How Exercise Affects Glucose After Sleep Loss
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Sleep loss can temporarily reduce insulin sensitivity and make glucose harder to regulate. In this clip from Dr. Rhonda Patrick's conversation with Derek from More Plates More Dates, she describes the large glucose changes she observed during fragmented postpartum sleep and explains why she uses brief, intense exercise after poor sleep during travel. In a small randomized crossover study of healthy young men, one four-hour night of sleep reduced insulin sensitivity, while four 30-second all-out cycling sprints improved part of the insulin response. [1]
Contracting skeletal muscle increases glucose uptake by moving GLUT4 transporters toward the cell surface through pathways that are partly independent of insulin. This gives active muscle another way to clear glucose during and after exercise, and the effect can continue for hours after the session. Repeated interval training before or during periods of sleep restriction has also preserved some metabolic and mitochondrial responses in small studies, which supports exercise as a useful mitigation strategy when adequate sleep is temporarily unavailable. [2] [3]
Dr. Patrick's practical approach is to fit a short workout into the morning after disrupted sleep, sometimes for only 10 minutes, and make the intervals vigorous enough to create a meaningful muscular demand. The appropriate intensity depends on health, conditioning, recovery, and how sleepy a person feels. Exercise can support glucose handling after a poor night, but it works best as a temporary tool alongside the longer-term goal of restoring sufficient sleep.
This clip is excerpted, with permission, from a conversation between Dr. Rhonda Patrick and Derek from More Plates More Dates. Thank you to More Plates More Dates for allowing us to share it.
- ^ Sweeney EL; Peart DJ; Kyza I; Harkes T; Ellis JG; Walshe IH (2020). Impaired Insulin Profiles Following a Single Night of Sleep Restriction: The Impact of Acute Sprint Interval Exercise. Int J Sport Nutr Exerc Metab 30, 2.
- ^ 10.1093/jisesa/iew010
- ^ 10.3389/fphys.2017.00992
Derek: I want to ask about sleep deprivation and tactics you have adopted to reduce its acute effects on performance during travel or other situations.
Dr. Rhonda Patrick: Travel affects my sleep, depending on the time zone and when I need to perform. But there is no sleep deprivation like being a new parent.
Derek: Sleep deprivation is also relatable to people who are not traveling. How did your sleep change after becoming a parent?
Dr. Rhonda Patrick: Before becoming a mother, I got eight to nine hours. With a newborn, it went down to about five hours, and those hours were fragmented because I had to wake several times during the night.
At the time, I wore a continuous glucose monitor. I expected to learn how food, supplements, and alcohol affected glucose. I did not expect sleep deprivation to have such a large effect.
My fasting glucose reached a prediabetic range, and my post-meal glucose spikes were much larger. I ate a healthy diet, although I exercised less during the first month or two. This was my personal observation, not a controlled experiment.
When I reviewed the literature, I found studies showing that even one night of reducing sleep from eight hours to four can acutely worsen insulin sensitivity. The effect can reverse, but it is still important for people with chronic sleep disruption, including new parents, shift workers, travelers, and people under persistent stress.
I could not avoid waking to feed and comfort my child. When I was eventually able to return to high-intensity interval training, my glucose regulation moved much closer to normal even though my sleep was still fragmented.
Small controlled studies also suggest that exercise can partly reduce some glucose-regulation effects after sleep restriction. In one protocol, participants slept four hours and then performed sprint intervals the next morning.
That is why I often exercise after poor sleep during travel. Sometimes I do only 10 minutes because of time. I make the work more intense during the intervals.
Derek: Does this need to happen after every meal, or can it be one session during the morning?
Dr. Rhonda Patrick: Exercise activates GLUT4 glucose transporters in skeletal muscle. These transporters move toward the muscle-cell surface, which allows muscle to take up glucose through a pathway that does not depend entirely on insulin.
Intensity can increase the demand for rapid energy. When oxygen delivery cannot meet the immediate demand, muscle uses glycolysis to produce energy and lactate. Lactate is not only a byproduct. It can be used as fuel and act as a signaling molecule.
The exercise session does not have to occur immediately after a meal. Muscle contraction can improve glucose uptake and insulin sensitivity for hours after the session. More vigorous work can provide a strong stimulus, but it should be appropriate for the person's health and fitness.
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