06/16/2025 12:45 p.m.

How can the menstrual cycle influence your sport and training and why shouldn't you ignore it?

Dr. Niels van de Roemer
Dr. Niels van de Roemer Medical Adviser

Have you ever wondered why some days you feel like a superhero when you exercise - and other days you just feel tired and heavy?

More and more studies are showing this: The female cycle not only influences your mood and energy levels, but also your physical performance. If you know your own rhythm, you can train in a more targeted, effective and healthy way. In this article, you will find out how the individual cycle phases affect your body and how you can optimise your training accordi

Stronger through cycle knowledge: When your body can do the most

One important insight right from the start: women can train more effectively if they pay attention to their cycle! A workout in the first half of the cycle is much more effective than in the second half, according to studies conducted by the Universities of Bochum and Umeå (Sweden). The scientists found that maximum strength and muscle thickness increased significantly better in the follicular phase (time before ovulation) than in the luteal phase (time after ovulation).

The Swedish researchers divided the women between the ages of 18 and 35 into three groups. One group of women exercised three times a week regardless of their cycle. The second group did this five times a week only in the first phase of their cycle. The third group also exercised five times, but only in the second half of their cycle.

  • The results were clear: the women who exercised in the first phase of their cycle gained significant muscle mass, while the other two groups did not.

Why training in the first half of the cycle is more effective

  • The reason for the different training effects is the changing hormone concentrations during the cycle.
  • In the first half of the cycle, the hormone oestradiol increases until ovulation, which acts like the body's own doping.
  • With ovulation in the middle of the cycle, the concentration of oestradiol decreases, but the level of progesterone increases.
  • Progesterone does not have an anabolic (building up) effect, but on the contrary, a rather catabolic (breaking down) effect. This explains why your training is more efficient in the first half of the cycle than in the second.
Get to know your cycle

How can you better align your training with your cycle?

To be able to better adapt your training to your cycle, it is helpful to know the different phases of your cycle and how they affect your body.

A cycle computer such as Daysy or Lady-Comp can help you with this: It shows you when you are ovulating and which phase of your cycle you are in.

This allows you to plan when intensive workouts are particularly effective, for example in the first half of your cycle, and when it makes sense to give your body more rest. By training in harmony with your natural rhythm, you can increase your well-being and achieve more sustainable training success.

FAQs

Should I exercise during my period?

Yes! Even though many women prefer to take it easy during this time, moderate exercise can help to alleviate typical symptoms such as muscle cramps and pain. Exercise can also improve your mood.

Can too much sport affect my fertility?

Yes, especially if you exercise to exhaustion every day. Studies show that intensive training can have a negative impact on fertility. If you are trying to conceive, moderate exercise with sufficient recovery days makes more sense.

Should I give up sport if I want to have children?

No, quite the opposite. Too little exercise can also reduce your chances of getting pregnant. The important thing is to find the right balance: listen to your body, pay attention to signs such as long cycles or the absence of periods, and allow yourself recovery days.

Meet the family

Track your cycle and get to know your body even better.

Sung, E. et al. Effects of follicular versus luteal phase-based strength training in young women. (2014). doi:10.1186/2193-1801-3-668

Frisén, L. W. Mood and Oxytocin Blood Levels in Physically Active Women with and without Oral Contraceptive Use in Relation to Seasonal Daylight Variation. Int. J. Sport. Exerc. Med. 3, (2017).

Dehnavi, Z. M., Jafarnejad, F. & Kamali, Z. The Effect of aerobic exercise on primary dysmenorrhea: A clinical trial study. J. Educ. Health Promot. 7, 3 (2018).

Hakimi, O. & Cameron, L.-C. Effect of Exercise on Ovulation: A Systematic Review. Sport. Med. 47, 1555–1567 (2017).

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