EP0914058A1 - Appareil de retroaction electromyographique pour entrainement a la relaxation - Google Patents

Appareil de retroaction electromyographique pour entrainement a la relaxation

Info

Publication number
EP0914058A1
EP0914058A1 EP98928132A EP98928132A EP0914058A1 EP 0914058 A1 EP0914058 A1 EP 0914058A1 EP 98928132 A EP98928132 A EP 98928132A EP 98928132 A EP98928132 A EP 98928132A EP 0914058 A1 EP0914058 A1 EP 0914058A1
Authority
EP
European Patent Office
Prior art keywords
emg
biofeedback device
frequency
signal
signals
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP98928132A
Other languages
German (de)
English (en)
Inventor
Alexander Sokolnitzky
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0914058A1 publication Critical patent/EP0914058A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/48—Other medical applications
    • A61B5/486—Bio-feedback
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
    • A61B5/316—Modalities, i.e. specific diagnostic methods
    • A61B5/389—Electromyography [EMG]

Definitions

  • the invention relates to an electromyography biofeedback device for relaxation training according to the preamble of claim 1.
  • biofeedback device biological body signals from the body of a test person are recorded with suitable sensors, electrodes or other suitable methods, processed in a device and reported back to the test person in a suitable manner as feedback information (feedback).
  • Electromyography (EMG) biofeedback devices are among the most common biofeedback arrangements. The purpose of these EMG biofeedback devices is either to learn or relearn muscle activities or to learn to relax muscles.
  • the device according to the registration is optimized for relaxation training.
  • the field of application of relaxation training according to the EMG biofeedback method basically coincides with that of autogenic training (AT) or with other relaxation techniques.
  • either an optical or an acoustic signal can be used as feedback information.
  • an acoustic signal is preferred as feedback information.
  • the change in the tone frequency serves as a relative yardstick for a change in the state of relaxation: if the EMG level drops with increasing relaxation, the frequency of the acoustic feedback signal drops. Conversely, when the EMG level increases, the frequency of the feedback signal also increases. If the EMG level remains unchanged, the feedback frequency remains unchanged.
  • Relaxation training is effective when the frequency of the feedback signal reacts strongly to a given change in the EMG level, because it can detect small changes in the EMG level.
  • the frequency of the feedback signal must be limited towards the higher range because a high-frequency feedback signal runs counter to effective relaxation.
  • the frequency range is determined by the behavior of the human ear. The effective frequency range for the feedback signal is therefore relatively small.
  • EMG levels usually occur during relaxation training. As a result, the frequency range of the feedback signal is exceeded or undershot.
  • An adaptation to the existing EMG level is usually accomplished by adjusting the sensitivity (the amplification factor) of the EMG biofeedback device accordingly.
  • the adjustment of the reinforcement is called “shaping procedure" in English.
  • Biofeedback devices with a “shaping procedure” enable very effective relaxation training, but they have the disadvantage in clinical use that the constant presence of a therapist is required to adjust the sensitivity control according to the course of the training. Adjusting the sensitivity controller also represents a disturbance in the course of the training.
  • a device for biofeedback training is known from DE 41 39 241 C2, in which the patient can carry out therapy locally, independently of the doctor, in that a patient device programmable by the doctor can be connected to a doctor or diagnostic device.
  • An acoustic signal generator emits an acoustic signal with increasing or decreasing frequency proportional to the measured values (actual values) as well as further signals which prompt the patient to maintain the desired value when a certain desired value is reached.
  • the acoustic feedback information does not consist of a single feedback signal, but is composed of a number of several overlapping feedback signals, suitable feedback information is available for relaxation training for the entire useful range of the EMG biofeedback device.
  • the individual feedback signals are based on a common frequency of a voltage-to-frequency converter (VCO), which is controlled by the derived and processed EMG signal.
  • VCO voltage-to-frequency converter
  • the frequency spacing of the feedback signals is fixed and results in a harmonic sound in the sense of harmony. If the EMG level is changed, the basic frequency and consequently all feedback signals are changed by the same factor. The harmony is thus preserved.
  • one of the feedback signals may exceed or fall short of the optimal hearing range, but a different feedback signal enters the hearing range due to the frequency cascading process .
  • the transition from one feedback signal to the other is smooth.
  • the overlap of the individual feedback signals is sufficiently designed so that the transitions are hardly or not at all perceptible to the test person.
  • the feedback signals have a triangular shape, which is obtained from the square frequencies by integration. Their amplitude is therefore strongly frequency-dependent. To avoid overdriving at low frequencies, the audio frequency is switched off automatically below a set frequency.
  • the VCO is slightly frequency modulated.
  • a large area of application for EMG biofeedback devices is muscular tension in the neck and shoulder area, caused e.g. from VDU work, from stress or from a cervical spine (cervical spine) syndrome, also known as whiplash.
  • the frontalis lead derives the electrical activity of the striated skeletal muscles of a large part of the head area, the muscles of the neck and shoulders are only recorded to a small extent with this lead.
  • the therapist will instruct the subject to focus his awareness on his problem areas (e.g. neck and shoulder areas) in order to achieve relaxation in these areas.
  • problem areas e.g. neck and shoulder areas
  • the EMG biofeedback device is designed in accordance with the invention in such a way that relaxation training can take place without the guidance of a therapist, a possibility had to be created to include muscle regions in the relaxation training that are distant from the frontalis lead. This was accomplished by capturing and taking into account other muscle regions through additional signal derivations.
  • Each of the additional leads is led to its own input amplifier, which is designed as a differential amplifier.
  • the output signals of the input amplifiers are added in a sum amplifier and processed as a sum.
  • the signals of the additional leads must not be added to the frontalis lead in the same amplification factor if an optimum of relaxation training is to be achieved; They have to be weakened more or less.
  • Fig. 1 is a block diagram of the EMG biofeeback device
  • Fig. 2 in a simplified circuit diagram, the circuit arrangement between VCO and sum circuit
  • Fig. 3 shows the arrangement of a possible second derivative
  • FIG. 4 is a block diagram of double derivative signal amplifiers As FIG. 1 shows, 1 is a differential amplifier for the EMG signal derived from the skin surface by means of electrodes.
  • the differential amplifier has a gain factor of 1000 and is characterized by a high common mode rejection.
  • the signal amplifier is installed as an electrode head in its own housing and is permanently connected to the basic unit by a cable. It is equipped with special sockets for receiving patient cables.
  • the signal from the signal amplifier passes through a high-pass filter 3, an amplifier 4 and a low-pass filter 5.
  • Filters 3 and 5 determine the frequency range of the derived EMG signal. In contrast to what is shown in FIG. 1, low and high pass filters are combined with amplifiers in practice.
  • the signal After amplification and filtering, the signal is rectified in a rectifier 6 and sieved in a low-pass filter 7.
  • the digital voltage signal generated in this way is displayed in a digital display 8 and is largely proportional to the differential signal at the inputs of the differential amplifier 1.
  • the device is equipped with a minimum detector 9 in the form of a sample and hold circuit. With this circuit arrangement, it is possible to record and store the EMG minimum achieved during relaxation training.
  • the display • the 'minimal EMG amount takes place in a digital display 10th In principle, it is possible to use only a single digital display instead of the two digital displays 8 and 10.
  • the current EMG level is constantly displayed and the stored minimum value is queried by pressing a button.
  • the minimum detector 9 is automatically reset after switching on the device. It can also be reset manually.
  • a voltage-to-frequency converter (VCO) 11 converts the DC voltage into a square-wave signal.
  • the converter has a large frequency swing and covers the useful area of the biofeedback device.
  • the square-wave signal is divided in a subsequent binary frequency divider 12.
  • the design of the VCO 11 with a large frequency swing and the subsequent frequency division are an integral part of the circuit arrangement. Due to the large frequency swing of the VCO and the subsequent frequency division, sound frequencies are available over the entire useful range of the biofeedback device that are within the hearing range of the human ear.
  • the circuit arrangement for frequency detection is equipped with a hysteresis in order to avoid uncontrolled switching at the critical frequency.
  • the triangular signals are added in a sum amplifier 14 and form frequency cascades as acoustic feedback from the biofeedback device.
  • the frequency of the VCO 11 is modulated by a small amount by changing one of the frequency-determining components, which contributes to a more pleasant feedback tone.
  • a muting 15A and 15B detects major fluctuations in the rectified signal, for example when swallowing, speaking, clearing the throat and switches off the acoustic feedback. For the duration of this shutdown, a replacement tone is generated that differs significantly from acoustic feedback. The replacement tone is used to indicate that the biofeedback device is not switched off, but is in operation.
  • the feedback signal or the substitute tone is amplified in a loudspeaker amplifier 16. The volume can be adjusted as required using a volume control.
  • a loudspeaker 17 emits the feedback signal or the substitute tone.
  • the biofeedback device is equipped with two headphone jacks, which are designed as switching jacks.
  • the loudspeaker is switched off when one or both headphones are plugged in.
  • the DC voltage signal in the VCO 11 is converted into a square-wave signal.
  • the frequency divider 12 divides the square-wave signal by a factor of 2, namely from 2 to
  • the individual frequencies of the frequency cascade must be one
  • the factor 2 represents a frequency spacing of two octaves. The demand for harmony is thus met.
  • the rectangle as a frequency form acts aggressively and is therefore unsuitable for feedback information. Therefore, the square wave signals 2o to 2 i? in the real • device
  • Signal converter 13 converted by integration into triangular signals.
  • the low frequencies below a defined frequency are switched off.
  • the frequency detection for the switch is carried out with the aid of a discriminator 18
  • the adder 14 sums all seven individual signals.
  • the sum signal represents the desired feedback information.
  • Figure 3 shows the embodiment of an additional derivative on the shoulders. The electrodes for the additional signal derivation should be applied at the therapist's choice.
  • the second (and all other leads) use two active electrodes.
  • 1A is the differential amplifier for the first derivative and IB is the differential amplifier for the second derivative.
  • the reference point of the first derivative also applies to the second derivative.
  • the inputs of 1A are connected directly to the electrode inputs, while the inputs of IB can be connected to the electrode inputs or to signal earth using a switch.
  • the connection of unused amplifier inputs against signal earth serves to avoid interference.
  • the signals from amplifiers 1A and IB are added in amplifier 2.
  • the signal from the amplifier IB is attenuated by a factor of 4 to 5 compared to the signal from the amplifier 1A.
  • FIGS. 1A and IB can, as shown in FIG. 4, be in a fixed relationship to one another or can be of variable design.
  • This arrangement allows both single derivation (eg only Frontalis derivation) and double derivation (eg Frontalis derivation plus signal derivation from the shoulders or other problem areas).

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  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Medical Informatics (AREA)
  • Biophysics (AREA)
  • Pathology (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Veterinary Medicine (AREA)
  • Physics & Mathematics (AREA)
  • Molecular Biology (AREA)
  • Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Rehabilitation Tools (AREA)

Abstract

L'invention concerne un appareil de rétroaction électromyographique pour l'entraînement à la relaxation, et un procédé avec un système de rétroaction acoustique. Cet appareil est conçu de sorte que, pendant la totalité de l'entraînement, aucun paramètre de l'appareil ne doit être réajusté, et la présence en permanence d'un thérapeute n'est pas nécessaire. Plusieurs signaux de rétroaction acoustiques, se chevauchant, sont produits à partir du signal corporel déduit, de sorte que chacun des signaux de rétroaction acoustiques représente une plage partielle de l'ensemble de la plage électromyographique utile.
EP98928132A 1997-04-04 1998-04-03 Appareil de retroaction electromyographique pour entrainement a la relaxation Withdrawn EP0914058A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19713947 1997-04-04
DE19713947A DE19713947C2 (de) 1997-04-04 1997-04-04 Elektromyographie-Biofeedbackgerät für Entspannungstraining
PCT/DE1998/000956 WO1998044840A1 (fr) 1997-04-04 1998-04-03 Appareil de retroaction electromyographique pour entrainement a la relaxation

Publications (1)

Publication Number Publication Date
EP0914058A1 true EP0914058A1 (fr) 1999-05-12

Family

ID=7825451

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98928132A Withdrawn EP0914058A1 (fr) 1997-04-04 1998-04-03 Appareil de retroaction electromyographique pour entrainement a la relaxation

Country Status (4)

Country Link
EP (1) EP0914058A1 (fr)
AU (1) AU8009398A (fr)
DE (1) DE19713947C2 (fr)
WO (1) WO1998044840A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10002251A1 (de) * 2000-01-20 2001-08-16 W & W Frenkel Gmbh & Co Kg Interaktives Wellnessgerät
DE10100663A1 (de) * 2001-01-02 2002-07-04 Stielau Guenter EEG Stimulation durch modulierten binaurale Laufzeitdifferenz sowie Biofeedback
DE10253075B4 (de) * 2002-11-13 2006-10-05 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Vorrichtung zur Diagnose und/oder Therapie von Funktionsstörungen der Halswirbelsäule
DE102006016716A1 (de) * 2006-04-08 2007-10-11 Universität Tübingen Feedbacktraining im Fahrzeug
DE102006027372B4 (de) * 2006-06-13 2009-04-09 Alexander Sokolnitzky Elektromyographie-Biofeedbackgerät für Entspannungstraining
DE202015001313U1 (de) 2015-02-18 2015-04-17 Ronge Tall Vorrichtung und System zum Empfang vom EMG-Signalen und/oder übermitteln von EMS-Signalen an einen menschlichen Körper um ihn zu trainieren

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1360164A (fr) * 1962-08-07 1964-05-08 Dispositif d'enregistrement ou de conversion d'oscillations électriques, ou de vibrations acoustiques de diverses fréquences, préalablement transformées en oscillations électriques
US4110918A (en) * 1976-07-21 1978-09-05 Cyborg Corporation Modular biofeedback training system
US5123899A (en) * 1991-01-17 1992-06-23 James Gall Method and system for altering consciousness
DE4139241C2 (de) * 1991-11-22 1996-05-02 Steindorf Susanne Ruth Vorrichtung zum Biofeedback-Training
DE9405523U1 (de) * 1994-03-31 1994-06-09 Sokolnitzky, Alexander, 81927 München Elektromyographie-Biofeedbackgerät
US5577510A (en) * 1995-08-18 1996-11-26 Chittum; William R. Portable and programmable biofeedback system with switching circuit for voice-message recording and playback

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9844840A1 *

Also Published As

Publication number Publication date
WO1998044840A1 (fr) 1998-10-15
AU8009398A (en) 1998-10-30
DE19713947A1 (de) 1998-10-15
DE19713947C2 (de) 2000-04-06

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