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Home NEWS Science News Health

Exercise may have different effects in the morning and evening

Bioengineer by Bioengineer
June 13, 2019
in Health
Reading Time: 3 mins read
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Credit: University of Copenhagen, Faculty of Health and Medical Sciences.

Researchers from the University of Copenhagen have learned that the effect of exercise may differ depending on the time of day it is performed. In mice they demonstrate that exercise in the morning results in an increased metabolic response in skeletal muscle, while exercise later in the day increases energy expenditure for an extended period of time.

We probably all know how important a healthy circadian rhythm is. Too little sleep can have severe health consequences. But researchers are still making new discoveries confirming that the body’s circadian clock affects our health.

Now, researchers from University of Copenhagen – in collaboration with researchers from University of California, Irvine – have learned that the effect of exercise may differ depending on the time of day it is performed. Studies in mice reveal that the effect of exercise performed in the beginning of the mouse’ dark/active phase, corresponding to our morning, differs from the effect of exercise performed in the beginning of the light/resting phase, corresponding to our evening.

‘There appears to be rather significant differences between the effect of exercise performed in the morning and evening, and these differences are probably controlled by the body’s circadian clock. Morning exercise initiates gene programs in the muscle cells, making them more effective and better capable of metabolising sugar and fat. Evening exercise, on the other hand, increases whole body energy expenditure for an extended period of time’, says one of the researchers behind the study, Associate Professor Jonas Thue Treebak from the Novo Nordisk Foundation Center for Basic Metabolic Research.

Morning Exercise Is Not Necessarily Better than Evening Exercise

The researchers have measured a number of effects in the muscle cells, including the transcriptional response and effects on the metabolites. The results show that responses are far stronger in both areas following exercise in the morning and that this is likely to be controlled by a central mechanism involving the protein HIF1-alfa, which directly regulates the body’s circadian clock.

Morning exercise appears to increase the ability of muscle cells to metabolise sugar and fat, and this type of effect interests the researchers in relation to people with severe overweight and type 2 diabetes.

On the other hand, the results also show that exercise in the evening increases energy expenditure in the hours after exercise. Therefore, the researchers cannot necessarily conclude that exercise in the morning is better than exercise in the evening, Jonas Thue Treebak stresses.

‘On this basis we cannot say for certain which is best, exercise in the morning or exercise in the evening. At this point, we can only conclude that the effects of the two appear to differ, and we certainly have to do more work to determine the potential mechanisms for the beneficial effects of exercise training performed at these two time-points. We are eager to extend these studies to humans to identify if timed exercise can be used as a treatment strategy for people with metabolic diseases’, he explains.

###

Media Contact
Mathias Traczyk
[email protected]

Original Source

https://healthsciences.ku.dk/newsfaculty-news/2019/06/exercise-may-have-different-effects-in-the-morning-and-evening/

Related Journal Article

http://dx.doi.org/10.1016/j.cmet.2019.03.013

Tags: BehaviorCircadian RhythmDiabetesDiet/Body WeightExerciseMedicine/HealthMetabolism/Metabolic Diseases
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