Relationship between Heart rate variability and some Pulmonary functions of handball players

The researchers reached the following conclusions in light of the procedures and sample of the study and methods of statistical analysis followed:
1- There is a significant correlation between pulmonary functions and the rate of change in the Heart rate variability (HRV) represented in the rate of pumping blood from the left atrium to the left
ventricle (MV) and the airflow reserve (ERV).
2- The average difference between R-R and CVr-r intervals for handball players at stable limits.
3- There is also a correlation between the difference between the Heart rate variability (HRV) during inhalation and exhalation (I.E) and the difference between different wave distances (CV R-R) at (0.535).
4- There is no indication between the pulmonary functions and the combined strength of the nervous system of the heart and the overall strength of the low and high pulses of the heart.
5- There is also no correlation between pulmonary functions and the standard deviation of mean squared differences between R-R (SD) intervals, average square differences between R-Rs (MSSD).