Can mechanical myotonometry or electromyography be used for the prediction of intramuscular pressure?

Department of Applied Physics, University of Kuopio, POB 1627, Finland.
Physiological Measurement (Impact Factor: 1.81). 12/2005; 26(6):951-63. DOI: 10.1088/0967-3334/26/6/006
Source: PubMed


The aim of the study was to characterize the electromechanical properties of skeletal muscle during isometric loading as well as to assess the potential of estimating intramuscular pressure by electrical and mechanical methods. Simultaneous electromyography (EMG), mechanical myotonometry (MYO, frequency and decrement of decay) and intramuscular pressure (IMP) measurements were conducted at rest and during short-term and long-term isometric contractions in patients with chronic pain in the anterior leg or dorsal forearm. The EMG amplitude and MYO(freq) accounted significantly (24-73%, p < 0.0001) for the variations in the IMP under short-term isometric loading. The IMP, EMG and MYO(freq) increased linearly with the relative muscle load (r = 0.868-0.993, p < 0.05). Mean values of EMG amplitudes at the contraction levels of 75% and 100% maximum voluntary contraction (MVC) and MYO(freq) values at all contraction levels (0-100% MVC) were higher for subjects with pathological values of IMP than for those with IMP values in the normal range. Total changes in IMP and EMG amplitude during 1 min isometric contraction were linearly interrelated (r = 0.747, p < 0.0001). We conclude that both surface electromyography and myotonometry parameters are indicative of intramuscular pressure, but neither of these methods can be used alone to diagnose non-invasively chronic compartment syndrome with acceptable accuracy.

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    • "When using a Myoton device at a constant length of the skeletal muscle, the measuring device evokes a shorttime change in the muscle shape by the dosed impact that ends with a quick release and the muscle responds by natural damped oscillations (Vain, 1995). Previously a good repeatability and validity of characteristics measured by the Myoton was noted (Korhonen et al., 2005; Viir et al., 2006a). As compared to the muscle compliance measurement method (Gubler-Hanna et al., 2007), where the duration of the impact on the muscle is expressed in seconds, the present method evokes a mechanical impulse during 15 ms. "

    Full-text · Article · Nov 2015 · Proceedings of the Estonian Academy of Sciences
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