In low-dimensional systems dynamical nuclear polarization is a sensitive tool for the study of electron-nuclear interaction. We report on Overhauser-shift experiments on the PDEG of AI,Ga,.,As/GaAs heterostructures. The conduction electron spin resonance has been electrically detected via the associated change of the magnetoresistance R,,, and dynamical nuclear polarization (the Overhauser elfect) has been achieved by saturating the conduction electron spin resonance (CESR). In order to investigate the nuclear spin relaxation the samples were embedded in an RF coil and the temporal decay of the Overhauser shift was followed with and without additional NMR irradiation. Different spin-lanice relaxation times of '*Ga, "Ga and "As could be detected and small deviations from a pure Korringa behaviour have been found.
Monitoring of biochemical parameters of blood allows to determine the individual characteristics of athletes’ body and evaluate the effectiveness of building a training process. The increasing volume of physical activity during the preparatory period forces us to search for means of rapid increase in the functional level state and physiological reserves of an organism. In this regard, as one of the methods, the physiotherapeutic course effect of low-intensity laser radiation can be used. It was revealed that a specific physical load leads to a significant increase in lactate and total blood protein levels. So, in short-trackers in a state of relative physiological rest, the concentration of lactate was 2,77±0,24 mmol/l, which is much higher than the norm (the norm is 1,3±0,35 mmol/l). After the course of low-intensity laser radiation, the lactate level decreased insignificantly (2,52±0,19 mmol/l), but did not reach normal values. After the action on the body of a specific physical load, lactate concentration increased significantly, reaching a level equal to 9,24±0,43 mmol/l. The conducted course laser therapy allowed to reliably (р 0,05) lower its level to 6,25±0,32 mmol/l. In this case, urea and creatinine had only a tendency to increase. Thus, low-intensity laser radiation against the background of a specific physical load makes it possible to bring the investigated parameters close to the boundary of the physiological norm.
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