Chronotype preferences of college students from varied altitude backgrounds in Ethiopia

The association between sleep quality and anxiety symptoms: a cross-sectional study based on Tibetan university students at high altitude in China

Background

There have been more previous studies on sleep quality and anxiety symptoms among university students in plains areas. However, fewer studies have been conducted on Tibetan university students at high altitude. Analyzing the relationship between sleep quality and anxiety symptoms due to increased altitude may provide a reference for mental health promotion and intervention for Tibetan university students in high altitude areas.

Methods

Stratified whole cluster sampling was used. The pittsburgh sleep quality index (PSQI) scale was used to investigate the sleep quality of 4,777 university students at high altitude in China. The self-rating anxiety scale (SAS) was used to investigate anxiety symptoms. The chi-square test was used to compare the detection rates of anxiety symptoms among different groups, and logistic regression analysis was used to analyze the association between sleep quality and anxiety symptoms.

Results

The prevalence of anxiety symptoms among Tibetan university students at high altitude in China was 25.7%. The detection rate of anxiety symptoms among girls (28.4%) was higher than that of boys (22.1%), and the difference was statistically significant (χ 2 = 24.634, p < 0.001). The detection rates of anxiety symptoms among university students with sleep quality of "Good," "Medium" and "Poor" were 1.8, 4.8 and 39.2%, respectively, and the differences were statistically significant (χ 2 = 779.759, p < 0.001). Logistic regression analysis after adjusting for relevant covariates showed that the risk of anxiety symptoms was higher in the "Medium" (OR:3.479, 95%CI:1.946 ~ 6.221) and "Poor" (OR:44.817, 95%CI:29.175 ~ 68.847) groups, compared with the "Good" group. The same trend was observed in both men and women at the university level.

Conclusion

There is a close relationship between sleep quality and the occurrence of anxiety symptoms among Tibetan university students at high altitude in China. Improving sleep quality may have a positive effect on reducing the occurrence of anxiety symptoms among Tibetan university students at high altitude.

Circadian preference and physical and cognitive performance in adolescence: A scoping review

Adolescence is a crucial period of development which coincides with changes in circadian rhythmicity. This may augment the impact of circadian preference on performance in this group. We aimed to scope the literature available on chronotypes and their effect on physical and mental aspects of performance in adolescents. Studies were identified by systematically searching bibliographical databases and grey literature. The Morningness-Eveningness Questionnaire was the most frequently reported tool for circadian preference assessment. Academic achievement was the most prevailing outcome, with evidence suggesting that morning type adolescents tend to outperform evening types, yet the results vary depending on multiple factors. Performance in tests of intelligence and executive functions was generally better at optimal times of the day (synchrony effect). Physical performance was examined in 8 studies, with very heterogeneous outcomes. Although the associations between circadian preference and performance in adolescents are evident in some areas, there are many factors that may be involved in the relationship and require further investigation. This review highlights the assessment of physical performance in relation to chronotypes, the multidimensional assessment of circadian preference, and the need for longitudinal studies as priorities for further research.Protocol: OSF Registration - Public registration, DOI: 10.17605/OSF.IO/UCA3Z.

Effects of altitude on chronotype orientations in relation to cardiorespiratory and hematological quantities of college students in Ethiopia

BACKGROUND

The mechanism by which Ethiopians adapt to altitude is quite unique compared to other Highlanders with respect to increased oxygen saturation of hemoglobin. Although the effects of altitude on cardiorespiratory and hematological quantities on athletics performances are well known, but there is little information about its underlying effect on chronotype orientations.

METHODS

In this cross-sectional study 60 male college students with mean age 20±1.3 years from high and low altitude regions living in a tropical setting in Ethiopia were included. The participants' chronotype was determined using the self-administered Horne and Ostberg Morningness-Eveningness Questionnaires (MEQ). Measurements and estimations of hematological and cardiorespiratory parameters were performed from 7:00-9:00 AM, East African time zone, in order to minimize any variations that might occur in the course of the day. A multivariate binary logistic regression model was fitted to analyze the underlying chronotype predictors.

RESULTS

28 (93.9%) of participants from high altitude were mainly intermediate type (I-type) dominant with (MEQ = 42-58). While, 16 (55.2%) of participants from low altitudes were morning type (M-type) dominant chronotype with (MEQ = 59-69). Our main finding confirmed that altitude is an independent predictor of chronotype orientations of the participants (p<0.015). Thus, the results of the multivariate analysis seem to indicate that, participants from low and high altitudes may be uniquely oriented towards either M-type or I-type chronotype respectively (adjusted odds ratio [AOR] 4.772, 95% CI = 3.748-4618458). However, no significant difference on cardiorespiratory and hematological quantities between I-type and M-type chronotype of students from low altitude living in the same setting was reported (p > 0.05).

CONCLUSION

Our finding, reported for the first time that, the human chronotype varies according to the altitude, with no underlying effect of cardiorespiratory and hematological quantities.