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  • 1
    Electronic Resource
    Electronic Resource
    Estimation of muscle force from intramuscular total pressure (1984)
    Springer
    Medical & biological engineering & computing 22 (1984), S. 453-457 
    Details
    ISSN: 1741-0444
    Keywords: Estimation ; Fatigue ; Force ; Intramuscular pressure ; Muscle ; Myoelectric
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract Estimation of muscle force from the root mean square value of the myoelectric signal is limited to nonfatiguing contractions because of the change in the signal value that occurs with fatigue. In this paper the total intramuscular pressure is proposed as a muscle force estimator. Using a catheter, intramuscular pressure was measured for isometric time-varying force contractions and compared with the myoelectric signal mean absolute value. Results show that the pressure provides a linear estimator for load with an estimation error which is less than that obtained from the myoelectric signal. The myoelectric load estimator changes with fatigue but there is no significant change in the pressure load estimator.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02447706
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The relation between spectral changes of the myoelectric signal and the intramuscular pressure of human skeletal muscle (1984)
    Springer
    European journal of applied physiology 52 (1984), S. 202-206 
    Details
    ISSN: 1439-6327
    Keywords: EMG ; Localized muscular fatigue ; Spectral changes ; Intramuscular pressure ; Ergonomics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The purpose of the present study was to investigate if the intramuscular pressure generated during an isometric muscle contraction is important for the appearance of EMG spectral changes accompanying localized muscular fatigue. The EMG and intramuscular pressure of the left biceps brachii in eight volunteers were recorded during standardized isometric contractions by means of intramuscular wire electrodes and infusion catheters, respectively. Spectral changes were elicited by a submaximal contraction and the intramuscular pressure at which the induced spectral changes were able to recover was determined. It was found that significant recovery was possible only if the intramuscular pressure dropped below a level of about 2.7 kPa (20 mm Hg). It is concluded that the intramuscular pressure during a sustained isometric contraction is relevant for the generation of fatigue induced spectral changes, and that measurement of the intramuscular pressure makes possible predetermination of whether or not an isometric muscle contraction is liable to result in localized muscular fatigue.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00433393
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Relation of intramuscular pressure to the force output and myoelectric signal of skeletal muscle (1984)
    Hoboken, NJ [u.a.] : Wiley-Blackwell
    Journal of Orthopaedic Research 2 (1984), S. 289-296 
    Details
    ISSN: 0736-0266
    Keywords: Intramuscular pressure ; EMG ; Muscle force ; Biomechanic models ; Life and Medical Sciences
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: The force output of the biceps brachii muscle during static isometric contractions was studied in 26 arms of 23 subjects in relation to the simultaneously recorded level of the electromyogram (EMG) and the intramuscular pressure (IMP). The EMG was picked up with wire electrodes and the IMP recorded through wick catheters or by infusion technique. The load at the wrist was monitored using a force transducer. A near linear relationship with correlation coefficients exceeding 0.96 was shown between the load on the wrist on the one hand and IMP and EMG on the other. The regression coefficients of the relation between the load and IMP or EMG varied considerably between individuals and between different measuring points in the same individual. In cases where the correlation between the wrist load on one hand and the IMP and EMG on the other was poor because of varying synergistic interaction between the flexor muscles, the EMG and IMP were always well correlated. This means that they change in the same way when the mechanical output of the muscle varies. This was also the case in three experiments where the IMP and EMG from all three elbow flexors were recorded while the subjects changed from a supinated to a pronated position supporting a constant load on the wrist. Considering these observations we present indirect evidence that IMP and the level of the EMG signal both are good estimators of isolated muscular force under isometric static conditions and over limited time.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jor.1100020311
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    Paper (German National Licenses)
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