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Exercise-induced endocannabinoid signaling is modulated by intensity.
David A Raichlen1, Adam D Foster, Alexandre Seillier
1School of Anthropology, University of Arizona, Tucson, AZ 85721, USA. raichlen@email.arizona.edu
European Journal of Applied Physiology
|September 20, 2012
Summary
Exercise intensity influences endocannabinoid (eCB) levels. Moderate exercise significantly alters circulating eCBs, suggesting a link between eCBs, mood, and exercise intensity.
Area of Science:
- Neurobiology
- Exercise Physiology
- Endocannabinoid System Research
Background:
- Endocannabinoids (eCBs) are key neurotransmitters in reward pathways.
- Exercise is known to activate the eCB system, potentially improving mood.
- Psychological effects of exercise are intensity-dependent, but the molecular basis is unclear.
Purpose of the Study:
- To investigate the relationship between aerobic exercise intensity and circulating endocannabinoid levels in human runners.
- To determine if endocannabinoid system activation during exercise is intensity-dependent.
Main Methods:
- Recreationally fit runners performed aerobic exercise on a treadmill at four different intensities.
- Circulating endocannabinoid levels were measured following exercise.
- Statistical analysis was used to assess the impact of exercise intensity.
Main Results:
- Endocannabinoid signaling was found to be intensity-dependent.
- Significant changes in circulating eCBs were observed only at moderate exercise intensities.
- Very high and very low exercise intensities did not significantly alter circulating eCB levels.
Conclusions:
- Exercise-induced changes in endocannabinoid levels are contingent on exercise intensity.
- Results support the hypothesis that eCB activity mediates the neurobiological effects of exercise.
- Future research on exercise and eCBs must consider exercise intensity as a critical factor.
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