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Effects of low frequency vibration of a limbLow frequency oscillations were applied on the ankle joint in plantarflexion/dorsiflexion rotation using a torque motor. The torque, the angular rotation and the evoked electromyogram from the gastronemius soleus and the anterior tibial muscles were recorded. Significant nonlinearities were observed in the angular rotation from 8 to 12 Hz. The following methods are used for data analysis: (1) Two cycle averaged response; (2) Fourier transform; and (3) Fourier analysis at the driving frequency. Important observations are: (1) resonance near 6 to 8 Hz; (2) slowly increasing amplitudes of oscillation near resonance; (3) self sustaining oscillations after the motor is turned off, particularly in the fatigued limb; and (4) distortion of angular rotation during which there are spontaneous recurrences of oscillation at the driving frequency.
Document ID
19750025618
Document Type
Conference Paper
Authors
Agarwal, G. C.
(Rush-Presbyterian-St. Luke's Med. Center)
Gottlieb, G. L.
(Rush-Presbyterian-St. Luke's Med. Center)
Date Acquired
August 8, 2013
Publication Date
May 1, 1975
Publication Information
Publication: NASA. Ames Res. Center 11th Ann. Conf. on Manual Control
Subject Category
Man/System Technology And Life Support
Funding Number(s)
CONTRACT_GRANT: NSF GK-37540
CONTRACT_GRANT: RR-05477
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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IDRelationTitle19750025602Analytic PrimaryEleventh Annual Conference on Manual Control
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