The 3 1 proportion between cases and controls has been selected only on the base of the main "typology" of the people who require a clinical treatment in our Institute: "stressed" subjects are more numerous than "non-stressed" subjects.
Non-stressed subjects receiving saline (control) performed adequately during the short-term memory test, while stressed subjects receiving saline displayed impaired performance.
It has been reported that stress can cause anhedonia, a core symptom of depression, and also affect taste responses of the stressed subjects.
Investigations of oxidatively stressed subjects, e.g. HIV-infected patients or diabetics, suggest beneficial outcomes in populations with high initial levels of oxidative DNA damage.
Stressed subjects receiving saline and non-stressed subjects receiving naltrexone performed adequately during the long-term memory test; however, control subjects as well as stressed subjects receiving a high dose of naltrexone performed poorly.
Both short-term memory retrieval impairment and long-term memory improvement observed in stressed subjects may have been mediated through strong opioid system activation, since they were prevented by high dose naltrexone administration.
For each subject, the amounts of plasma, whole blood, and RBC extracted and assayed were the same, except for two stressed subjects in Study 1B.
Irwin reported NPY increased in depressed and stressed subjects, and suggested that "circulating levels of this neuropeptide serves as a tonic measure of sympathetic activity"[ 25].
However, obesity and consequently T2D might also be integrated into the latter cluster because chronic mental stress is a well-known forerunner of obesity in approximately 40% of investigated stressed subjects [ 10- 15].
Those studies typically request that stressed subjects declare their preference (e.g., which is more "beautiful"?) for either a forested landscape or the concrete world of an urban downtown.
