How does exercise help prepare your body for labour?

If you are pregnant I am sure many people have asked you  what your plans are for your upcoming birth.  There are lots of things you can do to help prepare yourself for the big day, and we hope that one of them includes a prenatal fitness program.  There is lots of research available that supports regular exercise as a key factor in a healthy pregnancy, including an increase in energy and better adaptations to the physical demands that pregnancy brings. 

I think most of us are familiar with some of the benefits exercise has on pregnancy, but have you ever considered how exercise impacts your hormones in labour?  Maybe not, so today I thought I would share this knowledge with you!  One of the greatest advantages an exercising mother has to a non-exercising counterpart is an increase in her endorphin levels during labour.

As a Lamaze Childbirth Educator I teach families all about the normal physiologic response to birth, and we spend a lot of time learning about the four major hormones that drive labour, birth and early postpartum, especially breastfeeding. The role of our hormones in labour is fascinating to me and so I thought I would briefly explain the role of all 4 of these wonderful hormones to you!  The 4 major hormones are Oxytocin, Beta-Endorphins, Cathecholamines (Stress Hormones) and Prolactin.

The main role of Oxytocin in labour is to stimulate the uterus to contract.  When birth is undisturbed and a woman is receiving lots of emotional and physical support and can move around freely she releases lots of this helpful hormone.  As a result she typically experiences a very effective labour.  Pregnant women who exercise regularly are able to meet the physical demands of labour.  Leg strength and endurance are key!

Catecholamines (Stress Hormones) play an important role in labor too.  It's main function is to prepare and stimulate the fetal lungs for breathing immediately after birth.  However, if a mom is feeling overly stressed in the early part of labour, this self protecting hormone can slow things right down.  This is why we emphasize a lot of relaxation strategies in labour- like slow breathing, visualization and partner support.

Prolactin has been described by Sarah Buckley as the Mothering Hormone and is a huge player during late pregnancy and the post partum period.   This hormone is critical in establishing breastfeeding, but it also helps mamas and babies bond together.  Prolactin also helps a new mother establish a temperament for the monotony of motherhood. (Eat, sleep, poop, repeat.  Not necessarily the mama, but certainly the baby!)

And the last hormone is one of my personal favourites, Beta-Endorphins!  These are our bodies natural pain relievers.  During labour we release this hormone in response to an increase of oxytocin. The result is a transcending experience that helps a laboring woman better manage the discomfort and pain often associated with childbirth.   Research has shown that women who exercise regularly have higher levels of endorphins when they go into labour compared to women who do not exercise (Varrassi, Bazzano, & Edwards, 1989).  So what does this mean for you?  Less pain!  Sounds good to me :)

So if you are pregnant and would like to experience less discomfort in labour, then I hope you consider starting a prenatal exercise program! 

Here's a brief clip of me talking about some other benefits regular exercise has on labour!









Sources:
Healthy Birth Practice #1: Let Labour Begin on it's own , Debby Amis Journal of Perinatal Education (Fall 2014, Volume 23, Number 4
Ecstatic Birth: The hormonal blueprint of labour. Sarah J Buckley Mothering Magazine March-April 2002 Lamaze International Study Guide