The cardiovascular system represents one of the fundamental and most important systems or structures within the human body. Its proper functioning is a key factor in determining an individual's overall physical condition. By studying cardiovascular function, which focuses on the performance of this structure, we can gain a more detailed insight into an individual's physical fitness. Using specific data and values obtained through various measurements, we can accurately define the current level of an individual's physical fitness and also plan potential exercise loads. The purpose of this study was to evaluate the validity of a test designed to monitor cardiovascular function (IFT 30 – 15) for individuals with varying levels of physical fitness. Methods: the study included 24 men and women participants who were divided into two groups based on their blood pressure levels and sex. They underwent measurements of physical characteristics, cardiovascular function and two graded exercise tests (a treadmill test – CPET and the IFT 30-15 test). In the treadmill test, the initial speed was set at 3 km/h, increasing by 0.5 km/h every minute. The IFT 30-15 test is a standardized interval test adapted for the participating population. The initial speed was 3 km/h and increased by 0.5 km/h at each subsequent stage. Both the treadmill test and the IFT 30-15 test were performed to exhaustion. During the treadmill test, direct respiratory gas exchange and heart rate were monitored. In the second test we monitored heart rate and final speed. Results: the IFT 30-15 test proved to be reliable and valid for monitoring selected variables. We also observed the occurrence of statistically significant differences between the groups in the test results. Based on the data, we can also conclude that there is a correlation between the test result and the specific condition of individuals within the sample and that this test is considerably more sensitive compared to other tests assessing the same functional abilities. Conclusion: the conducted study is the first to include a sample of individuals with specific cardiovascular function (prehypertension). The IFT 30-15 test proved to be a relatively simple and cost-effective test, also suitable for larger groups. The obtained results and variable values provide more accurate insights into the physical fitness of individuals with elevated blood pressure levels.
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