Increased renal tubular sodium reabsorption during exercise-induced hypervolemia in humans

Kei Nagashima, Jauchia Wu, Stavros A. Kavouras, Gary W. Mack

研究成果: Article

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We tested the hypothesis that renal tubular Na+ reabsorption increased during the first 24 h of exercise-induced plasma volume expansion. Renal function was assessed 1 day after no-exercise control (C) or intermittent cycle ergometer exercise (Ex, 85% of peak O2 uptake) for 2 h before and 3 h after saline loading (12.5 ml/kg over 30 min) in seven subjects. Ex reduced renal blood flow (p-aminohippurate clearance) compared with C (0.83 ± 0.12 vs. 1.49 ± 0.24 l/min, P < 0.05) but did not influence glomerular filtration rates (97 ± 10 ml/min, inulin clearance). Fractional tubular reabsorption of Na+ in the proximal tubules was higher in Ex than in C (P < 0.05). Saline loading decreased fractional tubular reabsorption of Na+ from 99.1 ± 0.1 to 98.7 ± 0.1% (P < 0.05) in C but not in Ex (99.3 ± 0.1 to 99.4 ± 0.1%). Saline loading reduced plasma renin activity and plasma arginine vasopressin levels in C and Ex, although the magnitude of decrease was greater in C (P < 0.05). These results indicate that, during the acute phase of exercise-induced plasma volume expansion, increased tubular Na+ reabsorption is directed primarily to the proximal tubules and is associated with a decrease in renal blood flow. In addition, saline infusion caused a smaller reduction in fluid-regulating hormones in Ex. The attenuated volume-regulatory response acts to preserve distal tubular Na+ reabsorption during saline infusion 24 h after exercise.

元の言語English
ページ(範囲)1229-1236
ページ数8
ジャーナルJournal of Applied Physiology
91
発行部数3
出版物ステータスPublished - 2001 9 12
外部発表Yes

ASJC Scopus subject areas

  • Physiology
  • Physiology (medical)

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