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Drinking, lack of water, suffering from heart disease, soaking in hot springs, beware of shock

Drinking, lack of water, suffering from heart disease, soaking in hot springs, beware of shock


(Hong Kong News) What is heat shock? Dr. Xiao Songhua, an honorary clinical professor of the Department of Internal Medicine of the University of Hong Kong and a specialist in cardiology, said that heat shock is similar to heat fainting. It refers to the dilation of blood vessels and a sudden drop in blood pressure in a high-temperature environment, which leads to a short-term lack of blood supply to the brain and makes people lose consciousness.

Cardiology Dr. Xiao Songhua

Blood vessel relaxation, blood pressure reduction, brain hypoxia

“Fainting usually takes a short time, and most of the parties will wake up on their own; while shock takes a long time, which may lead to hypoxia damage to the brain and a higher risk of death. Why does soaking in hot springs cause heat shock?”

He explained that whether it is hot springs, sweat steaming or sauna bathing, blood vessels on the surface of the skin relax under high temperature, and blood pressure drops, so there is a possibility of shock due to insufficient blood supply to the brain.

That being the case, aren’t hot springs, steam baths or saunas high-risk activities? Xiao Songhua checked the information and found that although there are not many deaths in hot springs or saunas, they have something in common.

1. The client is dehydrated: the body is not hydrated enough. In a high temperature place, the blood vessels relax, the blood pressure is lower, and fainting occurs

2. Alcohol effects: After drinking, the blood vessels have been relaxed, and then entering a high temperature place, the blood pressure will drop more obviously

3. History of heart disease: If you have arrhythmia or cardiovascular disease, a sudden drop in blood pressure and the failure of the heart to load will cause danger.

Is the elder a high-risk group? Xiao Songhua pointed out that the elderly are old and may have heart problems or hidden diseases. In addition, their blood vessels are relatively hard, and if there is a lack of water, when the blood vessels expand, the possibility of insufficient blood is relatively high.

Safe bathing in hot springs—soaking in hot springs makes you feel refreshed and refreshed! However, soaking in hot springs in the absence of water, the influence of alcohol, and a history of heart disease may cause heat shock; experts provide tips for everyone to enjoy the fun of hot springs.

Pay attention to your physical condition

“Are hot springs or saunas bad for ordinary people? The answer is no; on the contrary, the existing data are more beneficial.”

Xiao Songhua said that many observational studies and large-scale data meta-analysis pointed out that sauna bathing is good for heart health.

A study in Finland and the United Kingdom showed that people who had the habit of sauna bathing (sauna bathing) 1 to 2 times a week for half to 1 hour had cardiovascular accidents, sudden cardiac death (sudden cardiac death, SCD) and heart disease. The risk of vascular disease is lower than that of people who do not have this habit.

The principle is that the blood vessels relax in the sauna, the blood pressure decreases, and the heart load increases accordingly. The heartbeat needs to be accelerated, and the heart is trained in a disguised form, “close to the body’s response to exercise.”

This is also the reason why the body and mind feel comfortable after soaking in hot springs or saunas, “like after exercising”, but it is not done with muscles, but through the relaxation of the skin to do exercises.

However, he also reminded that there is no clinical experimental study to further confirm the benefits of sauna bathing. The subjects of the above-mentioned research and analysis all have long-term and regular sauna bathing habits since they were young.

It seems that its benefits cannot be achieved in a short time, and it also depends on the individual’s ability to bear it. If you have high blood pressure, will the sauna improve it?

“Of course there is, but the people in the study baked for 45 minutes at a time, and hypertensive patients may feel uncomfortable after baking for 10 minutes, so they have to stop immediately. It’s like exercising. It should be beneficial, but excessive exercise is also dangerous.”

Xiao Songhua suggested that we should pay attention to our personal physical condition and stop it in moderation.

Here are his tips for enjoying a hot spring, steam room or sauna with peace of mind.

Gradually adapt – when taking a sauna, it is recommended to start with a lower temperature to allow the body to adapt gradually, and stop immediately if there is any discomfort.

1.Patients with cardiovascular disease should consult their doctors beforehand.

2.Adequate hydration is required before and after activity. 3.Alcoholic beverages should not be consumed beforehand.

4.step by step:

Cardiovascular disease patients who have obtained the doctor’s consent to exercise, first test their physical endurance for 5 minutes; for ordinary people who are trying to exercise for the first time, the recommended time is 15 to 30 minutes.

Start with a cooler hot spring, steam room or sauna and let your body get used to it.

When soaking in hot springs, start from the feet, and slowly warm up the body and heart.

5.When you feel unwell, such as dizziness, darkened vision, rapid heartbeat, etc., you should stop activities immediately

cold water afterward or ruptured blood vessel

In addition, after soaking in hot springs or saunas, some people will shower their bodies with cold water, claiming that it can promote blood circulation. Xiao Songhua said that this has no obvious benefits, but instead tests the changes in the physiological system, because the sudden change from heat to ice will cause the blood vessels to relax suddenly. Constriction, people with lower blood vessel pressure may cause blood vessel rupture.

Hot water washes away oil, eczema skin is more dry

In addition to helping to relax, hot spring baths are also pursued by some people for “curative effect”.

Sodium bicarbonate spring is also called beauty soup. It is said that sulfur spring water can cure eczema. Is it really effective?

The hot springs are said to have skin care effects. Dr. Chen Junyan, a specialist in skin and venereal diseases, believes that it is just a feeling, because there are some substances in the hot springs that stick to the surface of the skin.

“It feels slippery, but can these substances stay on the skin surface for a long time? In addition, the body will be cleaned after soaking in the hot spring, so the effect is limited.”

Dermatology and Venereology Specialist Dr. Chen Junyan

Hot water temporarily relieves itching

As for the treatment of skin diseases, “In Western medicine, there is no great and definite evidence that hot springs have good effects on skin diseases.” Chen Junyan said.

However, many patients with skin diseases feel very comfortable when soaking in hot springs, because the common symptom of skin diseases is itching, and soaking in hot or warm water has a soothing effect, making the itching disappear temporarily.

He said that in addition, the skin surface of patients with moderate to severe atopic dermatitis (commonly known as eczema) is likely to carry Staphylococcus aureus. If the skin is damaged, the bacteria enter the skin and produce toxins, which will make the condition worse.

“There is a lot of evidence that if patients with moderate to severe eczema disinfect the skin surface and reduce Staphylococcus aureus, it will help the frequency and severity of eczema attacks, and spring water containing sulfur, salt, and high acidity will help inhibit bacterial growth. So in theory there is some help.”

However, many eczema patients get worse after soaking in hot springs, or develop dermatitis xerosis, or even abscesses.

Bacterial infection – When eczema breaks out, it is not advisable to soak in hot springs, because hot spring water may irritate skin surface wounds, and may also be infected by bacteria and viruses.

Bacterial content is high if the water is not changed

Chen Junyan explained that the skin of eczema patients lacks moisturizing factors, and the skin surface is prone to cracks. External stimuli can directly enter the dermis, causing sensitivity. If you soak the skin with hot water above 40°C for a long time to wash away the surface oil, the skin will be drier.

In addition, if there is a wound on the surface of the skin, hot spring water containing high concentrations of salt or minerals may directly enter the dermis, causing irritative dermatitis. Furthermore, a recent report revealed that there are hot spring hotels in Japan that only change the water twice a year, and the Legionella bacteria content in the spring water exceeds the standard by 3700 times.

“Some hot springs may not change the water frequently, and the bacterial content may be high.”

Chen Junyan said that even if the water is changed, bacteria, viruses, and fungi are likely to be hidden by the pool, such as Staphylococcus aureus, herpes virus, etc., which may cause infection.

He said that hot springs are not necessarily necessary to pursue curative effects. If patients with skin diseases want to enjoy hot springs, they must first pay attention to their conditions. worse.”

If the skin condition is stable, you can enjoy the fun of the hot spring by paying attention to the following tips.

1.Retire in spite of difficulties: If you feel tingling or burning sensation when soaking, you should immediately wash your body with water.

2.Enough is enough: do not soak for too long each time, and take a rest in the water for about 5 minutes.

3.Post-bubble care: Immediately after soaking in hot springs, rinse with clean water, apply to 80% to 90% dry, and apply moisturizer or ointment prescribed by the doctor to moisturize the skin.

Article by Li Xinmin “Ming Pao”



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