Effect of Exercise and Thermal Stress on Subcutaneous Protein Transport

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  • 森本 武利
    Department of Physiology, Kyoto Prefectural University of Medicine
  • 白木 啓三
    Department of Physiology, Kyoto Prefectural University of Medicine
  • 三木 健寿
    Department of Physiology, School of Medicine, University of Occupational and Environmental Health
  • 田中 義文
    Department of Physiology, School of Medicine, University of Occupational and Environmental Health

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  • Effect of Exercise and Thermal Stress o

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Radioiodinated albumin was injected into the subcutaneoustissue of the thigh of human subjects and its disappearance rate fromthe injection site and the blood levels of the tracer were comparedbetween exercise loaded, heat loaded experiments and the controlutilizing two-compartment analysis. The time course of radioactivityin the blood was expressed as the equation p(t)=A (e-αt- e-βt) . In theexercise experiment, the half-time of β and the time required to reachthe maximum level was significantly shorter than in the heat experimentand in the controls. The decay of radioactivity at the injection site wasset to the equation s (t)=Be-γt+Ce-δtby the least square method.The value of γ, which had a half-time of about 24 hr, was significantlyshorter in the exercise than in the control experiments. From theseresults, it was concluded that the rate of mobilization of subcutaneousprotein via lymph flow is faster under an exercise load than the control, and that the rate under heat load does not deviate from controlexperiments.

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