Cardiac Fitness Index based on Treadmill Heart Rate monitoring and it’s Mathematical Simulation

: In a clinic, cardiologists use the heart rate variation to determine the cardiac fitness of a patient. For this purpose, they monitor their heart rate while on the treadmill and after the patient has gone off the treadmill. However, they only monitor their heart rate values, and not the trend of the heart rate variation. In order to characterize the cardiac fitness, we need to develop an index which describes the trend of heart rate variation while on and off the treadmill. In this paper, we have determined the heart rate variation equation. The equation for on the treadmill is given by: HR = HRe*t^-k2. The range of k1 was found to be 0.2 to 0.25. The range of k2 was found to be -0.2 to -0.3. Then we formulated the Cardiac Fitness Index (CFI) Formula: CFI = k2/k1×HRo/(HRe-HRo)× (HRe-HRf)/HRe ×100 HRo is the initial rate at the time of getting on the treadmill, HRe is the heart rate at the end of 10 minutes on the treadmill, and HRf is the final value of the heart rate at 10 minutes after getting off the treadmill. In this evaluated four patients and calculated their values of their CFIs. Based on this, we found the range of CFI to be from 87 to 34 with 87 being the highest and 34 being the lowest. Our intent is to monitor more subjects and find out the ranges for normal subjects and find out the ranges for normal subjects and subjects with cardiac symptoms. This can enable the cardiologist to diagnose a subject with cardiac issues and recommend the subject for further tests, to determine the precise nature of the cardiac problem. Now our Cardiac Fitness Index can be employed by cardiologists to make that decision. In fact, it can also be used at home to determine the cardiac fitness, and stay fit. Thus, our paper will enable both medical and non-medical people to assess their cardiac fitness and hence will have a wide range of applications.

PECULIARITY OF HEART RATE VARIABILITY IN STUDENTS WITH DIFFERENT INTENSITY OF PHYSICAL LOAD

We studied the heart rate variability among students of the direction “Physical culture and life safety” with a high level of physical activity and students of the department of biology with a lower level of physical activity. It was revealed that higher physical activity of students provides a favorable level of heart rate variation, a type of regulation of the cardiovascular system, and increases the reserve capacities of the student body.

Variación de la velocidad y la frecuencia cardiaca durante un maratón en un ambiente caluroso

The purpose of the study was to analyze the variation of running speed and heart rate in amateur runners during a marathon in a hot environment. Eighteen runners (weight: 65.2 ± 12.21 kg, height: 168.4 ± 10.6 cm, VO2max: 52.9 ± 7.1 ml/kg/min) took part of a beach-side marathon (42195 m) under a temperature of 27.8 ± 3.52 ºC and at 0-80 m altitude. Pearson’s correlation showed a significant linear relationship between the increase in thermal stress index (WGBT) and the speed variation (r= 0.168, p= 0.049). In this respect, the total duration of the race revealed a direct relationship with speed (r= 0.675, p= 0.003) and heart rate (r= 0.631, p= 0.007) variation. Multiple regressions analysis showed that 61.6% of the final race time was explained by the speed variation in the 26 to 30 km course section (r2= 0.61; F= 26.17; p< 0.001) and 37% by the heart rate variation in the 31 to 35 km section (r2= 0.37; F= 10.38; p< 0.001). In conclusion, an increase in the environmental temperature provoked a decrease in running pacing, with a stronger effect in the second half of the race. Therefore, coaches should take these aspects into account in training and strategies to mitigate the impact of these conditions on the physical and physiological performance of amateur runners.