Journal
AMERICAN JOURNAL OF PHYSIOLOGY-REGULATORY INTEGRATIVE AND COMPARATIVE PHYSIOLOGY
Volume 300, Issue 4, Pages R969-R977Publisher
AMER PHYSIOLOGICAL SOC
DOI: 10.1152/ajpregu.00768.2010
Keywords
heart rate variability; transfer function; systems analysis
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Funding
- Ministry of Health, Labor and Welfare of Japan [H18-nano-Ippan-003, H19-nano-Ippan-009, H20-katsudo-Shitei-007, H21-nano-Ippan-005]
- Ministry of Education, Culture, Sports, Science and Technology in Japan [19700559]
- New Energy and Industrial Technology Development Organization of Japan
- Japan Society for the Promotion of Science for Young Scientists
- Grants-in-Aid for Scientific Research [19700559] Funding Source: KAKEN
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We examined the transfer function of autonomic heart rate (HR) control in anesthetized sedentary and exercise-trained (16 wk, treadmill for 1 h, 5 times/wk at 15 m/min and 15-degree grade) rats for comparison to HR variability assessed in the conscious resting state. The transfer function from sympathetic stimulation to HR response was similar between groups (gain, 4.2 +/- 1.5 vs. 4.5 +/- 1.5 beats.min(-1).Hz(-1); natural frequency, 0.07 +/- 0.01 vs. 0.08 +/- 0.01 Hz; damping coefficient, 1.96 +/- 0.55 vs. 1.69 +/- 0.15; and lag time, 0.7 +/- 0.1 vs. 0.6 +/- 0.1 s; sedentary vs. exercise trained, respectively, means +/- SD). The transfer gain from vagal stimulation to HR response was 6.1 +/- 3.0 in the sedentary and 9.7 +/- 5.1 beats.min(-1).Hz(-1) in the exercise-trained group (P = 0.06). The corner frequency (0.11 +/- 0.05 vs. 0.17 +/- 0.09 Hz) and lag time (0.1 +/- 0.1 vs. 0.2 +/- 0.1 s) did not differ between groups. When the sympathetic transfer gain was averaged for very-low-frequency and low-frequency bands, no significant group effect was observed. In contrast, when the vagal transfer gain was averaged for very-low-frequency, low-frequency, and high-frequency bands, exercise training produced a significant group effect (P < 0.05 by two-way, repeated-measures ANOVA). These findings suggest that, in the frequency domain, exercise training augments the dynamic HR response to vagal stimulation but not sympathetic stimulation, regardless of the frequency bands.
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