<Originals>Age-associated Changes in Renal Function After Exhaustive Exercise in Healthy Males Ranging in Age From 8～80 Years Old
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概要
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This study was conducted to examine the effects of age on changes in renal function after exhaustive exercise in 162 healthy males ranging in age from 8 to 80 yrs. Voluntary exhaustive exercise was performed using a treadmill. VO_2max and HRmax were measured. Blood and urine samples were taken before, immediately after, and at 30/60 min after exercise. These specimens were used for measurements of electrolyte, lactate (LA), creatinine (Cr) and albumin concentrations. Cr clearance (Ccr) was calculated as an indicator of the glomerular filtration rate. VO_2max, HRmax, and maximal concentration of blood LA (bLAmax), measured immediately after exercise, lowered with age while peaks of these variables occurred at differing ages, respectively. Urinary albumin excretion (UAE) rose remarkably 30 min after exercise (UAE_<rec30 min>) in every age group. The highest increase in UAE_<rec30 min> was at 16〜19 yrs of age, and thereafter gradually decreased with age. A highly positive correlation (r=0.819, p<0.001) was indicated between UAE and urinary LA excretion (ULAE). A remarkable reduction in the concentration of Cl^- compared to that of Na^+ in urine 30 min after exercise may compensate for an increase in the urinary anion gap, which was the greater part of the increase in ULAE. It is thought that the excess amount of LA produced by exercise was filtered through the glomerulus, and preferentially excreted into urine in order to normalize the acid-base balance disturbed by exercise. The present results suggest that the organic acids produced by exercise might alter renal glomerular permeability and/or inhibit reabsorption of albumin at proximal tubules while the precise mechanisms for exercise-induced albuminuria are still unknown. It may be concluded that age-associated changes in renal function after exhaustive exercise might become fewer as the result of a reduction of energy production with aging in skeletal muscles during exercise.
- 日本運動生理学会の論文
著者
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Suzuki Masato
Department of Laboratory Medicine, The Jikeikai University School of Medicine
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Suzuki Masato
Department Of General Surgery Chiba University Graduate School Of Medicine
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Suzuki Masato
Department Of Health And Sports Science Faculty Of Education Yamaguchi University
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ISHIYAMA Ikuo
Kokugakuin Tochigi Junior College
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SEINO Tetsuya
Liberal Arts Division, Kisarazu National College of Technology
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ISHIYAMA Ikuo
Department of Elementary Education, Kokugakuin Tochigi Junior College
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SUZUKI Masato
The Jikeikai Univ. School of Med
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Seino Tetsuya
Liberal Arts Division Kisarazu National College Of Technology
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Ishiyama Ikuo
Department Of Elementary Education Kokugakuin Tochigi Jr. College
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Suzuki Masato
Department Of Bioengineering Graduate School Of Bioscience And Biotechnology Tokyo Institute Of Tech
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Shiota Masatoshi
Department Of Health And Sports Science Faculty Of Education Yamaguchi University
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