Amateur diving is becoming a more and more popular form of recreation for people of all ages (often even those over fifty years old) in Poland. The aim of this preliminary study was to determine whether practising amateur diving affects the subjects and, if so, how it influences the basic parameters of the respiratory system.The study was conducted during an 11-day cruise on the Mediterranean Sea combined with diving cycles. An experimental group consisted of 14 subjects from 21 to 50 years old. In total there were 124 individual dives made in a depth range from 12 to 43 meters. Each time before entering the water and immediately after the dive a PEF test was performed. The results were recorded in the daily dives card. All the results are summarized in the table and statistical analysis has been made.As a result of the study, depending on the depth a statistically significant negative correlation found between the age of the divers and the value of PEF after diving could be seen, as well as a statistically significant negative correlation between the age of the diver and the value of PEF and the time the dive was carried out.
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