Final answer:
Small molecules called Endocannabinoids are released by the body during physical exertion; they promote feelings of euphoria and reduce pain, and are linked to the 'runner's high'. Endorphins also play a role in modulating pain and may lead to exercise addiction due to downregulation after regular intense exercise.
Step-by-step explanation:
Small molecules produced by the body during physical exertion are called Endocannabinoids. These molecules are released during activities such as exercise, excitement, and sex, leading to feelings of well-being and euphoria, and are also involved in reducing pain.
Endorphins play a significant role in modulating pain and are often associated with the 'runner's high,' a state of euphoria that can follow intense exercise. However, studies suggest that it's actually endocannabinoids that are primarily responsible for this phenomenon. Regular intense exercise may result in the brain's downregulation of endorphin production during rest to maintain homeostasis. This implies that individuals may need to exercise more intensely or frequently to achieve the same level of euphoria or pain relief, which could lead to exercise addiction.
It is important to note that while natural endocannabinoids and endorphins can induce euphoria, the recreational use of euphoriants like MDMA, amphetamines, or opioids is considered unethical in sports and can lead to substance dependence and addiction.
During physical exertion, small molecules produced by the body are called endocannabinoids. These molecules play a role in reducing pain, producing a feeling of well-being, and promoting euphoria. Endocannabinoid production can be triggered by vigorous aerobic exercise, leading to the phenomenon known as a 'runner's high.'