Raumenų nuovargis ir atsigavimas po maksimalaus intensyvumo veloergometrinio krūvio
| Author |
|---|
Dudonienė, Vilma |
Tamulevičius, Nerijus |
| Date | Issue | Start Page | End Page |
|---|---|---|---|
2001 | 3 | 29 | 33 |
Tiriamieji: suaugę (18-30 metai) aktyviai nesportuojantys vyrai (n=9). Po trijųserijų (vienos serijos trukmė 30 s) maksimalaus intensyvumo veloergometrinio krūvio pasireiškė mažų ir didelių stimuliavimo dažnių nuovargis, kuris nepriklausė nuo raumens ilgio ir nepakito, praėjus vienai valandai po krūvio. Keturgalvio šlaunies raumens susitraukimo jėgos atsigavimo greitoji fazė, priklausanti nuo metabolitų koncentracijos irpotenciacijos, nepasireiškė per pirmąsias atsigavimo minutes. Mažų ir didelių stimuliavimo dažnių raumenų nuovargis išnyko, praėjus 24 valandoms po maksimalaus intensyvumo veloergometrinio krūvio. Be to, tiriamieji nejautė raumenų skausmo.
The purpose of this study was to establish the influence of high-intensity exercise on quadriceps femoris muscle force, relaxation time and muscle recovery. Healthy untrained men (age 18-30 years, n=9) gave their informed consent to take part in all experiments within the study. They sat upright in the experimental chair with a vertical back support provided. A high voltage stimulator (MG 440, Medicor, Hungary) was used for electrical stimulation; quadriceps muscle was stimulated through surface electrodes (9x18 cm) padded with cotton cloth and soaked in saline solution. The following data were measured: the force of quadriceps muscle, aroused by electrical stimulation under 1 Hz (Pt), 20 Hz (P20) and 50 Hz (P50) frequencies (the duration of each electrical stimulation series was 1 s) and maximal voluntary contraction force (MVCF) depending on muscle length. Immediately after performing high-intensity exercise (Wingate test) there was statistically significant (P< 0.05) decrease in maximal voluntary contraction force and in force at low stimulation frequencies (1, 10 and 20 Hz) as compared to that of 50 Hz; there was statistically significant (P<0.05) increase in blood lactate after exercise. Muscle fatigue of low and high stimulation frequencies has been established after performing three bouts of high-intensity exercise and it does not depend on muscle length and does not disappear one hour after the exercise. Fast phase of muscle recovery depending on the concentration of metabolites and potentiation was not observed during the firs minutes of muscle recovery after high-intensity exercise. Low and high frequency fatigue disappeared after 24 hours after performing high-intensity exercise. Besides the subjects did not feel any muscle pain.
Sporto didaktika = Sport didactics
Sportininkų rengimas = Athletes' training