Volumetric respiratory variability as a criterion of body recovery after physical load

Abstract

Purpose. The aim of this study was to determine changes in volumetric respiratory variability in physically fit individuals during recovery after physical exercise. Material & Methods. To achieve the goal with the spiroarteriocardiorhythmograph (SACR) device, 101 male athletes aged 22.3±2.4 years were examined. The procedure for studying the respiratory system included conducting measurements in a sitting position using the SACR device for 2 minutes. The initial measurement was carried out immediately before the start of training (c1), 5-7 min. After the training session, a second registration (C2) was carried out the following morning on an empty stomach. A third registration (C3) was carried out the next morning after training. Results. Considering the received data, the changes in the TPR (L×min-1)2 and HFR (L×min–1)2 indicators, which characterize the effect of physical load, are worth noting. For TPR (L×min–1)², at c1 – 327.6 (210.3; 538.2), at c2 – 497.3 (309.8; 1036.8) and at c3 – 302.8 (179.6; 458.0), f=18.1 and p=0.000. It is noteworthy that there were no significant changes in the LFR (L×min-1)2 indicator, which characterizes low-frequency effects on breathing, which, in our opinion, is associated with reflex stimulation of sympatho-adrenal mechanisms during physical load at the level of hemodynamic support, when the role of central mechanisms is significantly reduced. The VLFR (L×min–1)2 indicator, which is associated with central effects on breathing, has a certain informative value. 5-7 minutes after physical load, its values are significantly different from the initial VLFR (L×min–1)2, at c1 – 2.0 (1.0; 3.6) vs. c2 – 3.2 (2.0; 6.8), f=4.7, p=0.007. However, the next morning (c3) it has intermediate values that do not significantly differ from the previous ones (c1 and c2). Conclusions. The results of the volumetric respiratory variability study suggest that TPR (L×min–1)2 and HFR (L×min–1)2 are clearly related to physical load and recovery after it, which complements information on the impact of physical activity on the respiratory system and its recovery after it.