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LabScribe EMG Analysis Module

The EMG analysis module is an add-on to LabScribe software that allows for various time domain and frequency domain measurements of EMG data, including Maximum Voluntary Contraction (MVC) and Root Mean Square (RMS). See below for a complete list of analysis options.

SKU: LS-EMG Category: Software Tags: Analysis, EMG, Software

Measurements

EMG Analysis Module can be used for measurements including SEMG Measurements, Maximal Voluntary Contraction (MVC), Muscle Force, Fatigue, Recruitment, Summation, Incomplete Tetanus, Complete Tetanus, and H-Reflex.

Time Domain Analysis

Setup instructions for EMG Analysis are available here.

Root Mean Square (RMS)
Maximum Voluntary Contraction (MVC)
Average Rectified Value
Threshold
Teager-Kaiser Energy

Frequency Domain Analysis

Setup instructions for EMG Analysis are available here.

Power Spectral Density (FFT)
Mean (MNF) and Median (MDF) Frequency
Peak Frequency (PKF)
Total Power (TTP)
Mean Power (MNP)
Frequency Ratio (FR)

LabScribe - EMG MCV — Maximum Voluntary Contraction (MVC)

labscribe - EMG ARV — Average Rectified Value (ARV)

labscribe - EMG RMS — Root Mean Square (RMS)

labscribe - EMG Freq Ratio — Frequency Ratio

labscribe - EMG Mean Median Peak Freq — Mean, Median, and Peak Frequency

labscribe - EMG Threshold — Threshold

labscribe - EMG TKE — Teager-Kaiser Energy (TKE)

labscribe - EMG Total Mean Power — Total and Mean Power

Manual

Setup instructions for EMG Analysis are available here.

Tutorial Videos

EMG

8 Videos

Maximum Voluntary Contraction (MVC) in LabScribe

1:14

Average Rectified Value (ARV) in LabScribe

1:04

Average Rectified Value (ARV) in LabScribe

1:04

EMG Frequency Ratio in LabScribe

0:55

EMG Threshold Analysis in LabScribe

1:01

Mean, Median, and Peak Frequency in LabScribe

1:12

Teager Kaiser Energy (TKE) in LabScribe

0:59

Total Power and Mean Power in LabScribe

1:14

Systems

Definitions

Time Domain Analysis Definitions

Root Mean Square (RMS) – The most common method for quantifying EMG amplitude. RMS reflects the power of the EMG signal by squaring, averaging, and taking the square root of the signal. It produces a smooth, easy-to-interpret envelope commonly used for assessing muscle activation intensity.
Maximum Voluntary Contraction (MVC) – A widely used measure of maximum muscle force output during a voluntary effort. In EMG analysis, MVC is the reference condition used for normalization.
Average Rectified Value (ARV) – The average of the rectified EMG signal (all negative values flipped to positive). It reflects overall muscle activation and neural drive. ARV correlates strongly with RMS, but RMS tends to be higher due to squaring, and is more sensitive to larger amplitude spikes.
Threshold – Threshold analysis is performed on the RMS channel to segment EMG into periods of activity vs. inactivity. A user-defined amplitude threshold determines when muscle activation begins and ends.
Teager-Kaiser Energy – Measures the amount of energy in an EMG signal at a single point (no averaging). It can emphasise rapid changes in amplitude or frequency.

Frequency Domain Analysis Definitions

Power Spectral Density (FFT) – Breaks down the signal into high and low-frequency spectral components.
Mean (MNF) and Median (MDF) Frequency – The two most widely used frequency-domain metrics for assessing muscle fatigue. As muscles fatigue, the power spectrum typically shifts toward lower frequencies.
Peak Frequency (PKF) – The frequency at which the EMG power spectrum reaches its maximum value.
Mean Power (MNP) – It is the average spectral power across the frequency bandwidth.
Total Power (TTP) – The total power contained within the EMG spectrum, often obtained by integrating the PSD over the frequency band.
Frequency Ratio (FR) – The ratio of low-frequency power to high-frequency power. A shift toward lower frequencies can indicate fatigue or relaxation, while a shift toward higher frequencies can indicate increased activation or recruitment of fast-twitch motor units.

LabScribe EMG Analysis Module

The iWorx LabScribe EMG Software Module is a robust and intuitive tool designed to effortlessly streamline the analysis of EMG data across a wide range of species.

Measurements

SEMG Measurements
Maximal Voluntary Contraction (MVC)
Muscle Force
Fatigue
Recruitment
Summation
Incomplete Tetanus
Complete Tetanus
H-Reflex

Analysis

Time Domain Analysis

Root Mean Square (RMS)
- Regarded as the most common method for assessing the amplitude of the EMG signal, as it offers a measure of the signal’s power and generates a waveform that is easy to analyze
Maximum Voluntary Contraction (MVC)
- A widely used measure of muscle strength in research. It represents the greatest force a person can voluntarily produce, reflecting their maximum effort
(Average) Rectified EMG Data
- For determining the overall strength of the neural drive to the muscle and is correlated with both the strength of muscle contraction and its output
Threshold
- For the detection of muscle activity timing in EMG signals
Teager-Kaiser
- Measures the amount of energy in an EMG signal
Area Under The Curve
- For determining the compound motor action potential (CMAP) and other measurements
Envelope EMG Data
- A classic method of measuring muscle contraction
Filtering
- User controlled high pass and low pass filters

Frequency Domain Analysis

Power Spectral Density (FFT)
- Breaks down the signal into high and low-frequency spectral components
Mean (MNF) and Median (MDF) Frequency
- The most valuable and commonly used frequency-domain features for assessing muscle fatigue in surface EMG signals
Peak Frequency (PKF)
- Frequency at which the maximum EMG power occurs
Total Power (TTP)
- Total amount of power used over time
Mean Power (MNP)
- The average power of EMG power spectrum
Frequency Ratio (FR)
- Differentiate between contraction and relaxation of muscle and it is defined as the ratio of power spectrum at low-frequency band and high-frequency band

EMG

8 Videos

Maximum Voluntary Contraction (MVC) in LabScribe

1:14

Average Rectified Value (ARV) in LabScribe

1:04

Average Rectified Value (ARV) in LabScribe

1:04

EMG Frequency Ratio in LabScribe

0:55

EMG Threshold Analysis in LabScribe

1:01

Mean, Median, and Peak Frequency in LabScribe

1:12

Teager Kaiser Energy (TKE) in LabScribe

0:59

Total Power and Mean Power in LabScribe

1:14

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Have Questions?

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