Can Cognitive Activities during Breaks in Repetitive Manual Work Accelerate Recovery from Fatigue? A Controlled Experiment
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{"title"=>"Can cognitive activities during breaks in repetitive manual work accelerate recovery from fatigue? A controlled experiment", "type"=>"journal", "authors"=>[{"first_name"=>"Svend Erik", "last_name"=>"Mathiassen", "scopus_author_id"=>"7003473142"}, {"first_name"=>"David M.", "last_name"=>"Hallman", "scopus_author_id"=>"35233212900"}, {"first_name"=>"Eugene", "last_name"=>"Lyskov", "scopus_author_id"=>"7004000995"}, {"first_name"=>"Staffan", "last_name"=>"Hygge", "scopus_author_id"=>"6603898262"}], "year"=>2014, "source"=>"PLoS ONE", "identifiers"=>{"doi"=>"10.1371/journal.pone.0112090", "sgr"=>"84910643695", "isbn"=>"1932-6203", "pmid"=>"25375644", "issn"=>"19326203", "scopus"=>"2-s2.0-84910643695", "pui"=>"600434931"}, "id"=>"83605192-f187-3340-84df-52410ac08623", "abstract"=>"Neurophysiologic theory and some empirical evidence suggest that fatigue caused by physical work may be more effectively recovered during \"diverting\" periods of cognitive activity than during passive rest; a phenomenon of great interest in working life. We investigated the extent to which development and recovery of fatigue during repeated bouts of an occupationally relevant reaching task was influenced by the difficulty of a cognitive activity between these bouts. Eighteen male volunteers performed three experimental sessions, consisting of six 7-min bouts of reaching alternating with 3 minutes of a memory test differing in difficulty between sessions. Throughout each session, recordings were made of upper trapezius muscle activity using electromyography (EMG), heart rate and heart rate variability (HRV) using electrocardiography, arterial blood pressure, and perceived fatigue (Borg CR10 scale and SOFI). A test battery before, immediately after and 1 hour after the work period included measurements of maximal shoulder elevation strength (MVC), pressure pain threshold (PPT) over the trapezius muscles, and a submaximal isometric contraction. As expected, perceived fatigue and EMG amplitude increased during the physical work bouts. Recovery did occur between the bouts, but fatigue accumulated throughout the work period. Neither EMG changes nor recovery of perceived fatigue during breaks were influenced by cognitive task difficulty, while heart rate and HRV recovered the most during breaks with the most difficult task. Recovery of perceived fatigue after the 1 hour work period was also most pronounced for the most difficult cognitive condition, while MVC and PPT showed ambiguous patterns, and EMG recovered similarly after all three cognitive protocols. Thus, we could confirm that cognitive tasks between bouts of fatiguing physical work can, indeed, accelerate recovery of some factors associated with fatigue, even if benefits may be moderate and some responses may be equivocal. Our results encourage further research into combinations of physical and mental tasks in an occupational context.", "link"=>"http://www.mendeley.com/research/cognitive-activities-during-breaks-repetitive-manual-work-accelerate-recovery-fatigue-controlled-exp", "reader_count"=>44, "reader_count_by_academic_status"=>{"Unspecified"=>1, "Professor > Associate Professor"=>2, "Librarian"=>2, "Student > Doctoral Student"=>5, "Researcher"=>2, "Student > Ph. D. Student"=>9, "Student > Postgraduate"=>4, "Other"=>1, "Student > Master"=>11, "Student > Bachelor"=>3, "Lecturer"=>2, "Professor"=>2}, "reader_count_by_user_role"=>{"Unspecified"=>1, "Professor > Associate Professor"=>2, "Librarian"=>2, "Student > Doctoral Student"=>5, "Researcher"=>2, "Student > Ph. D. Student"=>9, "Student > Postgraduate"=>4, "Other"=>1, "Student > Master"=>11, "Student > Bachelor"=>3, "Lecturer"=>2, "Professor"=>2}, "reader_count_by_subject_area"=>{"Unspecified"=>3, "Agricultural and Biological Sciences"=>3, "Arts and Humanities"=>1, "Engineering"=>6, "Environmental Science"=>1, "Nursing and Health Professions"=>3, "Biochemistry, Genetics and Molecular Biology"=>1, "Medicine and Dentistry"=>8, "Neuroscience"=>1, "Design"=>1, "Sports and Recreations"=>6, "Psychology"=>7, "Social Sciences"=>3}, "reader_count_by_subdiscipline"=>{"Medicine and Dentistry"=>{"Medicine and Dentistry"=>8}, "Social Sciences"=>{"Social Sciences"=>3}, "Sports and Recreations"=>{"Sports and Recreations"=>6}, "Psychology"=>{"Psychology"=>7}, "Unspecified"=>{"Unspecified"=>3}, "Environmental Science"=>{"Environmental Science"=>1}, "Arts and Humanities"=>{"Arts and Humanities"=>1}, "Design"=>{"Design"=>1}, "Engineering"=>{"Engineering"=>6}, "Neuroscience"=>{"Neuroscience"=>1}, "Agricultural and Biological Sciences"=>{"Agricultural and Biological Sciences"=>3}, "Nursing and Health Professions"=>{"Nursing and Health Professions"=>3}, "Biochemistry, Genetics and Molecular Biology"=>{"Biochemistry, Genetics and Molecular Biology"=>1}}, "reader_count_by_country"=>{"Portugal"=>1}, "group_count"=>5}

Scopus | Further Information

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Figshare

  • {"files"=>["https://ndownloader.figshare.com/files/1781867"], "description"=>"<p>The protocol (Figure 1a) included six 7-minute bouts of a repetitive reaching task, interspersed by 5-minute breaks comprising two ratings of perceived fatigue and a 3-minute mental task. A test battery (TB, Figure 1b) was performed before, immediately after, and one hour after the work period. Both x-axes show time in minutes. EMG, electromyography; ECG, electrocardiography; BP, blood pressure; MVC, maximal voluntary contraction; PPT, pressure pain threshold; TC, test contraction.</p>", "links"=>[], "tags"=>["trapezius muscle activity", "bout", "Borg CR 10 scale", "hrv", "submaximal isometric contraction", "emg", "difficulty", "work period", "shoulder elevation strength", "Controlled Experiment Neurophysiologic theory", "Work Accelerate Recovery", "Heart rate variability", "mvc", "recovery", "ppt", "1 hour work period", "SOFI", "fatigue", "task"], "article_id"=>1231014, "categories"=>["Biological Sciences"], "users"=>["Svend Erik Mathiassen", "David M. Hallman", "Eugene Lyskov", "Staffan Hygge"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0112090.g001", "stats"=>{"downloads"=>1, "page_views"=>12, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Experimental_protocol_and_test_battery_/1231014", "title"=>"Experimental protocol and test battery.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2014-11-06 04:03:24"}
  • {"files"=>["https://ndownloader.figshare.com/files/1781868"], "description"=>"<p>EMG amplitude during the first and last minute of each of the six work bouts; mean across subjects and mental task conditions. X-axis shows time after commencing work; black zones mark physical work bouts. Filled and empty symbols with full-drawn and dashed line: ipsi- and contralateral trapezius EMG, respectively.</p>", "links"=>[], "tags"=>["trapezius muscle activity", "bout", "Borg CR 10 scale", "hrv", "submaximal isometric contraction", "emg", "difficulty", "work period", "shoulder elevation strength", "Controlled Experiment Neurophysiologic theory", "Work Accelerate Recovery", "Heart rate variability", "mvc", "recovery", "ppt", "1 hour work period", "SOFI", "fatigue", "task"], "article_id"=>1231015, "categories"=>["Biological Sciences"], "users"=>["Svend Erik Mathiassen", "David M. Hallman", "Eugene Lyskov", "Staffan Hygge"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0112090.g002", "stats"=>{"downloads"=>0, "page_views"=>15, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Trapezius_EMG_amplitude_during_the_work_period_/1231015", "title"=>"Trapezius EMG amplitude during the work period.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2014-11-06 04:03:24"}
  • {"files"=>["https://ndownloader.figshare.com/files/1781869"], "description"=>"<p>Heart rate (measured by inter-beat ECG intervals) during work and breaks in the easy (MT1, green squares), medium (MT2, blue circles), and difficult (MT3, red triangles) mental task protocols. X-axis shows time after commencing work; black zones mark physical work bouts.</p>", "links"=>[], "tags"=>["trapezius muscle activity", "bout", "Borg CR 10 scale", "hrv", "submaximal isometric contraction", "emg", "difficulty", "work period", "shoulder elevation strength", "Controlled Experiment Neurophysiologic theory", "Work Accelerate Recovery", "Heart rate variability", "mvc", "recovery", "ppt", "1 hour work period", "SOFI", "fatigue", "task"], "article_id"=>1231016, "categories"=>["Biological Sciences"], "users"=>["Svend Erik Mathiassen", "David M. Hallman", "Eugene Lyskov", "Staffan Hygge"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0112090.g003", "stats"=>{"downloads"=>0, "page_views"=>9, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Heart_rate_during_the_work_period_/1231016", "title"=>"Heart rate during the work period.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2014-11-06 04:03:24"}
  • {"files"=>["https://ndownloader.figshare.com/files/1781870"], "description"=>"<p>Perceived fatigue rated on, (a) the Borg CR10 scale, (b) <i>aching</i> in SOFI, and (c) <i>spent</i> in SOFI; before and after work in the easy (MT1, green), medium (MT2, blue) and difficult (MT3, red) mental task protocols. Mean values; bars illustrating SD between subjects. Text and numbers above columns mark differences in recovery between mental task conditions reaching a p-value less than 0.10. As an example, for <i>spent</i> the change from post-work0h to post-work1h differed between M1 and M3 at a p = 0.05 level of significance.</p>", "links"=>[], "tags"=>["trapezius muscle activity", "bout", "Borg CR 10 scale", "hrv", "submaximal isometric contraction", "emg", "difficulty", "work period", "shoulder elevation strength", "Controlled Experiment Neurophysiologic theory", "Work Accelerate Recovery", "Heart rate variability", "mvc", "recovery", "ppt", "1 hour work period", "SOFI", "fatigue", "task"], "article_id"=>1231017, "categories"=>["Biological Sciences"], "users"=>["Svend Erik Mathiassen", "David M. Hallman", "Eugene Lyskov", "Staffan Hygge"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0112090.g004", "stats"=>{"downloads"=>0, "page_views"=>17, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Ratings_of_perceived_fatigue_before_immediately_after_and_one_hour_after_the_work_period_/1231017", "title"=>"Ratings of perceived fatigue before, immediately after, and one hour after the work period.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2014-11-06 04:03:24"}
  • {"files"=>["https://ndownloader.figshare.com/files/1781871"], "description"=>"a<p>: EMG amplitude expressed in percent of the pre-work reference contraction value.</p>b<p>: Main effect of TB tested using one sample t-tests for post-work0h and post-work1h values pooled across MT against the reference pre-work value (100); interaction effect (TB × MT) investigated by testing for the effect of MT in three separate ANOVAs on results from post-work0h, post-work1h, and the difference between post-work0h and post-work1h.</p><p>MVC, Maximum voluntary contraction; PPT, Pressure pain threshold; MT1, MT2, MT3, easy, medium and difficult mental task; TB, Test battery.</p><p>Table shows mean (SD between subjects) values of MVC, PPT and reference contraction EMG amplitude in the three test batteries (TB) preceding work, immediately after work and one hour into recovery after work including the three mental tasks (MT1, MT2, MT3). Right-most columns show results of the ANOVA tests (p-values less than 0.05 in bold) for a main effect of TB and an interaction TB × MT.</p><p>Pre-work baseline values of maximal strength, pressure pain threshold and reference contraction EMG amplitude, and their recovery after work.</p>", "links"=>[], "tags"=>["trapezius muscle activity", "bout", "Borg CR 10 scale", "hrv", "submaximal isometric contraction", "emg", "difficulty", "work period", "shoulder elevation strength", "Controlled Experiment Neurophysiologic theory", "Work Accelerate Recovery", "Heart rate variability", "mvc", "recovery", "ppt", "1 hour work period", "SOFI", "fatigue", "task"], "article_id"=>1231018, "categories"=>["Biological Sciences"], "users"=>["Svend Erik Mathiassen", "David M. Hallman", "Eugene Lyskov", "Staffan Hygge"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0112090.t001", "stats"=>{"downloads"=>2, "page_views"=>18, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Pre_work_baseline_values_of_maximal_strength_pressure_pain_threshold_and_reference_contraction_EMG_amplitude_and_their_recovery_after_work_/1231018", "title"=>"Pre-work baseline values of maximal strength, pressure pain threshold and reference contraction EMG amplitude, and their recovery after work.", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2014-11-06 04:03:24"}
  • {"files"=>["https://ndownloader.figshare.com/files/1781872"], "description"=>"<p>MT1, MT2, MT3; easy, medium and difficult mental task.</p><p>The difference between work blocks 1 and 6 of perceived fatigue, and of ipsi- and contralateral trapezius EMG variables (means (SD between subjects)) is shown for each of the mental tasks (MT1, MT2, MT3); together with the corresponding results of the ANOVA tests, based on all six work blocks, for main effects and interaction of work bout (WB) and mental task (MT) condition (p-values less than 0.05 in bold).</p><p>Development of perceived fatigue and muscle activity during work.</p>", "links"=>[], "tags"=>["trapezius muscle activity", "bout", "Borg CR 10 scale", "hrv", "submaximal isometric contraction", "emg", "difficulty", "work period", "shoulder elevation strength", "Controlled Experiment Neurophysiologic theory", "Work Accelerate Recovery", "Heart rate variability", "mvc", "recovery", "ppt", "1 hour work period", "SOFI", "fatigue", "task"], "article_id"=>1231019, "categories"=>["Biological Sciences"], "users"=>["Svend Erik Mathiassen", "David M. Hallman", "Eugene Lyskov", "Staffan Hygge"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0112090.t002", "stats"=>{"downloads"=>1, "page_views"=>19, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Development_of_perceived_fatigue_and_muscle_activity_during_work_/1231019", "title"=>"Development of perceived fatigue and muscle activity during work.", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2014-11-06 04:03:24"}
  • {"files"=>["https://ndownloader.figshare.com/files/1781873"], "description"=>"a<p>: scores were calculated by subtracting the value during work from the value during the subsequent break.</p><p>IBI, inter-beat interval. For Heart rate variability metrics, see <a href=\"http://www.plosone.org/article/info:doi/10.1371/journal.pone.0112090#s2\" target=\"_blank\">methods</a> section. MT1, MT2, MT3; easy, medium and difficult mental task.</p><p>Recovery of heart rate, heart rate variability, and blood pressure during the break after each bout of physical work (WB1-WB6), stratified by mental task (MT1, MT2, MT3); mean (SD between subjects)<sup><a href=\"http://www.plosone.org/article/info:doi/10.1371/journal.pone.0112090#nt107\" target=\"_blank\">a</a></sup>.</p>", "links"=>[], "tags"=>["trapezius muscle activity", "bout", "Borg CR 10 scale", "hrv", "submaximal isometric contraction", "emg", "difficulty", "work period", "shoulder elevation strength", "Controlled Experiment Neurophysiologic theory", "Work Accelerate Recovery", "Heart rate variability", "mvc", "recovery", "ppt", "1 hour work period", "SOFI", "fatigue", "task"], "article_id"=>1231020, "categories"=>["Biological Sciences"], "users"=>["Svend Erik Mathiassen", "David M. Hallman", "Eugene Lyskov", "Staffan Hygge"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0112090.t003", "stats"=>{"downloads"=>0, "page_views"=>16, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Recovery_of_heart_rate_heart_rate_variability_and_blood_pressure_during_the_break_after_each_bout_of_physical_work_WB1_WB6_stratified_by_mental_task_MT1_MT2_MT3_mean_SD_between_subjects_a_/1231020", "title"=>"Recovery of heart rate, heart rate variability, and blood pressure during the break after each bout of physical work (WB1-WB6), stratified by mental task (MT1, MT2, MT3); mean (SD between subjects)<sup>a</sup>.", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2014-11-06 04:03:24"}
  • {"files"=>["https://ndownloader.figshare.com/files/1781874"], "description"=>"<div><p>Neurophysiologic theory and some empirical evidence suggest that fatigue caused by physical work may be more effectively recovered during “diverting” periods of cognitive activity than during passive rest; a phenomenon of great interest in working life. We investigated the extent to which development and recovery of fatigue during repeated bouts of an occupationally relevant reaching task was influenced by the difficulty of a cognitive activity between these bouts. Eighteen male volunteers performed three experimental sessions, consisting of six 7-min bouts of reaching alternating with 3 minutes of a memory test differing in difficulty between sessions. Throughout each session, recordings were made of upper trapezius muscle activity using electromyography (EMG), heart rate and heart rate variability (HRV) using electrocardiography, arterial blood pressure, and perceived fatigue (Borg CR10 scale and SOFI). A test battery before, immediately after and 1 hour after the work period included measurements of maximal shoulder elevation strength (MVC), pressure pain threshold (PPT) over the trapezius muscles, and a submaximal isometric contraction. As expected, perceived fatigue and EMG amplitude increased during the physical work bouts. Recovery did occur between the bouts, but fatigue accumulated throughout the work period. Neither EMG changes nor recovery of perceived fatigue during breaks were influenced by cognitive task difficulty, while heart rate and HRV recovered the <i>most</i> during breaks with the most difficult task. Recovery of perceived fatigue after the 1 hour work period was also most pronounced for the most difficult cognitive condition, while MVC and PPT showed ambiguous patterns, and EMG recovered similarly after all three cognitive protocols. Thus, we could confirm that cognitive tasks between bouts of fatiguing physical work can, indeed, accelerate recovery of some factors associated with fatigue, even if benefits may be moderate and some responses may be equivocal. Our results encourage further research into combinations of physical and mental tasks in an occupational context.</p></div>", "links"=>[], "tags"=>["trapezius muscle activity", "bout", "Borg CR 10 scale", "hrv", "submaximal isometric contraction", "emg", "difficulty", "work period", "shoulder elevation strength", "Controlled Experiment Neurophysiologic theory", "Work Accelerate Recovery", "Heart rate variability", "mvc", "recovery", "ppt", "1 hour work period", "SOFI", "fatigue", "task"], "article_id"=>1231021, "categories"=>["Biological Sciences"], "users"=>["Svend Erik Mathiassen", "David M. Hallman", "Eugene Lyskov", "Staffan Hygge"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0112090", "stats"=>{"downloads"=>7, "page_views"=>25, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Can_Cognitive_Activities_during_Breaks_in_Repetitive_Manual_Work_Accelerate_Recovery_from_Fatigue_A_Controlled_Experiment_/1231021", "title"=>"Can Cognitive Activities during Breaks in Repetitive Manual Work Accelerate Recovery from Fatigue? A Controlled Experiment", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2014-11-06 04:03:24"}

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Relative Metric

{"start_date"=>"2014-01-01T00:00:00Z", "end_date"=>"2014-12-31T00:00:00Z", "subject_areas"=>[{"subject_area"=>"/Biology and life sciences", "average_usage"=>[291]}, {"subject_area"=>"/Medicine and health sciences/Anatomy", "average_usage"=>[266]}, {"subject_area"=>"/Medicine and health sciences/Vascular medicine", "average_usage"=>[248]}, {"subject_area"=>"/Physical sciences/Mathematics", "average_usage"=>[286]}]}
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