Mental health problems of Army personnel seen in medical outpatient clinics in Greece

Adenosine, caffeine, and sleep-wake regulation: state of the science and perspectives

For hundreds of years, mankind has been influencing its sleep and waking state through the adenosinergic system. For ~100 years now, systematic research has been performed, first started by testing the effects of different dosages of caffeine on sleep and waking behaviour. About 70 years ago, adenosine itself entered the picture as a possible ligand of the receptors where caffeine hooks on as an antagonist to reduce sleepiness. Since the scientific demonstration that this is indeed the case, progress has been fast. Today, adenosine is widely accepted as an endogenous sleep‐regulatory substance. In this review, we discuss the current state of the science in model organisms and humans on the working mechanisms of adenosine and caffeine on sleep. We critically investigate the evidence for a direct involvement in sleep homeostatic mechanisms and whether the effects of caffeine on sleep differ between acute intake and chronic consumption. In addition, we review the more recent evidence that adenosine levels may also influence the functioning of the circadian clock and address the question of whether sleep homeostasis and the circadian clock may interact through adenosinergic signalling. In the final section, we discuss the perspectives of possible clinical applications of the accumulated knowledge over the last century that may improve sleep‐related disorders. We conclude our review by highlighting some open questions that need to be answered, to better understand how adenosine and caffeine exactly regulate and influence sleep.

Psychological morbidity, quality of life, and self-rated health in the military personnel

OBJECTIVE

The mental health of military personnel varies as a result of different cultural, political, and administrative factors. The purpose of this study was to evaluate the psychological morbidity and quality of life of military personnel in Taiwan.

MATERIALS AND METHODS

This cross-sectional study utilized the World Health Organization Quality of Life Instrument, brief version, Taiwan version, the General Health Questionnaire-12, Chinese version, and the Visual Analog Scale (VAS) in several military units.

RESULTS

More than half of the subjects (55.3%) identified themselves as mentally unhealthy on the General Health Questionnaire-12, Chinese version; however, a higher percentage of officers perceived themselves as healthy (57.4%) than did noncommissioned officers (38.5%) or enlisted men (42.2%). Officers also had higher total quality of life (QOL) scores (83.98) than did enlisted men (79.67). Scores on the VAS also varied: officers: 72.5; noncommissioned officers: 67.7; and enlisted men: 66.3. The VAS and QOL were positively correlated with perceived mental health among these military personnel.

CONCLUSION

Our subjects had higher rates of perceiving themselves as mentally unhealthy compared to the general population. Those of higher rank perceived themselves as having better mental health and QOL. Improving mental health could result in a better QOL in the military. The VAS may be a useful tool for the rapid screening of self-reported mental health, which may be suitable in cases of stressful missions, such as in disaster rescue; however, more studies are needed to determine the optimal cut-off point of this measurement tool.