Elastography Study of Hamstring Behaviors during Passive Stretching
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{"title"=>"Elastography study of hamstring behaviors during passive stretching", "type"=>"journal", "authors"=>[{"first_name"=>"Guillaume", "last_name"=>"Le Sant", "scopus_author_id"=>"56968098400"}, {"first_name"=>"Filiz", "last_name"=>"Ates", "scopus_author_id"=>"13105013500"}, {"first_name"=>"Jean Louis", "last_name"=>"Brasseur", "scopus_author_id"=>"7007041899"}, {"first_name"=>"Antoine", "last_name"=>"Nordez", "scopus_author_id"=>"23036062700"}], "year"=>2015, "source"=>"PLoS ONE", "identifiers"=>{"issn"=>"19326203", "scopus"=>"2-s2.0-84947998592", "sgr"=>"84947998592", "pui"=>"607001005", "isbn"=>"1932-6203", "pmid"=>"26418862", "doi"=>"10.1371/journal.pone.0139272"}, "id"=>"279a192d-28f5-3b10-950a-ad59972e7072", "abstract"=>"INTRODUCTION: The mechanical properties of hamstring muscles are usually inferred from global passive torque/angle relationships, in combination with adjoining tissues crossing the joint investigated. Shear modulus measurement provides an estimate of changes in muscle-tendon stiffness and passive tension. This study aimed to assess the passive individual behavior of each hamstring muscle in different stretching positions using shear wave elastography.\\n\\nMETHODS/RESULTS: The muscle shear modulus of each hamstring muscle was measured during a standardized slow passive knee extension (PKE, 80% of maximal range of motion) on eighteen healthy male volunteers. Firstly, we assessed the reliability of the measurements. Results were good for semitendinosus (ST, CV: 8.9%-13.4%), semimembranosus (SM, CV: 10.3%-11.2%) and biceps femoris long-head (BF-lh, CV: 8.6%-13.3%), but not for biceps femoris short-head (BF-sh, CV: 20.3%-44.9%). Secondly, we investigated each reliable muscle in three stretch positions: 70°, 90° and 110° of hip flexion. The results showed different values of shear modulus for the same amount of perceived stretch, with the highest measurements in the high-flexed hip situation. Moreover, individual muscles displayed different values, with values increasing or BF-lh, SM and ST, respectively. The inter-subject variability was 35.3% for ST, 27.4% for SM and 30.2% for BF-lh.\\n\\nCONCLUSION: This study showed that the hip needs to be high-flexed to efficiently tension the hamstrings, and reports a higher muscle-tendon stress tolerance at 110° of hip angle. In addition muscles have different passive behaviors, and future works will clarify if it can be linked with rate of injury.", "link"=>"http://www.mendeley.com/research/elastography-study-hamstring-behaviors-during-passive-stretching", "reader_count"=>59, "reader_count_by_academic_status"=>{"Unspecified"=>5, "Professor > Associate Professor"=>2, "Researcher"=>6, "Student > Doctoral Student"=>3, "Student > Ph. D. Student"=>9, "Student > Postgraduate"=>4, "Student > Master"=>12, "Other"=>3, "Student > Bachelor"=>9, "Lecturer"=>2, "Lecturer > Senior Lecturer"=>1, "Professor"=>3}, "reader_count_by_user_role"=>{"Unspecified"=>5, "Professor > Associate Professor"=>2, "Researcher"=>6, "Student > Doctoral Student"=>3, "Student > Ph. D. Student"=>9, "Student > Postgraduate"=>4, "Student > Master"=>12, "Other"=>3, "Student > Bachelor"=>9, "Lecturer"=>2, "Lecturer > Senior Lecturer"=>1, "Professor"=>3}, "reader_count_by_subject_area"=>{"Unspecified"=>9, "Engineering"=>2, "Nursing and Health Professions"=>7, "Medicine and Dentistry"=>22, "Agricultural and Biological Sciences"=>4, "Philosophy"=>1, "Neuroscience"=>1, "Sports and Recreations"=>12, "Physics and Astronomy"=>1}, "reader_count_by_subdiscipline"=>{"Engineering"=>{"Engineering"=>2}, "Medicine and Dentistry"=>{"Medicine and Dentistry"=>22}, "Neuroscience"=>{"Neuroscience"=>1}, "Sports and Recreations"=>{"Sports and Recreations"=>12}, "Physics and Astronomy"=>{"Physics and Astronomy"=>1}, "Agricultural and Biological Sciences"=>{"Agricultural and Biological Sciences"=>4}, "Nursing and Health Professions"=>{"Nursing and Health Professions"=>7}, "Unspecified"=>{"Unspecified"=>9}, "Philosophy"=>{"Philosophy"=>1}}, "reader_count_by_country"=>{"Canada"=>1, "Japan"=>1, "United Kingdom"=>1}, "group_count"=>5}

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Figshare

  • {"files"=>["https://ndownloader.figshare.com/files/2292304"], "description"=>"<p>(A) Positioning of the subject in the reference position of the knee (90°) at a mid-flexed hip position. (B) Overview of the three stretches with range of motion: high-flexed hip position (HF-110), mid-flexed hip position (HF-90) and low-flexed hip position (HF-70).</p>", "links"=>[], "tags"=>["knee extension", "stretch positions", "Hamstring Behaviors", "hip angle", "pke", "Elastography Study", "future works", "shear modulus", "addition muscles", "Shear modulus measurement", "cv", "st", "sm", "hip flexion"], "article_id"=>1559238, "categories"=>["Uncategorised"], "users"=>["Guillaume Le Sant", "Filiz Ates", "Jean-Louis Brasseur", "Antoine Nordez"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0139272.g001", "stats"=>{"downloads"=>1, "page_views"=>8, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Schematic_representation_of_the_experimental_setup_/1559238", "title"=>"Schematic representation of the experimental setup.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2015-09-29 02:57:11"}
  • {"files"=>["https://ndownloader.figshare.com/files/2292314"], "description"=>"<p>Probe location on each hamstring muscle.</p>", "links"=>[], "tags"=>["knee extension", "stretch positions", "Hamstring Behaviors", "hip angle", "pke", "Elastography Study", "future works", "shear modulus", "addition muscles", "Shear modulus measurement", "cv", "st", "sm", "hip flexion"], "article_id"=>1559239, "categories"=>["Uncategorised"], "users"=>["Guillaume Le Sant", "Filiz Ates", "Jean-Louis Brasseur", "Antoine Nordez"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0139272.g002", "stats"=>{"downloads"=>3, "page_views"=>26, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Probe_location_on_each_hamstring_muscle_/1559239", "title"=>"Probe location on each hamstring muscle.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2015-09-29 02:57:11"}
  • {"files"=>["https://ndownloader.figshare.com/files/2292315"], "description"=>"<p>The colored region represents the map of shear elastic modulus, during the passive stretching procedure at 110° of hip flexion.</p>", "links"=>[], "tags"=>["knee extension", "stretch positions", "Hamstring Behaviors", "hip angle", "pke", "Elastography Study", "future works", "shear modulus", "addition muscles", "Shear modulus measurement", "cv", "st", "sm", "hip flexion"], "article_id"=>1559240, "categories"=>["Uncategorised"], "users"=>["Guillaume Le Sant", "Filiz Ates", "Jean-Louis Brasseur", "Antoine Nordez"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0139272.g003", "stats"=>{"downloads"=>1, "page_views"=>15, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_A_typical_shear_modulus_lengthening_relationship_for_biceps_femoris_long_head_during_the_passive_knee_extension_/1559240", "title"=>"A typical shear modulus-lengthening relationship for <i>biceps femoris</i> long-head during the passive knee extension.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2015-09-29 02:57:11"}
  • {"files"=>["https://ndownloader.figshare.com/files/2292316"], "description"=>"<p>The variability was quantified using the ratio SD/mean (in %), expressed at the maximal common knee angle in HF-110 for (A) <i>semitendinosus (ST)</i>, (B) <i>semimembranosus (SM)</i>, (C) <i>biceps-femoris</i> long head (<i>BF-lh</i>). </p>", "links"=>[], "tags"=>["knee extension", "stretch positions", "Hamstring Behaviors", "hip angle", "pke", "Elastography Study", "future works", "shear modulus", "addition muscles", "Shear modulus measurement", "cv", "st", "sm", "hip flexion"], "article_id"=>1559241, "categories"=>["Uncategorised"], "users"=>["Guillaume Le Sant", "Filiz Ates", "Jean-Louis Brasseur", "Antoine Nordez"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0139272.g004", "stats"=>{"downloads"=>3, "page_views"=>19, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Shear_modulus_lengthening_relationships_obtained_for_each_hamstring_muscle_from_the_study_participants_/1559241", "title"=>"Shear modulus-lengthening relationships obtained for each hamstring muscle from the study participants.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2015-09-29 02:57:11"}
  • {"files"=>["https://ndownloader.figshare.com/files/2292317"], "description"=>"<p>Shear modulus-lengthening relationships shown for (A) <i>semitendinosus (ST)</i>, (B) <i>semimembranosus (SM)</i>, (C) <i>biceps-femoris</i> long head (<i>BF-lh</i>), with interactions for the three same knee angles: a: between 70° and 90° of hip flexion; b: between 90° and 110° of hip flexion; c: between 70° and 110° of hip flexion. Levels of significance: * p<0.05; † p<0.001; NS: no significant at p<0.05</p>", "links"=>[], "tags"=>["knee extension", "stretch positions", "Hamstring Behaviors", "hip angle", "pke", "Elastography Study", "future works", "shear modulus", "addition muscles", "Shear modulus measurement", "cv", "st", "sm", "hip flexion"], "article_id"=>1559242, "categories"=>["Uncategorised"], "users"=>["Guillaume Le Sant", "Filiz Ates", "Jean-Louis Brasseur", "Antoine Nordez"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0139272.g005", "stats"=>{"downloads"=>3, "page_views"=>18, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Comparison_of_hamstring_responses_in_three_positions_of_passive_knee_extensions_reported_by_muscle_/1559242", "title"=>"Comparison of hamstring responses in three positions of passive knee extensions, reported by muscle.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2015-09-29 02:57:11"}
  • {"files"=>["https://ndownloader.figshare.com/files/2292320"], "description"=>"<p>Shear modulus-lengthening relationships shown for (A) 70° of hip flexion, (B) 90° of hip flexion (C) 110° of hip flexion, with interactions for the 3 same knee angles: d: between <i>ST</i> and <i>SM</i>; e: between <i>SM</i> and <i>BF-lh</i>; f: between <i>ST</i> and <i>BF-lh</i>. Levels of significance: * p<0.05; † p<0.001; NS: no significant at p<0.05</p>", "links"=>[], "tags"=>["knee extension", "stretch positions", "Hamstring Behaviors", "hip angle", "pke", "Elastography Study", "future works", "shear modulus", "addition muscles", "Shear modulus measurement", "cv", "st", "sm", "hip flexion"], "article_id"=>1559244, "categories"=>["Uncategorised"], "users"=>["Guillaume Le Sant", "Filiz Ates", "Jean-Louis Brasseur", "Antoine Nordez"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0139272.g006", "stats"=>{"downloads"=>1, "page_views"=>6, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Comparison_of_hamstrings_responses_in_the_three_positions_of_passive_knee_extension_reported_by_hip_positioning_/1559244", "title"=>"Comparison of hamstrings responses in the three positions of passive knee extension, reported by hip positioning.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2015-09-29 02:57:11"}
  • {"files"=>["https://ndownloader.figshare.com/files/2292321"], "description"=>"<p>Data are shown as mean values (± standard deviation)</p><p>Abbreviations: ROM: range of motion, ST: semitendinosus, SM: semimembranosus, BF-lh: biceps femoris long head, SEM: standard error in measurement, CV: coefficient of variation of the measurement, ICC: Interclass correlation coefficient factor</p><p>Repeatability of shear modulus measurements, for the HF-90 position.</p>", "links"=>[], "tags"=>["knee extension", "stretch positions", "Hamstring Behaviors", "hip angle", "pke", "Elastography Study", "future works", "shear modulus", "addition muscles", "Shear modulus measurement", "cv", "st", "sm", "hip flexion"], "article_id"=>1559245, "categories"=>["Uncategorised"], "users"=>["Guillaume Le Sant", "Filiz Ates", "Jean-Louis Brasseur", "Antoine Nordez"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0139272.t001", "stats"=>{"downloads"=>0, "page_views"=>3, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Repeatability_of_shear_modulus_measurements_for_the_HF_90_position_/1559245", "title"=>"Repeatability of shear modulus measurements, for the HF-90 position.", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2015-09-29 02:57:11"}
  • {"files"=>["https://ndownloader.figshare.com/files/2292322", "https://ndownloader.figshare.com/files/2292323"], "description"=>"<div><p>Introduction</p><p>The mechanical properties of hamstring muscles are usually inferred from global passive torque/angle relationships, in combination with adjoining tissues crossing the joint investigated. Shear modulus measurement provides an estimate of changes in muscle-tendon stiffness and passive tension. This study aimed to assess the passive individual behavior of each hamstring muscle in different stretching positions using shear wave elastography.</p><p>Methods/Results</p><p>The muscle shear modulus of each hamstring muscle was measured during a standardized slow passive knee extension (PKE, 80% of maximal range of motion) on eighteen healthy male volunteers. Firstly, we assessed the reliability of the measurements. Results were good for <i>semitendinosus</i> (<i>ST</i>, CV: 8.9%-13.4%), <i>semimembranosus</i> (<i>SM</i>, CV: 10.3%-11.2%) and <i>biceps femoris long-head</i> (<i>BF-lh</i>, CV: 8.6%-13.3%), but not for <i>biceps femoris short-head</i> (<i>BF-sh</i>, CV: 20.3%-44.9%). Secondly, we investigated each reliable muscle in three stretch positions: 70°, 90° and 110° of hip flexion. The results showed different values of shear modulus for the same amount of perceived stretch, with the highest measurements in the high-flexed hip situation. Moreover, individual muscles displayed different values, with values increasing or <i>BF-lh</i>, <i>SM</i> and <i>ST</i>, respectively. The inter-subject variability was 35.3% for <i>ST</i>, 27.4% for <i>SM</i> and 30.2% for <i>BF-lh</i>.</p><p>Conclusion</p><p>This study showed that the hip needs to be high-flexed to efficiently tension the hamstrings, and reports a higher muscle-tendon stress tolerance at 110° of hip angle. In addition muscles have different passive behaviors, and future works will clarify if it can be linked with rate of injury.</p></div>", "links"=>[], "tags"=>["knee extension", "stretch positions", "Hamstring Behaviors", "hip angle", "pke", "Elastography Study", "future works", "shear modulus", "addition muscles", "Shear modulus measurement", "cv", "st", "sm", "hip flexion"], "article_id"=>1559246, "categories"=>["Uncategorised"], "users"=>["Guillaume Le Sant", "Filiz Ates", "Jean-Louis Brasseur", "Antoine Nordez"], "doi"=>["https://dx.doi.org/10.1371/journal.pone.0139272.s001", "https://dx.doi.org/10.1371/journal.pone.0139272.s002"], "stats"=>{"downloads"=>4, "page_views"=>9, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Elastography_Study_of_Hamstring_Behaviors_during_Passive_Stretching_/1559246", "title"=>"Elastography Study of Hamstring Behaviors during Passive Stretching", "pos_in_sequence"=>0, "defined_type"=>4, "published_date"=>"2015-09-29 02:57:11"}

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{"start_date"=>"2015-01-01T00:00:00Z", "end_date"=>"2015-12-31T00:00:00Z", "subject_areas"=>[]}
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