Spelling suggestions: "subject:"deep muscles"" "subject:"keep muscles""
1 |
Baidarių ir kanojų irkluotojų liemens raumenų statinės jėgos ištvermės priklausomumas nuo sportininkų specializacijos, amžiaus ir meistriškumo / The dependency of static strength endurance of trunk muscles of canoe and kayak rowers on the specialisation, age and performance of the atheletesVasiliauskas, Vytautas 19 June 2014 (has links)
Darbo objektas: baidarių ir kanojų irkluotojų liemens raumenų statinė jėgos ištvermė.
Darbo tikslas: palyginti baidarių ir kanojų irkluotojų ir fiziškai aktyvių vyrų liemens raumenų statinę jėgos ištvermę.
Darbo uždaviniai:
1. Palyginti baidarių ir kanojų irkluotojų liemens raumenų statinę jėgos ištvermę priklausomai nuo sportininkų specializacijos.
2. Palyginti baidarių ir kanojų irkluotojų liemens raumenų statinę jėgos ištvermę priklausomai nuo sportininkų amžiaus.
3. Palyginti baidarių ir kanojų irkluotojų liemens raumenų statinę jėgos ištvermę priklausomai nuo sportininkų meistriškumo.
Hipotezė: Kanojininkų liemens raumenų statinės jėgos ištvermės rodikliai bus didesni nei baidarininkų bei kontrolinės grupės tiriamųjų.
Išvados:
1. Baidarių ir kanojų irkluotojų liemens raumenų statinės jėgos ištvermės rodikliai skiriasi nežymiai, tačiau yra ženkliai didesni nei kontrolinės grupės (išskyrus dauginio ir skersinio pilvo raumenis).
2. Nepriklausomai nuo amžiaus (jauniai: vid. 17 metų, jaunimas: vid., 21 metai), liemens raumenų statinė jėgos ištvermė buvo didesnė nei kontrolinės grupės tiriamųjų (vid., 22 m., išskyrus kairės pusės liemens bei dauginio ir skersinio pilvo raumenis).
3. Aukšto meistriškumo sportininkų liemens raumenų statinė jėgos ištvermė buvo didesnė nei žemo meistriškumo irkluotojų. Tuo tarpu žemo meistriškumo sportininkų rezultatai buvo didesni nei kontrolinės grupės (išskyrus skersinio pilvo raumens ištvermės gulint ant nugaros bei dauginio ir skersinio... [toliau žr. visą tekstą] / The object of thesis: static strength endurance of trunk muscles of canoe and kayak rowers
The aim: to compare the static strength endurance of trunk muscles of canoe and kayak rowers and control group men.
The goals:
1. To compare static strength endurance of trunk muscles of canoe and kayak rowers depending on specialisation of the athletes
2. To compare static strength endurance of trunk muscles of canoe and kayak rowers in relation to the age of the athletes
3. To compare static strength endurance of trunk muscles of canoe and kayak rowers in relation to the performance of the athletes .
Hypothesis: The indicators of the static strength endurance of trunk muscles of canoe rowers will be higher than kayakers and testing group.
Conclusions:
1. The indicators of static strength endurance of trunk muscles of canoe and kayak rowers in regard to the specialisation of athletes do not differ significantly, yet they are significantly higher than those of the control group (except for multiple and transverse abdominal muscle endurance test).
2. Despite the age of the rowers (juniors: 17 years of age, the youth: 21-year-olds), the static strength endurance of trunk muscles was higher than that of the control group (22 years old) (except for the left side trunk muscles endurance and multiple and transverse abdominal muscle endurance test).
3. Static strength endurance of trunk muscles of high-performance athletes was higher than that of the rowers with lower performance... [to full text]
|
2 |
Human muscle spindles : complex morphology and structural organisationLiu, Jing-Xia January 2004 (has links)
Muscle spindles are skeletal muscle mechanoreceptors that mediate the stretch reflex and provide axial and limb position information to the central nervous system. They have been proposed to play a major role in the pathophysiology of muscle pain. Knowledge about the normal human muscle spindles is needed in order to understand their role in muscle disease or dysfunction. The aim of this study was to investigate the fiber content and MyHC composition of the muscle spindles in the human biceps brachii (BB) and deep muscles of the neck (DN); to determine whether there are age-related changes in human muscle spindles with respect to structure and MyHC composition; to investigate the distribution of SERCA isoforms and to evaluate whether there is a coordinated expression of SERCA and MyHC isoforms in intrafusal fibers. The myosin heavy chain (MyHC) content correlates to contraction velocity and force and the sarcoplasmic reticulum Ca2+ ATPase (SERCA) is a major determinant of muscle fiber relaxation velocity. Muscle specimens obtained from young and old subjects were serially sectioned and the pattern of distribution of different proteins along the length of the intrafusal fibers was revealed by immunocytochemistry. The MyHC content of single muscle spindles was assessed with SDS-PAGE and immunoblots. There were clear differences between BB and DN with regard to the morphology and MyHC composition of muscle spindles. Virtually each muscle spindle in the BB, but not in the DN, had a unique allotment of numbers of bag1, bag2 and chain fibers. In DN, a number of muscle spindles lacked either bag1 or bag2 fibers. Four major MyHC isoforms (MyHCI, IIa, α-cardiac and intrafusal) were detected by SDS-PAGE. In both BB and DN, immunocytochemistry revealed co-expression of several MyHC isoforms in each intrafusal fiber and regional heterogeneity. Both nuclear bag1 and bag2 fibers contained slow tonic MyHC uniformly and MyHCI, α-cardiac, embryonic and fetal with regional variations. Nuclear chain fibers contained MyHCIIa, embryonic and fetal and in the BB also MyHCIIx. The total number of intrafusal fibers per spindle decreased significantly with aging, due to a significant reduction in the number of nuclear chain fibers. The patterns of MyHC expression were also affected by aging. The bag1 fibers predominantly contained both SERCA isoforms in the encapsulated region. The bag2 fibers were more heterogeneous in their SERCA composition and 16-27% of them lacked both isoforms. Chain fibers contained SERCA1. There was a poor correlation between the MyHC and SERCA isoforms in nuclear bag fibers, whereas a strong correlation existed between MyHCIIa and SERCA1 in the nuclear chain fibers. Human muscle spindles, each being unique, proved to be more complex than anticipated. The clear differences shown between the BB and DN muscle spindles suggest functional specialization in the control of movement among different human muscles. Aging apparently had profound effects on intrafusal fiber content and MyHC composition. The age-related changes in muscle spindle phenotype may reflect deterioration in sensory and motor innervation and are likely to have a detrimental impact on motor control in the elderly.
|
Page generated in 0.0291 seconds