The Condition of Central and Autonomic Nervous Systems in the Recovery Period After the Refusal of Intensive Physical Load

Abstract

The article is devoted to studying the condition of central and autonomic nervous systems in the recovery period after the refusal of intensive physical load. The study involved 25 young men aged 18, 4 ± 0, 3 year. Each of them, it was offered a test with increasing in intensity step-dosed physical load on the cycle ergometer.
 
 "Sports Art 5005" ergometer was used for load testing and the testing itself was conducted under ECG and EEG control. A spectral analysis of ECG and analysis of heart rate variability were conducted. The heart rate, Kerdo index, stroke volume, cardiac output blood flow were calculated. The full EEG spectral power and spectral powers of separate rhythms were evaluated. Blood pressure was measured in the «background» status, at the moment of failure to take the load and after the recovery. The authors evaluated the level of self-feeling and fixed subjective complaints.
 
 It is shown, that at the time of failure of intense load subjects reach of the limit of their physical capacity level, which is reflected in the increasing of sympathetic effects. It´s marked in increase in heart rate and hemodynamic parameters. At time when the motoric program was stopped, the subjects were begun to the recovery. It was accompanied by a significant increase in spectral power of delta waves in the prefrontal and occipital cortex of the left and right hemispheres in the 1st minute of recovery. The appearance of delta waves was due to the increasing of inhibitory processes in the cerebral cortex as a result of fatigue and they have of defensive nature. The recovery process is characterized by significant reorganizations of vegetative regulation mechanisms. It was marked a sharp increase in spectral power of VLF -waves on the third minute of recovery and a reducing of heart rate variability to the 6-th minute of recovery. Thus, the recovery process after intense physical load is characterized by significant reorganizations in condition of central nervous system and autonomic nervous system.

Indicators of a Cardiovascular System at 14–15 Years Old Boys at Short-term Biofeedback Training for Controlling of General Heart Rate Variability After Speed and Power Training: Experimental Controlled Study

“…Сохранение симпатической активности и даже некоторое нарастание ее в восстановительный период после выполнения нагрузки у лиц группы контроля свидетельствует об активизации центральных механизмов сердечно-сосудистой регуляции, что нередко выявляется у молодых людей мужского пола. Так, по данным литературы, у юношей 18-19 лет после нагрузки на велоэргометре на пределе физических возможностей на 6-й мин восстановительного периода происходит снижение общей спектральной мощности ВСР и усиление сверхнизкочастотной активности ВСР [32]. По данным настоящего исследования, даже испытание кратковременной нагрузки скоростно-силового характера вызывает аналогичные вышеуказанным изменения вариабельности сердечного ритма у мальчиков-подростков в виде отсроченного повышения индекса напряжения регуляторных систем и снижения общей мощности спектра ВСР (значимо ниже, чем у лиц, проводивших БОС-тренинг) на том же временном этапе восстановительного периода (к концу 6-й мин после нагрузки).…”