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Gewählte Publikation:

Gallasch, E; Kenner, T.
Characterisation of arm microvibration recorded on an accelerometer.
Eur J Appl Physiol Occup Physiol. 1997; 75(3):226-232
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Autor/innen der Med Uni Graz:
Gallasch Eugen
Kenner Thomas
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Abstract:
Microvibration (MV) of the freely hanging and firmly supported lower arm was studied (n = 8) using two accelerometers, one located over muscle tissue (brachioradialis muscle) and one over bony tissue (processus styloideus). Measurements were made in the completely relaxed arm (REST), during arterial occlusion (CUFF) and during mild handgrip (GRIP), first with the arm relaxed and hanging beside the chair and then repeated with the arm supported in a special rest. At REST. ballistocardiac forces were identified as the driving mechanism for the regular MV pattern, whereas actions of local pulse waves (CUFF) could be excluded. During GRIP irregular MV, related to the contraction process, became superimposed on both signals. The MV at REST was sensitive to arm position. In the freely hanging state, when the arm was family coupled to the trunk, ballistocardiac body motion was present over bony tissue, producing a low damped 7-13 Hz resonant response over muscle tissue. In the supported state, the arm became isolated from body motions. Nevertheless, ballistocardiac forces reached the arm, producing smaller oscillatory responses over bone and muscle tissue. Regionally produced MV (GRIP) was not sensitive to arm position, but the spectrum content in the 7-13 Hz region was very similar to REST. From these results it would appear, that a low damped 7-13 Hz resonance process exists in relaxed muscle tissue, which physiologically becomes stimulated by cardiac and muscle forces. From the close relationship of the simultaneous MV waveforms in the supported arm, evidence for mechanical coupling between bone and muscle tissue is given.
Find related publications in this database (using NLM MeSH Indexing)
Adult -
Arm -
Arteries -
Biomechanics -
Bone and Bones - physiology
Constriction - physiology
Electrocardiography - physiology
Female - physiology
Hand Strength - physiology
Humans - physiology
Male - physiology
Muscle Contraction - physiology
Muscle Relaxation - physiology
Muscle, Skeletal - blood supply
Vibration - blood supply

Find related publications in this database (Keywords)
Ballistocardiac Motion
Relaxed Muscle
Resonance Properties
Mild Handgrip
Muscle Sound
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