In order to explore the chain mediating effect of mindfulness and meaning in life between physical exercise and depression, 954 college students were investigated by physical exercise rating scale, self-rating depression questionnaire, mindfulness scale and meaning in life questionnaire. The results show that: (1) Physical exercise can significantly positively predict mindfulness and meaning in life, and significantly negatively predict depression; (2) The direct effect of physical exercise on depression of college students is not significant, but the indirect effect is significant. It can significantly predict depression of college students through the independent mediating effect of mindfulness and meaning in life, and can also significantly predict depression of college students through the chain mediating effect of mindfulness and meaning in life.

In the context of healthy China, the study of the spatial distribution characteristics of urban sports venues is not only beneficial to planning the construction of sports venues in cities, but also to the health protection of urban residents. Therefore, to promote a fair and scientific approach to constructing public fitness sites in the city and meet the needs of urban residents’ fitness activities, this study targeted public fitness sites larger than 10 m² in the main urban area of Jinan City to study spatial distribution characteristics and accessibility. We combine the traffic road network and other data and use spatial and buffer zone analyses to assess the sites from the perspective of different travel modes of urban residents. The results show that the public fitness venues in the main urban area are mainly concentrated centrally; there is no significant pattern between the construction of venue area and population. For the time range of 0–15 min, Lixia District has the highest ratio of public fitness venue service area for walking, cycling, and car travel, with 22.54%, 62.25%, and 100%, respectively, and Changqing District has the lowest. In terms of travel mode, the highest service area ratio is 62.7% for car travel, followed by 28.7% for cycling, and 7.7% for walking. It is concluded that the construction of public fitness venues in Jinan has an unbalanced layout, does not fully consider the population factor, and different modes of travel have a significant impact on accessibility. It is therefore suggested that the government should increase public fitness venue construction in the areas surrounding the main city; moreover, future planning of urban public fitness venues should fully consider the distribution characteristics of population quantity and age in each area. Finally, the main travel mode characteristics of urban residents should also be considered to promote the future scientific development of urban public fitness venue construction.

Objective. This study uses statistics to analyze the diagnostic significance of ultrasonic exploration for rotator cuff injuries. Methods. For this study, 50 patients with rotator cuff injury or shoulder impingement syndrome admitted to the hospital from September 2017 to January 2019 were selected as the targets of this discussion. The general clinical materials of the patients were retrospectively analyzed, and ultrasound was performed for them. The results of the examination and arthroscopy are compared with the final pathological results. Results. The diagnostic sensitivity of ultrasound in the diagnosis of partial rupture and complete rupture of the supraspinatus tendon was 100, and the specificity was 55.55. The diagnostic sensitivity of partial rupture and complete rupture of the subscapular tendon was 100, and the specificity was 42.8; there was no significant difference compared with the joint mirror examination, and there was no statistical significance. Conclusion. The thesis adopts ultrasound exploration for patients with rotator cuff injuries with high diagnostic sensitivity. It is a reliable and effective clinical diagnosis method, which is worthy of clinical application and promotion.

Previous studies have established a significant negative correlation between job satisfaction and occupational burnout. However, limited research has specifically focused on K-12 teachers, leaving the underlying mechanisms of this relationship insufficiently explored. To address this gap, we proposed a moderated mediation model and collected questionnaire data from 496 Chinese K-12 teachers. This study aimed to examine whether psychological capital mediates the relationship between job satisfaction and occupational burnout, and if physical exercise moderates this mediating pathway. Results indicated that higher job satisfaction was significantly associated with lower occupational burnout and higher psychological capital. Psychological capital itself demonstrated a negative correlation with occupational burnout. Crucially, psychological capital acted as a partial mediator in the job satisfaction-occupational burnout relationship. Moreover, physical exercise significantly moderated the indirect relationship between job satisfaction and burnout through psychological capital. Theoretical and practical implications of these findings are discussed.

In the context of the Healthy China initiative, studying the spatial distribution characteristics of urban sports venues will benefit sports venue planning in cities and promote the health of urban residents. Therefore, considering the main urban area of Dalian City as the study area, in this study, we investigated the spatial distribution characteristics of fitness venues and their accessibility through spatial and buffer zone analyses using data of public fitness venues, school sports venues, and the traffic road network. The conclusion is as follows: (1) In Zhongshan, Xigang, and Shahekou Districts, public fitness venues are more densely distributed in non-coastal areas. (2) Within 0–15 min, Xigang District showed the highest ratio of the public fitness venue service area (24.42%), which was followed by Shahekou (19.02%), Zhongshan (17.13%), and Ganjingzi Districts (4.82%). (3) The number of sports venues increased from 272 to 1117 when school sports venues were considered. Due to this, the service area ratio of fitness venues in all districts was increased, and the ranking was also changed. After this, Shahekou District had the highest ratio of the sports and fitness venue service area (55.65%), which was followed by Xigang (48.43%), Zhongshan (35.68%), and Ganjingzi Districts (11.91%). Therefore, solutions to introduce more school sports venues should be investigated to ensure a uniform spatial distribution of urban fitness venues. This study provides a reference to plan and develop fitness venues in cities.

Executive function is a higher-order cognitive capacity that integrates planning, organization, impulse control, and emotional regulation, thereby exerting