Ventilatory and Gas Exchange Responses under Spontaneous and Fixed Breathing Modes during Arm Exercise
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概要
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To evaluate the difference of ventilatory and gas exchange response differences between arm and leg exercise, six healthy young men underwent ramp exercise testing at a rate of 15W・min^-1 on a cycle ergometer separately under either spontaneous (SPNT) or fixed (FIX) breathing modes, respectively. Controlled breathing was defined as a breathing frequency (J_b; 30 breaths. min^-1) which was neither equal to, nor a multiple of, cranking frequency (50 rev・min^-1) to prevent coupling of locomotion and respiratory movement, i.e., so-called locomotor-respiratory coupling (LRC). Breath-by-breath oxygen uptake (Vo_2), ventilation (V_E), CO_2 output (V_co_2),tidal volume (V_T), f_b and end-tidal P_co_2 (P_ET_CO_2) were determined using a computerized metabolic cart. Arm exercise engendered a higher level of V_O_2 at each work rate than leg exercise under both FIX and SPNT conditions. However, FIX did not notably affect the V_O_2 response during either arm or leg exercise at each work rate compared to SPNT. During SPNT a significantly higher f_b and lower P_ET_CO_2 during arm exercise was found compared with leg exercise up to a f_b of 30 breaths. min^-1 while V_E and V_T were nearly the same. During fixed breathing when f_b was fixed at a higher rate than during SPNT, a significantly lower P_ET_CO_2 was observed during both exercise modes. These results suggest that: 1) FIX breathing does not affect the V_O_2 response during either arm or leg exercise even when non-synchronization between limb locomotion movement and breathing rate was adopted; 2) at a f_b of 30 breaths. min^-1 FIX breathing induced a hyperventilation resulting in a lower P_ET_CO_2 which was not associated with the metabolic rate during either arm or leg exercise, showing that VE during only leg exercise under the FIX condition was significantly higher than under the SPNT condition. J Physiol Anthropol 21 (5): 239-245, 2002 http://www.jstage.jst.go.jp/en/
著者
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西 勝英
熊本大学医学薬学研究部生体機能薬理学教室
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FUKUOKA Yoshiyuki
Laboratory of Applied and Environmental Physiology, Prefectural University of Kumamoto
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Fukuba Yoshiyuki
Research Institute For Radiational Biology And Medicine Hiroshima University
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NISHI KATSUHIDE
Department of Pharmacology, Kumamoto University Medical School, Kumamoto, Japan
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Araki Haruo
Araki Heart Clinic
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Nishi Katsuhide
Department Of Cell And Biological Pharmacology Kumamoto University
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Fukuoka Yoshiyuki
Laboratory Of Applied And Environmental Physiology Faculty Of Environmental And Symbiotic Science Pr
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ITOH Masahiro
Laboratory Health and Physical Education, Kumamoto University College of Medical Science
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Endo Masako
Laboratory of Applied and Environmental Physiology, Faculty of Environmental and Symbiotic Science,
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Kagawa Harumi
Laboratory of Applied and Environmental Physiology, Faculty of Environmental and Symbiotic Science,
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Endo Masako
Faculty Of Environmental And Symbiotic Sciences Prefectural University Of Kumamoto
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Kagawa Harumi
Department Of Environmental And Symbiotic Sciences Prefectural University Of Kumamoto
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Kagawa Harumi
Faculty Of Environmental And Symbiotic Sciences Prefectural University Of Kumamoto
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Nishi Katsuhide
Department Of Biopharmaceutics Graduate School Of Pharmaceutical Sciences Kumamoto University
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Fukuoka Yoshiyuki
Prefectural University Of Kumamoto Masahiro Itoh Kumamoto University
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