Head and Trunk Moments of Inertia of Able-Bodied and Unbraced Scoliotic Girls

K.-C. Gan and E. R. Hoffmann (1988) demonstrated that there is a clear boundary between values of Fitts' index of difficulty (ID) below which movements may be made without ongoing path corrections; above this value it was necessary to use corrections to hit a target of high ID. It is shown that this critical ID (IDcrit) value is dependent on both the body component making the movement and on the form of feedback available to the person. The arm system, having the highest ratio of muscle strength to mass moment of inertia, has the highest value of IDcrit, whereas control of the body center of mass location has the lowest value of IDcrit. It is suggested that the use of visual control to lower ID values with the larger body components is due to the longer movement times available because of the physical characteristics of these components-the time is available, and therefore it is used to make path corrections.

show abstract

Head and Trunk Moments of Inertia of Able-Bodied and Unbraced Scoliotic Girls

Abstract: These results can be used to calculate more precise moments of force during daily activities in scoliotic girls with mild scoliosis and to improve the design of corrective flexible body braces prescribed in cases of rapid interventions in young patients of moderate spinal deformities.

Cited by 3 publications

References 42 publications

Inertia Effects in Fitts’ Law for Movement Time

Inertia Effects in Fitts’ Law for Movement Time

Effect of natural sagittal trunk lean on standing balance in untreated scoliotic girls

Critical Index of Difficulty for Different Body Motions: A Review

Contact Info

Product

Resources

About