Mark Burnley, an endurance physiologist at the University of Kent, investigates the biology that underpins how fast somebody can run at a variety of distances, from sprints to ultramarathons.

In recent years, manufacturers have marketed snacks and drinks that contain melatonin as “relaxation” products. However, doctors do not know if they are effective.

This blend isn't overpowering like others I've tried. I add a few drops to my diffuser 30 minutes before bed and feel myself starting to unwind almost immediately. What more could I ask for?

A thyroid disease is often a lifelong medical condition that you’ll need to manage consistently. This often involves daily medication. Your healthcare provider will monitor your treatments and adjust them over time.

A solid understanding of the physiology behind endurance training helps to trust that you are doing the right training to develop your energy pathways and lactate shuttle.

One downside is the price point — it may be out of budget for some. It also had a slight initial odor that quickly dissipated within a day or two. With a 1-year warranty and a 45-day trial period, it's worth trying if you're looking for a new pillow that adapts to your body as you move.

Advanced pain medicine procedures A medical team discusses its approach to a pain procedure before starting.

When applied before bed, Wholesome Hippy purports that this cream helps ease muscle tension and fosters a sense of calm. Plus, it's enriched with other sleep-promoting ingredients like melatonin, valerian root and chamomile, making it an ideal addition to a nighttime routine.

If you learn that a biological family member has a thyroid disease, be sure to update your provider so they can add it to your medical record. Thyroid diseases often run in families. It’s good to know your history in case you ever develop symptoms of thyroid disease.

The best option for you depends on the cause of your sleep troubles and personal preferences. To round up the best sleep aids, we consulted five experts, including physicians, mental health experts and sleep specialists, to find out what to look for.

A doctor may recommend a sedating antihistamine, but only as a short-term solution. Though they are not addictive, the body gets used to them quickly, so they can become less effective over time.

People who have trouble sleeping well regularly should see a doctor immediately. This can help them identify the best course of treatment and limit or eliminate risks of non-treatment, such as accidents on and off the road, work performance problems, and persistent fatigue.

This process’s complexity also helps explain why producing energy through aerobic glycolysis is not a quick process, compared to anaerobic glycolysis.

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