Isotonic: A whole industry has been created around isotonic drinks for athletes. What is true for a lot of things applies here too: Amateur athletes do just as well with diluted fruit/water mixes or water, particularly if the run is no longer than an hour. The most important thing in the heat: The body loses minerals and salts due to perspiration. To restore the balance, you can simply add a pinch of salt to your drink.
Headaches: Listen to your body! Headaches, hot and cold shivers, stomach pains or cramps send out clear alarm signals. If these occur, you should stop your run immediately, seek some shade and walk slowly.
Performance: It makes complete sense, but ambitious athletes often forget it about: Your body is less efficient than normal in higher temperatures and, for example, reacts by increasing the pulse rate. Therefore, start a bit slower, especially in the beginning, and cut back on your running schedule.
Hat: Add a breathable running hat to your outfit, especially for runs over 20 minutes. As the body releases a lot of heat through the head, you should take off the hat when running in the shade for longer periods.
Afternoons: The time of day when you shouldn’t go running during the summer is afternoons (also see ‘Ozone’ and ‘Time of day’).
Ozone: Even though every person is that little bit different in how they cope with various ambient conditions, there are certain values above which sport should generally be avoided. With ozone, this value is 360 micrograms per cubic meter (µg/m3). The general rule is: Ozone values are at their lowest in the morning, highest in the afternoon and continue to decrease again towards the evening.
Running schedule: As already mentioned, your body’s performance is different from normal when it is exposed to higher temperatures. For this reason, you should reduce your running schedule to 50% if necessary.