Suchergebnisse

Despite ample research on the relationship between work and sleep, little is known about the relative importance of each job quality dimension for sleep quality and whether the relationship in contingent on job quantity (i.e., working hours). Drawing on a unified analytic framework of job quality and job quantity, this study aims to investigate the interactive relationship between job quality and job quantity and their impact on sleep quality using the 2015 European Working Conditions Survey. Our findings suggest that whereas working hours have a weak association with sleep quality, job quality has a more significant impact on sleep quality, with different dimensions playing varying roles. Most favorable job characteristics (e.g., low work intensity, good physical environment, high working time quality) are linked to better sleep quality. In contrast, high skill and discretion is associated with poorer sleep quality. Furthermore, the importance of most job quality indices remains even when people work shorter hours, highlighting the continued importance of job quality for well-being in the global trend of a shorter working week.

Many sea-level residents suffer from acute mountain sickness (AMS) when first visiting altitudes above 4,000 m. Exercise tolerance also decreases as altitude increases. We observed exercise capacity at sea level and under a simulated hypobaric hypoxia condition (SHHC) to explore whether the response to exercise intensity represented by physiological variables could predict AMS development in young men. Eighty young men from a military academy underwent a standard treadmill exercise test (TET) and biochemical blood test at sea level, SHHC, and 4,000-m altitude, sequentially, between December 2015 and March 2016. Exercise-related variables and 12-lead electrocardiogram parameters were obtained. Exercise intensity and AMS development were investigated. After exposure to high altitude, the count of white blood cells, alkaline phosphatase and serum albumin were increased (P < 0.05). There were no significant differences in exercise time and metabolic equivalents (METs) between SHHC and high-altitude exposures (7.05 ± 1.02 vs. 7.22 ± 0.96 min, P = 0.235; 9.62 ± 1.11 vs. 9.38 ± 1.12, P = 0.126, respectively). However, these variables were relatively higher at sea level (8.03 ± 0.24 min, P < 0.01; 10.05 ± 0.31, P < 0.01, respectively). Thus, subjects displayed an equivalent exercise tolerance upon acute exposure to high altitude and to SHHC. The trends of cardiovascular hemodynamics during exercise under the three different conditions were similar. However, both systolic blood pressure and the rate–pressure product at every TET stage were higher at high altitude and under the SHHC than at sea level. After acute exposure to high altitude, 19 (23.8%) subjects developed AMS. Multivariate logistic regression analysis showed that METs under the SHHC {odds ratio (OR) 0.355 per unit increment [95% confidence intervals (CI) 0.159−0.793], P = 0.011}, diastolic blood pressure (DBP) at rest under SHHC [OR 0.893 per mmHg (95%CI 0.805−0.991), P = 0.030], and recovery DBP 3 min after exercise at sea level [OR 1.179 per mmHg ...