Laughter yoga is a laughter exercise that combines yoga and breathing exercises (Pranayama). Laughter yoga decreases stress and burnout levels, depression and anxiety, salivary cortisol levels. The aim of the research is to systematically examine the studies on the effect of laughter yoga on health parameters in nurses and nursing students. Systematic review of RCTs and quasi-experimental studies. The PRISMA protocol was used as the basis for the conduct of the study. Google Scholar, Medline/PubMed, Cochrane Library, Science Direct, CINAHL Complete and OVID databases were used for study search. Inclusion criteria was based on PICOS. The quality of the studies was assessed using the Joanna Briggs Institute-Meta analysis Statistical Assessment and Review Instrument (JBI-MAStARI). 10 studies were included in the systematic review after those excluded due to reasons not meeting the inclusion criteria. It was determined that the sample size was 50 or more in 80% of the studies. It was determined that the maximum number of laughter yoga sessions was 24 and at least 5 sessions. It has been observed that stress levels evaluated with different measurement tools decrease with the effect of laughter yoga in four studies. In three studies it was found that the level of burnout decreased after laughter yoga. In two studies in which salivary cortisol levels were evaluated also showed that laughter yoga reduced cortisol levels. It was concluded that stress and burnout levels, depression and anxiety, salivary cortisol levels decreased especially after laughter yoga. In addition, it was concluded that laughter yoga had positive effects on psychological well-being, life satisfaction, subjective happiness increase in and general health in the groups where laughter yoga was practiced.

Nurses are the first health professionals to interact with people affected by disasters. The success of this interaction depends on the outcome of the process which is affected by the disaster management knowledge and skills of the nurse. This study was conducted to examine the effect of disaster nursing course on nursing students' disaster awareness, preparedness and intervention self-efficacy perceptions. The study was conducted in X University, Faculty of Health Sciences, Department of Nursing in the fall semester of 2021-2022 in a one-group quasi-experimental study design with pre-test post-test design. The population of the study consisted of senior students (n: 60) studying in the nursing department, while the sample was not selected (n: 43). "Personal information form", "Disaster Awareness Scale", "Disaster Preparedness Scale" and " Disaster Response Self-Efficacy Scale" were used to collect the data. The research data were collected in the first week (pre-test) and the last week (post-test) of the disaster nursing elective course. While 53.5% of the participants were between 22-23 years old, 55.8% of them stated that they had experienced a real disaster. It was found that there was a statistically significant difference between the pre-test and post-test scores of the participants' pre-disaster awareness dimension, post-disaster awareness dimension and disaster awareness perception scale (p<0.05). A statistically significant difference was found between the pre-test and post-test scores of the participants from the disaster preparedness scale, disaster response self-efficacy scale (p<0.05). It was observed that the disaster nursing course positively improved nursing students' disaster awareness, disaster preparedness and disaster response self-efficacy perceptions.