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Öğe The effect of individual biological rhythms on dry eye(TAYLOR & FRANCIS LTD, 2019) Yener, Halil Ibrahim.; Selvi, Yavuz.; Tekdemir, Rukiye.This study aims to assess whether an individual's chronotype (i.e. morningness versus eveningness) has an impact on tear film. Eighty-six dry eye patients not having any underlying systemic or metabolic diseases and either a morning or evening chronotype were included in the study. Tear film break-up time (BUT) and Schirmer tests are common objective tests that are used to diagnose the eye dryness. Using multivariate analysis of covariance (MANCOVA), we investigated the interaction effect of chronotype x sex on insomnia, Schirmer (mm) and BUT (sec) measurements after adjusting for age. We found that the participants who were more prone to evening chronotype characteristics reported to have more severe dry eye signs which monitor with the aid of the Schirmer and tear film break-up time test. In addition, those with higher scores in insomnia severity index had lower Schirmer test and tear film break-up time scores. These findings suggest that chronobiological factors may play a crucial role in the dry eye symptom severity.Öğe The effects of individual circadian rhythm differences on insomnia, impulsivity, and food addiction(SPRINGER, 2019) Kandeger, Ali.; Selvi, Yavuz.; Tanyer, Deniz Kocoglu.Individuals can generally be divided into morning, neither and evening types according to behavioral, psychological, and biological variables including appetite levels, usual meal times, sleep times, and melatonin secretion. These factors together identify a person as being part of a certain chronotype, i.e., as feeling more efficient either in the morning (morning type) or later in the day (evening type). Food addiction is defined as addictive behavior toward palatable foods and is thought to be one of the underlying risk factors for obesity. Our aim in this study was to investigate the relationship between circadian rhythm differences and food addiction via insomnia and impulsivity in university students. Participants were 1323 university students, filled out a package of psychological tools, including the Morningness-Eveningness Questionnaire, Insomnia Severity Index, Barratt Impulsiveness Scale Short Form, and Yale Food Addiction Scale. Logistic regression analysis was used to investigate direct relation of food addiction with insomnia, impulsivity and obesity, and mediation regression analysis was used to investigate the indirect effect of circadian rhythm differences on food addiction. Our findings indicated that evening types were more prone to insomnia and impulsivity, and also insomnia and impulsivity significantly contributed to the variance of food addiction. Although there was no significant linear relationship between circadian rhythm differences and food addiction, evening-type circadian preferences were indirectly associated with higher food addiction scores mediated by insomnia and impulsivity. The most remarkable result of our work was that circadian rhythm differences seem to indirectly effect on food addiction through elevated insomnia and impulsivity. Level V, descriptive cross-sectional survey.Öğe The relationship between chronotype, sleep disturbance, severity of fibromyalgia, and quality of life in patients with fibromyalgia(TAYLOR & FRANCIS INC, 2020) Türkoğlu, Gözde.; Selvi, Yavuz.Patients with fibromyalgia (FM) report high levels of sleep disturbance and chronic diffuse musculoskeletal pain. These patients experience diminished quality of life (QoL) due to pain and other comorbidities. Chronotype preferences have been suggested as a potential factor connecting increased severity of FM, sleep disturbances, and poor overall QoL. The present study is the first study examining the possible association between chronotype preferences, sleep disturbance, severity of FM, and QoL in patients with FM. One hundred drug-free patients diagnosed with FM participated in this cross-sectional study. Of them, 79 (79%) were females and 21 (21%) were males. The mean age was 41.65 +/- 9.17 years (range: 21-62 years). The severity of FM symptoms, chronotype preferences, and QoL was evaluated using the Fibromyalgia Impact Questionnaire (FIQ), Morningness-Eveningness Questionnaire (MEQ), and World Health Organization Questionnaire on Quality of Life: Short Form (WHOQOL-BREF). The participants' anxiety/depressive symptoms and sleep problems were assessed using the Hospital Anxiety and Depression Scale (HADS) and Pittsburgh Sleep Quality Index (PSQI). The participants were classified according to their MEQ scores as evening type (score: 16-41), neither type (score: 42-58), and morning type (score: 59-86). It was found that there were significant differences in the FIQ score between the three groups (p < .001). It was determined that the total PSQI score was significantly higher in the evening type than the other two types (p < .05). It was found that there were significant differences in the general health, physical health, psychological, and environmental domain scores of the WHOQOL-BREF between the three groups (p < .05). It was detected that there were significant correlations between MEQ scores, WHOQOL-BREF subscale scores, FIQ scores, HADS-A and HADS-D scores, and PSQI scores. According to hierarchical regression analysis, eveningness preference explained an additional 21.9% of the variation in FM severity, thereby causing a statistically significant change in R-squared. Our results indicated that eveningness preference was directly related to increased FM symptom severity and poorer QoL. Based on these findings, neglecting to take chronotype preference into account may not result in optimal response to standard treatment for some patients with FM.Öğe The relationship of consumers' compulsive buying behavior with biological rhythm, impulsivity, and fear of missing out(TAYLOR & FRANCIS LTD, 2019) Aydin, Duygu.; Selvi, Yavuz.; Kandeger, Ali.; Boysan, MuratIn this study, we aimed to investigate the relationship between compulsive buying (CB), biological rhythm, impulsivity, and fear of missing out (FoMO). The data in the research was collected from 493 university students using a package of psychological tools including the personal questionnaire, the Compulsive Buying Scale (CBS), Barratt Impulsiveness Scale (BIS-11), Fear of Missing Out Scale (FoMOs), Morningness-Eveningness Questionnaire (MEQ), Sleep Hygiene Index (SHI), and Depression Anxiety Stress Scale-21 (DASS-21). One-way analysis of variance was used to investigate the differences in scales scores across chronotypes, and hierarchical regression analysis to understand the relationships of compulsive buying scores with socio-demographic characteristics and scales scores. Morning-typeindividuals reported lower scores on the CBS, impulsivity, FoMOs, anxiety, and stress than evening-types or neither-types. According to the hierarchical regression analyses, compulsive buyers reported significantly greater levels of impulsivity, depression, anxiety, and fear of missing out. The results showed that evening-type individuals were more likely to compulsive buying behaviors, impulsivity, and FoMO. In conclusion, this study revealed pioneering findings in terms of CB-related factors. It also showed the relationship between consumers' compulsive buying behavior, and FoMO and the effect of circadian preferences in biological rhythms on this relationship.
