Trail Notes | Female Athlete Racing

Oh no, my period falls on race day!

Racing on

your period.

You cannot reschedule the race. But you can plan for the day, and stop fighting it on the start line.

The race date is set. Your cycle does not care. Some women notice patterns across the month, such as a higher resting heart rate, feeling warmer, or a more sensitive gut, but these vary a lot from person to person and from month to month. Track your own, and remember that we train the person, not the phase. None of this makes you slower.

The athletes who struggle most in long races are often the ones who let early effort signals panic them into slowing before they need to, or ignore those signals and fade badly by hour 4. Knowing what you have noticed in your own tracking helps you separate what is cycle-related from what is performance.

Trail Note  ·  01

What you may notice

Some women notice a higher resting heart rate in the days around their period. If you use heart rate zones, a pace that felt comfortable one week may read higher the next. It is the same fitness. Your own training log will show whether this happens for you.

Some women feel warmer at the same effort at certain points of the month. Research on this is mixed and individual responses vary. At trail events where conditions are warm or the weather is unpredictable, which is most of them in Australia, heat is worth planning for whatever your cycle.

Some women notice their gut is more sensitive around their period, including cramping or looser stools. For an athlete fuelling with about 60 g of carbohydrate per hour across a 10 hour event, gut tolerance is a common reason races end early, so practise your race-day fuel in training and build up gradually.

Trail Note  ·  02

Race day, whatever your cycle

Effort is your primary tool. Heart rate can read higher than effort justifies on some days, so use breathing and leg feel as well. Can you speak five words? That is your check.

Start fuelling in the first 30 to 45 minutes and keep intake regular. Smaller, more frequent portions are a good option if your gut feels sensitive. Practise this on your long runs.

Drink to thirst and include sodium where you can, rather than drinking large volumes of plain water. Over-drinking is a real risk in long events. Sports drink, broth at aid stations, or electrolyte tablets alongside water are sensible options. If you feel bloated, confused or unwell during a race, seek medical support.

If conditions are warm, plan for cooling from the start. Ice under the collar, wet sponges at aid stations, starting slightly slower than you otherwise would. Heat management matters for every runner, and you are not weaker for needing it.