Relationship among First Heart Sound Amplitude, Double Product and Cardiac Parasympathetic Nervous System Modulation during Graded Exercise

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概要

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• The present study was conducted to determine the relationships among the breaking point of first heart sound amplitude (HSBP), double product breaking point (DPBP) and the breaking point of log HF (HFBP) in graded exercise. Twelve healthy Japanese males volunteered to participate in the present study. All subjects gave their informed consent prior to participation in this study. Each subjects performed graded exercise consisting of 90 seconds of exercise at pedaling rate of 60rpm on an electrically braked cycle ergometer. The intensity of exercise was started at 10 watts and was increased 10 watts at every step of the graded exercisd presse. Heart rate (HR), heart sounds amplitude (HS), blooure and cardiac autonomic nervous system activity were measured at each exercise step. The subjects were instructed to stop the exercise when their RPE was reached 15-16 or when the HR reached 160bpm. The HSBP, DPBP and HFBP were calculated. HR, SBP, DP and HS were increased with increased workload. The log HF decreased with increasing workload. We observed significant relationships between DPBP and HSBP, and between DPBP and HFBP. In addition, there were significant relationships between HSBP and HFBP. The HFBP was significantly lower than DPBP and HSBP. The present study reports the following new findings: in graded exercise, the DP, HS and log HF exhibited similar response characteristics; the workload for the HFBP correlated significantly with the workload for DPBP and for HSBP, and was reached at a lower exercise intensity than the workload for DPBP and for HSBP. These data suggested it is evident that, in graded exercise, double product, the first heart sounds and cardiac parasympathetic nervous system modulation are interacted and that cardiac parasympathetic nervous system activity is attenuated before the anaerobic threshold is reached.

著者

• Seki Kazutoshi

  Univ. of marketing and distribution sci.

• Yoshioka Akira

  Graduate School Kawasaki Univ. Of Med. Wel.

• Onodera Sho

  Kawasaki Univ. Of Med. Wel.

• Onodera Sho

  Department Of Health And Sports Science Faculty Of Health Science And Technology Kawasaki University

• Seki Kazutoshi

  University Of Marketing And Distribution Sciences

• Obara Shigeru

  Faculty Of Integrated Arts And Sciences The University Of Tokushima

• Nishimura Kazuki

  Hiroshima Inst. Of Technology

• Seki Kazutoshi

  Department Of Hospital And Welfare Service University Of Marketing And Distribution Science

• Takahara Terumasa

  Doctoral Program in Health Science, Graduate School of Health Science and Technology, Kawasaki Unive

• Nishimura Kazuki

  Department Of Global Environment Studies Hiroshima Institute Of Technology

• Yoshioka Akira

  Faculty Of Medicine Kagawa University

• SEKI Kazutoshi

  Faculty of Service Industries, University of Marketing and Distribution Science

• Takahara Terumasa

  Doctoral Program In Health Science Graduate School Of Health Science And Technology Kawasaki Univers

• Obara Shigeru

  Faculty Of Integrated Arts And Science University Of Tokushima

• Seki Kazutoshi

  Faculty Of Service Industries University Of Marketing And Distribution Science

• Nishimura Kazuki

  Department Of Global Environment Studied Hiroshima Institute Of Technology

• Onodera Sho

  Department Of Health And Sports Science Faculty Of Health Science And Technology Kawasaki University

• Onodera Sho

  Department Of Health And Sports Science Faculty Of Health Science And Technology Kawasaki University

• Onodera Sho

  Department Of Health And Sports Science Faculty Of Health Science And Technology Kawasaki University

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