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  • 1 Hokkaido University Laboratory of Exercise Physiology, Faculty of Education Kita-ku Sapporo Japan
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The purpose of the present study was to examine how end tidal CO2 pressure (PETCO2) is controlled in impulse exercise. After pre-exercise at 25 watts for 5 min, impulse exercise for 10 sec with 200 watts followed by post exercise at 25 watts was performed. Ventilation (V̇E) significantly increased until the end of impulse exercise and significantly re-increased after a sudden decrease. Heart rate (HR) significantly increased until the end of impulse exercise and then decreased to the pre-exercise level. PETCO2 remained constant during impulse exercise. PETCO2 significantly increased momentarily after impulse exercise and then significantly decreased to the pre-exercise level. PETCO2 showed oscillation. The average peak frequency of power spectral density in PETCO2 appeared at 0.0078 Hz. Cross correlations were obtained after impulse exercise. The peak cross correlations between V̇E and PETCO2, HR and PETCO2, and V̇E and HR were 0.834 with a time delay of −7 sec, 0.813 with a time delay of 7 sec and 0.701 with a time delay of −15 sec, respectively. We demonstrated that PETCO2 homeodynamics was interactively maintained by PETCO2 itself, CO2 transportation (product of cardiac output and mixed venous CO2 content) into the lungs by heart pumping and CO2 elimination by ventilation, and it oscillates as a result of their interactions.

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Senior editors

Editor(s)-in-Chief: Rosivall, László

Honorary Editor(s)-in-Chief): Monos, Emil

Managing Editor(s): Bartha, Jenő; Berhidi, Anna

Co-editor(s): Koller, Ákos; Lénárd, László; Szénási, Gábor

Assistant Editor(s): G. Dörnyei (Budapest), Zs. Miklós (Budapest), Gy. Nádasy (Budapest)

Hungarian Editorial Board

      Benedek, György (Szeged)
      Benyó, Zoltán (Budapest)
      Boros, Mihály (Szeged)
      Chernoch, László (Debrecen)
      Détári, László (Budapest)
      Hamar, János (Budapest)
      Hantos, Zoltán (Szeged)
      Hunyady, László (Budapest)
      Imre, Sándor (Debrecen)
      Jancsó, Gábor (Szeged)
      Karádi, Zoltán (Pécs)
      Kovács, László (Debrecen)
      Palkovits, Miklós (Budapest)
      Papp, Gyula (Szeged)
      Pavlik, Gábor (Budapest)
      Spät, András (Budapest)
      Szabó, Gyula (Szeged)
      Szelényi, Zoltán (Pécs)
      Szolcsányi, János (Pécs)
      Szollár, Lajos (Budapest)
      Szücs, Géza (Debrecen)
      Telegdy, Gyula (Szeged)
      Toldi, József (Szeged)
      Tósaki, Árpád (Debrecen)

International Editorial Board

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      W. Benjelloun (Rabat)
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      D. Djuric (Belgrade)
      C. Fry (London)
      S. Greenwald (London)
      O. Hänninen (Kuopio)
      H. G. Hinghofer-Szalkay (Graz)
      Th. Kenner (Graz)
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      M. Mahmoudian (Tehran)
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      T. Sakata (Oita)
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      Cs. Szabo (Beverly)
      E. Vicaut (Paris)
      N. Westerhof (Amsterdam)
      L. F. Zhang (Xi'an)

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Acta Physiologica Hungarica
Language English
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Year of
Foundation
1950
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changed title
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per Year
 
Founder Magyar Tudományos Akadémia
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H-1051 Budapest, Hungary, Széchenyi István tér 9.
Publisher Akadémiai Kiadó
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H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
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Chief Executive Officer, Akadémiai Kiadó
ISSN 0231-424X (Print)
ISSN 1588-2683 (Online)

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