TY - JOUR
T1 - Autonomic nervous system responses to exercise in relation to ventilatory threshold
AU - Yamamoto, Y.
AU - Hughson, R. L.
AU - Nakamura, Y.
N1 - Funding Information:
This study was supported in part by grants from the Ministry of Education, Japan (02951196), from Meiji Life Foundation of Health and Welfare, Japan, and from the Natural Sciences and Engineering Research Council of Canada. The authors are grateful to Isao Muraoka, Professor of Waseda University, and Minora Shinohara, M.Sc., at University of Tokyo for their help in conducting part of the experiments in this study.
PY - 1992
Y1 - 1992
N2 - We introduce our recent approach to study autonomic nervous system control of heart rate during exercise by means of heart rate variability (HRV) spectral analysis with special reference to its relationship to ventilatory threshold (Tvent). The rationale for the study was that HRV has been shown to reflect (cardiac) parasympathetic and sympathetic nervous system (PNS and SNS, respectively) activity, together with the underlying complexity of cerebral autonomic system in terms of fractal dimension (DF) of HRV time series. The experimental results showed that PNS was markedly reduced below Tvent, that the rate of change in sympathoadrenal activity indicators (plasma norepinephrine and epinephrine concentrations and SNS indicator) was enhanced above Tvent, and that these changes in PNS and SNS indicators were associated with the appearance of the low-dimensional (low DF) dynamics that might reflect less complex autonomic activity. These findings have been considered with respect to implication for clinical cardiology.
AB - We introduce our recent approach to study autonomic nervous system control of heart rate during exercise by means of heart rate variability (HRV) spectral analysis with special reference to its relationship to ventilatory threshold (Tvent). The rationale for the study was that HRV has been shown to reflect (cardiac) parasympathetic and sympathetic nervous system (PNS and SNS, respectively) activity, together with the underlying complexity of cerebral autonomic system in terms of fractal dimension (DF) of HRV time series. The experimental results showed that PNS was markedly reduced below Tvent, that the rate of change in sympathoadrenal activity indicators (plasma norepinephrine and epinephrine concentrations and SNS indicator) was enhanced above Tvent, and that these changes in PNS and SNS indicators were associated with the appearance of the low-dimensional (low DF) dynamics that might reflect less complex autonomic activity. These findings have been considered with respect to implication for clinical cardiology.
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U2 - 10.1378/chest.101.5_supplement.206s
DO - 10.1378/chest.101.5_supplement.206s
M3 - Article
C2 - 1576836
AN - SCOPUS:0026685636
SN - 0012-3692
VL - 101
SP - 206S-210S
JO - Chest
JF - Chest
IS - 5 SUPPL.
ER -