Determination of Body Segment Parameters

Contini, Renato; Drillis, Rudolfs J.; Bluestein, Maurice

doi:10.1177/001872086300500508

Cited by 57 publications

(30 citation statements)

References 4 publications

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“…Mass of the prosthesis was measured using a standard laboratory scale with a capacity of 10 kg and sensitivity to the nearest gram. A reaction board technique [19][20][21][22] was used to measure the prosthesis center of mass, and an oscillation technique [23][24][25] was used to estimate prosthesis moment of inertia about a series of transverse axes. The prosthesis was secured inside an adjustable aluminum frame (mass = 1.85 kg) with the sagittal plane of the prosthesis oriented perpendicular to the oscillation axis of the frame (see Figure 1).…”

Section: Segment Inertial Propertiesmentioning

confidence: 99%

Effects of Prosthetic Mass Distribution on Metabolic Costs and Walking Symmetry

Smith

Martin²

2013

Journal of Applied Biomechanics

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Unilateral, transtibial amputees exhibit walking asymmetries and higher metabolic costs of walking than nonamputees walking at similar speeds. Using lightweight prostheses has previously been suggested as a contributing factor to walking asymmetries. The purpose was to investigate the effects of prosthesis mass and mass distribution on metabolic costs and walking asymmetries among six unilateral, transtibial amputees. Kinematic and temporal symmetry did not improve when mass was added at different locations on the limb. Stance and swing time asymmetries increased by 3.4% and 7.2%, respectively, with loads positioned distally on the limb. Maximum knee angular velocity asymmetries increased by 6% with mass added to the thigh, whereas maximum thigh angular velocity asymmetries increased by approximately 10% with mass positioned near the prosthetic ankle. Adding 100% of the estimated mass difference between intact and prosthetic legs to the ankle of the prosthesis increased energy costs of walking by 12%; adding the same mass to the prosthesis center of mass or thigh center of mass increased metabolic cost by approximately 7% and 5%, respectively. Unless other benefits are gained by increasing prosthesis mass, this should not be considered as a possible alternative to current lightweight prosthesis designs currently being prescribed to unilateral amputees.

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Section: Segment Inertial Propertiesmentioning

confidence: 99%

Effects of Prosthetic Mass Distribution on Metabolic Costs and Walking Symmetry

Smith

Martin²

2013

Journal of Applied Biomechanics

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“…This may be due to the different use of the body when reaching with two hands, for the work cost is not attributable entirely to the weight of the load but also to the weight of the part of the body used. Of female body weight, the upper arm averages 5.2 percent, the forearm 3.6 percent, the hands 1.1 percent, the thighs 25.1 percent, the shanks 9.5 percent, and the feet 2.6 percent (Contini, Drillis, and Bluestein, 1963). The average weight for the subjects in tliis study was 128 pounds; therefore their upper arms weighed an aver-…”

Section: Relation Of Extra Heart Beat Per Minute To Kilocalories Per mentioning

confidence: 83%

Extra heart beats as a measurement of work cost

Agan¹,

Konz²,

Tormey³

1974

Applied Ergonomics

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“…Currently used methods for estimating inertia (Contini et al 1963;Hinrichs 1985;Jensen 1978) and viscosity (Lacquaniti et al 1982) are rather crude, and little is known about their accuracy. Discrepancies between model predictions and experimental data may therefore be the result of an inaccurate model or inaccurate parameter estimates.…”

Section: Discussionmentioning

confidence: 99%

Invariant characteristics of horizontal-plane minimum-torque-change movements with one mechanical degree of freedom

Engelbrecht

Fernández

1997

Biological Cybernetics

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Uno et al. (1989) suggested that movements are organized such that the squared change of torque is minimized over time. Although influential, this theory has attracted much less attention from experimental researchers than the competing minimum-jerk model (Flash and Hogan 1985). One reason for this relative neglect has been the lack of general quantitative predictions, which results from the belief that minimum-torquechange trajectories have to be computed numerically for individual movements and arm-dynamical parameters. In the present paper, we show that for an important special case, that of planar horizontal movements with one mechanical degree of freedom (DOF), it is actually possible to find an analytic expression for the predicted minimum-torque-change trajectories. Based on this mathematical result, we derive a set of properties which are characteristic of these trajectories and compare them to experimental data which have not previously been related to the minimum-torque-change model. Certain discrepancies between these experimental data and minimum-torque-change model predictions are revealed.

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Determination of Body Segment Parameters

Cited by 57 publications

References 4 publications

Effects of Prosthetic Mass Distribution on Metabolic Costs and Walking Symmetry

Effects of Prosthetic Mass Distribution on Metabolic Costs and Walking Symmetry

Extra heart beats as a measurement of work cost

Invariant characteristics of horizontal-plane minimum-torque-change movements with one mechanical degree of freedom

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