Abstract
The general purpose of normalization of EMG amplitude is to enable comparisons between participants, muscles, measurement sessions or electrode positions. Normalization is necessary to reduce the impact of differences in physiological and anatomical characteristics of muscles and surrounding tissues. Normalization of the EMG amplitude provides information about the magnitude of muscle activation relative to a reference value. It is essential to select an appropriate method for normalization with specific reference to how the EMG signal will be interpreted, and to consider how the normalized EMG amplitude may change when interpreting it under specific conditions. This matrix, developed by the Consensus for Experimental Design in Electromyography (CEDE) project, presents six approaches to EMG normalization: (1) Maximal voluntary contraction (MVC) in same task/context as the task of interest, (2) Standardized isometric MVC (which is not necessarily matched to the contraction type in the task of interest), (3) Standardized submaximal task (isometric/dynamic) that can be task-specific, (4) Peak/mean EMG amplitude in task, (5) Non-normalized, and (6) Maximal M-wave. General considerations for normalization, features that should be reported, definitions, and “pros and cons” of each normalization approach are presented first. This information is followed by recommendations for specific experimental contexts, along with an explanation of the factors that determine the suitability of a method, and frequently asked questions. This matrix is intended to help researchers when selecting, reporting and interpreting EMG amplitude data.
Original language | English |
---|---|
Article number | 102438 |
Pages (from-to) | 1-17 |
Number of pages | 17 |
Journal | Journal of Electromyography and Kinesiology |
Volume | 53 |
Early online date | 10 Jun 2020 |
DOIs | |
Publication status | Published - Aug 2020 |
Funding
Funding: This research was funded by the National Health and Medical Research Council (NHMRC) of Australia (Program Grant: APP1091302). PWH is supported by an NHMRC Senior Principal Research Fellowship (APP1102905). MB is supported by the University of Queensland Research Training Scholarship. MCK was supported by the NHMRC Program Grant (APP1132524), Partnership Project (APP1153439) and Practitioner Fellowship (APP1156093). AH is supported by Slovenian Research Agency (projects J2-1731 and L7-9421 and Program funding P2-0041). FH is supported by a fellowship from the Institut Universitaire de France (IUF). DF is supported by the European Research Council (ERC; 810346) and by the Royal Society (Wolfson Research Merit Award).
Funders | Funder number |
---|---|
Horizon 2020 Framework Programme | 646923 |
Royal Society | |
European Research Council | 810346 |
National Health and Medical Research Council | APP1091302, APP1102905 |
University of Queensland | APP1156093, APP1153439, APP1132524 |
Javna Agencija za Raziskovalno Dejavnost RS | L7-9421, J2-1731, P2-0041 |
Institut universitaire de France |
Keywords
- Amplitude normalization
- Consensus
- Electromyography
- Muscle activation