Quality Control of Motor Unit Number Index (MUNIX) Measurements in 6 Muscles in a Single-Subject “Round-Robin” Setup
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{"title"=>"Quality control of Motor Unit Number Index (MUNIX) measurements in 6 muscles in a single-subject \"round-robin\" setup", "type"=>"journal", "authors"=>[{"first_name"=>"Christoph", "last_name"=>"Neuwirth", "scopus_author_id"=>"35747086500"}, {"first_name"=>"Christian", "last_name"=>"Burkhardt", "scopus_author_id"=>"56506787300"}, {"first_name"=>"James", "last_name"=>"Alix", "scopus_author_id"=>"14824737200"}, {"first_name"=>"José", "last_name"=>"Castro", "scopus_author_id"=>"23990093200"}, {"first_name"=>"Mamede", "last_name"=>"De Carvalho", "scopus_author_id"=>"57200703729"}, {"first_name"=>"Malgorzata", "last_name"=>"Gawel", "scopus_author_id"=>"35175742500"}, {"first_name"=>"Stephan", "last_name"=>"Goedee", "scopus_author_id"=>"55640174600"}, {"first_name"=>"Julian", "last_name"=>"Grosskreutz", "scopus_author_id"=>"55880962700"}, {"first_name"=>"Timothée", "last_name"=>"Lenglet", "scopus_author_id"=>"35590083400"}, {"first_name"=>"Cristina", "last_name"=>"Moglia", "scopus_author_id"=>"16203396300"}, {"first_name"=>"Taha", "last_name"=>"Omer", "scopus_author_id"=>"57194424550"}, {"first_name"=>"Maarten", "last_name"=>"Schrooten", "scopus_author_id"=>"16040629400"}, {"first_name"=>"Markus", "last_name"=>"Weber", "scopus_author_id"=>"55737067000"}], "year"=>2016, "source"=>"PLoS ONE", "identifiers"=>{"doi"=>"10.1371/journal.pone.0153948", "sgr"=>"84967321300", "pui"=>"610342579", "scopus"=>"2-s2.0-84967321300", "issn"=>"19326203", "pmid"=>"27135747"}, "id"=>"1e1d385d-52e8-3696-b900-fbb546c3db3c", "abstract"=>"BACKGROUND Motor Unit Number Index (MUNIX) is a neurophysiological measure that provides an index of the number of lower motor neurons in a muscle. Its performance across centres in healthy subjects and patients with Amyotrophic Lateral Sclerosis (ALS) has been established, but inter-rater variability between multiple raters in one single subject has not been investigated. OBJECTIVE To assess reliability in a set of 6 muscles in a single subject among 12 examiners (6 experienced with MUNIX, 6 less experienced) and to determine variables associated with variability of measurements. METHODS Twelve raters applied MUNIX in six different muscles (abductor pollicis brevis (APB), abductor digiti minimi (ADM), biceps brachii (BB), tibialis anterior (TA), extensor dig. brevis (EDB), abductor hallucis (AH)) twice in one single volunteer on consecutive days. All raters visited at least one training course prior to measurements. Intra- and inter-rater variability as determined by the coefficient of variation (COV) between different raters and their levels of experience with MUNIX were compared. RESULTS Mean intra-rater COV of MUNIX was 14.0% (±6.4) ranging from 5.8 (APB) to 30.3% (EDB). Mean inter-rater COV was 18.1 (±5.4) ranging from 8.0 (BB) to 31.7 (AH). No significant differences of variability between experienced and less experienced raters were detected. CONCLUSION We provide evidence that quality control for neurophysiological methods can be performed with similar standards as in laboratory medicine. Intra- and inter-rater variability of MUNIX is muscle-dependent and mainly below 20%. Experienced neurophysiologists can easily adopt MUNIX and adequate teaching ensures reliable utilization of this method.", "link"=>"http://www.mendeley.com/research/quality-control-motor-unit-number-index-munix-measurements-6-muscles-singlesubject-roundrobin-setup", "reader_count"=>17, "reader_count_by_academic_status"=>{"Unspecified"=>2, "Professor > Associate Professor"=>2, "Librarian"=>1, "Researcher"=>5, "Student > Master"=>1, "Other"=>3, "Student > Bachelor"=>2, "Professor"=>1}, "reader_count_by_user_role"=>{"Unspecified"=>2, "Professor > Associate Professor"=>2, "Librarian"=>1, "Researcher"=>5, "Student > Master"=>1, "Other"=>3, "Student > Bachelor"=>2, "Professor"=>1}, "reader_count_by_subject_area"=>{"Unspecified"=>4, "Medicine and Dentistry"=>8, "Agricultural and Biological Sciences"=>1, "Neuroscience"=>2, "Social Sciences"=>2}, "reader_count_by_subdiscipline"=>{"Medicine and Dentistry"=>{"Medicine and Dentistry"=>8}, "Neuroscience"=>{"Neuroscience"=>2}, "Social Sciences"=>{"Social Sciences"=>2}, "Agricultural and Biological Sciences"=>{"Agricultural and Biological Sciences"=>1}, "Unspecified"=>{"Unspecified"=>4}}, "group_count"=>1}

Scopus | Further Information

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Figshare

  • {"files"=>["https://ndownloader.figshare.com/files/5042257"], "description"=>"<div><p>Background</p><p>Motor Unit Number Index (MUNIX) is a neurophysiological measure that provides an index of the number of lower motor neurons in a muscle. Its performance across centres in healthy subjects and patients with Amyotrophic Lateral Sclerosis (ALS) has been established, but inter-rater variability between multiple raters in one single subject has not been investigated.</p><p>Objective</p><p>To assess reliability in a set of 6 muscles in a single subject among 12 examiners (6 experienced with MUNIX, 6 less experienced) and to determine variables associated with variability of measurements.</p><p>Methods</p><p>Twelve raters applied MUNIX in six different muscles (abductor pollicis brevis (APB), abductor digiti minimi (ADM), biceps brachii (BB), tibialis anterior (TA), extensor dig. brevis (EDB), abductor hallucis (AH)) twice in one single volunteer on consecutive days. All raters visited at least one training course prior to measurements. Intra- and inter-rater variability as determined by the coefficient of variation (COV) between different raters and their levels of experience with MUNIX were compared.</p><p>Results</p><p>Mean intra-rater COV of MUNIX was 14.0% (±6.4) ranging from 5.8 (APB) to 30.3% (EDB). Mean inter-rater COV was 18.1 (±5.4) ranging from 8.0 (BB) to 31.7 (AH). No significant differences of variability between experienced and less experienced raters were detected.</p><p>Conclusion</p><p>We provide evidence that quality control for neurophysiological methods can be performed with similar standards as in laboratory medicine. Intra- and inter-rater variability of MUNIX is muscle-dependent and mainly below 20%. Experienced neurophysiologists can easily adopt MUNIX and adequate teaching ensures reliable utilization of this method.</p></div>", "links"=>[], "tags"=>["BB", "quality control", "ADM", "Amyotrophic Lateral Sclerosis", "COV", "training course", "Motor Unit Number Index", "APB", "6 muscles", "subject", "variability", "neurophysiological measure", "ALS", "Quality Control", "MUNIX", "laboratory medicine", "rater", "neurophysiological methods", "EDB", "motor neurons", "abductor pollicis brevis", "6 Muscles", "TA", "AH"], "article_id"=>3211906, "categories"=>["Biophysics", "Cell Biology", "Molecular Biology", "Neuroscience", "Biotechnology", "Evolutionary Biology", "Developmental Biology", "Infectious Diseases", "Virology"], "users"=>["Christoph Neuwirth", "Christian Burkhardt", "James Alix", "José Castro", "Mamede de Carvalho", "Malgorzata Gawel", "Stephan Goedee", "Julian Grosskreutz", "Timothée Lenglet", "Cristina Moglia", "Taha Omer", "Maarten Schrooten", "Markus Weber"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0153948", "stats"=>{"downloads"=>0, "page_views"=>0, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/Quality_Control_of_Motor_Unit_Number_Index_MUNIX_Measurements_in_6_Muscles_in_a_Single-Subject_Round-Robin_Setup/3211906", "title"=>"Quality Control of Motor Unit Number Index (MUNIX) Measurements in 6 Muscles in a Single-Subject “Round-Robin” Setup", "pos_in_sequence"=>1, "defined_type"=>6, "published_date"=>"2016-05-02 08:19:53"}
  • {"files"=>["https://ndownloader.figshare.com/files/5042302"], "description"=>"<p>Relative mean and standard deviation of MUNIX and CMAP measurements in individual muscles of the experienced group (filled circles) and less-experienced group (empty circles) compared to the hypothetical reference values, expressed as accuracy (%).</p>", "links"=>[], "tags"=>["BB", "quality control", "ADM", "Amyotrophic Lateral Sclerosis", "COV", "training course", "Motor Unit Number Index", "APB", "6 muscles", "subject", "variability", "neurophysiological measure", "ALS", "Quality Control", "MUNIX", "laboratory medicine", "rater", "neurophysiological methods", "EDB", "motor neurons", "abductor pollicis brevis", "6 Muscles", "TA", "AH"], "article_id"=>3211939, "categories"=>["Biophysics", "Cell Biology", "Molecular Biology", "Neuroscience", "Biotechnology", "Evolutionary Biology", "Developmental Biology", "Infectious Diseases", "Virology"], "users"=>["Christoph Neuwirth", "Christian Burkhardt", "James Alix", "José Castro", "Mamede de Carvalho", "Malgorzata Gawel", "Stephan Goedee", "Julian Grosskreutz", "Timothée Lenglet", "Cristina Moglia", "Taha Omer", "Maarten Schrooten", "Markus Weber"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0153948.g002", "stats"=>{"downloads"=>0, "page_views"=>0, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/Relative_mean_and_standard_deviation_of_MUNIX_and_CMAP_measurements_in_individual_muscles_of_the_experienced_group_filled_circles_and_less-experienced_group_empty_circles_compared_to_the_hypothetical_reference_values_expressed_as_accuracy_/3211939", "title"=>"Relative mean and standard deviation of MUNIX and CMAP measurements in individual muscles of the experienced group (filled circles) and less-experienced group (empty circles) compared to the hypothetical reference values, expressed as accuracy (%).", "pos_in_sequence"=>3, "defined_type"=>1, "published_date"=>"2016-05-02 08:19:53"}
  • {"files"=>["https://ndownloader.figshare.com/files/5042362"], "description"=>"<p># = number.</p>", "links"=>[], "tags"=>["BB", "quality control", "ADM", "Amyotrophic Lateral Sclerosis", "COV", "training course", "Motor Unit Number Index", "APB", "6 muscles", "subject", "variability", "neurophysiological measure", "ALS", "Quality Control", "MUNIX", "laboratory medicine", "rater", "neurophysiological methods", "EDB", "motor neurons", "abductor pollicis brevis", "6 Muscles", "TA", "AH"], "article_id"=>3211981, "categories"=>["Biophysics", "Cell Biology", "Molecular Biology", "Neuroscience", "Biotechnology", "Evolutionary Biology", "Developmental Biology", "Infectious Diseases", "Virology"], "users"=>["Christoph Neuwirth", "Christian Burkhardt", "James Alix", "José Castro", "Mamede de Carvalho", "Malgorzata Gawel", "Stephan Goedee", "Julian Grosskreutz", "Timothée Lenglet", "Cristina Moglia", "Taha Omer", "Maarten Schrooten", "Markus Weber"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0153948.t001", "stats"=>{"downloads"=>0, "page_views"=>0, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/Characteristics_of_raters_familiar_1_to_6_and_less_familiar_7_to12_with_the_MUNIX_method_/3211981", "title"=>"Characteristics of raters familiar (1 to 6) and less familiar (7 to12) with the MUNIX method.", "pos_in_sequence"=>5, "defined_type"=>3, "published_date"=>"2016-05-02 08:19:53"}
  • {"files"=>["https://ndownloader.figshare.com/files/5042407"], "description"=>"<p>Inter-rater variability (COV) in individual muscles for the first and second measurement and mean of both values.</p>", "links"=>[], "tags"=>["BB", "quality control", "ADM", "Amyotrophic Lateral Sclerosis", "COV", "training course", "Motor Unit Number Index", "APB", "6 muscles", "subject", "variability", "neurophysiological measure", "ALS", "Quality Control", "MUNIX", "laboratory medicine", "rater", "neurophysiological methods", "EDB", "motor neurons", "abductor pollicis brevis", "6 Muscles", "TA", "AH"], "article_id"=>3212017, "categories"=>["Biophysics", "Cell Biology", "Molecular Biology", "Neuroscience", "Biotechnology", "Evolutionary Biology", "Developmental Biology", "Infectious Diseases", "Virology"], "users"=>["Christoph Neuwirth", "Christian Burkhardt", "James Alix", "José Castro", "Mamede de Carvalho", "Malgorzata Gawel", "Stephan Goedee", "Julian Grosskreutz", "Timothée Lenglet", "Cristina Moglia", "Taha Omer", "Maarten Schrooten", "Markus Weber"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0153948.t003", "stats"=>{"downloads"=>0, "page_views"=>0, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/Inter-rater_variability_COV_in_individual_muscles_for_the_first_and_second_measurement_and_mean_of_both_values_/3212017", "title"=>"Inter-rater variability (COV) in individual muscles for the first and second measurement and mean of both values.", "pos_in_sequence"=>7, "defined_type"=>3, "published_date"=>"2016-05-02 08:19:53"}
  • {"files"=>["https://ndownloader.figshare.com/files/5042440"], "description"=>"<p>Descriptive results of MUNIX and CMAP measurements in different rater groups.</p>", "links"=>[], "tags"=>["BB", "quality control", "ADM", "Amyotrophic Lateral Sclerosis", "COV", "training course", "Motor Unit Number Index", "APB", "6 muscles", "subject", "variability", "neurophysiological measure", "ALS", "Quality Control", "MUNIX", "laboratory medicine", "rater", "neurophysiological methods", "EDB", "motor neurons", "abductor pollicis brevis", "6 Muscles", "TA", "AH"], "article_id"=>3212053, "categories"=>["Biophysics", "Cell Biology", "Molecular Biology", "Neuroscience", "Biotechnology", "Evolutionary Biology", "Developmental Biology", "Infectious Diseases", "Virology"], "users"=>["Christoph Neuwirth", "Christian Burkhardt", "James Alix", "José Castro", "Mamede de Carvalho", "Malgorzata Gawel", "Stephan Goedee", "Julian Grosskreutz", "Timothée Lenglet", "Cristina Moglia", "Taha Omer", "Maarten Schrooten", "Markus Weber"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0153948.t004", "stats"=>{"downloads"=>0, "page_views"=>0, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/Descriptive_results_of_MUNIX_and_CMAP_measurements_in_different_rater_groups_/3212053", "title"=>"Descriptive results of MUNIX and CMAP measurements in different rater groups.", "pos_in_sequence"=>8, "defined_type"=>3, "published_date"=>"2016-05-02 08:19:53"}
  • {"files"=>["https://ndownloader.figshare.com/files/5042326"], "description"=>"<p>Correlation between duration of measurements and maximum stimulus intensity for all 6 muscles.</p>", "links"=>[], "tags"=>["BB", "quality control", "ADM", "Amyotrophic Lateral Sclerosis", "COV", "training course", "Motor Unit Number Index", "APB", "6 muscles", "subject", "variability", "neurophysiological measure", "ALS", "Quality Control", "MUNIX", "laboratory medicine", "rater", "neurophysiological methods", "EDB", "motor neurons", "abductor pollicis brevis", "6 Muscles", "TA", "AH"], "article_id"=>3211957, "categories"=>["Biophysics", "Cell Biology", "Molecular Biology", "Neuroscience", "Biotechnology", "Evolutionary Biology", "Developmental Biology", "Infectious Diseases", "Virology"], "users"=>["Christoph Neuwirth", "Christian Burkhardt", "James Alix", "José Castro", "Mamede de Carvalho", "Malgorzata Gawel", "Stephan Goedee", "Julian Grosskreutz", "Timothée Lenglet", "Cristina Moglia", "Taha Omer", "Maarten Schrooten", "Markus Weber"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0153948.g003", "stats"=>{"downloads"=>0, "page_views"=>0, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/Correlation_between_duration_of_measurements_and_maximum_stimulus_intensity_for_all_6_muscles_/3211957", "title"=>"Correlation between duration of measurements and maximum stimulus intensity for all 6 muscles.", "pos_in_sequence"=>4, "defined_type"=>1, "published_date"=>"2016-05-02 08:19:53"}
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  • {"files"=>["https://ndownloader.figshare.com/files/5042392"], "description"=>"<p>Coefficient of variation (COV) and variability () for MUNIX measurements in individual muscles in raters.</p>", "links"=>[], "tags"=>["BB", "quality control", "ADM", "Amyotrophic Lateral Sclerosis", "COV", "training course", "Motor Unit Number Index", "APB", "6 muscles", "subject", "variability", "neurophysiological measure", "ALS", "Quality Control", "MUNIX", "laboratory medicine", "rater", "neurophysiological methods", "EDB", "motor neurons", "abductor pollicis brevis", "6 Muscles", "TA", "AH"], "article_id"=>3211999, "categories"=>["Biophysics", "Cell Biology", "Molecular Biology", "Neuroscience", "Biotechnology", "Evolutionary Biology", "Developmental Biology", "Infectious Diseases", "Virology"], "users"=>["Christoph Neuwirth", "Christian Burkhardt", "James Alix", "José Castro", "Mamede de Carvalho", "Malgorzata Gawel", "Stephan Goedee", "Julian Grosskreutz", "Timothée Lenglet", "Cristina Moglia", "Taha Omer", "Maarten Schrooten", "Markus Weber"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0153948.t002", "stats"=>{"downloads"=>0, "page_views"=>0, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/Coefficient_of_variation_COV_and_variability_for_MUNIX_measurements_in_individual_muscles_in_raters_/3211999", "title"=>"Coefficient of variation (COV) and variability () for MUNIX measurements in individual muscles in raters.", "pos_in_sequence"=>6, "defined_type"=>3, "published_date"=>"2016-05-02 08:19:53"}

PMC Usage Stats | Further Information

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Relative Metric

{"start_date"=>"2016-01-01T00:00:00Z", "end_date"=>"2016-12-31T00:00:00Z", "subject_areas"=>[]}
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