muscle groups
Recently Published Documents


TOTAL DOCUMENTS

1081
(FIVE YEARS 344)

H-INDEX

59
(FIVE YEARS 6)

Author(s):  
Fadi Al Khatib ◽  
Afif Gouissem ◽  
Raouf Mbarki ◽  
Malek Adouni

Knee osteoarthritis (OA) is a growing source of pain and disability. Obesity is the most important avoidable risk factor underlying knee OA. The processes by which obesity impacts osteoarthritis are of tremendous interest to osteoarthritis researchers and physicians, where the joint mechanical load is one of the pathways generally thought to cause or intensify the disease process. In the current work, we developed a hybrid framework that simultaneously incorporates a detailed finite element model of the knee joint within a musculoskeletal model to compute lower extremity muscle forces and knee joint stresses in normal-weight (N) and obese (OB) subjects during the stance phase gait. This model accounts for the synergy between the active musculature and passive structures. In comparing OB subjects and normal ones, forces significantly increased in all muscle groups at most instances of stance. Mainly, much higher activation was computed with lateral hamstrings and medial gastrocnemius. Cartilage contact average pressure was mostly supported by the medial plateau and increased by 22%, with a larger portion of the load transmitted via menisci. This medial compartment experienced larger relative movement and cartilage stresses in the normal subjects and continued to do so with a higher level in the obese subjects. Finally, the developed bioengineering frame and the examined parameters during this investigation might be useful clinically in evaluating the initiation and propagation of knee OA.


Vaccines ◽  
2022 ◽  
Vol 10 (1) ◽  
pp. 117
Author(s):  
Grgur Salai ◽  
Ervina Bilic ◽  
Dragan Primorac ◽  
Darija Mahovic Lakusic ◽  
Hrvoje Bilic ◽  
...  

The BNT162b2 (Pfizer BioNTech) mRNA vaccine is an effective vaccine against COVID-19 infection. Here, we report an adverse event following immunization (AEFI) in a 48-year-old female patient who presented with fasciculations, migraine auras without headaches and in an increased discomfort of previously present palpitations, as well as excitation and insomnia. Her fasciculations were intermittently present until the time this paper was written, starting from the 6th day post-vaccination; they changed localization and frequency, but most commonly they were generalized, affecting almost all muscle groups. The patient also suffered from two incidents of migraine auras with visual kaleidoscope-like phenomena without headaches a few months after the vaccination. These symptoms were considered to be AEFI and no causal relation with the vaccine could be proven.


Author(s):  
Katarzyna Kaczmarek ◽  
Juliusz Huber ◽  
Katarzyna Leszczyńska ◽  
Przemysław Daroszewski

The available data from electroneurography (ENG) studies on the transmission of neural impulses in the motor fibers of upper and lower extremity nerves following neuromuscular functional electrical stimulation (NMFES) combined with kinesiotherapy in post-stroke patients during sixty-day observation do not provide convincing results. This study aims to compare the effectiveness of an NMFES of antagonistic muscle groups at the wrist and ankle and kinesiotherapy based mainly on proprioceptive neuromuscular facilitation (PNF). An ENG was performed once in a group of 60 healthy volunteers and three times in 120 patients after stroke (T0, up to 7 days after the incident; T1, after 21 days of treatment; and T2, after 60 days of treatment); 60 subjects received personalized NMFES and PNF treatment (NMFES+K), while the other 60 received only PNF (K). An ENG studied peripheral (M-wave recordings), C8 and L5 ventral root (F-wave recordings) neural impulse transmission in the peroneal and the ulnar nerves on the hemiparetic side. Both groups statistically differed in their amplitudes of M-wave recording parameters after peroneal nerve stimulation performed at T0 and T2 compared with the control group. After 60 days of treatment, only the patients from the NMFES+K group showed significant improvement in M-wave recordings. The application of the proposed NMFES electrostimulation algorithm combined with PNF improved the peripheral neural transmission in peroneal but not ulnar motor nerve fibers in patients after ischemic stroke. Combined kinesiotherapy and safe, personalized, controlled electrotherapy after stroke give better results than kinesiotherapy alone.


2022 ◽  
Vol 53 (5) ◽  
Author(s):  
Milivoje Urošević ◽  
Darko Drobnjak ◽  
Radomir Mandić ◽  
Ružica Trailović ◽  
Goran Stanišić ◽  
...  

The domestic donkey (Equus asinus) has a very specific body construction. It is built in such a way that the mutual relationship of individual body regions enables great work endurance. The fact that this breed of domestic animal originates from wild ancestors, originated and developed in Africa, clearly shows that the breed developed in harsh climatic and ecological conditions that conditioned the appropriate biological response. The biostatic model causes the biodynamic effect, i.e., the production of biokinetic energy. Movement forwards occurs as a consequence of the creation of biokinetic energy and its transfer from the back part of the body, where it originates, to the front part of the body. The most efficient transfer of biokinetic energy is enabled by the existence of an appropriate biostatic model, i.e., body structure, and this leads to a biodynamic effect that is defined as a movement. For the process of movement, the muscles must be well developed. Two muscle groups are distinguished; a) pelvic muscles, b) external hip and croup joint muscles. The basic lever for the transfer of biokinetic energy is the femur. The generated energy is transferred from the hip joint to the thigh muscles, which shortening leads to the movement of the hind leg forward, its leaning against the ground and pushing the whole body forward. The generated biokinetic energy cause the bio kinematic effect, which is characterized as a movement.


2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Willig Gabriel

Introduction: Monopodal jumping is a common gesture in daily life and sports. In the Landing Phase (LF), potential energy is absorbed from the tridimensional stability of the Lower Limb (LH). This stability depends on neuromuscular strategies that include factors such as Muscle Preactivation Times (MAT) and the Sequence of Participation (SP) of the muscle groups. The alteration of TPA has been pointed out as a factor of possible injury. The aim of this study was to determine the preactivation times and participation sequence of the gluteus medius, adductor magnus, rectus femoris, vastus medialis quadriceps, biceps femoris longus, semimembranosus and soleus muscles during the monopodal jump landing in university students. At the same time, we sought to determine the existence or not of significant differences between men and women. Materials and methods: Twenty-six young adults, 16 women and 10 men, participated. An inertial sensor and 7 surface electrodes were used to collect electromyographic data in the gluteus medius, rectus femoris and vastus medialis quadriceps, semimembranosus, biceps femoris long head, soleus and adductor magnus muscles. Results: The general activation sequence was Vastus medialis -Biceps femoris longus - Adductor magnus - Gluteus medius - Rectus femoris -Semimembranosus and soleus. The data obtained reflects the activation prior to ground contact of all the muscles studied. There were differences between genders. Women presented a previous activation in all muscles with the exception of the gluteus medius. The muscles with the greatest variability were the adductor magnus in men and the rectus femoris in women. Conclusion: The significant differences found between men and women show that there are trends that can be the beginning to better understand the risk factors for injury generation. The TPA data presented a great variability which could reflect the existence of different activation patterns and not a unique behavior of the MMII musculature.


2021 ◽  
Vol 7 (4) ◽  
pp. 121-124
Author(s):  
Monika Michalíková ◽  
Lucia Bednarčíková ◽  
Bibiána Ondrejová ◽  
Miroslava Barcalová ◽  
Jozef Živčák

Nowadays, the pathophysiological posture is a problem for a large part of the population, which leads to a deterioration in the quality of life as a result of functional disorders of the human musculoskeletal system. The aim of the presented article is to point out the effectiveness of movement therapy for the correction of the pelvic position and subsequent adjustment of the body posture, which is evaluated by a change in the distribution of plantar pressures as well as the position of the center of gravity projection. Observations were made on three subjects who reported pain in different areas of the body as a result of incorrect body posture. Input and control measurements were performed on a baropodometer, and Neurac movement therapy in the Redcord system was applied between the individual measurements. The individual exercises were chosen specifically with regard to affect the specific muscle groups. After evaluating the measured data, it can be stated that the selected movement therapy has a significant effect on the correction of pathophysiological position, which is also demonstrated by changing the distribution of plantar pressures, adjusting the position of the center of gravity projection and also significantly eliminating painful symptoms and increasing movement comfort.


2021 ◽  
pp. 86-92
Author(s):  
S. V. Vasilevich ◽  
P. L. Zaltcman

Introduction. Cramps are sudden, involuntary, painful tonic muscle spasms of individual muscles or muscle groups lasting from several seconds to several minutes. It occurs in patients of different age categories with a frequency of up to 37 %. Tissue flossing (flossing, voodoo flossing) is an effect on the musculature, tendons, fascia (myofascial structures) of the extremities with the help of a special elastic band circularly wound on the limb, and subsequent physical exercises in this condition in order to improve blood circulation in the limb segment, increase tissue mobility, elasticity and extensibility of muscle-fascial structures. Tissue flossing can help to increase the volume of movements in the joints, reduce pain and increase flexibility.The aim to study the effects of tissue flossing on the frequency and intensity of manifestations of cramps. Materials and methods. The publication was based on the materials obtained during the observation of 7 patients with cramps. The aggressive nature of the muscle spasms forced them to seek medical help. In order to assess the effect on the frequency and intensity of cramps, patients underwent circular winding of an elastic band on a limb segment (tissue flossing) in which cramps occurred, followed by physical exercises (mainly flexion and extension at a pace of one movement per second) without additional load (with their weight) for 1 minute. Then the elastic band was removed and the patient continued to perform the same movements also for a minute with a frequency of one movement per second. Patients performed exercises 1-2 times a day for 5-14 days.Results. In five out of seven patients, cramps did not resume after the first use of tissue flossing. In two of the seven patients, cramps stopped after 7 days of exercise use. At follow-up in one (out of seven) patients, cramps resumed 2 months after the use of tissue flossing, but with a lower intensity. In the other six (out of seven) patients in the subsequent follow-up period (from 14 days to 6 months), cramps did not resume.Conclusion. According to the preliminary results of observations, it can be assumed that the tissue flossing method is effective for preventing cramps of various genesis as an independent and additional method of treatment.


2021 ◽  
Vol 27 (4) ◽  
pp. 145-154
Author(s):  
Zhanna Yu. Pilipson ◽  
Dmitrii O. Ilʼin ◽  
Aleksei N. Logvinov ◽  
Aleksandr V. Frolov ◽  
Ivan A. Vasiliev ◽  
...  

Scapular dyskinesis is any alteration of its static position or kinematics during movements in the shoulder joint. The correct scapula orientation is associated with the tone of the muscles attached to it. The prevalence of scapular dyskinesis is high among patients with subacromial impingement syndrome, partial rotator cuff tears, shoulder joint instability and SLAP injuries. Scapular dyskinesis can be caused by a whole range of factors, including upper cross syndrome and postural adaptations predisposing to it, neurological disorders. However, instrumental diagnosis of scapular dyskinesis is difficult, which makes the use of clinical tests the main method of its detection. In this lecture, the etiology of scapular dyskinesis, classification, diagnostic tests and treatment methods are analyzed in detail. The detection of scapular dyskinesis and its type determination in patients with shoulder joint pathologies allows us to form an optimal rehabilitation therapy protocol, including techniques of myofascial release, passive and active stretching of spasmodic and training of weak muscle groups aimed at correcting postural disorders, pathology of the scapulohumeral rhythm, restoration of the glenohumeral joint normal biomechanics.


2021 ◽  
Vol 6 (6) ◽  
pp. 331-336
Author(s):  
O. S. Slavityak ◽  
◽  
N. V. Kovaleva ◽  
O. Yu. Bychkov ◽  
A. O. Tvelina ◽  
...  

The purpose of the study was the analysis of the growth dynamics of power indicators of athletes-bodybuilders at the stage of specialized basic training. Materials and methods. The study was conducted from March to the end of June (4 months) 2021. It involved 60 athletes aged from 18 to 19 years. Three research groups were formed, 20 athletes in each. These groups of athletes were divided by the usual sample method and by age. Qualification and anthropometric characteristics did not differ significantly. The only difference was in the proposed training programs. Theoretical analysis of scientific and methodological literature was carried out. Test control method for determining the maximum muscle strength of athletes to assess the initial level of muscle strength development in the surveyed contingent and determine the characteristics of its dynamics, was used. The obtained data were used to calculate the indicators of the value of the training load of athletes. In addition, method for quantitative assessment of athletes' physical load was used. The mathematical processing of research results was carried out using the software packages IBM SPSS Statistics 20. Results and discussion. The research results indicate that the values of the training loads indicators of bodybuilders and the nature of their changes in conditions of the same level of athletes' fitness and the structure of the training session depend on the characteristics of the selected training means (training programs). The analysis of the results obtained shows that under the conditions of the second variant of the training program, the indicators of the working mass of the athletes' equipment change more significantly during the entire research period. A similar tendency is observed when monitoring the load volume indicators, despite the fact that the most significant increase in this indicator among bodybuilders when performing formative exercises was obtained under the conditions of using the third variant of the training program, using the “premature fatigue” method. Conclusion. The growth rates of the strength capabilities of the main muscle groups turned out to be the highest among bodybuilders of the second main group due to the long-term use of the “premature fatigue” method. When performing exercises of a formative nature, the growth rate of strength capabilities was 30.9% (p <0.05), while when performing exercises of a basic nature, such an increase was three times less (by 10.5%, p <0.05)


Sensors ◽  
2021 ◽  
Vol 22 (1) ◽  
pp. 97
Author(s):  
Andrey Briko ◽  
Vladislava Kapravchuk ◽  
Alexander Kobelev ◽  
Alexey Tikhomirov ◽  
Ahmad Hammoud ◽  
...  

The electrical impedance myography method is widely used in solving bionic control problems and consists of assessing the change in the electrical impedance magnitude during muscle contraction in real time. However, the choice of electrode systems sizes is not always properly considered when using the electrical impedance myography method in the existing approaches, which is important in terms of electrical impedance signal expressiveness and reproducibility. The article is devoted to the determination of acceptable sizes for the electrode systems for electrical impedance myography using the Pareto optimality assessment method and the electrical impedance signals formation model of the forearm area, taking into account the change in the electrophysical and geometric parameters of the skin and fat layer and muscle groups when performing actions with a hand. Numerical finite element simulation using anthropometric models of the forearm obtained by volunteers’ MRI 3D reconstructions was performed to determine a sufficient degree of the forearm anatomical features detailing in terms of the measured electrical impedance. For the mathematical description of electrical impedance relationships, a forearm two-layer model, represented by the skin-fat layer and muscles, was reasonably chosen, which adequately describes the change in electrical impedance when performing hand actions. Using this model, for the first time, an approach that can be used to determine the acceptable sizes of electrode systems for different parts of the body individually was proposed.


Sign in / Sign up

Export Citation Format

Share Document