Why is physical activity more tiring in heat and humidity?

It is because of thermodynamic imbalance. During physical activity, our metabolism is high and thus we burn more calories. This leads to large increase in body temperature and creation of body wastes, and the cooling mechanisms in our body starts to regulate the body temperature by more perspiration. read more

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The Heat Is On: Physical Effects of Humidity Humidity causes all kinds of unwanted physical effects on the body. From frizzy hair to dilated blood vessels, it’s important to protect yourself when the weather gets warm and moisture levels rise. read more