Although the thought of venturing into cold water may seem daunting at first, there is fascinating science that suggests this cooling experience offers significant benefits for your mood and cognitive function. With the ability to set up cold baths right in your backyard, there is no longer any need to visit the local stream or river to indulge in the experience.
In this post, we'll look at the science behind cold exposure, its effects on your mood and cognitive function, and the interesting connection between the gut microbiome and the brain, known as the gut-brain axis.
Effects of cold exposure on your mood:
Let's start with the immediate effects of cold exposure on your mood. When you expose yourself to cold water, your body responds by releasing endorphins - those natural feel-good chemicals that can instantly improve your mood. Many cold water enthusiasts report feeling more alert, positive and energetic after a cold bath. But the science goes further.
Norepinephrine, a neurotransmitter linked to focus, attention and mood, plays a key role in the mood-boosting effects of cold exposure. When you expose your body to cold, there is a robust release of norepinephrine into your bloodstream and brain. Low levels of norepinephrine are linked to inattention, decreased concentration, low energy and poor mood. So it's not surprising that cold exposure can improve your mental state through this norepinephrine boost.
Cold exposure and cognitive function:
Beyond the effects on your mood, cold exposure also appears to have a positive impact on your cognitive function. The increased blood flow to your brain and the release of norepinephrine can improve mental clarity and focus. Some studies even suggest that regular cold exposure can reduce depression and protect against neurodegenerative diseases.
The gut-brain axis and the microbiome:
Now let's explore the fascinating connection between cold exposure, the gut microbiome, and the gut-brain axis. Your microbiome is made up of the trillions of microorganisms that live in your body and on your skin. Recent studies, mostly conducted in mice, suggest that cold exposure can alter the composition and activity of the gut microbiome, which in turn can have several beneficial effects.
When mice are exposed to cold, their gut microbiota changes to support processes such as thermogenesis (heat production in the body). This change involves increased intake of carbohydrates and lipoprotein-derived triglycerides. Interestingly, mice without a healthy gut microbiome show impaired thermogenesis and reduced insulin sensitivity.
The gut-brain axis is a communication system between the gut and the brain that includes hormonal, neural, and immune pathways. The gut is sometimes called the "second brain" because it produces neurotransmitters like serotonin that affect your mood and communicate with your brain via the vagus nerve.
Effects of cold exposure on the microbiome:
The exact mechanisms of how cold exposure affects your gut microbiome are still being studied. However, it is clear that a connection exists. Stress responses triggered by cold exposure can lead to changes in gut bacteria, ultimately affecting the gut-brain axis. Although more research is needed to fully understand this connection in humans, it is a fascinating area of research.
Conclusion:
Cold exposure, especially outdoors, offers a unique combination of natural therapy and science. The release of endorphins, increased norepinephrine levels, and potential changes in the gut microbiome contribute to improved mood and cognitive function.
Although scientific research is still ongoing, there is compelling evidence that incorporating cold baths into your routine could be a refreshing way to support your mental health. So, if you're looking for a natural and invigorating way to improve your mood and cognitive function, consider harnessing the cold of cold baths in your home, or ideally outside to reap even more health benefits from morning sunlight!