Computer programs for obtaining kinetic data on human movement

Plagenhoef, Stanley

doi:10.1016/0021-9290(68)90007-9

Cited by 23 publications

(4 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Functions which have been used are polynomials (Plagenhoef, 1968), Fourier series (Anderssen and Bloomfield, 1974;Hatze, 1981), cubic splines (Reinsch, 1967) and quintic splines (Wood and Jennings, 1979). Cubic splines have been shown to give better estimates of derivatives than polynomials (Zernicke et al, 1976) while quintic splines produce better endpoint derivatives than cubic splines and Fourier series (Wood and Jennings, 1979).…”

Section: Curve Fitting Techniquesmentioning

confidence: 99%

The simulation of aerial movement—I. The determination of orientation angles from film data

Yeadon

1990

Journal of Biomechanics

View full text Add to dashboard Cite

Quantitative mechanical analyses of human movement require the time histories of the angles which specify body configuration and orientation. When these angles are obtained from a filmed performance they may be used to evaluate the accuracy of a simulation model. This paper presents a method of determining orientation angles and their rates of change from film data. The stages used comprise the synchronisation of data obtained from two camera views, the determination of three-dimensional coordinates of joint centres, the calculation of an angle from a sequence of sine and cosine values and the curve fitting of angles using quintic splines. For each stage, other possible approaches are discussed. Original procedures are presented for obtaining individual error estimates of both the film data and the calculated angles to permit the automatic fitting of quintic splines for interpolation and differentiation and for deriving the time history of an angle as a continuous function from a sequence of sine and cosine values. The method is applied to a forward somersault with 1 1 2 twists and the average error estimate of 17 orientation angles is obtained as 2.1 degrees.

show abstract

Section: Curve Fitting Techniquesmentioning

confidence: 99%

The simulation of aerial movement—I. The determination of orientation angles from film data

Yeadon

1990

Journal of Biomechanics

View full text Add to dashboard Cite

show abstract

“…Recently, techniques have been made available which permit complete and thorough analysis of all gravitational and inertial forces acting upon selected anatomical landmarks. The use of the computer naturally expedites the lengthy computation involved (9).…”

Section: Introductionmentioning

confidence: 99%

“…We have employed the dynamic model approach, which originates from the works of Dempster (3) and Plagenhoef (9), to determine the intra-articular forces acting upon the lumbar intervertebral discs (L4-L5). By utilizing the value of the resultant inertial (and gravitational) force in estimating intervertebral stress, the logical extension of Troup's static model is accomplished.…”

Section: Introductionmentioning

confidence: 99%

A Kinetic Model of Intervertebral Stress During Lifting

Wood¹,

Hayes²

1974

Br J Sports Med

View full text Add to dashboard Cite

A biomechanical model of a simple lifting motion is presented in which the forces and moments of force acting about the L4-L5 vertebral articulation were determined from kinetic and kinematic data. Derivation of the forces due to motion permitted a unique method for estimating intervertebral stress during each phase of the lift and provided a logical extension to an earlier static model of intervertebral stress presented by Troup (13). The intervertebral force was found to have a maximum value of over 400 kg during the initial phase of the lift. By partitioning this force into its shearing and compressional components, it was possible to determine quantitatively the lumbar stress involved in lifting. The values are discussed briefly in relation to the aetiology of back injuries and some of the predictions and applications of the dynamic model are also considered.

show abstract

“…Noss (1967) made qualitative consideration of angle data affected by perspective error and recommended the use of three-dimensional measurement techniques for elimi natingthe effect on angles. For reducing the perspective error in two-dimensional data acquisition, Miller and Nelson (1973) as well as Plagenhoef (1968) recom mendedpositioning the camera as far away from the filmed objects as possible. Unfortunately, few studies have exactly quantified the effects of perspective error on kinematic variables concerning human movement.…”

mentioning

confidence: 99%

Quantification and a Simple Correction of Perspective Error in Two-Dimensional Motion Analysis of Human Movement.

Yokoi

Okada

1994

View full text Add to dashboard Cite

Computer programs for obtaining kinetic data on human movement

Cited by 23 publications

References 1 publication

The simulation of aerial movement—I. The determination of orientation angles from film data

The simulation of aerial movement—I. The determination of orientation angles from film data

A Kinetic Model of Intervertebral Stress During Lifting

Quantification and a Simple Correction of Perspective Error in Two-Dimensional Motion Analysis of Human Movement.

Contact Info

Product

Resources

About