Immersion in Warm Water is Beneficial for Renal Function

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  • YOSHIDA Yoshihiro
    Course of Physical Therapy, School of Health Sciences, Faculty of Medicine, Kagoshima University
  • SAKAKIMA Harutoshi
    Course of Physical Therapy, School of Health Sciences, Faculty of Medicine, Kagoshima University
  • MATSUDA Fumiyo
    Course of Physical Therapy, School of Health Sciences, Faculty of Medicine, Kagoshima University
  • UENO Shun-ichi
    Course of Physical Therapy, School of Health Sciences, Faculty of Medicine, Kagoshima University
  • KAMIZONO Tomomi
    Course of Physical Therapy, School of Health Sciences, Faculty of Medicine, Kagoshima University
  • IZUMO Kimiko
    Course of Physical Therapy, School of Health Sciences, Faculty of Medicine, Kagoshima University
  • TOGOU Miyuki
    Course of Physical Therapy, School of Health Sciences, Faculty of Medicine, Kagoshima University
  • TAKAHASHI Azusa
    Course of Physical Therapy, School of Health Sciences, Faculty of Medicine, Kagoshima University

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  • 温浴の腎機能への効果

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Abstract

Renal plasma flow (RPF) and glomerular filtration rate (GFR) are decreased in patients with heat stroke. Heat stroke after prolonged exercise under high temperatures is usually associated with hypotension and dehydration, leading to decreased RPF. However, whether renal blood flow (RBF), RPF, and GFR are increased or decreased during immersion in mild warm water remains unknown.<br>Para-aminohippurate clearance (CPAH), sodium thiosulfate clearance (Cthio), and creatinine clearance (Ccr) were determined in 14 healthy men aged 19 to 27 years old (mean±SD, 22±2), 161 to 181cm (171.5±6.3) tall, and weighing 52 to 78kg (64.2±7.4) without immersion at about 25°C (room temperature) and during immersion in water at 41±0.5°C.<br>CPAH, Cthio, and RBF significantly increased during immersion compared with those without immersion (P<0.0001, P<0.03, P<0.0001, respectively). Ccr did not change (P=0.108). The filtration fraction (FF) was significantly decreased (P<0.001). Levels of plasma atrial natriuretic peptide, aldosterone, anti-diuretic hormone and renin did not significantly differ between these two conditions.<br>This investigation suggests that daily immersion at 41°C is beneficial for renal function.

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