08 May 2014
Pressing the nerve alters muscle fiber types of the peroneus longus in rats: Preliminary evidence for external anal sphincteroplastySong ShiACEF, Hao LiuADG, Xiaobin BaiBF, Yongxiao CaoAD
Med Sci Monit 2014; 20:752-757
BACKGROUND: Studies have demonstrated that anal reconstruction with a gracilis graft pressing the dominant nerve could be used to treat fecal incontinence. However, the detailed mechanism by this remains unknown. Herein, we evaluated the alteration in muscle fiber types and contractility of the peroneus longus muscle in rats after pressing its dominant nerves.
MATERIAL AND METHODS: The rat soleus and peroneus longus were exposed during surgery. The superficial peroneal nerve was pressed so that the peroneus longus temporarily lost its innervation. The epimysium between the soleus and the peroneus longus was removed. The end point of the soleus was cut off and the epimysium of the contact surfaces of the soleus and the peroneus longus were sutured. Five months later, peroneus longus contractility was recorded by the myograph system, and types of muscle fibers were observed using the myosin ATPase staining method.
RESULTS: The skeletal muscle fiber type underwent adaptive changes due to double innervations with both fast and slow muscle nerves. Compared with other groups, the percentage of type I fibers in the peroneus longus increased significantly in the group of rats with the pressure on the nerve and removal of the sarcolemma. The maximal contraction and relaxation time at the single twitch and complete tetanus of the peroneus longus were also increased.
CONCLUSIONS: Our results show that pressing dominant nerves alter the skeletal muscle fiber types of the peroneus longus, which lead to increased maximal contraction and relaxation time, and significantly improve the ability in resistance to fatigue in rats. This study provides a basis for future clinical studies for external anal sphincter reconstruction using gracilis grafts that are doubly innervated by pressing on its dominant nerve.
Keywords: Animals, Anal Canal - surgery, Models, Biological, Muscle Contraction, Muscle Fibers, Skeletal - pathology, Nerve Crush, Pressure, Rats, Sprague-Dawley, Sciatic Nerve - physiopathology
18 October 2021 : EditorialEditorial: Global Initiatives Support the Use and Regulation of Digital Health Technology During the COVID-19 Pandemic
Med Sci Monit 2021; 27:e935123
20 October 2021 : EditorialEditorial: The 2021 European Society of Cardiology (ESC) Guidelines on the Real-World Prevention of Atheros...
Med Sci Monit In Press; DOI: 10.12659/MSM.935172
22 October 2021 : Clinical ResearchA Novel Method for the Production of an Autologous Anti-Inflammatory and Anti-Catabolic Product (Cytorich) ...
Med Sci Monit In Press; DOI: 10.12659/MSM.934365
11 October 2021 : Clinical ResearchClinical Features and Temporal Lung Radiographic Changes in 25 Patients Recovering from COVID-19 Pneumonia:...
Med Sci Monit In Press; DOI: 10.12659/MSM.933381
22 Oct 2021 : Clinical ResearchUlnar Groove Plasty Guided by a 3D Printing Technique for Moderate to Severe Cubital Tunnel Syndrome Caused...
Med Sci Monit In Press; DOI: 10.12659/MSM.933775
22 Oct 2021 : Clinical ResearchTotal Fluoroscopy Time Reduction During Ultrasound- and Fluoroscopy-Guided Percutaneous Transhepatic Biliar...
Med Sci Monit In Press; DOI: 10.12659/MSM.933889
22 Oct 2021 : Clinical ResearchCorrelation Between Severity of Illness and Levels of Free Triiodothyronine, Interleukin-6, and Interleukin...
Med Sci Monit In Press; DOI: 10.12659/MSM.933230
Most Viewed Current Articles
20 Mar 2020 : Clinical ResearchSocial Capital and Sleep Quality in Individuals Who Self-Isolated for 14 Days During the Coronavirus Diseas...
Med Sci Monit 2020; 26:e923921
15 Apr 2020 : Clinical ResearchPsychological Impact and Coping Strategies of Frontline Medical Staff in Hunan Between January and March 20...
Med Sci Monit 2020; 26:e924171
05 May 2020 : Review articleAn Evidence Based Perspective on mRNA-SARS-CoV-2 Vaccine Development
Med Sci Monit 2020; 26:e924700