Recently, positive emotions such as strength, flexibility, happiness, and gratitude have been gaining attention. Methods for preventing disease and promoting health by strengthening positive emotions are gaining attention. Laughter is a prime example of a positive emotion. For example, laughter affects the autonomic nervous system. This influence activates the sympathetic nervous system, which is active during activity. It has been found that after laughter, the autonomic nervous system switches to the parasympathetic nervous system, which is dominant during relaxation. Prolonged activation of the sympathetic nervous system has a negative impact on the mind and body. Similarly, prolonged activation of the parasympathetic nervous system also has a negative impact on the mind and body. Moderate alternation is desirable. Laughter is a valuable tool for this transition.
As we age, our immune function weakens, making us more susceptible to infections. This deterioration of immune function is called “immunosenescence.” As immunosenescence progresses, abnormal cells proliferate and become cancerous. However, cancer cells develop on a daily basis, even in healthy individuals. A healthy immune system renders these cancer cells harmless. However, as immunosenescence progresses, the immune system is no longer able to suppress the proliferation of abnormal cells. As we age, these anxieties become more apparent. Recent findings offer simple ways to strengthen the immune system. Laughter and humor have been shown to improve the function of the cardiovascular and immune systems.
From a psychoneuroimmunological perspective, an experiment was conducted to examine the relationship between laughter and immune function. Fifty students were divided into two groups: one group watched a 60-minute video of a comedy popular among young people, and the other group sat and read magazines. Blood samples were taken from the students before and after the experiment to measure natural killer cell activity. Changes in natural killer cell activity were measured in the two groups. The results showed a decrease in natural killer cell activity in the group that sat and read magazines. The students who watched the comedy program showed a significant increase in natural killer cell activity. It has been scientifically proven that laughter boosts immune function. Based on this knowledge, it seems that if you make it a habit to laugh on a daily basis, you can maintain and improve your immune function. An ideal positive activity would include the four elements of “moving your body,” “using your mind,” “interacting with people,” and “laughing.”
