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Senomoto Kogen Hotel

Water profile

Senomoto Kogen Hotel

Spring chemistry and what it does, with the research behind it.

湯Simple

A simple thermal spring at Senomoto — neutral in pH and lightly mineralized on paper, but the sensory row of the certificate tells a more textured story: a faintly yellow-brown, clear water carrying a whisper of hydrogen sulfide and a metallic edge on the tongue. The wellhead delivers 41.7 °C at a steady 173 L/min.

Good for

Recovery

Warmth and buoyancy lower stress markers and improve sleep; habitual bathing is linked to lower rates of depression.

fatigue, stress

Take care

Contraindications

From a certificate analyzed in 2020.

  • Active stage of any illness (especially with fever)
  • Active tuberculosis, advanced malignant tumor, severe anemia or other marked physical weakness
  • Severe heart or lung disease causing shortness of breath on slight exertion
  • Gastrointestinal bleeding, visible bleeding
  • Acute exacerbation of a chronic illness

Measured at the source

Source temperature
41.7°C
Warm
Tonicity
Hypotonic
Flow rate
173L/min
Typical
Radon
14Bq/kg
Low

On the certificate

From a certificate analyzed in 2020.

  • Chronic muscle or joint pain or stiffness (the chronic phase of rheumatoid arthritis, osteoarthritis, lower back pain, neuralgia, frozen shoulder, bruises, sprains and the like)
  • Muscle stiffness associated with motor paralysis
  • Cold sensitivity, peripheral circulation disorders
  • Reduced gastrointestinal function (heaviness, bloating)
  • Mild hypertension
  • Impaired glucose tolerance (diabetes)
  • Mild hypercholesterolemia
  • Mild asthma or emphysema
  • Hemorrhoid pain
  • Autonomic nervous system instability, stress-related symptoms (sleep disorders, depressed mood)
  • Convalescence, fatigue recovery, general health improvement
  • Spring-type indications: autonomic nervous system instability, insomnia, depressed mood

Evidence

  1. Maeda M. 温泉の医学的効果とその科学的根拠. J. Hot Spring Science 70:197–207, 2021.
  2. Takeda M et al. Hot spring bathing practices have a positive effect on mental health in Japan. Heliyon 9(9):e19631, 2023.

Educational, not medical advice. If you have a health condition, consult a physician before onsen therapy.