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Mindfield® eSense Muscle | Assess muscle tone

Assess muscle tone with the eSense Muscle

The musculature of the human being plays an essential role in the body. Our muscles are the largest energy consumer and are responsible for about 70- 80% of our body weight. Muscle activity is manifested along the fibers of a striated muscle in the form of permanent, electrical potential shifts. This electrical activity can be measured at the skin surface in the form of more considerable summation potentials. This form of measurement is called (surface) electromyography, and the result is an electromyogram. The eSense Muscle can measure and train electromyographic muscle activity and transmit it to your computer/smartphone/tablet via Bluetooth®. Transverse striated muscles are controlled by our somatic nervous system and are subject to voluntary control. Every volitional action of a muscle can therefore be observed in an electromyogram. Thus, the tension of a muscle on 27 which surface EMG electrodes are placed immediately leads to increased trace in the EMG signal. However, involuntary reactions, such as stress, inner tension, and emotional experience, can also be measured as (tonic) activity in the EMG. EMG biofeedback can also report back the general psychophysiological tension. Assess muscle tone with the eSense Muscle is therefore very precise and simple at the same time. The interplay between the autonomic and somatic nervous systems can be depicted particularly well in the EMG. Increased muscle tone is mainly based on an increase in sympathetic activity. A decrease can be attributed to more robust parasympathetic activation. This biofeedback for stress and relaxation is very important so that you can train your body and thus actively reduce stress levels.

Assess muscle tension – get biofeedback on stress

With the eSense Muscle you can find out how stressed your body is. Using electromyography (EMG), you can assess your muscle tone and thus get an accurate picture of your state of tension. You receive direct biofeedback during relaxation and stress. The eSense Muscle is therefore the optimal device for a user-friendly measurement of body tension. You do not need any medical knowledge or skills to get biofeedback during stress. But you can also read and recognise biofeedback during relaxation without any problems via your mobile device. The instant biofeedback of the eSense Muscle allows you to control and reduce your body tension. In real time, the muscle tone is assessed and you can follow the biofeedback via the screen of your smartphone. You can recognise stress by a higher body tension, a low muscle activity indicates that you are relaxed. Biofeedback on relaxation is very valuable for your everyday life and stress management. Assessing muscle tone has never been so easy and effective. There are also other devices, such as the eSense Skin Response, which allows you to measure your skin resistance and detect your stress level.

Muscle relaxation – muscle biofeedback

The eSense Muscle can also help you loosen your muscles. Simply connect the device to a tense part of your body to read the muscle tone. The biofeedback gives you information about your muscle activity, so you can specifically improve your relaxation techniques and see if certain exercises have led to a loosening of the muscles. This can be very helpful for rehabilitation, especially after sports injuries or accidents. You can also use your body tension during a muscle loosening exercise and thus check whether a muscle has come to rest or not. In this way, you can specifically reduce tension and optimise your rehabilitation process. The eSense Muscle is the perfect tool to assess body tone, prevent pain and detect stress in the muscles!

Manuals for the eSense Muscle

Link to our helpdesk >>>
Link to our helpdesk >>>

Mindfield eSense Web App for Windows, Mac and Linux
The eSense Muscle is being delivered with new software for the first time, a web app that runs exclusively in a browser. You don’t need to install any software. All you need is:
  • A PC / notebook with: Windows 10, Mac or Linux
  • A functioning Bluetooth® connection on this PC / notebook, Bluetooth® must therefore be available and usable.
  • A browser that supports “Web Bluetooth®” so that you can connect to our eSense Muscle via Bluetooth®. As of April 2021, these are Google Chrome, Microsoft Edge and Opera
NOT SUPPORTED are explicitly Mozilla Firefox and Apple’s Safari! So if you have a computer with Bluetooth® and one of the browsers mentioned, please go to the website:

Images of the eSense web app

Videos of the eSense Web App

YouTube video

Mindfield eSense Mobile App (iOS and Android)

(Pro Edition)

Icon eSenseYou can also use the eSense Muscle with our Mindfield eSense Mobile App. You can download it for free from the Apple App Store (iOS) or in the Google Play Store (Android). It offers a wealth of features for effective biofeedback training in a modern design.

Apple App Store Google Play Store

More information about installing the eSense Mobile App for the eSense Muscle can also be found here:

YouTube video

YouTube video

Use the eSense Muscle for:

  • Training of your muscles
  • Strengthening of your muscles
  • Relaxation of typical stress muscles (forehead, jaw, shoulder, neck)
  • Reduction of muscle tension
  • Coordination exercises
  • Muscle building

Quick User Guide

  • The complete manual can be found on our website under “Biofeedback” => “Products” => “eSense” => “eSense Muscle”. You can also find a demo video on our website. A short instruction comes with the eSense Muscle as well.
  • Take the electrode cable set from the package. Five electrode cables are included. In black, white, yellow, red and green.
  • The yellow electrode cable is the ground / earthing electrode!
  • For a 1-channel measurement, please use the electrodes black (channel 1+), white (channel 1-) and yellow (grounding).
  • For a 2-channel measurement, please use the electrodes black (channel 1+), white (channel 1-), yellow (grounding), red (channel 2+) and green (channel 2-).

Note Pro and Home version

There are two versions of the eSense Muscle:
  • professional version (Pro Edition) at full price with which EMG measurements can be performed with 2 channels. The web app, the mobile app for iOS and Android, all games and the oscilloscope are available
  • private version (Home Edition) at a reduced price with which EMG measurements can be performed with 1 channel. Available is the web app with the games and 1-channel animations, but without oscilloscope, recording function and 2-channel animations. The mobile eSense app for iOS and Android is also only part of the Pro Edition

Details Home Edition

  • One channel is available (the scope of delivery of the Home Edition therefore also includes only the accessories for 1-channel training)
  • A bandpass of 100-200 Hz is preset
  • All 1-channel animations are available
  • All games are also available in the Home Edition (as generally all games are also playable with one channel)
  • On the highscore page all points from the games and animations are visible for the user
  • The web app is available

Details Pro Edition

  • One and two channels are available
  • The bandpasses are freely selectable (20-950 Hz, 20-300 Hz and 100-200 Hz)
  • All 1-channel and also 2-channel animations are available
  • All games are also available in Pro Edition.
  • On the highscore page all points from the games and animations are also visible on a global list of all Pro Edition users (optional)
  • An oscilloscope with functions like a long time history and drawing mode is available
  • A contraction helper is available
  • The storage and display of the raw data of all measurements is possible
  • The web app and the mobile app are available
Note: The Pro Edition is unlocked by entering a password in the options.

Two examples for a 1-channel measurement

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An example of a 2-channel measurement

esense Muscle

Who is the eSense suitable for?

  • for private users / home users
  • for professional users (biofeedback trainer)
While the professional version is aimed at professional biofeedback trainers, the private version enables the personal use at an affordable price.

Scope of delivery of the eSense Muscle:

  • Mindfield® eSense Muscle Sensor incl. 1600mAh lithium polymer battery for approx. 12 hours of continuous operation
  • Electrode cable set for connecting up to 3 electrodes (Home Edition) or 5 electrodes (Pro Edition)
  • USB-C charging cable and charger
  • Bluetooth® dongle for Windows, if your PC does not have Bluetooth® (please refer to the enclosed instructions)
  • 50 pieces of EMG surface electrodes
  • 50 pieces of alcohol swabs for cleaning the skin
  • eSense Muscle Web App from Mindfield, available at
  • eSense Muscle Mobile App by Mindfield for iOS & Android (Pro Edition, can be unlocked via password in the eSense App)
  • Detailed instructions for effective biofeedback training.
esense Muscle Stressmanagement Gerät

Virtual Reality (VR) (f.i. Meta Quest 3)

All our eSense sensors and our eSense app also work with VR (virtual reality) glasses. In particular, the graph of the measurement as well as the photos and videos of the biofeedback training can be viewed in impressive detail with the VR glasses.
YouTube video

Technical details

  • 2-channel EMG biofeedback device
  • Bluetooth® 5.0 transmission to PC or smartphone / tablet (Android and iOS)
  • Built-in Li-Ion battery 1600mAh for up to 12 hours of uninterrupted operation
  • 2 bipolar EMG inputs (CH1 +, CH1-, CH2 +, CH2-), 1 x analog ground
  • 2 multifunction buttons for operating the device
  • 1 RGB LED to display the operating status
  • 24 bit ADC and preamplifier for each channel, native sampling with 2 kHz per channel
  • 3 Bandpass filter (Bessel, 8th order) per channel. -3dB. Limit frequencies: BP1: 20..950Hz, BP2: 20..300Hz, BP3: 100..200Hz
  • RMS calculation and moving average over 0.5 seconds. Decimation to 100 RMS samples per second
  • 200mV differential measuring range per channel
  • 0.024 μV ADC Resolution per LSB
  • < 1.7 μV RMS Noise BP1
  • < 1.3 μV RMS Noise BP2
  • < 0.8 μV RMS Noise BP3
  • Channel 1 and 2 CMRR at 50Hz and 60Hz: better -105dB
  • Protection against electrostatic discharges (ESD) up to + -15kV according to the “Human Body Model”, IEC 1000-4-2, Air-Gap Discharge
  • HF-Filter
  • Operating mode: continuous operation
  • Measurement accuracy EMG amplifier / ADC, amplification: ± 5% basic accuracy, ± 0.2% after calibration, bandpass lower and upper limit frequency: ± 0.1%, sampling frequency: better than ± 0.1% (Resonator)
  • Operating range: 5-40 ° C, <= 95% relative humidity
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