Abstract: In order to reduce the medical damage in case of accident in the aquatic
environment, it is important to have a good assessment of the changes occurring in the human
body and especially those in the body of the person providing assistance in case of a water of
sea accident. During the period from 21.07.20 to 22.02.21 in Varna, Bulgaria in a training
water pool were measured heart rate of those preparing for lifeguards. Modern waterproof
measuring bracelets were used. During the training, several different types of loads are
included, which are as close as possible to the challenges of a real rescue operation, without
putting the lives of the subjects at risk. By analysing the received information, it is established
that the best prepared subject was a 34-year-old man with the smallest deviation from the
normal values of the heart rate. The other four participants were 17-years-old students and
they all had similar performance. The most significant differences between the first volunteer
and the other four lie in the prior marine training, greater life experience and higher
confidence of the first candidate. Another indicative finding is the establishment of better and
better results in the subjects with the progress of training. An expression of this is the
comparison between results from the first training of the water rescue course on one hand,
and on the other hand results from the exam held on 04.03.21.
Keywords: aquatic environment, measuring bracelets, pulse 

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