Abstract

There are some differences and individualities of hierarchy of physiological mechanism in elite athletes and non-athletes’ cohorts while exercising. Mobilization of various physiological systems and mechanisms depends on the type of exercising, thus the analysis of cardiovascular parameters may highlight the central and peripheral interactions and reveal the fundamental synergies that exist between the central and peripheral cardiovascular changes. The task of this study was to determine the influence of physical working capacity of patient’s on cardiovascular changes while performing repetitive exercises designed to develop spinal muscles. The 27 healthy male volunteers were involved in this study. First of all, the study participants performed the incremental exercise stress test, and according to their physical working capacity group was divided into two sub-groups. First sub-group included the subjects who were able to carry the load 250 W or more (higher physical capacity sub-group). Second sub-group consisted of the subjects who were able to carry the load of less than 250 W (a lower physical working capacity sub-group). Two days later, subjects performed three bouts of workloads designed for development of spinal musculature, i.e. the 25 s trunk flexion movement. Rest intervals between bouts were 2 minutes. Every 30 s 12-leads ECG was recorded and the arterial blood pressure was measured. The results obtained during the incremental exercise testing demonstrated that the maximum heart rate values were registered during the maximum load, i.e. before the inability to continue the task (162.6 ± 5.4 beats/ min). At this moment the functional ischemic episodes were observed (ST-segment depression increased up to 0.48 ± 0.11 mV). The results of research assessing cardiovascular functional parameters change during the bouts of workloads designed for development of spinal musculature showed that there were no significant ST-segment changes as it was during exercise stress testing. Assessing changes in pulse blood pressure during exercising showed that the greatest change was observed during the third repetition. The most noticeable difference between the sub-groups was significantly higher pulse blood pressure change during the repetition of exercise, and second, fast recovery from exercising was the feature of the second sub-group. Meanwhile, the smaller physical working capacity sub-group after the exercise was characterized by a slower recovery. The study results allows to conclude that muscular blood supply and oxygen delivery to active musculature during the repetitive workloads designed for development of spinal musculature can be achieved by varying the power of activating the central and peripheral circulatory mechanisms. Lower than the average functional fitness of individuals with the same degree of change in blood pressure pulse occurs due to significantly higher systolic blood pressure levels (centre – heart rate), it is higher than the average functional fitness of individuals with the same degree of change in blood pressure pulse occurs due to a higher diastolic blood pressure decrease (peripheral arterial vasodilation). Verf.-Referat