Warmer temperatures, coupled with intense ultraviolet (UV) radiation from the sun on cloudless days, could well make the country feel like it is in an inferno. In this article, we talk about the risks of this weather, and how we can beat the extreme heat.
Risks and how it affects our bodies
Heatstroke
The most serious heat illness that can be fatal is a Heatstroke. It occurs when the body can no longer control its core temperature, which can spike to 40 deg C or higher.
Headaches
Headaches can be caused by the sun’s glare and heat exhaustion. As dehydration narrows blood vessels and shrink tissues in the brain and elsewhere, the brain shrinks and pulls away from the skull, causing a headache.
Prolonged heat triggers the body to lose the heat by sweating and dilating blood vessels in the skin. This can sometimes cause a fall in blood pressure and lead to headaches as well.
Heat Cramps
Painful muscle spasms usually occur during physical exertion in hot weather. The loss of fluids and salts contributes to the cramps, with the calves, arms and abdomen most affected.
Skin Damage
- Short-term exposure to intense UV rays can lead to sunburn, while long-term exposure raises the risk of skin cancer.
- While the UV index can hit extreme levels on a hot day with less cloud cover, it is not linked to heat stress. UV levels can be just as high on a cool day with a clear sky.
Heat rash and eczema
- In high humidity with moisture in the air, it is hard for sweat to evaporate.
- Heat rash is due to sweat being trapped in the skin because of blocked or inflamed sweat ducts. It appears as small blisters and inflamed lumps.
- Eczema flares up when excessive sweating further irritates the skin.
Kidney Failure
- Prolonged sweating causes fluids in the body to deplete, leading to severe dehydration.
- Blood volume falls, putting strain on the kidneys and eventually causing renal failure.
- Long-term exposure to heat stress and chronic dehydration may cause chronic kidney disease. This has been linked to agricultural labourers and outdoor workers in Latin America and India, for instance, as their kidney disease was not caused by known reasons such as diabetes and hypertension.
Reduced Fertility
- Prolonged exposure to daily average temperature exceeding 29.8 deg C can cause low sperm count and concentration, based on a recent study of Singapore men under Project HeatSafe, a study by the National University of Singapore.
- The men had a 46 per cent higher risk of low sperm count, and a 40 per cent increased risk of low sperm concentration. The reproductive cells were also less motile and more sluggish.
- These risks were more pronounced for men between the ages of 25 and 35, said the study.
- Heat also affects women’s ovulation cycle and egg quality.
How can we beat the heat?
Heed the advisory
- Minimise outdoor activities and take more frequent breaks under the shade.
- Keep hydrated.
- Avoid wearing multiple layers of clothing.
Drink wisely
- While hydration is vital, drinking too much can cause water intoxication, where blood sodium levels fall.
- A warm or hot drink will make you sweat more, and if the sweat does not evaporate, it will lead to overheating.
- Isotonic ice slushies work best. Studies have shown that the frosty drink is more effective in bringing down core body temperature than iced liquids, improving endurance performance.
Outdoor work precautions
- Shift heavy labour to cooler parts of the day.
- Take regular rest and water breaks in a shaded, ventilated area.
- Install an alert system for high temperatures.
- Monitor workers more vulnerable to heat injury.
Adapt to heat
- Heat acclimatisation gradually exposes foreign workers and soldiers to the hot environment, enabling them to better tolerate heat.
- Workers new to Singapore or returning from prolonged leave must be acclimatised over at least seven days.
Exercise
- Doing more aerobic exercises, such as running and cardio workouts, will improve the body’s thermal capacity.
- Such exercises will also train the heart to pump blood more efficiently.
First aid
If someone shows heat injury symptoms such as muscle cramp, nausea or disorientation:
- Call for the ambulance.
- Move the person to a shady place and try to cool him down with a wet cloth, ice pack or fan. Place the ice packs against the neck, armpits and groin. Loosen excess clothing.
- If the person is conscious, give him cold water.
Reference: StraitsTimes
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