Decreased Variability of the 6-Minute Walk Test by Heart Rate Correction in Patients with Neuromuscular Disease
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{"title"=>"Decreased variability of the 6-minute walk test by heart rate correction in patients with neuromuscular disease", "type"=>"journal", "authors"=>[{"first_name"=>"Kira P.", "last_name"=>"Prahm", "scopus_author_id"=>"56076363300"}, {"first_name"=>"Nanna", "last_name"=>"Witting", "scopus_author_id"=>"6602870065"}, {"first_name"=>"John", "last_name"=>"Vissing", "scopus_author_id"=>"7005973881"}], "year"=>2014, "source"=>"PLoS ONE", "identifiers"=>{"sgr"=>"84917706514", "doi"=>"10.1371/journal.pone.0114273", "issn"=>"19326203", "pui"=>"600696808", "isbn"=>"1932-6203 (Electronic)\\r1932-6203 (Linking)", "pmid"=>"25479403", "scopus"=>"2-s2.0-84917706514"}, "id"=>"b764bf7d-2bc4-345d-89e8-6665c2b5e4a3", "abstract"=>"OBJECTIVE: The 6-minute walk test is widely used to assess functional status in neurological disorders. However, the test is subject to great inter-test variability due to fluctuating motivation, fatigue and learning effects. We investigated whether inter-test variability of the 6MWT can be reduced by heart rate correction.\\n\\nMETHODS: Sixteen patients with neuromuscular diseases, including Facioscapulohumeral muscular dystrophy, Limb-girdle muscular dystrophy, Charcot-Marie-Tooths, Dystrophia Myotonica and Congenital Myopathy and 12 healthy subjects were studied. Patients were excluded if they had cardiac arrhythmias, if they received drug treatment for hypertension or any other medical conditions that could interfere with the interpretation of the heart rate and walking capability. All completed three 6-minute walk tests on three different test-days. Heart rate was measured continuously.\\n\\nRESULTS: Successive standard 6-minute walk tests showed considerable learning effects between Tests 1 and 2 (4.9%; P = 0.026), and Tests 2 and 3 (4.5%; P = 0.020) in patients. The same was seen in controls between Tests 1 and 2 (8.1%; P = 0.039)). Heart rate correction abolished this learning effect.\\n\\nCONCLUSION: A modified 6-minute walk test, by correcting walking distance with average heart rate during walking, decreases the variability among repeated 6-minute walk tests, and should be considered as an alternative outcome measure to the standard 6-minute walk test in future clinical follow-up and treatment trials.", "link"=>"http://www.mendeley.com/research/decreased-variability-6minute-walk-test-heart-rate-correction-patients-neuromuscular-disease", "reader_count"=>27, "reader_count_by_academic_status"=>{"Unspecified"=>2, "Researcher"=>5, "Student > Doctoral Student"=>2, "Student > Ph. D. Student"=>8, "Student > Postgraduate"=>3, "Other"=>2, "Student > Master"=>3, "Student > Bachelor"=>1, "Professor"=>1}, "reader_count_by_user_role"=>{"Unspecified"=>2, "Researcher"=>5, "Student > Doctoral Student"=>2, "Student > Ph. D. Student"=>8, "Student > Postgraduate"=>3, "Other"=>2, "Student > Master"=>3, "Student > Bachelor"=>1, "Professor"=>1}, "reader_count_by_subject_area"=>{"Unspecified"=>4, "Engineering"=>2, "Nursing and Health Professions"=>2, "Medicine and Dentistry"=>7, "Agricultural and Biological Sciences"=>3, "Sports and Recreations"=>4, "Psychology"=>2, "Social Sciences"=>2, "Economics, Econometrics and Finance"=>1}, "reader_count_by_subdiscipline"=>{"Engineering"=>{"Engineering"=>2}, "Medicine and Dentistry"=>{"Medicine and Dentistry"=>7}, "Social Sciences"=>{"Social Sciences"=>2}, "Sports and Recreations"=>{"Sports and Recreations"=>4}, "Psychology"=>{"Psychology"=>2}, "Economics, Econometrics and Finance"=>{"Economics, Econometrics and Finance"=>1}, "Agricultural and Biological Sciences"=>{"Agricultural and Biological Sciences"=>3}, "Nursing and Health Professions"=>{"Nursing and Health Professions"=>2}, "Unspecified"=>{"Unspecified"=>4}}, "reader_count_by_country"=>{"Nigeria"=>1}, "group_count"=>3}

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Figshare

  • {"files"=>["https://ndownloader.figshare.com/files/1825853"], "description"=>"<p>A. Mean distance walked in all 6-minute walk tests, for both patients and controls. The graph shows the significant increases, marked by the <i>p</i>-value, in mean walked distance among tests. B. Heart rate corrected 6-minute walk distance in all 6-minute walk tests, for both patients and controls. No significant difference between walked distances was observed.</p>", "links"=>[], "tags"=>["Tests 1", "mwt", "variability", "heart rate correction.MethodsSixteen patients", "heart rate", "heart rate correction", "alternative outcome measure"], "article_id"=>1262421, "categories"=>["Biological Sciences", "Science Policy"], "users"=>["Kira P. Prahm", "Nanna Witting", "John Vissing"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0114273.g001", "stats"=>{"downloads"=>3, "page_views"=>13, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Distance_walked_with_and_without_heart_rate_correction_/1262421", "title"=>"Distance walked with, and without heart rate correction.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2014-12-05 02:56:56"}
  • {"files"=>["https://ndownloader.figshare.com/files/1825854"], "description"=>"<p>The graph shows the Pearson's correlation between heart rate and walked distance for both patients and controls.</p>", "links"=>[], "tags"=>["Tests 1", "mwt", "variability", "heart rate correction.MethodsSixteen patients", "heart rate", "heart rate correction", "alternative outcome measure"], "article_id"=>1262422, "categories"=>["Biological Sciences", "Science Policy"], "users"=>["Kira P. Prahm", "Nanna Witting", "John Vissing"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0114273.g002", "stats"=>{"downloads"=>3, "page_views"=>22, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Correlation_between_heart_rate_and_6_minute_walk_distance_/1262422", "title"=>"Correlation between heart rate and 6-minute walk distance.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2014-12-05 02:56:56"}
  • {"files"=>["https://ndownloader.figshare.com/files/1825855"], "description"=>"<p>Abbreviations: LMGD  =  Limb-girdle muscular dystrophy, DM  =  Myotonic dystrophy, CMT  =  Charcot-Marie-Tooth disease, CM  =  Congenital myopathy, FSH  =  Facioscapulohumeral muscular dystrophy, MRC  =  Medical Research Council Scale, (F/E)  =  Flexion/Extension, R =  right, L =  left.</p><p>Gene mutations and muscle strength in 16 patients with neuromuscular disorders.</p>", "links"=>[], "tags"=>["Tests 1", "mwt", "variability", "heart rate correction.MethodsSixteen patients", "heart rate", "heart rate correction", "alternative outcome measure"], "article_id"=>1262423, "categories"=>["Biological Sciences", "Science Policy"], "users"=>["Kira P. Prahm", "Nanna Witting", "John Vissing"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0114273.t001", "stats"=>{"downloads"=>1, "page_views"=>10, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Gene_mutations_and_muscle_strength_in_16_patients_with_neuromuscular_disorders_/1262423", "title"=>"Gene mutations and muscle strength in 16 patients with neuromuscular disorders.", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2014-12-05 02:56:56"}
  • {"files"=>["https://ndownloader.figshare.com/files/1825856"], "description"=>"<p>Walked distance during each test for patients and controls.</p>", "links"=>[], "tags"=>["Tests 1", "mwt", "variability", "heart rate correction.MethodsSixteen patients", "heart rate", "heart rate correction", "alternative outcome measure"], "article_id"=>1262424, "categories"=>["Biological Sciences", "Science Policy"], "users"=>["Kira P. Prahm", "Nanna Witting", "John Vissing"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0114273.t002", "stats"=>{"downloads"=>1, "page_views"=>5, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Walked_distance_during_each_test_for_patients_and_controls_/1262424", "title"=>"Walked distance during each test for patients and controls.", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2014-12-05 02:56:56"}
  • {"files"=>["https://ndownloader.figshare.com/files/1825857"], "description"=>"<p>M =  male, F =  female, BMI  =  body mass index. *<i>P</i><0.05.</p><p>Characteristics of patients and controls.</p>", "links"=>[], "tags"=>["Tests 1", "mwt", "variability", "heart rate correction.MethodsSixteen patients", "heart rate", "heart rate correction", "alternative outcome measure"], "article_id"=>1262425, "categories"=>["Biological Sciences", "Science Policy"], "users"=>["Kira P. Prahm", "Nanna Witting", "John Vissing"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0114273.t003", "stats"=>{"downloads"=>1, "page_views"=>5, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Characteristics_of_patients_and_controls_/1262425", "title"=>"Characteristics of patients and controls.", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2014-12-05 02:56:56"}
  • {"files"=>["https://ndownloader.figshare.com/files/1825859", "https://ndownloader.figshare.com/files/1825860"], "description"=>"<div><p>Objective</p><p>The 6-minute walk test is widely used to assess functional status in neurological disorders. However, the test is subject to great inter-test variability due to fluctuating motivation, fatigue and learning effects. We investigated whether inter-test variability of the 6MWT can be reduced by heart rate correction.</p><p>Methods</p><p>Sixteen patients with neuromuscular diseases, including Facioscapulohumeral muscular dystrophy, Limb-girdle muscular dystrophy, Charcot-Marie-Tooths, Dystrophia Myotonica and Congenital Myopathy and 12 healthy subjects were studied. Patients were excluded if they had cardiac arrhythmias, if they received drug treatment for hypertension or any other medical conditions that could interfere with the interpretation of the heart rate and walking capability. All completed three 6-minute walk tests on three different test-days. Heart rate was measured continuously.</p><p>Results</p><p>Successive standard 6-minute walk tests showed considerable learning effects between Tests 1 and 2 (4.9%; <i>P</i> = 0.026), and Tests 2 and 3 (4.5%; <i>P</i> = 0.020) in patients. The same was seen in controls between Tests 1 and 2 (8.1%; <i>P</i> = 0.039)). Heart rate correction abolished this learning effect.</p><p>Conclusion</p><p>A modified 6-minute walk test, by correcting walking distance with average heart rate during walking, decreases the variability among repeated 6-minute walk tests, and should be considered as an alternative outcome measure to the standard 6-minute walk test in future clinical follow-up and treatment trials.</p></div>", "links"=>[], "tags"=>["Tests 1", "mwt", "variability", "heart rate correction.MethodsSixteen patients", "heart rate", "heart rate correction", "alternative outcome measure"], "article_id"=>1262427, "categories"=>["Biological Sciences", "Science Policy"], "users"=>["Kira P. Prahm", "Nanna Witting", "John Vissing"], "doi"=>["https://dx.doi.org/10.1371/journal.pone.0114273.s001", "https://dx.doi.org/10.1371/journal.pone.0114273.s002"], "stats"=>{"downloads"=>10, "page_views"=>12, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Decreased_Variability_of_the_6_Minute_Walk_Test_by_Heart_Rate_Correction_in_Patients_with_Neuromuscular_Disease_/1262427", "title"=>"Decreased Variability of the 6-Minute Walk Test by Heart Rate Correction in Patients with Neuromuscular Disease", "pos_in_sequence"=>0, "defined_type"=>4, "published_date"=>"2014-12-05 02:56:56"}

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