Medizinische Universität Graz Austria/Österreich - Forschungsportal - Medical University of Graz
Gewählte Publikation:
Gallasch, E; Kenner, T; Haidmayer, R; Litscher, G; Pfurtscheller, G.
Sleep state dependent effects on microvibration and muscle tone in infants
EEG-EMG-Z ELEKTROENZ ELEKTROM. 1997; 28(1): 23-28.
Doi: 10.1055/s-2008-1060149
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- Führende Autor*innen der Med Uni Graz
- Gallasch Eugen
- Co-Autor*innen der Med Uni Graz
- Kenner Thomas
- Litscher Gerhard
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- Abstract:
- The effect of quiet (NREM) and active (REM) sleep on accelerometric recorded hand microvibration was studied in infants (N = 10) at the age of 2, 6, and 12 months. Additionally to microvibration, masseter surface EMG as a measure of resting muscle tone, electrocardiogram as a measure of cardiac activity, and EEG for estimation of sleep state were recorded in a whole-night polysomnography. Root mean square amplitudes of microvibration were calculated in the frequency bands of 3-7 Hz (B1), 7 - 13 Hz (B2) and 13 - 30 Hz (B3). Additionally, mean frequency of microvibration, integrated EMG and heart rate were calculated. In quiet sleep the microvibration signal clearly shows the mechanical action of the heart beat followed by a complex oscillatory component. In active sleep, both, action of the heart beat and the oscillatory component was reduced (Fig. 1, 2). This was expressed by a decrease of B2 (- 15%), B1, B2 and mean frequency of microvibration remained unchanged (Fig.4). Integrated EMG was decreased (- 10%) and heart rate was not significantly increased in active sleep (Fig. 3, 5). Further B1, B2, B3 and heart rate decreased with age, no effect was found with sleep duration. From these results it was concluded that reduction of elastic coupling in the musculoskeletal system (= mucle tone) is responsible for the reduction of the 7 - 13 Hz component of microvibration during active sleep. On the one hand reduction of muscle tone reduces transmission of cardiac impulses to distal parts of the body, and on the other hand musculoskeletal resonances which were excited by the heart beat became more damped. Other factors contributing to microvibration, like resonance properties of the wrist joint and of the skin-transducer are discussed. The parallel decrease of microvibration and heart rate with age, indicates that microvibration depends on heart rate too.
- Find related publications in this database (Keywords)
- musculoskeletal stiffness
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