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Activation and aponeurosis morphology affect in vivo muscle tissue strains near the myotendinous junction

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Title: Activation and aponeurosis morphology affect in vivo muscle tissue strains near the myotendinous junction
Authors: Fiorentino, Niccolo M.1, Epstein, Frederick H.2,3, Blemker, Silvia S.1,2,4 ssb6n@virginia.edu
Source: Journal of Biomechanics. Feb2012, Vol. 45 Issue 4, p647-652. 6p.
Subjects: Hamstring muscle injuries, Muscles, Morphology, Tendons, Medical examinations of athletes, Physical fitness, Magnetic resonance imaging
Abstract: Abstract: Hamstring strain injury is one of the most common injuries in athletes, particularly for sports that involve high speed running. The aims of this study were to determine whether muscle activation and internal morphology influence in vivo muscle behavior and strain injury susceptibility. We measured tissue displacement and strains in the hamstring muscle injured most often, the biceps femoris long head muscle (BFLH), using cine DENSE dynamic magnetic resonance imaging. Strain measurements were used to test whether strain magnitudes are (i) larger during active lengthening than during passive lengthening and (ii) larger for subjects with a relatively narrow proximal aponeurosis than a wide proximal aponeurosis. Displacement color maps showed higher tissue displacement with increasing lateral distance from the proximal aponeurosis for both active lengthening and passive lengthening, and higher tissue displacement for active lengthening than passive lengthening. First principal strain magnitudes were averaged in a 1cm region near the myotendinous junction, where injury is most frequently observed. It was found that strains are significantly larger during active lengthening (0.19SD0.09) than passive lengthening (0.13SD0.06) (p<0.05), which suggests that elevated localized strains may be a mechanism for increased injury risk during active as opposed to passive lengthening. First principal strains were higher for subjects with a relatively narrow aponeurosis width (0.26SD 0.15) than wide (0.14SD 0.04) (p<0.05). This result suggests that athletes who have BFLH muscles with narrow proximal aponeuroses may have an increased risk for BFLH strain injuries. [Copyright &y& Elsevier]
Copyright of Journal of Biomechanics is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Activation and aponeurosis morphology affect in vivo muscle tissue strains near the myotendinous junction
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  Data: &lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Fiorentino%2C+Niccolo+M%2E%22&quot;&gt;Fiorentino, Niccolo M.&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Epstein%2C+Frederick+H%2E%22&quot;&gt;Epstein, Frederick H.&lt;/searchLink&gt;&lt;relatesTo&gt;2,3&lt;/relatesTo&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Blemker%2C+Silvia+S%2E%22&quot;&gt;Blemker, Silvia S.&lt;/searchLink&gt;&lt;relatesTo&gt;1,2,4&lt;/relatesTo&gt;&lt;i&gt; ssb6n@virginia.edu&lt;/i&gt;
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  Data: &lt;searchLink fieldCode=&quot;JN&quot; term=&quot;%22Journal+of+Biomechanics%22&quot;&gt;Journal of Biomechanics&lt;/searchLink&gt;. Feb2012, Vol. 45 Issue 4, p647-652. 6p.
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  Data: &lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Hamstring+muscle+injuries%22&quot;&gt;Hamstring muscle injuries&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Muscles%22&quot;&gt;Muscles&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Morphology%22&quot;&gt;Morphology&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Tendons%22&quot;&gt;Tendons&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Medical+examinations+of+athletes%22&quot;&gt;Medical examinations of athletes&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Physical+fitness%22&quot;&gt;Physical fitness&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Magnetic+resonance+imaging%22&quot;&gt;Magnetic resonance imaging&lt;/searchLink&gt;
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Abstract: Hamstring strain injury is one of the most common injuries in athletes, particularly for sports that involve high speed running. The aims of this study were to determine whether muscle activation and internal morphology influence in vivo muscle behavior and strain injury susceptibility. We measured tissue displacement and strains in the hamstring muscle injured most often, the biceps femoris long head muscle (BFLH), using cine DENSE dynamic magnetic resonance imaging. Strain measurements were used to test whether strain magnitudes are (i) larger during active lengthening than during passive lengthening and (ii) larger for subjects with a relatively narrow proximal aponeurosis than a wide proximal aponeurosis. Displacement color maps showed higher tissue displacement with increasing lateral distance from the proximal aponeurosis for both active lengthening and passive lengthening, and higher tissue displacement for active lengthening than passive lengthening. First principal strain magnitudes were averaged in a 1cm region near the myotendinous junction, where injury is most frequently observed. It was found that strains are significantly larger during active lengthening (0.19SD0.09) than passive lengthening (0.13SD0.06) (p&lt;0.05), which suggests that elevated localized strains may be a mechanism for increased injury risk during active as opposed to passive lengthening. First principal strains were higher for subjects with a relatively narrow aponeurosis width (0.26SD 0.15) than wide (0.14SD 0.04) (p&lt;0.05). This result suggests that athletes who have BFLH muscles with narrow proximal aponeuroses may have an increased risk for BFLH strain injuries. [Copyright &amp;y&amp; Elsevier]
– Name: AbstractSuppliedCopyright
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  Group: Ab
  Data: &lt;i&gt;Copyright of Journal of Biomechanics is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder&#39;s express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.&lt;/i&gt; (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1016/j.jbiomech.2011.12.015
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 6
        StartPage: 647
    Subjects:
      – SubjectFull: Hamstring muscle injuries
        Type: general
      – SubjectFull: Muscles
        Type: general
      – SubjectFull: Morphology
        Type: general
      – SubjectFull: Tendons
        Type: general
      – SubjectFull: Medical examinations of athletes
        Type: general
      – SubjectFull: Physical fitness
        Type: general
      – SubjectFull: Magnetic resonance imaging
        Type: general
    Titles:
      – TitleFull: Activation and aponeurosis morphology affect in vivo muscle tissue strains near the myotendinous junction
        Type: main
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            NameFull: Fiorentino, Niccolo M.
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            NameFull: Epstein, Frederick H.
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            NameFull: Blemker, Silvia S.
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              M: 02
              Text: Feb2012
              Type: published
              Y: 2012
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              Value: 45
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