Effectiveness of Moderate Intensity Interval Training as an Index of Autonomic Nervous Activity

Abstract

The purpose of this study was to examine the effects of moderate intensity interval training from the change of the autonomic nervous activity. Ten male volunteers aged 21-22 years were studied. After 10-minute rest in a seated position, the subjects were asked to perform the strength of moderate cycling exercise in ergometer. Cycling rate was done in 50 times/min. Load resistance of the ergometer was set to 2.0 kgm. Subjects paused the exercise when the heart rate becomes 120 beats/min. Subjects have resumed the exercise when the heart rate returns to the value at rest. This trial was repeated twice. The experiment was ended when the heart rate of the subjects has returned to resting level. When the heart rate during exercise is maintained to less than 120 beats/min, sympathetic nerve activity during exercise did not work actively compared to the baseline. Vagus nerve activity after exercise cessation exceeds the baseline. It is clarified that the exercise as well as activating the vagus nerve activity stimulates the total autonomic nervous activity. It has revealed that at the time of interval training at moderate load the vagus nerve activity can be carried out.

Exercising the hepatobiliary‐gut axis. The impact of physical activity performance

“…184 Change in gut microbiota during physical exercise might also induce additional anti-inflammatory effects. 185 Regular physical activity also leads to increased vagal tone 186,187 and decreased expression of inflammatory markers, 187 although recent studies provide conflicting results or suggest reduction in circulatory apoptosis marker 112,188 , an effect correlating with high cardiorespiratory fitness. 185 Ursodeoxycholic acid and lithocholic acid have been recently shown to have anti-inflammatory properties by decreasing the release of proinflammatory cytokines while increasing macrophage release of anti-inflammatory cytokines.…”

“…185 Ursodeoxycholic acid and lithocholic acid have been recently shown to have anti-inflammatory properties by decreasing the release of proinflammatory cytokines while increasing macrophage release of anti-inflammatory cytokines. 185 Regular physical activity also leads to increased vagal tone 186,187 and decreased expression of inflammatory markers, 187 although recent studies provide conflicting results or suggest reduction in circulatory apoptosis marker 112,188 , an effect correlating with high cardiorespiratory fitness. 189 This scenario might also involve a neurohormonal mechanism with vagal-mediated gallbladder emptying before exercise.…”

Cardiac Autonomic Nervous System Activity during Slow Breathing in Supine Position

“…Nevertheless, slow breathing in the supine position does not stimulate vagal nerve activity, but stimulates sympathovagal balance activity. However, the load is low, and in the previous study, the ln LF/HF ratio in the resting position was around 2 [ 1 ], and the ln LF value in the resting supine position was in the range of 3.7 to 7.2 [ 2 – 7 ]. The sitting ln LF value is in the range 5.2-7.7 [ 5 , 20 , 21 ].…”

“…Therefore, it is desired to develop a method for activating cardiac ANS activity. Previous studies have reported that cardiac ANS activity is enhanced by interval training and slow breathing exercise [ 1 , 8 ]. However, disuse disorders occur due to aging; it is necessary to ensure safety and security by appropriate methods.…”

“…Heart rate variability (HRV) is a popular research tool for assessing cardiac autonomic nervous system (ANS). HRV has also been used in studies to monitor the recovery of heart rate after exercise [1] and to reveal changes due to different postures [2][3][4][5][6][7]. However, HRV has not been used in studies that reveal cardiac ANS activity during exercise intervention in a supine position.…”