Abstract
Thirteen young male subjects first lied in the supine position on bed with eyes opened for 10 min, followed by 10 min exercise of a cycle ergometer with a load randomly chosen among three different ones inducible heart rates as high as 15, 30, or 60% of the predicted maximal heart rate, and again took a supine position as during the first rest for 40 min. ECG and EGG were measured by using bio-amplifiers during all the experimental period, AD converted at the rate of 1kHz and stored into PC. RR-intervals obtained from ECG were Fourier transformed by every 64, serially from the top to the end of the file with doubling about its 50%. Cardiac sympathetic (CS) as well as parasympathetic nerve activities (CPS) were assumed from the power in high-frequency band (HF), and the relative magnitude of the power in low-frequency band (LF) to HF, respectively. EGG re-sampled by 10 Hz from the row EGG datum was Fourier transformed by every 512, serially from the top to the end, with doubling about its 50%. The power summed in the range between 2.4 and 3.6 cpm was assumed to be gastric parasympathetic nerve activities (GPS). CPS tended to increase only during 10-20 min district after 30% exercise (ex30). GPS was significantly increased during 10-15 min district (p<0.05) in the post-ex30 period. Either CPS or GPS after 60% exercise was significantly depressed. These results suggested that moderate exercise could augment parasympathetic nerve activities, particularly in the gastric region. [J Physiol Sci. 2006;56 Suppl:S143]
