Comparative study on evaluation algorithms for neck muscle fatigue based on surface electromyography signal / 生物医学工程学杂志

The purpose of this study is to compare the differences among neck muscle fatigue evaluation algorithms and to find a more effective algorithm which can provide a human factor quantitative evaluation method for neck muscle fatigue during bending over the desk. We collected surface electromyography signal of sternocleidomastoid muscle of 15 subjects using wireless physiotherapy Bio-Radio when they bent over the desk using memory pillows for 12 minutes. Five algorithms including mean power frequency, spectral moments ratio, discrete wavelet transform, fuzzy approximation entropy and the complexity algorithms were used to calculate the corresponding muscle fatigue index. The least squares method was used to calculate the corresponding coefficient of determination and slope of the linear regression of the muscle fatigue metric. The coefficient of determination evaluates anti-interference ability of algorithms. The maximum vertical distance which is obtained by the Kolmogorov-Smirnov test for the slopes evaluates the ability to distinguish fatigue of algorithms. The results indicate that in the aspect of anti-interference ability, the fuzzy approximation entropy has the largest when using memory pillows with different heights. When the fuzzy approximate entropy is compared with average power frequency or the discrete wavelet transform, the differences are significant ( < 0.05). In terms of distinguishing the degree of fatigue, the approximate entropy is still the largest, with a maximum of 0.496 7. Fuzzy approximation entropy is superior to other algorithms in ability of anti-interference and distinguishing fatigue. Therefore, fuzzy approximation entropy can be used as a better evaluation algorithm in the evaluation of cervical muscle fatigue.

A Case of Primary Ewing Sarcoma of the Strap Muscle / 대한이비인후과학회지

Ewing sarcoma (ES) is an uncommon type of malignancy that arises most frequently in the long bones of the extremities and the pelvis. Primary ES of the head and neck region is extremely rare, accounting for only 1-9% of all ES cases. Because ES typically affects children and young adults, it is of paramount importance to differentiate such tumors from benign lesions or congenital neck masses, particularly in cases where lesions arise primarily from the soft tissue rather than from the bone. We encountered a case of ES of the strap muscle in a 4-year-old boy that manifested as an isolated midline neck mass mimicking a thyroglossal duct anomaly. We report this case along with a brief literature review.

A rare case of unilateral third head of sternocleidomastoid muscle / Un caso raro de una tercera cabeza unilateral del músculo esternocleidomastoideo

A rare case of unilateral third head of sternocleidomastoid muscle was noted during routine dissections for undergraduate medical students. The additional third head originated from the middle third of the clavicle and joined the normal two heads (sternal and clavicular) of the muscle in the middle of the neck. The insertion and nerve supply of the muscle was normal. This case may be important for head and neck surgeons and for plastic surgeons doing muscle graft surgeries.

Un caso raro de una tercera cabeza unilateral del músculo esternocleido-mastoideo se observó durante disecciones de rutina para los estudiantes de medicina de pregrado. La tercera cabeza adicional se originó en el tercio medio de la clavícula y se unió a las dos cabezas normales (esternal y clavicular) del músculo en el medio del cuello. La inserción y e inervación del músculo fue normal. Este caso puede ser importante para los cirujanos de cabeza y cuello y para cirujanos plásticos que realizan cirugías de injerto muscular.

Management of tension-type headache with pressure pain point and painful tubercle in occiput-neck part / 中国康复理论与实践

@#Objective To observe the management effect of pressure pain point and painful tubercle in occiput-neck part on tension-type headache (TTH). Methods 380 TTH patients were treated by palpating the central and both sides part from the external occipital protuberance to the spinous processes of neck; recording the total number and position of pressure pain points and painful tubercles; kneading, hitting and pressing all recorded pressure pain points and painful tubercles.Results After 1-6 times treatment, 283 were cured and 58 were effected. The efficiency ratio is 89.7%. Conclusion Muscle obstacle in occiput-neck part plays an important role in TTH. Massage therapy has a significant effect on pressure pain points and painful tubercle.

A study of neck muscle strength in college american football players-Based on performance level, year and experience- / 体力科学

A study was conducted to evaluate and compare neck muscle strength between two levels of college American football players with the aim of preventing neck injuries. The subjects were American football players at N University (n=52) belonging to the first level league and American football players at G University (n=14) belonging to the third level league. The findings were as follows.<BR>1. The neck muscle strength of freshman players at N University tended to be lower than that of senior players.<BR>2. It was shown that the neck muscle strength/body weight of experienced American football players was 10-30% higher than that of inexperienced players.<BR>3. There was a significant difference in neck muscle strength/body weight between N University and G University in 1997. However, there was no significant difference between them in 1998, because neck muscle strength/body weight of G University players increased by 13-30% after neck muscle training for about nine months. It was suggested that coaching staff must evaluate the neck muscle strength of each player, especially in freshmen who have had no experience of American football, in order to prevent neck injuries because mismatch of performance level may cause catastrophic neck injury.