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Uncontrolled and over-intensive training can lead to a decrease in exercise efficiency and health state disorders in dogs. Examinations of sled dogs revealed that prolonged effort induced specific biochemical changes and released indicatory enzymes into peripheral circulation. The purpose of the study was to reveal the efficacy of selected markers of aspartate aminotransferase (AST), creatine kinase (CK), lactate dehydrogenate (LDH) and their isoenzymes, C-reactive protein (CRP), glucose and lactic acid in detecting sub clinical states of skeletal muscles lesions. Examinations were carried out on 17 sled dogs (Siberian Husky, Alaskan Malamut) at the start, during and end of the training season, before and after exercise. Dogs were in good condition before study and did not revealed clinical symptoms of disease. During progressively extended training loads a decrease in the motor activity of some dogs was noted. An increase in the activity of AST, CK and LDH5 in the examined dogs confirmed these changes and testified to skeletal muscle injury. The lack of adaptation of organism efficiency to excessive trainings loads also caused an increase in the concentration of glucose and lactic acid in the plasma of the sled dogs. C-reactive protein and inflammatory state markers were also designated to estimate of health state of the dogs. An increase of CRP concentration, noted in the examined dogs, could testified to inflammatory states of muscles or may have be connected with exercise stress. Clinical symptoms confirmed these changes. A lack of physical adaptation to the intensity of training leads to muscle injuries. Measurements of muscle injury markers during excessive load training facilitate the recognition of hyper-training states and muscles injuries in sled dogs.
The aim of the study was to evaluate whether any differences can occur in the reactions of selected horse blood parameters to training in relation to the length of show jumping horse training and horse achievements. The research material consisted of blood and serum collected from 20 horses (aged 4-11 years). The animals were divided into 4 groups of 5 horses each depending on their number of years in show jumping training, their achievements in show jumping contests, and their sport potential. The following parameters were examined in the blood and serum: hematocrit, hemoglobin concentration, red and white blood cells count, granulocytes, platelets, fibrinogen, total plasma proteins, lactate, and creatine kinase activity. Blood samples were collected four times from each horse: before show jumping training, 5 and 30 minutes after training, and 24 hours after training. The training was followed by an increase of monitored hematological indicators, which was a physiology reaction to physical effort; no abnormalities were noticed. Horses with outstanding sport potential from both age groups were characterized by higher initial values of parameters associated with erythrocyte system, i.e., Hb, Ht. At the same time, changes caused by physical effort (an increase of Ht, Hb, and RBC) proceeded more steadily in the case of horses with outstanding sport potential than others. Physical effort caused a short-term increase of granulocytes and platelets. The marked initial concentration of lactate acid was higher than stated in the literature, and in individual cases reached concentrations of 1.1 to 2.2 mmol/l. Creatine kinase increased in activity following the training process but did not increase any further, which indicated that there were no significant injuries in the muscular system. Despite the existing tendencies, the differences between horses with outstanding sport potential and average animals were not statistically significant and therefore did not facilitate predicting the sport potential of horses, but they may be useful in evaluating the appropriateness of the training process.
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