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Can Workouts Affect Menstruation?

Expert answers on why working out and strength training can help with adverse side effects of your menstrual cycle.

a young woman wears athletic apparel while standing with hands on her hips looking down

Q: Since I started working out, I’ve noticed my periods are different. Could my fitness regimen be affecting my menstrual cycles? If so, what can I do to manage my strength training and cardio routine during this time?

A: Yes, your regimen could be affecting your cycles. The good news, according to Rachel Cosgrove, CSCS, author of The Female Body Breakthrough and Drop Two Sizes, is that the impact is usually a positive one.

“When my female clients start strength training, their periods become lighter and they don’t have as many PMS symptoms because their hormones are more stable.”

Long term, a new exercise routine can also help you lose fat and gain lean muscle — which in itself can alleviate PMS symptoms.

Granted, it can be particularly challenging to drag yourself to the gym when you’re menstruating, but you’ll probably do fine once you get there: Most research suggests that the phase of a woman’s monthly cycle does not influence strength or performance in high-intensity activities like sprinting.

Many women also find that strength training dispels fatigue, improves their mood and reduces cramping in the hours following a workout.

One caveat on cardio: It may be wise to avoid your longest, toughest runs or rides during the week before your period. In that phase of your cycle, body temperature rises slightly and your heart may work a little harder than normal. As a result, some women become exhausted sooner than usual — especially if the weather is hot or humid. (Discover how to align your fitness routine with the natural phases of your menstrual cycle — and why it matters — at “Cycle Syncing: Exercise Strategies for Each Phase of Your Menstrual Cycle.”)

So stick with the weights to help alleviate PMS symptoms. And go easy on the extra-long, extra-tough cardio in the week before your period.

(If you struggle with PMS, try these lifestyle changes and 10 plant-based remedies to ease premenstrual syndrome and period pain.)

Andrew Heffernan

Andrew Heffernan, CSCS, is a Certified Strength and Conditioning Specialist, Feldenkrais Practitioner, and Experience Life contributing editor. Andrew also writes regularly for Men’s Health, and has written or co-written several books, including Weight Loss After 40, 7-Minute Workouts, and The Exercise Cure.

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