4 Spring Types Indicated for Cold Sensitivity
Japan's Ministry of the Environment lists four spring types with official bathing indications for peripheral circulatory failure (cold sensitivity, poor circulation):
Form a heat-retaining salt film on the skin — known as the "heat spring" (熱の湯)
Dilate skin capillaries and improve local blood flow
Support arterial circulation and peripheral recovery
CO₂ absorbed through the skin dilates blood vessels without raising core body temperature — the "heart-friendly bath"
Onsen minerals involved in cold sensitivity
CO₂ absorbed through the skin dilates peripheral vessels and boosts blood flow — the key mineral for cold sensitivity.
Chloride ions form a salt film on the skin that sustains warmth long after the bath.
How onsen helps cold sensitivity
Cold sensitivity arises when peripheral vessels in the hands and feet constrict and blood flow stagnates. Thermal action widens the vessels and improves flow, while a chloride salt film prevents post-bath chilling. Carbon dioxide springs are especially suited because they dilate vessels without sharply raising core temperature.
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Bathing tips for cold sensitivity
- Splash water on limbs before full immersion to prevent blood pressure spikesThis preparatory step helps your body acclimate to the water temperature. Gradually warming your extremities first can prevent the shock of full immersion, which may cause sudden and dangerous spikes in blood pressure.
- Ideal temperature: 40–41°C — above 42°C stimulates the sympathetic system and can worsen cold extremitiesBathing in water that is too hot can be counterproductive for improving circulation. Temperatures above 42°C may overstimulate the sympathetic nervous system, leading to the constriction of blood vessels and potentially worsening cold hands and feet.
- CO₂ springs run at 38–40°C; soak 15–30 minutes to maximise capillary dilationCarbon dioxide springs are effective at lower temperatures because the dissolved gas enhances circulation. Soaking for 15 to 30 minutes allows ample time for the CO₂ to be absorbed through the skin, which helps to dilate peripheral blood vessels without the strain of high heat.
- Dress quickly after a chloride spring bath to preserve the heat-retaining coatingChloride springs are known as 'waters of warmth' because they leave a fine salt film on the skin. This coating acts as an insulating layer, so dressing quickly after your bath helps trap this warmth and prolong the heat-retaining benefits.
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References
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