Have you ever thought about the effect exercising in the heat has on your body?
I love the heat… when everyone else is retreating to the indoors and air-conditioned buildings, I’m starting to come to life. And the hotter the better… or so I thought.
Tuesday, a couple of weeks ago, the weather was forecast to be 39 degrees celcius, so I advised my personal training clients to train early to avoid the midday heat. We take all the precautions we can to ensure no ill-effects from heat related illness.
But then I found myself with a bit of spare time in the middle of the day, so what do I do? I decide to go for a walk for an hour or so… congratulating myself, because I’m being sensible only going for walk and not a run!
On goes the sunscreen, light weight clothing, sunglasses, hat and 2 litre camel back filled with cold water… and off I go.

If someone (or yourself) is suffering from heat illness, follow these steps.
After an hour, I’m enjoying the heat and feeling fantastic… until I take a big shuddering breath and wonder what that’s all about. I take notice of my pounding heart and decide to turn on my heart rate monitor to see where I’m at. Now I usually walk briskly on about 110-117 beats per minute…
160 beats per minute!!!
That’s full on running heart rate… my body is working hard to cope with the heat. While in my head I felt fine, clearly I’m compromising my health. Fortunately I’m only 15 minutes from home and I stick to the shaded areas, while constantly sipping water. But when I get there and look in the mirror, my face is beetroot red – not my normal response to a walk at all!
While having a cool shower, I chastise myself… WHAT’S GOOD FOR MY CLIENTS IS GOOD FOR ME!
As we’re currently in the height of summer, here are a few tips from Sports Medicine Australia Victorian Branch to remember when considering exercising in the heat:
- Exercising in hot, humid conditions can lead to dehydration, heat illness and sometimes even heat stroke.
- Symptoms of heat illness – light-headedness, nausea, headache, confusion, not sweating, agressive or irrational behaviour – be alert for any of these signs!
- Stay hydrated – drink water before, during and after exercise.
- Take rests, preferably in the shade.
- Wear light coloured, lightweight and loose clothing that allows easy evaporation of sweat from the skin.
- Wear sunglasses, 30+ sunscreen and a hat.
- Reduce the duration and intensity of your warm up.
- Do NOT undertake strenuous activity if you have recently experienced a high temperature, infection, diarrhoea or vomiting.
- If you have a medical condition such as asthma, diabetes, a heart problem, epilepsy or obesity, are taking medication or are pregnant, you may experience difficulties exercising in the heat.
- If you are suffering from heat illness – lie down in a cool place, remove excess clothing, wet your skin or use ice packs and drink cool water. If your symptoms don’t improve seek medical assistance.
Here’s a helpful temperature guide from SunSmart:
Temperature: 31-35; Risk of Heat Illness: High-very high
Uncomfortable for most people, modify activities. Reduce intensity, take more breaks and limit duration to less than 60 minutes. Be cautious when relative humidity reaches over 50%
Temperature: 36 and above; Risk of Heat Illness: Extreme
Very stressful for most people, modify, postpone or cancel activities. Reschedule to a cooler part of the day or cooler location. Be cautious when relative humidity reaches over 30%.