Estimating myofiber cross‐sectional area and connective tissue deposition with electrical impedance myography: a study in D2 ‐mdx mice

2021 ◽  
Author(s):  
Sarbesh R. Pandeya ◽  
Janice A. Nagy ◽  
Daniela Riveros ◽  
Carson Semple ◽  
Rebecca S. Taylor ◽  
...  
Keyword(s):  
Connective Tissue ◽  
Electrical Impedance ◽  
Cross Sectional Area ◽  
Mdx Mice ◽  
Sectional Area ◽  
Cross Sectional

scholarly journals Predicting myofiber cross‐sectional area and triglyceride content with electrical impedance myography: A study in db/db mice

2020 ◽  
Vol 63 (1) ◽  
pp. 127-140
Author(s):  
Sarbesh R. Pandeya ◽  
Janice A. Nagy ◽  
Daniela Riveros ◽  
Carson Semple ◽  
Rebecca S. Taylor ◽  
...  
Keyword(s):  
Electrical Impedance ◽  
Cross Sectional Area ◽  
Sectional Area ◽  
Cross Sectional ◽  
Triglyceride Content

Muscle fiber architecture of the dog diaphragm

1998 ◽  
Vol 84 (1) ◽  
pp. 318-326 ◽  
Author(s):  
Aladin M. Boriek ◽  
Charles C. Miller ◽  
Joseph R. Rodarte
Keyword(s):  
Connective Tissue ◽  
Muscle Fiber ◽  
Neuromuscular Junctions ◽  
Muscle Fibers ◽  
Cross Sectional Area ◽  
Sectional Area ◽  
Fiber Architecture ◽  
Cross Sectional ◽  
Diaphragmatic Muscle ◽  
Muscle Fiber Architecture

Boriek, Aladin M., Charles C. Miller III, and Joseph R. Rodarte. Muscle fiber architecture of the dog diaphragm. J. Appl. Physiol. 84(1): 318–326, 1998.—Previous measurements of muscle thickness and length ratio of costal diaphragm insertions in the dog (A. M. Boriek and J. R. Rodarte. J. Appl. Physiol. 77: 2065–2070, 1994) suggested, but did not prove, discontinuous muscle fiber architecture. We examined diaphragmatic muscle fiber architecture using morphological and histochemical methods. In 15 mongrel dogs, transverse sections along the length of the muscle fibers were analyzed morphometrically at ×20, by using the BioQuant System IV software. We measured fiber diameters, cross-sectional fiber shapes, and cross-sectional area distributions of fibers. We also determined numbers of muscle fibers per cross-sectional area and ratio of connective tissue to muscle fibers along a course of the muscle from near the chest wall (CW) to near the central tendon (CT) for midcostal left and right hemidiaphragms, as well as ventral, middle, and dorsal regions of the left costal hemidiaphragm. In six other mongrel dogs, the macroscopic distribution of neuromuscular junctions (NMJ) on thoracic and abdominal diaphragm surfaces was determined by staining the intact diaphragmatic muscle for acetylcholinesterase activity. The average major diameter of muscle fibers was significantly smaller, and the number of fibers was significantly larger midspan between CT and CW than near the insertions. The ratio of connective tissues to muscle fibers was largest at CW compared with other regions along the length of the muscle. The diaphragm is transversely crossed by multiple scattered NMJ bands with fairly regular intervals offset in adjacent strips. Muscle fascicles traverse two to five NMJ, consistent with fibers that do not span the entire fascicle from CT to CW. These results suggest that the diaphragm has a discontinuous fiber architecture in which contractile forces may be transmitted among the muscle fibers through the connective tissue adjacent to the fibers.

scholarly journals Morphological and Functional Characteristics of the Peroneus Muscles in Patients with Lateral Ankle Sprain: An Ultrasound-Based Study

Medicina ◽  
2022 ◽  
Vol 58 (1) ◽  
pp. 70
Author(s):  
Satoshi Arima ◽  
Noriaki Maeda ◽  
Makoto Komiya ◽  
Tsubasa Tashiro ◽  
Kazuki Fukui ◽  
...  
Keyword(s):  
Connective Tissue ◽  
Ankle Sprain ◽  
Cross Sectional Area ◽  
Sectional Area ◽  
Cross Sectional ◽  
Lateral Ankle Sprain ◽  
Lateral Ankle ◽  
Leg Muscle ◽  
And Control ◽  
Muscle Cross Sectional Area

Background and Objectives: The effectiveness of multiple ultrasound evaluations of the peroneus muscles morphology, including muscle cross-sectional area (CSA) and connective tissue, after lateral ankle sprain (LAS) is unknown. This study aimed to measure the peroneus muscles after LAS at three points, adding distal 75% to the conventional measurement points, in order to obtain a detailed understanding of the post-injury morphology and to propose a new evaluation index of the peroneus muscles for multiple LAS. Materials and Methods: Participants with and without LAS (LAS and control groups, 16 each) were recruited. The muscle cross-sectional area (CSA) and muscle echogenicity were measured using a B-mode ultrasound system at 25%, 50%, and 75% proximal to the line connecting the fibular head to the lateral malleolus. The ankle evertor strength was measured using a handheld dynamometer. Simultaneously, the peroneus longus (PL) and peroneus brevis (PB) muscle activities were measured using surface electromyography. Measurements for the LAS side, non-LAS side, and control leg were performed separately. Results: The CSA was significantly higher at 75% on the LAS side than on the non-LAS side and in the control leg. Muscle echogenicity of the LAS side at 75% was significantly lower than that of the non-LAS side and the control leg. Muscle activity of the PL was significantly lower and the PB was higher on the LAS side than on the non-LAS side and in the control leg. Conclusions: The PL was less active than the PB, while the PB was found to be overactive, suggesting that PB hypertrophy occurs due to an increase in the percentage of muscle fibers and a decrease in the connective tissue. Therefore, it is necessary to evaluate the condition of the PL and PB separately after LAS.

scholarly journals Estrogen treatment effects on rats soleus muscles' glycogen content, extracellular matrix and cross-sectional area

2017 ◽  
Vol 34 (04) ◽  
pp. 257-261
Author(s):  
M. Severi ◽  
J. Durigan ◽  
E. Pereira ◽  
L. Batista e Silva ◽  
W. Martins ◽  
...  
Keyword(s):  
Connective Tissue ◽  
Muscle Mass ◽  
Muscle Atrophy ◽  
Muscle Glycogen ◽  
Glycogen Content ◽  
Cross Sectional Area ◽  
Estrogen Treatment ◽  
Sectional Area ◽  
Cross Sectional ◽  
Tissue Density

Abstract Objective: To evaluate the effects of estrogen treatment of rats' soleus muscles after denervation on glucose metabolism, muscle mass, glycogen content, cross-sectional area and connective tissue density. Methods: Eighteen rats were divided into the following three groups of six animals: control, denervated for 7 days (denervated), and denervated with estradiol treatment for 7 days (denervated and treated). We measured glucose and insulin tolerance, muscle glycogen, mass, cross-sectional area and connective tissue content. Results: The denervated only and the denervated and treated groups displayed a significant reduction in glucose uptake (32% and 53% respectively compared with the control group; p<0.05). Soleus muscle denervation reduced muscle glycogen (0.25 ± 0.03 vs 0.43 ± 0.02 mg/100mg; p<0.05), muscle mass (0.33 ± 0.09 vs. 0.48 ± 0.06 mg/g; p<0.05) and cross-sectional area (1626 ± 352 vs. 2234 ± 349 μm2; p<0.05), and increased connective tissue content (35 ± 7 vs. 10 ± 5%; p<0.05) compared to controls. Estrogen treatment decreased connective tissue density in the denervated and treated group (24 ± 4%; p<0.05) compared to the denervated group. It also prevented alterations on muscle glycogen in denervated and trated group. However, estrogen treatment did not prevent muscle atrophy (1626 ± 352 vs. 1712 ± 319 μm2). Conclusion: Estrogen treatment of rats' soleus muscles after denervation increased muscle glycogen content and minimized connective tissue density increase, but it did not prevent muscle atrophy.

scholarly journals Quantitative assessment of the entire thoracic aorta from magnetic resonance images

2010 ◽  
Vol 21 (2) ◽  
pp. 170-177 ◽  
Author(s):  
Ryan K. Johnson ◽  
Senthil Premraj ◽  
Sonali S. Patel ◽  
Andreas Wahle ◽  
Alan Stolpen ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Connective Tissue ◽  
Thoracic Aorta ◽  
Aortic Root ◽  
Magnetic Resonance Images ◽  
Cross Sectional Area ◽  
Sectional Area ◽  
Healthy Individuals ◽  
Cross Sectional ◽  
The Cross

AbstractObjectivesAlthough magnetic resonance imaging is a primary modality for following patients with connective tissue diseases, only a limited amount of the image data is utilised. The purpose of this study was to show the clinical applicability of an automated four-dimensional analysis method of magnetic resonance images of the aorta and develop normative data for the cross-sectional area of the entire thoracic aorta.Study designMagnetic resonance imaging was obtained serially over 3 years from 32 healthy individuals and 24 patients with aortopathy and a personal or family history of connective tissue disorder. Graph theory-based segmentation was used to determine the cross-sectional area for the thoracic aorta. Healthy individual data were used to construct a nomogram representing the maximum cross-sectional area 5th–95th percentile along the entire thoracic aorta. Aortic root diameters calculated from the cross-sectional area were compared to measured diameters from echocardiographic data. The cross-sectional area of the entire thoracic aorta in patients was compared to healthy individuals.ResultsCalculated aortic root diameters correlated with measured diameters from echo data – correlation coefficient was 0.74–0.87. The cross-sectional area in patients was significantly greater in the aortic root, ascending aorta, and descending aorta compared to healthy individuals.ConclusionThe presentation of the dimensional data for the entire thoracic aorta shows an important clinical tool for following patients with connective tissue disorders and aortopathy.

Pelvic Canal Narrowing Caused by Triple Pelvic Osteotomy in the Dog

1994 ◽  
Vol 07 (03) ◽  
pp. 110-113 ◽  
Author(s):  
D. L. Holmberg ◽  
M. B. Hurtig ◽  
H. R. Sukhiani
Keyword(s):  
Postoperative Complications ◽  
Pelvic Osteotomy ◽  
Cross Sectional Area ◽  
Sectional Area ◽  
Cross Sectional ◽  
Canal Width ◽  
Operative Complications ◽  
Post Operative Complications

SummaryDuring a triple pelvic osteotomy, rotation of the free acetabular segment causes the pubic remnant on the acetabulum to rotate into the pelvic canal. The resulting narrowing may cause complications by impingement on the organs within the pelvic canal. Triple pelvic osteotomies were performed on ten cadaver pelves with pubic remnants equal to 0, 25, and 50% of the hemi-pubic length and angles of acetabular rotation of 20, 30, and 40 degrees. All combinations of pubic remnant lengths and angles of acetabular rotation caused a significant reduction in pelvic canal-width and cross-sectional area, when compared to the inact pelvis. Zero, 25, and 50% pubic remnants result in 15, 35, and 50% reductions in pelvic canal width respectively. Overrotation of the acetabulum should be avoided and the pubic remnant on the acetabular segment should be minimized to reduce postoperative complications due to pelvic canal narrowing.When performing triple pelvic osteotomies, the length of the pubic remnant on the acetabular segment and the angle of acetabular rotation both significantly narrow the pelvic canal. To reduce post-operative complications, due to narrowing of the pelvic canal, overrotation of the acetabulum should be avoided and the length of the pubic remnant should be minimized.

DETERMINATION OF THE FUNCTION OF THE ROD’S CROSS-SECTIONAL AREA USING VIBRATION EIGENFREQUENCIES

2020 ◽  
Vol 0 (4) ◽  
pp. 19-24
Author(s):  
I.M. UTYASHEV ◽  
◽  
A.A. AITBAEVA ◽  
A.A. YULMUKHAMETOV ◽  
◽  
...  
Keyword(s):  
Cross Sectional Area ◽  
Variable Cross ◽  
Sectional Area ◽  
Longitudinal Vibrations ◽  
Cross Sectional ◽  
Method Error ◽  
Various Boundary Conditions ◽  
Elastic Fixation ◽  
Crosssectional Area

The paper presents solutions to the direct and inverse problems on longitudinal vibrations of a rod with a variable cross-sectional area. The law of variation of the cross-sectional area is modeled as an exponential function of a polynomial of degree n . The method for reconstructing this function is based on representing the fundamental system of solutions of the direct problem in the form of a Maclaurin series in the variables x and λ. Examples of solutions for various section functions and various boundary conditions are given. It is shown that to recover n unknown coefficients of a polynomial, n eigenvalues are required, and the solution is dual. An unambiguous solution was obtained only for the case of elastic fixation at one of the rod’s ends. The numerical estimation of the method error was made using input data noise. It is shown that the error in finding the variable crosssectional area is less than 1% with the error in the eigenvalues of longitudinal vibrations not exceeding 0.0001.

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