsay,et al.  Functional Data Analysis , 2005 .

[2]  I. Jolliffe.  Principal Component Analysis , 2002 .

[3]  R. J. Jefferson,et al.  Functional biomechanical assessment of the Oxford Meniscal Knee. , 1989, The Journal of arthroplasty.

[4]  S. Nadeau,et al.  Frontal and sagittal plane analyses of the stair climbing task in healthy adults aged over 40 years: what are the challenges compared to level walking? , 2003, Clinical biomechanics.

[5]  J. Bryant,et al.  A quantitative approach to radiography of the lower limb. Principles and applications. , 1991, The Journal of bone and joint surgery. British volume.

[6]  K. Deluzio,et al.  Gait assessment in unicompartmental knee arthroplasty patients: Principal component modelling of gait waveforms and clinical status , 1999 .

[7]  Kevin J Deluzio,et al.  Knee and hip kinetics during normal stair climbing. , 2002, Gait & posture.

[8]  P. Riley,et al.  Biomechanical analysis of body mass transfer during stair ascent and descent of healthy subjects. , 1993, Journal of rehabilitation research and development.

[9]  D. Winter,et al.  An integrated biomechanical analysis of normal stair ascent and descent. , 1988, Journal of biomechanics.

[10]  K. Deluzio,et al.  Principal component models of knee kinematics and kinetics: Normal vs. pathological gait patterns , 1997 .

[11]  U P Wyss,et al.  A procedure to validate three-dimensional motion assessment systems. , 1993, Journal of biomechanics.

[12]  J. L. Astephen,et al.  Gait and neuromuscular pattern changes are associated with differences in knee osteoarthritis severity levels. , 2008, Journal of biomechanics.

[13]  R. Riener,et al.  Stair ascent and descent at different inclinations. , 2002, Gait & posture.

[14]  J. L. Astephen,et al.  Biomechanical features of gait waveform data associated with knee osteoarthritis: an application of principal component analysis. , 2007, Gait & posture.

[15]  V Baltzopoulos,et al.  The demands of stair descent relative to maximum capacities in elderly and young adults. , 2008, Journal of electromyography and kinesiology : official journal of the International Society of Electrophysiological Kinesiology.

[16]  S. Harrison,et al.  Applied statistical analysis , 1984 .

[17]  L. Svanström.  Falls on Stairs: an Epidemiological Accident Study , 1974, Scandinavian journal of social medicine.

[18]  T. Andriacchi,et al.  A study of lower-limb mechanics during stair-climbing. , 1980, The Journal of bone and joint surgery. American volume.

[19]  C L Vaughan,et al.  Abduction-adduction moments at the knee during stair ascent and descent. , 1996, Journal of biomechanics.

[20]  B. Silverman,et al.  Functional Data Analysis , 1997 .

[21]  H. K. Ramakrishnan,et al.  Comprehensive gait analysis in posterior-stabilized knee arthroplasty. , 1996, The Journal of arthroplasty.

[22]  J. E. Jackson.  A User's Guide to Principal Components , 1991 .

[23]  D Hemenway,et al.  The incidence of stairway injuries in Austria. , 1994, Accident; analysis and prevention.

[24]  U. P. Wyss,et al.  Semiautomatic three-dimensional knee motion assessment system , 1992, Medical and Biological Engineering and Computing.

[25]  D W Grieve,et al.  The use of neural networks to recognize patterns of human movement: gait patterns. , 1995, Clinical biomechanics.

[26]  P. Costigan,et al.  Hip moments during level walking, stair climbing, and exercise in individuals aged 55 years or older. , 1999, Physical therapy.

[27]  M. Tinetti,et al.  Risk factors for falls among elderly persons living in the community. , 1988, The New England journal of medicine.

[28]  R A Olshen,et al.  Statistical analysis of gait patterns of persons with cerebral palsy. , 2015, Statistics in medicine.

[29]  T Chau,et al.  A review of analytical techniques for gait data. Part 1: Fuzzy, statistical and fractal methods. , 2001, Gait & posture.

[30]  John A. Rice,et al.  Displaying the important features of large collections of similar curves , 1992 .

[31]  C. Powers,et al.  Lower extremity kinetics during stair ambulation in patients with and without patellofemoral pain. , 2001, Clinical biomechanics.

[32]  E S Grood,et al.  A joint coordinate system for the clinical description of three-dimensional motions: application to the knee. , 1983, Journal of biomechanical engineering.

[33]  H. Leibowitz,et al.  The influence of visual factors on fall-related kinematic variables during stair descent by older women. , 1991, Journal of gerontology.

[34]  T. Hortobágyi,et al.  Age causes a redistribution of joint torques and powers during gait. , 2000, Journal of applied physiology.

[35]  T. Andriacchi,et al.  The influence of total knee-replacement design on walking and stair-climbing. , 1982, The Journal of bone and joint surgery. American volume.

[36]  T H Reif,et al.  A numerical analysis of the backflow between the leaflets of a St Jude Medical cardiac valve prosthesis. , 1991, Journal of biomechanics.

[37]  Victoria L Chester,et al.  The identification of age-related differences in kinetic gait parameters using principal component analysis. , 2008, Clinical biomechanics.