[Muscular bioelectric activity, synchronous with respiration, following physical loading in trained and untrained...

The authors aimed to examine the occurrence of biopotentials of muscles of the extremities, synchronous with respiration, and their duration after dynamic functional loadings with various length of time and intensity in trained and nontrained individuals. They carried out 60 examinations on two groups of students from the Higher Physical Institute: trained and nontrained. The following indices were recorded: muscle bioelectric activity of m. biceps brachii dex., m. quadriceps femoris dex., m . gastrocne-mius dex. and respiration before and after three types of functional loading of veloergometerfirst (2 X 30 sec. with 20 seconds of rest between them after 100 rotations/minute and 245 watts of strength) and second (5 X 1 minute with 30 seconds of rest after each minute after 90 rotations and 200 watts) were of speed character, but the third (20 minutes after 60 rotations per minute and 117 watts withminute of rest after each 5 minutes of work), developing the trait of endurance. On the basis of the obtained results the authors found that muscle bioelectrical activity, synchronous with vespiration, waw observed in the largest percentage of the examined persons after loading with speed character and in smaller percentage-after exercises for endurance, in which its duration was less as well. This precentage on its side was greater in nontrained persons in comparison with trained persons, in whom the phenomenon disappeared more quickly.