心拍出量に及ぼす姿勢と気温の影響

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タイトル別名
  • Effect of Posture on Cardiac Output under Different Air Temperature Conditions
  • ココロ ハクシュツリョウ ニ オヨボス シセイ ト キオン ノ エイキョウ

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Cardiac output during rest in seven postures was determined by a CO2 rebreathing method in 12 male students under the air temperature conditions of 20°C, 30°C, and 40°C. The mixed venous C02 pressure was calculated from the rise of the CO2 percent in a rubber bag during rebreathing. Arterial C02 pressure was assumed to be the same as in end-tidal air. CO2 output was measured by the Douglas bag technique. Fick's equation was used for calculation of the cardiac output.<br>The factor of posture produced a significant effect on cardiac output. The significant correlation coefficients between cardiac output and O2 uptake in each posture indicated a close relationship between them. The regression equations of cardiac output on O2 uptake throughout all seven postures were calculated in each air temperature condition, and then the cardiac output for each posture was adjusted by the differences in O2 uptake along the regression equations. Generally, the postures with higher projected height were shown to have lower adjusted cardiac output. However, half rising posture, which has the highest projected height but one, was shown to have fairly high adjusted cardiac output. It was indicated that a gravitational shift in blood volume to the legs was counteracted by the contraction of lower limb muscles in half rising posture. The factor of air temperature showed no significant influence on the regression of cardiac output on O2 uptake. The prediction equations for cardiac output during rest in each seven posture from air temperature, body weight, height, heart rate, and O2 uptake were calculated by the multiple regression analysis. The factor of posture produced significant effects on the constants and the partial correlation coefficients of the multiple regression equations of cardiac output. In addition to the above-mentioned five variables, the value of cardiac output during keeping any one of lying, sitting or standing posture was used to make the different type of prediction equations for cardiac output in each of the seven postures. High multiple correlation coefficients and significant F ratio indicated the validity of these equations.

収録刊行物

  • 人類學雜誌

    人類學雜誌 87 (2), 146-152, 1979

    一般社団法人　日本人類学会

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