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Effects on Modulation of Vagal Activity in Moderate Habitual Exercise:Phasic decay in heart rate responses immediately after exercise cessation Noriko Miyamoto 1,2 , Masuo Muro 3 1Department Liberal Arts, Tokyo University of Pharmacy and Life Science School of Pharmacy 2Department of Physiology, Toho University School of Medicine 3Department of Exercise Physiology and Biomechanics, Toho University School of Medicine Keyword: 迷走神経活動 , 心拍数減衰時定数 , 運動習慣 , vagal activity , HR decay time constant , habitual aerobic exercise pp.187-192
Published Date 2000/2/15
DOI https://doi.org/10.11477/mf.1404902047

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  • Abstract
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We investigated the effect of anerobic threshold (AT)training and that of habitual aerobic exercise (walkingmore than 10,000 steps a day) on the dynamic heart ratereactivity. In six healthy subjects, anerobic threshold(AT) training (pedaling exercise on bicycle ergometer,30 min a day, 3-4 times a week, 12 weeks) was perfor-med. After the training, heart rate, systolic and diastolicblood pressure at rest did not change while the timeconstant of the heart rate recovery (HRTC) immediatelyafter cessation of 6 min-long pedaling exercise,significantly decreased in all six subjects. The HRTC wasmeasured also in three groups of middle aged (30-69years old) male and female volunteer subjects, thosewith exercise habit (n=43), those without exercisehabit (n=48), and patients suffering from diabetesmellitus or hypertension but under strict medical control(n=18). The HR, was at much higher level in thepatient group than in other two groups. The HRTCshowed positive correlation with age in each subjectgroup (the correlation was statistically significantexcept for the patient group). The correlationcoefficient was significantly smaller in the group withexercise habit than other two groups. It is suggestedthat both AT-level training and habitual exerciseimprove reactivity of vagal and arterial baroreflexsystems.


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